Coma Berenices is an ancient asterism in the northern sky which has been defined as one of the 88 modern constellations. It is located in the fourth galactic quadrant, between Leo and Bootes, and is visible in both hemispheres. Its name means "Berenice's Hair" in Latin and refers to Queen Berenice II of Egypt, who sacrificed her long hair as a votive offering. It was introduced to Western astronomy during the third century BC by Conon of Samos and was further corroborated as a constellation by Gerardus Mercator and Tycho Brahe. Coma Berenices is the only modern constellation named for an historic figure.
|Right ascension||11h 58m 25.0885s–13h 36m 06.9433s|
|Area||386 sq. deg. (42nd)|
|Stars with planets||5|
|Stars brighter than 3.00m||0|
|Stars within 10.00 pc (32.62 ly)||1|
|Brightest star||β Com (4.26m)|
|Meteor showers||Coma Berenicids|
|Visible at latitudes between +90° and −70°.
Best visible at 21:00 (9 p.m.) during the month of May.
Three of the constellation's stars are visible to the naked eye: Alpha Comae Berenices, Beta Comae Berenices and Gamma Comae Berenices. They form a 45-degree triangle, from which Berenice's imaginary tresses, formed by the Coma Star Cluster, hang. The constellation's brightest star is Beta Comae Berenices, a 4.2-magnitude main sequence star similar to the Sun. Coma Berenices contains the North Galactic Pole and one of the richest known galaxy clusters, the Coma Cluster, part of the Coma Supercluster. Galaxy Malin 1, in the constellation, is the first known giant low-surface-brightness galaxy. Supernova SN 2005ap discovered in Coma Berenices is the brightest known, and SN 1940B was the first observed example of a type II supernova. The star FK Comae Berenices is the prototype of an eponymous class of variable stars. The constellation is the radiant of one meteor shower, Coma Berenicids, which has one of the fastest meteor speeds, up to 65 km/s (40 mps).
Coma Berenices has been recognized as an asterism since the Hellenistic period (or much earlier, according to some authors), and is the only modern constellation named for an historic figure. It was introduced to Western astronomy during the third century BC by Conon of Samos, the court astronomer of Egyptian ruler Ptolemy III Euergetes, to honour Ptolemy's consort, Berenice II. Berenice vowed to sacrifice her long hair as a votive offering if Ptolemy returned safely from battle during the Third Syrian War. Modern scholars are uncertain if Berenice made the sacrifice before or after Ptolemy's return; it was suggested that it happened after Ptolemy's return (around March–June or May 245 BC), when Conon presented the asterism jointly with scholar and poet Callimachus during a public evening ceremony. In Callimachus' poem, Aetia (composed around that time), Berenice dedicated her tresses "to all the gods". In the Latin translation of the poem by the Roman poet Catullus and in Hyginus' De astronomica, she dedicated her tresses to Aphrodite and placed them in the temple of Arsinoe II (identified after Berenice's death with Aphrodite) at Zephyrium. According to De astronomica, by the next morning the tresses had disappeared. Conon proposed that Aphrodite had placed the tresses in the sky as an acknowledgement of Berenice's sacrifice. Callimachus called the asterism plokamos Berenikēs or bostrukhon Berenikēs in Greek, translated into Latin as "Coma Berenices" by Catullus. Eratosthenes (3rd century BC) called it "Berenice's Hair" and "Ariadne's Hair", considering it part of the constellation Leo. The astronomer Geminus (1st century BC) recognized it as a distinct constellation. Astronomer Ptolemy (2nd century AD) considered it part of Leo, and called it Plokamos.
Coma Berenices became popular during the 16th century. In 1515, a set of gores by Johannes Schöner labelled the asterism Trica, "hair". In 1536 it appeared on a celestial globe by Caspar Vopel, who is credited with the asterism's designation as a constellation. That year, it also appeared on a celestial map by Petrus Apianus as "Crines Berenices". In 1551, Coma Berenices appeared on a celestial globe by Gerardus Mercator with five Latin and Greek names: Cincinnus, caesaries, πλόκαμος, Berenicis crinis and Trica. Mercator's reputation as a cartographer ensured the constellation's inclusion on Dutch sky globes beginning in 1589.
Tycho Brahe, also credited with Coma's designation as a constellation, included it in his 1602 star catalogue. Brahe recorded fourteen stars in the constellation; Johannes Hevelius increased its number to twenty-one, and John Flamsteed to forty-three. Coma Berenices also appeared in Johann Bayer's 1603 Uranometria, and a few other 17th-century celestial maps followed suit. Coma Berenices and the now-obsolete Antinous are considered the first post-Ptolemaic constellations depicted on a celestial globe. With Antinous, Coma Berenices exemplified a trend in astronomy in which globe- and map-makers continued to rely on the ancients for data. This trend ended at the turn of the 16th century with observations of the southern sky and the work of Tycho Brahe.
Before the 18th century Coma Berenices was known in English by several names, including "Berenice's Bush" and "Berenice's periwig". The earliest known English name, "Berenices haire", dates to 1601. By 1702 the constellation was known as Coma Berenices, and appears as such in the 1731 Universal Etymological English Dictionary.
Coma Berenices was known to the Akkadians as Ḫegala. In Babylonian astronomy a star, known as ḪÉ.GÁL-a-a (translated as "which is before it") or MÚL.ḪÉ.GÁL-a-a, is tentatively considered part of Coma Berenices. It was also argued that Coma Berenices appears in Egyptian Ramesside star clocks as sb3w ꜥš3w, meaning "many stars".
In Arabic astronomy Coma Berenices was known as Al-Dafira and Al-Hulba (translations of Ptolemaic Plokamos), forming the tuft of the constellation Leo and including most of the Flamsteed-designated stars (particularly 12, 13, 14, 16, 17, 18 and 21 Comae Berenices). Ulugh Beg, however, regarded Al-Dafira as consisting of two stars, 7 and 23 Comae Berenices. Presently Al-Dafira is the proper name of Beta Comae Berenices.
In Chinese astronomy, the stars making up Coma Berenices were in two areas: the Supreme Palace enclosure and the Azure Dragon of the East. Eighteen of the constellation's stars were in an area known as Lang wei (seat of the general), part of the Supreme Palace enclosure, The Chinese gave proper names to several stars in the constellation.
The North American Pawnee people depicted Coma Berenices as ten faint stars on a tanned elk-skin star map dated to at least the 17th century. In the South American Kalina mythology, the constellation was known as ombatapo (face).
The constellation was also recognized by several Polynesian peoples. The people of Tonga had four names for Coma Berenices: Fatana-lua, Fata-olunga, Fata-lalo and Kapakau-o-Tafahi. The Boorong people called the constellation Tourt-chinboiong-gherra, and saw it as a small flock of birds drinking rainwater from a puddle in the crotch of a tree. The people of the Pukapuka atoll may have called it Te Yiku-o-te-kiole, although sometimes this name is associated with Ursa Major.
Coma Berenices is bordered by Bootes to the east, Canes Venatici to the north, Leo to the west and Virgo to the south. Covering 386.5 square degrees and 0.937% of the night sky, it ranks 42nd of the 88 constellations in size, The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is 'Com'. The official constellation boundaries, as set by Eugène Delporte in 1930,[a] are defined by a polygon of 12 segments (illustrated in infobox). In the equatorial coordinate system, the right ascension coordinates of these borders lie between 11h 58m 25.09s and 13h 36m 06.94s, and the declination coordinates are between +13.30° and +33.31°. Coma Berenices is wholly visible to observers north of latitude 56°S.[b] and the constellation's midnight culmination occurs on 2 April.
Although it is not large, Coma Berenices contains one galactic supercluster, two galactic clusters, one star cluster and eight Messier objects (including several globular clusters). These objects can be seen with minimal obscuration by dust because the constellation is not in the direction of the galactic plane. Because of that, there are few open clusters (except for the Coma Berenices Cluster, which dominates the northern part of the constellation), diffuse nebulae or planetary nebulae. Coma Berenices contains the North Galactic Pole at right ascension 12h 51m 25s and declination +27° 07′ 48″ (epoch J2000.0).
The constellation's brightest star is Beta Comae Berenices (43 Comae Berenices in Flamsteed designation, occasionally known as Al-Dafira), at magnitude 4.2 and with a high proper motion. In Coma Berenices' northeastern region, it is 29.78 ± 0.05 light-years from Earth. A solar analog, it is a yellow-hued F-type main-sequence star with a spectral class of F9.5V B. Beta Comae Berenices is around 36% brighter, 15% more massive than the Sun,  and with a radius 10% larger.
The second-brightest star in Coma Berenices is the 4.3-magnitude, bluish Alpha Comae Berenices (42 Comae Berenices), with the proper name Diadem, in the southeastern part of the constellation. Despite its Alpha Bayer designation, the star is dimmer than Beta Comae Berenices. It is a double star, with the spectral classes of F5V and F6V. The star system is 58.1 ± 0.9 light-years from Earth.
Gamma Comae Berenices (15 Comae Berenices) is an orange-hued giant star with a magnitude of 4.4 and a spectral class of K1III C. In the southwestern part of the constellation, it is 170 ± 7 light-years from Earth, Estimated to be around 1.79 times as massive as the Sun, it has expanded to around 10 times its radius. It is the brightest star in the Coma Star Cluster. With Alpha Comae Berenices and Beta Comae Berenices, Gamma Comae Berenices forms a 45-degree isosceles triangle from which Berenice's imaginary tresses hang.
The star systems of Coma Berenices include binary, double and triple stars. 21 Comae Berenices (proper name Kissin) is a close binary with nearly-equal components and an orbital period of 26 years. The Coma Cluster contains at least eight spectroscopic binaries, and the constellation has seven eclipsing binaries: CC, DD, EK, RW, RZ, SS and UX Comae Berenices.
There are over thirty double stars in Coma Berenices, including 24 Comae Berenices with contrasting colors. Its primary is an orange-hued giant star with a magnitude of 5.0, 610 light-years from Earth, and its secondary is a blue-white-hued star with a magnitude of 6.6. Triple stars include 12 Comae Berenices, 17 Comae Berenices, KR Comae Berenices and Struve 1639.
Over 200 variable stars are known in Coma Berenices, although many are obscure. Alpha Comae Berenices is a possible Algol variable. FK Comae Berenices, which varies from magnitude 8.14 to 8.33 over a period of 2.4 days, is the prototype for the FK Comae Berenices class of variable stars and the star in which the "flip-flop phenomenon" was discovered. FS Comae Berenices is a semi-regular variable, a red giant with a period of about two months whose magnitude varies between 6.1 and 5.3. R Comae Berenices is a Mira variable with a maximum magnitude of almost 7. There are 123 RR Lyrae variables in the constellation, with many in the M53 galaxy. One of these stars, TU Comae Berenices, may have a binary system. The M100 galaxy contains about twenty Cepheid variables, which were observed by the Hubble Space Telescope. Coma Berenices also contains Alpha² Canum Venaticorum variables, such as 13 Comae Berenices and AI Comae Berenices.
A number of supernovae have been discovered in Coma Berenices. Four (SN 1940B, SN 1969H, SN 1987E and SN 1999gs) were in the NGC 4725 galaxy, and another four were discovered in the M99 galaxy (NGC 4254): SN 1967H, SN 1972Q, SN 1986I and SN 2014L. Five were discovered in the M100 galaxy (NGC 4321): SN 1901B, SN 1914A, SN 1959E, SN 1979C and SN 2006X. SN 1940B, discovered on 5 May 1940, was the first observed type II supernova. SN 2005ap, discovered on 3 March 2005, is the brightest known supernova to date with a peak absolute magnitude of about −22.7. Due to its great distance from Earth (4.7 billion light-years), it was not visible to the naked eye and was discovered telescopically. SN 1979C, discovered in 1979, retained its original X-ray brightness for 25 years despite fading in visible light.
Coma Berenices also contains the neutron star RBS 1223 and the pulsar PSR B1237+25. RBS 1223 is a member of the Magnificent Seven, a group of young neutron stars. In 1975, the first extra-solar source of extreme ultraviolet, the white dwarf HZ 43, was discovered in Coma Berenices. In 1995, there was a very rare outburst of the WZ Sagittae-type dwarf nova AL Comae Berenices. A June 2003 outburst from GO Comae Berenices, an SU Ursae Majoris-type dwarf nova, was photometrically observed.
Coma Star ClusterEdit
The Coma Star Cluster represents Berenice's sacrificed tresses and as a naked eye object has been known since antiquity, appearing in Ptolemy's Almagest. It doesn't have a Messier or NGC designation, but is in the Melotte catalogue of open clusters (designated Melotte 111) and is also catalogued as Collinder 256. It is a large, diffuse open cluster of about 50 stars ranging between magnitudes five and ten, including several of Coma Berenices' stars which are visible to the naked eye. The cluster is spread over a huge region (more than five degrees across) near Gamma Comae Berenices. It has such a large apparent size because it is relatively close, only 288 light-years away.
M53 (NGC 5024) is a globular cluster which was discovered independently by Johann Elert Bode in 1775 and Charles Messier in February 1777; William Herschel was the first to resolve it into stars. The magnitude-7.7 cluster is 56,000 light-years from Earth. Only 1° away is NGC 5053, a globular cluster with a sparser nucleus of stars. Its total luminosity is the equivalent of about 16,000 suns, one of the lowest luminosities of any globular cluster. It was discovered by William Herschel in 1784. NGC 4147 is a somewhat dimmer globular cluster, with a much-smaller apparent size.
The Coma Supercluster, itself part of the Coma Filament, contains the Coma and Leo Cluster of galaxies. The Coma Cluster (Abell 1656) is 230 to 300 million light-years away. It is one of the largest known clusters, with at least 10,000 galaxies (mainly elliptical, with a few spiral galaxies). Due to its distance from Earth, most of the galaxies are visible only through large telescopes. Its brightest members are NGC 4874 and NGC 4889, both with a magnitude of 13; most others are magnitude 15 or dimmer. NGC 4889 is a giant elliptical galaxy with one of the largest known black holes (21 billion solar masses), and NGC 4921 is the cluster's brightest spiral galaxy. After observing the Coma Cluster, astronomer Fritz Zwicky first postulated the existence of dark matter during the 1930s. The massive galaxy Dragonfly 44 discovered in 2015 was found to consist almost entirely of dark matter. Its mass is very similar to that of the Milky Way, but it emits only 1% of the light emitted by the Milky Way.
Coma Berenices contains the northern portion of the Virgo Cluster (also known as the Coma–Virgo Cluster), about 60 million light-years away. The portion includes five Messier galaxies. M85 (NGC 4382), considered elliptical or lenticular, is one of the cluster's brighter members at magnitude nine. M85 is interacting with the spiral galaxy NGC 4394 and the elliptical galaxy MCG-3-32-38. M88 (NGC 4501) is a multi-arm spiral galaxy seen at about 30° from edge-on. It has a highly-regular shape with well-developed, symmetrical arms. Among the first galaxies recognized as spiral, it has a supermassive black hole in its center. M91 (NGC 4548), a barred spiral galaxy with a bright, diffuse nucleus, is the faintest object in Messier's catalog at magnitude 10.2. M98 (NGC 4192), a bright, elongated spiral galaxy seen nearly edge-on, appears elliptical because of its unusual angle. The magnitude-10 galaxy has no redshift. M99 (NGC 4254) is a spiral galaxy seen face-on. Like M98 it is of magnitude-10 and has an unusually long arm on its west side. M100 (NGC 4321), a magnitude-nine spiral galaxy seen face-on, is one of the cluster's brightest. Photographs reveal a brilliant core, two prominent spiral arms, an array of secondary arms and several dust lanes.
M64 (NGC 4826) is known as the Black Eye Galaxy because of the prominent dark dust lane in front of the galaxy's bright nucleus. Also known as the Sleeping Beauty and Evil Eye galaxy, it is about 24 million light-years away. Recent studies indicate that the interstellar gas in the galaxy's outer regions rotates in the opposite direction from that in the inner regions, leading astronomers to believe that at least one satellite galaxy collided with it less than a billion years ago. All other evidence of the smaller galaxy has been assimilated. At the interface between the clockwise- and counterclockwise-rotating regions are many new nebulae and young stars.
NGC 4314 is a face-on barred spiral galaxy at a distance of 40 million light-years. It is unique for its region of intense star formation, creating a ring around its nucleus which was discovered by the Hubble Space Telescope. The galaxy's prodigious star formation began five million years ago, in a region with a diameter of 1,000 light-years. The core's structure is also unique because the galaxy has spiral arms which feed gas into the bar.
NGC 4565 is an edge-on spiral galaxy which appears superimposed on the Virgo Cluster. NGC 4565 has been nicknamed the Needle Galaxy because when seen in full, it appears as a narrow streak of light. Like many edge-on spiral galaxies, it has a prominent dust lane and a central bulge.
NGC 4676, sometimes called the Mice Galaxies, is a pair of interacting galaxies 300 million light-years from Earth. Its progenitor galaxies were spiral, and astronomers estimate that they had their closest approach about 160 million years ago. That approach triggered large regions of star formation in both galaxies, with long "tails" of dust, stars and gas. The two progenitor galaxies are predicted to interact significantly at least one more time before they merge into a larger, probably-elliptical galaxy.
HS 1216+5032 is a bright, gravitationally-lensed pair of quasars. W Comae Berenices (or ON 231), a blazar in the constellation's northwest, was originally designated a variable star and later found to be a BL Lacertae object. As of 2009, it had the most intense gamma ray spectrum of the sixty known gamma-ray blazars.
Some gamma-ray bursts occurred in Coma Berenices, particularly GRB 050509B on 9 May 2005 and GRB 080607 on 7 June 2008. GRB 050509B, which lasted only 0.03 second, became the first short burst with a detected afterglow.
The Coma Berenicids meteor shower peaks around 18 January. Despite the shower's low intensity (averaging one or two meteors per hour) its meteors are some of the fastest, with speeds up to 65 km/s (40 mps).
Since Callimachus' poem, Coma Berenices has been occasionally mentioned outside astronomy. In 1886, Spanish artist Luis Ricardo Falero created a mezzotint print personifying Coma Berenices alongside Virgo and Leo. In 1892, the Russian poet Afanasy Fet made the constellation the subject of his short poem, composed for the Countess Natalya Sollogub. Francisco Guerrero, a 20th century composer from Spain, wrote an orchestral work on the constellation in 1996. In 1999 Irish artist Alice Maher made a series of four oversize drawings, entitled Coma Berenices, of entwining black hair coils.
- Delporte had proposed standardising the constellation boundaries to the International Astronomical Union, who had agreed and gave him the lead role
- While parts of the constellation technically rise above the horizon to observers between 56°S and 77°S, stars within a few degrees of the horizon are to all intents and purposes unobservable.
- Objects of magnitude 6.5 are among the faintest visible to the unaided eye in suburban-rural transition night skies.
- "Coma Berenices, constellation boundary". The Constellations. International Astronomical Union. Retrieved 27 February 2014.
- "Coma Berenices". The American Heritage Dictionary of the English Language (5th ed.). Boston: Houghton Mifflin Harcourt. 2014.
- Pasachoff, Jay M. (2006). Stars and Planets. Boston, Massachusetts: Houghton Mifflin.
- Van Oppen de Ruiter 2016, p. 109.
- Gaius Julius Hyginus. "2.24". Astronomica.
- Barentine, John C. (2016). Uncharted Constellations: Asterisms, Single-Source and Rebrands. Springer. p. 17. ISBN 3-319-27619-0.
- Van Oppen de Ruiter, Branko F. (2016). Berenice II Euergetis: Essays in Early Hellenistic Queenship. Springer. p. 110. ISBN 1-137-49462-X.
- Garfinkle, Robert (1997). Star-Hopping: Your Visa to Viewing the Universe. Cambridge, United Kingdom: Cambridge University Press. p. 122. ISBN 0-521-59889-3.
- Dekker, Elly (2012). Illustrating the Phaenomena: Celestial Cartography in Antiquity and the Middle Ages. Oxford, United Kingdom: Oxford University Press. p. 41. ISBN 0-19-960969-1.
- Kunitzsch, Paul (2002). "Albumasariana" (PDF). Annali Istituto Universitario Orientale di Napoli. OPAR L'Orientale Open Archive. p. 4. Retrieved 6 November 2016.
- Ridpath, Ian. "Coma Berenices". Star Tales. Retrieved 11 April 2012.
- Dekker, Elly. "Caspar Vopel's Ventures in Sixteenth-Century Celestial Cartography". Atlas Coelestis. Retrieved 15 Aug 2016.
- Lankford, John (2011). History of Astronomy: An Encyclopedia. p. 165. ISBN 0-8153-0322-X.
- Allen, Richard Hinckley. "Star Names Their Lore and Meaning". LacusCurtius. Retrieved 19 July 2016.
- "Berenice". Online Etymology Dictionary. Retrieved 19 July 2016.
- Leybourn, William; Morden, Robert (1702). An Introduction to Astronomy, Geography, Navigation and Other Mathematical Sciences, Made Easie by the Description and Uses of the Coelestial and Terrestrial Globes. R. Morden. p. 30.
- Douglas B. Miller, R. Mark Shipp (1996). An Akkadian Handbook: Paradigms, Helps, Glossary, Logograms, and Sign List. Eisenbrauns. p. 53. ISBN 0-931464-86-2.
- E. Reiner, D. Pingree (1985). "Babylonian Planetary Omens. Part Two. Enūma Anu Enlil Tablets 50-51" (PDF). Undena Publications. Archived from the original (PDF) on 16 August 2016. Retrieved 10 July 2016.
- José Lull, Juan Antonio Belmonte. "In Search of Cosmic Order: Selected Essays on Egyptian Archaeoastronomy" (PDF). Instituto de Astrofísica de Canarias. p. 177.
- "The Tail Hair". Two Deserts One Sky. Retrieved 6 November 2016.
- Royal Astronomical Society (1843). Memoirs of the Royal Astronomical Society. 14–15. p. 191.
- Patrick Moore, Robin Rees (2014). Patrick Moore's Data Book of Astronomy. Cambridge University Press. p. 412. ISBN 1-139-49522-4.
- "Chinese Records of Guest Stars and Comets". Bedford Astronomy Club. 25 February 2012. Retrieved 19 November 2016.
- Ralph N. Buckstaff (1927). "Stars and Constellations of a Pawnee Sky Map". American Anthropologist. Vol. 29 no. 2. p. 282.
- Lévi-Strauss, Claude (1983). Mythologiques. University of Chicago Press. p. 232. ISBN 0-226-47487-9.
- Maud Worcester Makemson (1941). The Morning Star Rises: an account of Polynesian astronomy. Yale University Press. p. 281.
- Helaine Selin, ed. (2012). Astronomy Across Cultures: The History of Non-Western Astronomy. Springer Science & Business Media. p. 75. ISBN 94-011-4179-7.
- Slovenská akadémia vied. Kabinet orientalistiky (1999). Asian and African Studies. 8. Veda. p. 32.
- Ridpath, Ian. "Constellations: Andromeda–Indus". Star Tales. self-published. Retrieved 26 August 2015.
- Russell, Henry Norris (1922). "The New International Symbols for the Constellations". Popular Astronomy. 30: 469. Bibcode:1922PA.....30..469R.
- Ridpath, Ian. "Constellation boundaries: How the modern constellation outlines came to be". Star Tales. self-published. Retrieved 1 June 2016.
- Robert Thompson, Barbara Thompson (2007). Illustrated Guide to Astronomical Wonders: From Novice to Master Observer. O'Reilly Media, Inc. p. 184. ISBN 0-596-52685-7.
- "Волосы Вероники" (in Russian). Pushchino Radioastronomic Observatory. Retrieved 20 July 2016.
- Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Retrieved 28 August 2017.
- van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. Bibcode:2007A&A...474..653V. arXiv: . doi:10.1051/0004-6361:20078357.
- "Beta Comae Berenices". SIMBAD. Retrieved 19 November 2016.
- Boyajian, Tabetha S.; McAlister, Harold A.; van Belle, Gerard; Gies, Douglas R.; ten Brummelaar, Theo A.; von Braun, Kaspar; Farrington, Chris; Goldfinger, P. J.; O'Brien, David; Parks, J. Robert; Richardson, Noel D.; Ridgway, Stephen; Schaefer, Gail; Sturmann, Laszlo; Sturmann, Judit; Touhami, Yamina; Turner, Nils H.; White, Russel (2012). "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars". The Astrophysical Journal. 746 (1): 101. Bibcode:2012ApJ...746..101B. arXiv: . doi:10.1088/0004-637X/746/1/101.. See Table 10.
- Takeda, G.; Ford, E. B.; Sills, A.; Rasio, F. A.; Fischer, D. A.; Valenti, J. A. (2007). "Stellar parameters of nearby cool stars. II. Physical properties of ~1000 cool stars from the SPOCS catalog". Astrophysical Journal Supplement Series. 168: 297–318. Bibcode:2007ApJS..168..297T. arXiv: . doi:10.1086/509763. Note: see VizieR catalogue J/ApJS/168/297.
- "Alpha Comae Berenices". SIMBAD. Retrieved 22 November 2016.
- Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. Bibcode:2015AJ....150...88L. arXiv: . doi:10.1088/0004-6256/150/3/88.
- HD 108381, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line October 12, 2010.
- Joerg S. Schlimmer (January 1, 2014). "Discovery of Small Companions of Comae and TYC 1989-00307-1 in Constellation Coma Berenices and a Possible New Common Proper Motion Pair in the Constellation Canes Venatici" (PDF). Journal of Double Star Observations. Retrieved 25 November 2016.
- Burnham, Robert (2013). Burnham's Celestial Handbook: An Observer's Guide to the Universe Beyond the Solar System, v.2. Courier Corporation. p. 672. ISBN 0-486-31793-5.
- "Atlas of O-C Diagrams of Eclipsing Binary Stars". Mt. Suhora Astronomical Observatory. Retrieved 6 November 2016.
- "Double Stars in Coma Berenices". Eagle Creek Observatory. Retrieved 6 November 2016.
- Garfinkle 1997, pp. 127–128.
- P. Zasche, R. Uhlář (15 September 2010). "The triple system KR Comae Berenices". Astronomy & Astrophysics. Retrieved 24 November 2016.
- Tammy Plotner (24 Dec 2015). "Coma Berenices". Universe Today. Retrieved 15 Aug 2016.
- "Alert Notice 506: Alpha Com eclipse observing campaign". AAVSO. January 16, 2015. Retrieved 24 November 2016.
- Thomas Hackman, Jaan Pelt, Maarit J. Mantere, Lauri Jetsu, Heidi Korhonen, Thomas Granzer, Perttu Kajatkari, Jyri Lehtinen, Klaus G. Strassmeier (22 March 2013). "Flip-flops of FK Comae Berenices". arXiv. Retrieved 20 November 2016.
- H.J.P Arnold, Paul Doherty, Patrick Moore (1999). The Photographic Atlas of the Stars. CRC Press. p. 128. ISBN 0-7503-0654-8.
- "Coma Berenices". RR Lyrae stars: the GEOS maxima database. 11 March 2008. Retrieved 22 November 2016.
- "Messier 53". The Messier Catalog. Retrieved 24 November 2016.
- Pierre de Ponthiere, Franz-Josef Hambsch, Kenneth Menzies, Richard Sabo (10 May 2016). "TU Comae Berenices : Blazhko RR Lyrae Star in a Potential Binary System". arXiv. Retrieved 20 November 2016.
- "Messier 100". The Messier Catalog. Retrieved 24 November 2016.
- Garfinkle 1997, p. 127.
- "List of Supernovae". IAU Central Bureau for Astronomical Telegrams. Retrieved 6 November 2016.
- Albert G. Petschek, ed. (2012). Supernovae. Springer Science & Business Media. p. 60. ISBN 1-4612-3286-4.
- Robert M. Quimby, Greg Aldering, J. Craig Wheeler, Peter Höflich, Carl W. Akerlof, Eli S. Rykoff (3 September 2007). "SN 2005ap: A Most Brilliant Explosion". arXiv. Bibcode:2007ApJ...668L..99Q. arXiv: . doi:10.1086/522862. Retrieved 6 November 2016.
- "The supernova that just won't fade away". ESA. 21 July 2005. Retrieved 25 November 2016.
- Nagle, John (June 2016). "Coma Berenices" (PDF). Newsletter of the Baton Rouge Astronomical Society. Retrieved 15 Aug 2016.
- F. Haberl (4 September 2006). "The Magnificent Seven: Magnetic fields and surface temperature distributions". arXiv. Bibcode:2007Ap&SS.308..181H. arXiv: . doi:10.1007/s10509-007-9342-x. Retrieved 19 November 2016.
- "Two satellites to observe the unobservable". New Scientist (1684): 56. 30 September 1989. ISSN 0262-4079.
- Mobberley, Martin (2009). Cataclysmic Cosmic Events and How to Observe Them. Springer Science & Business Media. p. 32. ISBN 0-387-79946-X.
- Akira Imada, Taichi Kato, Makoto Uemura, Ryoko Ishioka, Thomas Krajci, Yasuo Sano, Tonny Vanmunster, Donn R.Starkey, Lewis M.Cook, Jochen Pietz, Daisaku Nogami, Bill Yeung, Kazuhiro Nakajima, Kenji Tanabe, Mitsuo Koizumi, Hiroki Taguchi, Norimi Yamada, Yuichi Nishi, Brian Martin, Ken'ichi Torii, Kenzo Kinugasa, Christopher P.Jones (17 December 2004). "The 2003 Superoutburst of an SU UMa-type Dwarf Nova, GO Comae Berenices". arXiv. Retrieved 20 November 2016.
- "HEC: The Constellations of Exoplanets". Planetary Habitability Laboratory University of Puerto Rico at Arecibo. Retrieved 24 November 2016.
- W. Lyra. Naming the extrasolar planets. INSPIRE / High-Energy Physics. p. 23.
- Stewart Moore. "A binocular star cluster for spring skies". British Astronomical Association. Retrieved 8 September 2017.
- Larry Sessions (April 6, 2016). "Coma Cluster of galaxies". EarthSky. Retrieved 6 November 2016.
- Nicholas J. McConnell (2011-12-08). "Two ten-billion-solar-mass black holes at the centres of giant elliptical galaxies" (PDF). Nature. 480: 215–218. Bibcode:2011Natur.480..215M. arXiv: . doi:10.1038/nature10636. Archived from the original (PDF) on 2011-12-06. Retrieved 2011-12-06.
- S. van den Bergh (1976-06-15). "A new classification system for galaxies". Astrophysical Journal. 206: 883–887. Bibcode:1976ApJ...206..883V. doi:10.1086/154452.
- "Scientists Discover Massive Galaxy Made of 99.99 Percent Dark Matter". Keck Observatory. 25 August 2016. Retrieved 11 December 2016.
- Crosswell, Ken (26 July 2016). "The Milky Way’s dark twin revealed". Nature News. Retrieved 30 July 2016.
- "Messier 88". The Messier Catalog. Retrieved 20 November 2016.
- "Messier 91". The Messier Catalog. Retrieved 20 November 2016.
- Burnham 2013, p. 682.
- Tammy Plotner. "Messier 64". Universe Today. Retrieved 19 November 2016.
- Wilkins, Jamie; Dunn, Robert (2006). 300 Astronomical Objects: A Visual Reference to the Universe. Buffalo, New York: Firefly Books. ISBN 978-1-55407-175-3.
- "NGC 4414: A Flocculent Spiral Galaxy". NASA. 3 April 2002. Retrieved 19 November 2016.
- "A Galactic Disc, Edge-on and Up Close". ESA/Hubble Picture of the Week. Retrieved 9 July 2012.
- "Astronomy Picture of the Day". NASA. Retrieved 18 November 2016.
- Lea M. Z. Hagen, Mark Seibert, Alex Hagen, Kristina Nyland, James D. Neill, Marie Treyer, Lisa M. Young, Jeffrey A. Rich, Barry F. Madore (7 July 2016). "On the classification of UGC 1382 as a giant low surface brightness galaxy" (PDF). arXiv. Bibcode:2016ApJ...826..210H. arXiv: . doi:10.3847/0004-637X/826/2/210. Retrieved 24 November 2016.
- "A subtle swarm". www.spacetelescope.org. Retrieved 5 December 2016.
- Wolfgang Steinicke, Richard Jakiel (2007). Galaxies and How to Observe Them. Springer Science & Business Media. p. 50. ISBN 1-84628-699-9.
- Mobberley 2009, p. 168.
- "NASA's Swift catches 500th gamma-ray burst". ScienceDaily. 25 April 2010. Retrieved 11 December 2016.
- Francis Reddy. "Gamma-Ray Burst Offers First Peek at a Young Galaxy's Star Factory". NASA. Retrieved 11 December 2016.
- "La chevelure de Berenice". British Museum. Retrieved 24 November 2016.
- "Стихотворение Фета А.А. "Графине Н. М. Соллогуб (О, Береника! Сердцем чую)"" (in Russian). Poesias.ru. Retrieved 10 January 2017.
- "Coma Berenices (1 of 4)". Sotheby's. Retrieved 24 November 2016.
|Wikimedia Commons has media related to Coma Berenices.|
- The Deep Photographic Guide to the Constellations: Coma Berenices
- Chisholm, Hugh, ed. (1911). "Coma Berenices". Encyclopædia Britannica (11th ed.). Cambridge University Press.