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1105 Fragaria (/frəˈɡɛəriə/), provisional designation 1929 AB, is an uncommon Eoan asteroid from the outer regions of the asteroid belt, approximately 37 kilometers (23 miles) in diameter. It was discovered on 1 January 1929, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[12] The asteroid was named after the flowering plant Fragaria (strawberry).[2]

1105 Fragaria
Orbital diagram of Fragaria
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date1 January 1929
MPC designation(1105) Fragaria
Named after
(flowering plant)
1929 AB · 1947 KB
1977 EU · A916 MA
A917 UH
main-belt · (outer) · Eos[3][4]
Orbital characteristics[1]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc89.13 yr (32,553 days)
Aphelion3.3288 AU
Perihelion2.6915 AU
3.0101 AU
5.22 yr (1,908 days)
0° 11m 19.32s / day
Physical characteristics
Mean diameter
27.92±3.41 km[5]
31.518±0.346 km[6]
36.95 km (derived)[3]
37.03±3.8 km[7]
38.206±0.703 km[8]
38.41±0.46 km[9]
10.88 h[10]
0.1086 (derived)[3]
Tholen = ST [1][3] · U/L[11]
B–V = 0.776±029[1]
U–B = 0.419±0.049[1]

Orbit and classificationEdit

Fragaria belongs to the Eos family (606),[3][4] the largest asteroid family of the outer asteroid belt consisting of nearly 10,000 members.[13] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,908 days; semi-major axis of 3.01 AU). Its orbit has an eccentricity of 0.11 and an inclination of 11° with respect to the ecliptic.[1]

The asteroid was first observed as 1916 MA at Simeiz Observatory in June 1916. The body's observation arc begins at Heidelberg in December 1928, three weeks prior to its official discovery observation.[12]

Physical characteristicsEdit

In the Tholen classification, Fragaria has an ambiguous spectral type, closest to an S-type and somewhat similar to the darker and uncommon T-type asteroids (ST),[1][3] while polarimetric observations characterized it as an U/L-type asteroid.[11] The overall spectral type for members of the Eos family is that of a K-type.[13]:23

Rotation periodEdit

In the 1990s, a rotational lightcurve of Fragaria was obtained from photometric observations by French and Italian astronomers at ESO's La Silla Observatory using the ESO 1-metre telescope. Lightcurve analysis gave a fragmentary rotation period of 10.88 hours with a brightness amplitude of 0.12 magnitude (U=1).[10] As of 2018, no secure period has been obtained.[3]

Diameter and albedoEdit

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Fragaria measures between 27.92 and 38.41 kilometers in diameter and its surface has an albedo between 0.1017 and 0.166.[5][6][7][8][9]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1086 and a diameter of 36.95 kilometers based on an absolute magnitude of 10.19.[3]


This minor planet was named after Fragaria, the genus of flowering plants in the rose family, commonly known as strawberries.[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 104).[2]

Reinmuth's flowersEdit

Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between (1009) and (1200). This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants).[14]


  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 1105 Fragaria (1929 AB)" (2018-01-24 last obs.). Jet Propulsion Laboratory. Retrieved 28 February 2018.
  2. ^ a b c d Schmadel, Lutz D. (2007). "(1105) Fragaria". Dictionary of Minor Planet Names – (1105) Fragaria. Springer Berlin Heidelberg. p. 94. doi:10.1007/978-3-540-29925-7_1106. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g h i "LCDB Data for (1105) Fragaria". Asteroid Lightcurve Database (LCDB). Retrieved 28 February 2018.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 28 February 2018.
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8.
  6. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68.
  7. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Archived from the original on 3 June 2016. Retrieved 28 February 2018.
  8. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  9. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 28 February 2018.
  10. ^ a b c Barucci, M. A.; di Martino, M.; Dotto, E.; Fulchignoni, M.; Rotundi, A.; Burchi, R. (June 1994). "Rotational properties of small asteroids: Photoelectric observations of 16 asteroids". Icarus. 109 (2): 267–273. Bibcode:1994Icar..109..267B. doi:10.1006/icar.1994.1092. ISSN 0019-1035. Retrieved 28 February 2018.
  11. ^ a b Belskaya, I. N.; Fornasier, S.; Tozzi, G. P.; Gil-Hutton, R.; Cellino, A.; Antonyuk, K.; et al. (March 2017). "Refining the asteroid taxonomy by polarimetric observations". Icarus. 284: 30–42. Bibcode:2017Icar..284...30B. doi:10.1016/j.icarus.2016.11.003. Retrieved 28 February 2018.
  12. ^ a b "1105 Fragaria (1929 AB)". Minor Planet Center. Retrieved 28 February 2018.
  13. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
  14. ^ Schmadel, Lutz D. (2007). "(1054) Forsytia". Dictionary of Minor Planet Names – (1054) Forsytia. Springer Berlin Heidelberg. p. 90. doi:10.1007/978-3-540-29925-7_1055. ISBN 978-3-540-00238-3.

External linksEdit