18 Camelopardalis is a yellow-white-hued star in the northern circumpolar constellation of Camelopardalis. It has an apparent visual magnitude is 6.44,[2] which makes it a challenge to view with the naked eye. Using the measured annual parallax shift of 23.02 mas, its distance can be estimated at 142 light-years. The star is moving away from the Sun with a radial velocity of +33 km/s[2] and has an annual proper motion of 0.251 arcseconds.[9]
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 32m 33.7997s[1] |
| Declination | +57° 13′ 15.855″[1] |
| Apparent magnitude (V) | 6.44[2] |
| Characteristics | |
| Spectral type | F8 V[3][2] |
| U−B color index | +0.11[4] |
| B−V color index | +0.587[2] |
| Astrometry | |
| Radial velocity (Rv) | +33.264±0.0160[2] km/s |
| Proper motion (μ) | RA: +111.231[1] mas/yr Dec.: −224.686[1] mas/yr |
| Parallax (π) | 23.0161 ± 0.0633 mas[1] |
| Distance | 141.7 ± 0.4 ly (43.4 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.234+0.076 −0.079[5] |
| Details[6] | |
| Mass | 1.201+0.015 −0.014 M☉ |
| Radius | 1.93+0.08 −0.04[1] R☉ |
| Luminosity | 4.242±0.015[1] L☉ |
| Surface gravity (log g) | 3.95±0.02 cgs |
| Temperature | 5,908±38 K |
| Metallicity [Fe/H] | −0.02±0.04 dex |
| Rotational velocity (v sin i) | 5[7] km/s |
| Age | 5.28+0.25 −0.19 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of this star matches a stellar classification of F8 V,[2] indicating this is an ordinary F-type main-sequence star. It is around 5.3 billion years old and is spinning with a projected rotational velocity of 5 km/s.[7] The star has 1.2 times the mass of the Sun,[6] 1.93 times the Sun's radius,[1] and has near solar abundances of elements.[6] The star is radiating 4.24[1] times the Sun's luminosity from its photosphere at an effective temperature of 5,908 K.[6]
References edit
- ^ a b c d e f g h i Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g Soubiran, C.; et al. (April 2013), "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release", Astronomy & Astrophysics, 552: 11, arXiv:1302.1905, Bibcode:2013A&A...552A..64S, doi:10.1051/0004-6361/201220927, S2CID 56094559, A64.
- ^ Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691.
- ^ Oja, T. (August 1991), "UBV photometry of stars whose positions are accurately known. VI", Astronomy and Astrophysics Supplement Series, 89 (2): 415–419, Bibcode:1991A&AS...89..415O.
- ^ Soubiran, C.; Girard, P. (July 2005), "Abundance trends in kinematical groups of the Milky Way's disk", Astronomy and Astrophysics, 438 (1): 1391−51, arXiv:astro-ph/0503498, Bibcode:2005A&A...438..139S, doi:10.1051/0004-6361:20042390, S2CID 42282870.
- ^ a b c d Ramírez, I.; et al. (February 2013), "Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo", The Astrophysical Journal, 764 (1): 78, arXiv:1301.1582, Bibcode:2013ApJ...764...78R, doi:10.1088/0004-637X/764/1/78, S2CID 118751608.
- ^ a b Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
- ^ "18 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-26.
- ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.