18 Camelopardalis

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 around 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 arc seconds.[9]

18 Camelopardalis
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[1] mas
Distance141.7 ± 0.4 ly
(43.4 ± 0.1 pc)
Absolute magnitude (MV)3.234+0.076
−0.079[5]
Details[6]
Mass1.201+0.015
−0.014 M☉
Radius1.93+0.08
−0.04[1] R☉
Luminosity4.242±0.015[1] L☉
Surface gravity (log g)3.95±0.02 cgs
Temperature5,908±38 K
Metallicity [Fe/H]−0.02±0.04 dex
Rotational velocity (v sin i)5[7] km/s
Age5.28+0.25
−0.19 Gyr
Other designations
18 Cam, BD+57° 889, FK5 1150, HD 36066, HIP 25973, HR 1828, SAO 25241[8]
Database references
SIMBADdata

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
  1. 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.
  2. 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, A64.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B.
  8. "18 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-26.
  9. 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.
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