18 Camelopardalis

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 mas[1]
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

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]

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. ^ 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.
  2. ^ 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.
  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, S2CID 42282870.
  6. ^ 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.
  7. ^ 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.
  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, S2CID 2603568.

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