12 Andromedae

12 Andromedae is a single[2] star in the northern constellation of Andromeda. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. It has an apparent visual magnitude of 5.87,[2] which indicates it is just visible to the naked eye under good seeing conditions. An annual parallax shift of 23.83[1] mas provides a distance estimate of 137 light years. The star is moving closer to the Sun with a radial velocity of −10.5 km/s.[5]

12 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 20m 53.2646s[1]
Declination +38° 10′ 56.384″[1]
Apparent magnitude (V) 5.87[2]
Characteristics
Spectral type F5 V[2][3]
B−V color index 0.45[4]
Astrometry
Radial velocity (Rv)−10.5±0.3[5] km/s
Proper motion (μ) RA: 129.320±0.024[1] mas/yr
Dec.: −60.049±0.021[1] mas/yr
Parallax (π)23.83 ± 0.34[1] mas
Distance137 ± 2 ly
(42.0 ± 0.6 pc)
Absolute magnitude (MV)2.66[3]
Details
Mass1.25[6] M☉
Luminosity7.38[3] L☉
Surface gravity (log g)3.92±0.14[6] cgs
Temperature6,454±219[6] K
Metallicity [Fe/H]+0.00[7] dex
Rotational velocity (v sin i)12[4] km/s
Age2.548[6] Gyr
Other designations
12 And, BD+37° 4817, FK5 1610, HD 220117, HIP 115280, HR 8885, SAO 73190, WDS J23209+3811A[8]
Database references
SIMBADdata

This is an ordinary F-type main-sequence star with a stellar classification of F5 V.[2] It is about 2.5[6] billion years old and is spinning with a projected rotational velocity of 12 km/s.[4] The abundance of iron is similar to that in the Sun.[7] The star has an estimated 1.25[6] times the mass of the Sun and is radiating just over 7[3] times the Sun's luminosity from its photosphere at an effective temperature of around 6,454 K.[6]

References
  1. Gaia Collaboration; et al. (November 2016), "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties", Astronomy & Astrophysics, 595: 23, arXiv:1609.04172, Bibcode:2016A&A...595A...2G, doi:10.1051/0004-6361/201629512, A2.
  2. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  3. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  4. Takeda, Yoichi; et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F-K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan, 57 (1): 13–25, Bibcode:2005PASJ...57...13T, doi:10.1093/pasj/57.1.13.
  5. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. Takeda, Yoichi (April 2007), "Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database", Publications of the Astronomical Society of Japan, 59 (2): 335–356, Bibcode:2007PASJ...59..335T, doi:10.1093/pasj/59.2.335.
  8. "12 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-01.
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