4 Andromedae

4 Andromedae, abbreviated 4 And, is a single[8] star in the northern constellation of Andromeda. 4 Andromedae is the Flamsteed designation. It is dimly visible to the naked eye with an apparent visual magnitude of 5.308.[2] Based upon an annual parallax shift of 9.7 mas[1] as seen from Earth's orbit, it is located 337 light years away. The star is moving closer with a heliocentric radial velocity of −11 km/s.[4] It has a magnitude 11.7 visual companion at an angular separation of 51.10″ along a position angle of 348°, as of 2002.[9]

Not to be confused with Andromeda IV.
4 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 07m 39.26682s[1]
Declination +46° 23′ 14.0325″[1]
Apparent magnitude (V) 5.308[2]
Characteristics
Spectral type K5 III[3]
B−V color index 1.436[2]
Astrometry
Radial velocity (Rv)−11.3±0.3[4] km/s
Proper motion (μ) RA: −12.460[1] mas/yr
Dec.: −30.172[1] mas/yr
Parallax (π)9.6771 ± 0.1143[1] mas
Distance337 ± 4 ly
(103 ± 1 pc)
Details
Mass1.58±0.44[5] M☉
Radius25.9[6] R☉
Luminosity170[6] L☉
Surface gravity (log g)1.91[2] cgs
Temperature4,275±92[5] K
Metallicity [Fe/H]1.98±0.11[5] dex
Age2.24+0.78
−0.58[5] Gyr
Other designations
4 And, BD+45° 4149, FK5 3852, HD 218452, HIP 114200, HR 8804, SAO 52711, WDS J23077+4623A[7]
Database references
SIMBADdata

At the age of 2.2[5] billion years, this is an aging giant star with a stellar classification of K5 III,[3] having consumed the hydrogen at its core and evolved away from the main sequence. It has 1.6[5] times the mass of the Sun and has expanded to 26[6] times the Sun's radius. The star is radiating 170[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,275 K.[5]

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.
  2. Soubiran, Caroline; et al. (2016), "The PASTEL catalogue: 2016 version", Astronomy & Astrophysics, 591: A118, arXiv:1605.07384, Bibcode:2016A&A...591A.118S, doi:10.1051/0004-6361/201628497.
  3. Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode:1962RGOB...51...79E.
  4. Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  5. Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817: 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40.
  6. Aurière, M.; et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: 30, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, A90.
  7. "4 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 12, 2018.
  8. 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.
  9. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22.
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