3 Andromedae

Not to be confused with Andromeda III.
3 Andromedae
Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings
3 Andromedae (circled) in a close northerly run-of-stars asterism – 5, 7, 8, 11 being close by, south-westward.
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 04m 10.98269s[1]
Declination +50° 03′ 07.5255″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Evolutionary stage giant[3]
Spectral type K0 IIIb[4]
B−V color index 1.058±0.003[2]
Astrometry
Radial velocity (Rv)−34.87±0.12[1] km/s
Proper motion (μ) RA: 165.837[1] mas/yr[1]
Dec.: 167.716 mas/yr[1]
Parallax (π)17.2629 ± 0.0918 mas[1]
Distance189 ± 1 ly
(57.9 ± 0.3 pc)
Absolute magnitude (MV)0.97[2]
Details
Mass1.71[5] M☉
Radius10[6] R☉
Luminosity49[5] L☉
Surface gravity (log g)2.61±0.11[7] cgs
Temperature4,668±45[5] K
Metallicity [Fe/H]−0.08[3] dex
Rotational velocity (v sin i)1.0[8] km/s
Age2.27[5] Gyr
Other designations
3 And, BD+49° 4028, HD 218031, HIP 113919, HR 8780, SAO 52649, PPM 41448, LTT 16772[9]
Database references
SIMBADdata

3 Andromedae, abbreviated 3 And, is a single[10] star in the northern constellation of Andromeda. 3 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.64.[2] The distance to this star, as determined from an annual parallax shift of 17.3 mas,[1] is 181 light years. It is moving closer to the Earth with a heliocentric radial velocity of −35 km/s,[11] and has a relatively large proper motion, traversing the celestial sphere at 0.236″·yr−1.[12]

This is an evolved giant star with a stellar classification of K0 IIIb,[4] where the 'b' suffix indicated a lower luminosity giant. It is a red clump star,[3] which means it is generating energy through helium fusion at its core. This star has an estimated 1.7[5] times the mass of the Sun (M☉), and, at the age of 2.3[5] billion years, has expanded to 10 times the Sun's radius (R☉).[6] It is radiating 49[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,668 K.[5]

  1. ^ a b c d e f g Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Tautvaisiene2010 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Feuillet2016 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference DeMedeiros2000 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).