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4 Andromedae

Not to be confused with Andromeda IV.
4 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 07m 39.2672s[1]
Declination +46° 23′ 14.0302″[1]
Apparent magnitude (V) 5.308[2]
Characteristics
Evolutionary stage Giant star
Spectral type K5 III[3]
B−V color index 1.436[2]
Astrometry
Radial velocity (Rv)−11.89±0.12[1] km/s
Proper motion (μ) RA: −12.734 mas/yr[1]
Dec.: −30.026 mas/yr[1]
Parallax (π)9.155±0.0779 mas[1]
Distance356 ± 3 ly
(109.2 ± 0.9 pc)[1]
Details
Mass1.58±0.44[4] M☉
Radius23.36±0.59[5] R☉
Luminosity170[6] L☉
Surface gravity (log g)1.91[2] cgs
Temperature4,275±92[4] K
Metallicity [Fe/H]1.98±0.11[4] dex
Age2.24+0.78
−0.58[4] Gyr
Other designations
4 And, BD+45° 4149, FK5 3852, HD 218452, HIP 114200, HR 8804, SAO 52711, PPM 63840, WDS J23077+4623A[7]
Database references
SIMBADdata

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 9.16 mas[1] as seen from Earth's orbit, it is located 356 light years away. At this distance, interstellar extinction diminishes the apparent magnitude of 4 And by 0.5326 magnitudes.[1] The star is moving closer with a heliocentric radial velocity of −11 km/s.[9] It has a magnitude 11.7 visual companion at an angular separation of 51.10″ along a position angle of 348°, as of 2002.[10]

At the age of 2.2[4] 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[4] times the mass of the Sun and has expanded to 23[5] 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.[4]

  1. ^ a b c d e f g h 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 Soubiran2016 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference rob51 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference Feuillet2016 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference baines was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Auriere2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
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