39 Andromedae

39 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 01h 02m 54.25356s[1]
Declination +41° 20′ 42.7673″[1]
Apparent magnitude (V) 5.95[2]
Characteristics
Spectral type kA3hA7VmA9[3]
B−V color index +0.161±0.009[2]
Astrometry
Radial velocity (Rv)+3.1±0.9[4] km/s
Proper motion (μ) RA: −17.558[1] mas/yr
Dec.: −18.400[1] mas/yr
Parallax (π)9.5725 ± 0.0805 mas[1]
Distance341 ± 3 ly
(104.5 ± 0.9 pc)
Absolute magnitude (MV)0.80[2]
Details
Radius1.2[5] R☉
Luminosity39.95[2] L☉
Surface gravity (log g)3.93[6] cgs
Temperature8,073[6] K
Metallicity [Fe/H]+0.13[6] dex
Rotational velocity (v sin i)34[6] km/s
Other designations
39 And, BD+40° 209, HD 6116, HIP 4903, HR 290, SAO 36874, PPM 43575, WDS J01029+4121A[7]
Database references
SIMBADdata

39 Andromedae, abbreviated 39 And, is a double star in the northern constellation Andromeda. 39 Andromedae is the Flamsteed designation. Its apparent visual magnitude is 5.95,[2] which indicates it is near the lower limit on visibility to the naked eye. The distance to this star, as estimated from its annual parallax shift of 9.57 mas,[1] is 341 light years. It is a suspected member of the Ursa Major Moving Group, although King et al. (2003) list it as a probable non-member.[8]

The brighter component is a confirmed Am star[9] with a stellar classification of kA3hA7VmA9.[3] This notation indicates its spectrum displays the calcium K line of an A3 star, the hydrogen lines of an A7 V, or A-type main-sequence star, and the metal lines of an A9 star. It is radiating 40[2] times the Sun's luminosity from its photosphere at an effective temperature of 8,073 K.[6] As of 2015, the magnitude 12.48 companion star is located at an angular separation of 20.5″ along a position angle of 3° from the primary.[10]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Levato1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Monier2005 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 king2003 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Renson2009 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).