55 Andromedae

55 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 01h 53m 17.34441s[1]
Declination +40° 43′ 47.2538″[1]
Apparent magnitude (V) 5.42[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.41[4]
B−V color index +1.32[4]
Astrometry
Radial velocity (Rv)−7.59±0.2[5] km/s
Proper motion (μ) RA: −10.073[1] mas/yr
Dec.: −4.483[1] mas/yr
Parallax (π)4.4619 ± 0.1001 mas[1]
Distance730 ± 20 ly
(224 ± 5 pc)
Absolute magnitude (MV)−1.00[2]
Details
Luminosity436.43[2] L☉
Surface gravity (log g)2.30[3] cgs
Temperature4,290[3] K
Metallicity [Fe/H]−0.14[3] dex
Other designations
55 And, BD+40° 394, FK5 2124, HD 11428, HIP 8814, HR 543, SAO 37587, PPM 44535, WDS J01533+4044A[6]
Database references
SIMBADdata

55 Andromedae, abbreviated 55 And, is a single,[7] orange-hued star in the northern constellation of Andromeda. 55 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 5.42.[2] Based upon an annual parallax shift of 4.7 mas,[1] it is located about 730 light years from the Sun. 55 And is moving closer to the Earth with a heliocentric radial velocity of −7.6 km/s.[5] It is a member of the Sirius supercluster.[8]

This is an aging giant star with a stellar classification of K1 III,[3] which indicates it has exhausted the hydrogen supply at its core and evolved away from the main sequence. It is radiating 436[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,290 K.[3] It has a magnitude 10.90 visual companion at an angular separation of 59.00″ along a position angle of 357° from 55 And. In 1828, this separation was just 20.0″.[9]

  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 Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference McWilliam1990 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Argue was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggen1996 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).