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22 Andromedae

22 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 10m 19.24653s[1]
Declination +46° 04′ 20.1704″[1]
Apparent magnitude (V) 5.04[2]
Characteristics
Spectral type F5 II[3] or F5 Ib–II metal-weak[4]
B−V color index +0.04[2]
Astrometry
Radial velocity (Rv)−8.2±2.2[5] km/s
Proper motion (μ) RA: 5.472[1] mas/yr
Dec.: 0.086[1] mas/yr
Parallax (π)2.2233 ± 0.3881 mas[1]
Distanceapprox. 1,500 ly
(approx. 450 pc)
Absolute magnitude (MV)−3.51[6]
Details
Mass6.1±0.4[3] M☉
Radius17[7] R☉
Luminosity1,436[8] L☉
Surface gravity (log g)2.10±0.08[3] cgs
Temperature6,270±150[3] K
Metallicity [Fe/H]−0.09±0.05[2] dex
Rotational velocity (v sin i)46[9] km/s
Age62[3] Myr
Other designations
22 And, BD+45° 17, FK5 4, HD 571, HIP 841, HR 27, SAO 36123, PPM 42645[10]
Database references
SIMBADdata

22 Andromedae, abbreviated 22 And, is a single[11] star in the constellation Andromeda. 22 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 5.04.[2] The distance to 22 And can be estimated from its annual parallax shift of just 2.2 mas,[1] which shows it to be around 1,500 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −8.2 km/s.[5]

This is a bright giant with a stellar classification of F5 II.[3] Gray et al. (2001) classify it as F5 Ib–II metal-weak, with the metallic lines matching a class of F0 whereas hydrogen lines match an F5.[4] It is around 62[3] million years old with a projected rotational velocity of 46.[9] The star has six[3] times the mass of the Sun and has expanded to about 17[7] times the Sun's radius. It is radiating 1,436[8] times the Sun's luminosity from its photosphere at an effective temperature of 6,270 km/s.[3]

  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 Cite error: The named reference Soubiran2016 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i Cite error: The named reference Lyubimkov2010 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference gray2001 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference kovtyukh2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Hohle2010 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Danziger1972 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

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