Lambda Andromedae

Lambda Andromedae
Location of λ Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 37m 33.84278s[1]
Declination +46° 27′ 29.3447″[1]
Apparent magnitude (V) 3.65 - 4.05[2]
Characteristics
Evolutionary stage subgiant[3]
Spectral type G8 III-IV[4] or G8 IV[3]
U−B color index +0.688[5]
B−V color index +0.996[5]
Variable type RS CVn[2]
Astrometry
Radial velocity (Rv)+6.8[6] km/s
Proper motion (μ) RA: 159.606(101)[1] mas/yr
Dec.: −421.822(97)[1] mas/yr
Parallax (π)38.5736 ± 0.1179 mas[1]
Distance84.6 ± 0.3 ly
(25.92 ± 0.08 pc)
Absolute magnitude (MV)1.91[7]
Details
Mass1.24±0.72[8] M☉
Radius7.787±0.053[8] R☉
Luminosity28.8[8] L☉
Surface gravity (log g)2.75±0.25[4] cgs
Temperature4,800±100[4] K
Metallicity [Fe/H]−0.56[9] dex
Rotation54 d[4]
Rotational velocity (v sin i)7.3[10] km/s
Other designations
λ And, 16 Andromedae, BD+45°4283, FK5 890, GJ 9832, HD 222107, HIP 116584, HR 8961, SAO 53204, PPM 64456, LTT 16964, NLTT 57442[11]
Database references
SIMBADdata

Lambda Andromedae, Latinized from λ Andromedae, is the Bayer designation for a binary star system in the northern constellation of Andromeda. At an estimated distance of approximately 84.6 light-years (25.9 parsecs) from Earth,[1] it has an apparent visual magnitude of +3.8.[5] This is bright enough to be seen with the naked eye. The system is drifting further away from the Sun with a radial velocity of +6.8 km/s.[6]

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  3. ^ a b Cite error: The named reference Fionnagáin_et_al_2021 was invoked but never defined (see the help page).
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  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).