47 Andromedae

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Template:Short description

47 Andromedae
Template:Location mark
Location of 47 Andromedae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.60 (6.33 + 6.38)[2]
Characteristics
Spectral type A1m[3] (kA1hF1mF2)[4]
B−V Template:Engvar 0.276[2]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: Script error: No such module "val".[1] mas/yr
Dec.: Script error: No such module "val".[1] mas/yr
Parallax (π)15.9805±0.1578 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Script error: No such module "val"./Script error: No such module "val".[2]
Orbit[2]
Period (P)Script error: No such module "val".
Eccentricity (e)Script error: No such module "val".
Inclination (i)38°
Periastron epoch (T)2,454,293.2187 ± 0.0056 HJD
Semi-amplitude (K1)
(primary)
Script error: No such module "val". km/s
Semi-amplitude (K2)
(secondary)
Script error: No such module "val". km/s
Details
47 And A
Mass1.65[2] Template:Solar mass
RadiusScript error: No such module "val".[2] Template:Solar radius
LuminosityScript error: No such module "val".[2] Template:Solar luminosity
Rotational velocity (v sin i)Script error: No such module "val".[2] km/s
Age710[6] Myr
47 And B
RadiusScript error: No such module "val".[2] Template:Solar radius
LuminosityScript error: No such module "val".[2] Template:Solar luminosity
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)Script error: No such module "val".[2] km/s
Other designations
Template:Odlist[7]
Database references
SIMBADdata

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47 Andromedae is a binary star[2] system in the northern constellation of Andromeda. The designation is from the star catalogue of John Flamsteed, first published in 1712. The system has a combined apparent visual magnitude of 5.60,[2] which is just bright enough to be faintly visible to the naked eye under good seeing conditions. The distance to this system, as determined from an annual parallax shift of 15.9805 mas,[1] is about 204 light years. It is moving away from the Sun with a heliocentric radial velocity of +13.3 km/s.[5]

The binary nature of this system was discovered by John Stanley Plaskett and Reynold Kenneth Young in 1919 using radial velocity measurements taken from Photographic plates obtained at Dominion Astrophysical Observatory in Saanich, British Columbia, Canada.[8] It is a double-lined spectroscopic binary with an orbital period of 35.4 days and an eccentricity of 0.65. The components appear to be nearly identical Am stars, with a magnitude difference of 0.05.[2] The combined stellar classification is A1m.[3]

References

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Template:Stars of Andromeda