47 Cassiopeiae

47 Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 02h 05m 8.002s[1]
Declination +77° 16′ 51.804″[1]
Apparent magnitude (V) +5.38
Characteristics
Evolutionary stage main sequence
Spectral type F0Vn[2][3]
Astrometry
Radial velocity (Rv)−20.3±3.6 km/s
Proper motion (μ) RA: −47.79±0.39 mas/yr
Dec.: 139.92±0.45 mas/yr
Distance109.45 ly
Absolute magnitude (MV)+2.67
Details
Radius2.19 R☉
Luminosity9.512 L☉
Temperature6849 K
Metallicity [Fe/H]0.04±0.15 dex
Age1300 Myr
Other designations
47 Cas, BD+76°63, GC 2459, HD 12230, HIP 9727, HR 581, SAO 4562[4]
Database references
SIMBADdata

47 Cassiopeiae (also designated as or called 47 Cas, HR 581, TYC 4499-2252-1, HD 12230, and HIP 9727[4]) is an F-type main-sequence star located 109.45 light years away in the constellation of Cassiopeia. 47 Cassiopeiae is visible to the naked eye in dark skies and is almost never visible in areas with light pollution.

The star forms a binary with an unseen companion, 47 Cassiopeiae B, detected only in the radio spectrum. The star, despite being poorly known, has been observed to emit X-rays and microwaves in large flares.[2][3] It was historically catalogued as an A7V star, but later dropped to F0V. Based on kinematics, this star is likely part of the Pleiades moving group.[3] Despite being much more luminous and massive then the Sun, this star has been used as a solar analog.[5]

The star was a bright star in the occasionally used 1775 to 19th century constellation Custos Messium, typically drawn as a depiction of Charles Messier standing on top of the giraffe (Camelopardalis), between Cepheus and Cassiopeia.[6]

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