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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.
| 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 |
| Distance | 109.45 ly |
| Absolute magnitude (MV) | +2.67 |
| Details | |
| Radius | 2.19 R☉ |
| Luminosity | 9.512 L☉ |
| Temperature | 6849 K |
| Metallicity [Fe/H] | 0.04±0.15 dex |
| Age | 1300 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References edit
- ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Pandey, Jeewan C.; Karmakar, Subhajeet (8 January 2015). "An X-Ray Flare from 47 Cas". The Astronomical Journal. 149 (2): 6. arXiv:1412.3267. Bibcode:2015AJ....149...47P. doi:10.1088/0004-6256/149/2/47.
- ^ a b c Guedel, M.; Schmitt, J.H.M.M.; Benz, A.O. (8 November 1994). "A bright X-ray and radio corona on the F0V star 47 Cas?". Astronomy and Astrophysics. 293. Astronomy and Astrophysics 293L, L49-L52 (1995): 4. Bibcode:1995A&A...293L..49G.
- ^ a b "* 47 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-11-24.
- ^ Audard, Marc; Güdel, Manuel; Guinan, Edward F. (25 January 1999). "Implications from Extreme-Ultraviolet Observations for Coronal Heating of Active Stars". The Astrophysical Journal. 513 (1): 4. Bibcode:1999ApJ...513L..53A. doi:10.1086/311907.
- ^ Ian Ridpath's Star Tales - Custos Messium
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