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Star in the constellation Cassiopeia From Wikipedia, the free encyclopedia
HR 244 is a single[7] star in the constellation Cassiopeia. It has a yellow-white hue and is visible to the naked eye with an apparent visual magnitude of 4.80.[2] Based upon parallax measurements, it is located at a distance of 62 light years from the Sun, and is drifting further away with a radial velocity of +20.7 km/s;[1] around 546,000 years ago it passed within 38 light-years of the Sun.[4] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.183 arcseconds per annum.[8]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 00h 53m 04.19644s[1] |
Declination | +61° 07′ 26.2993″[1] |
Apparent magnitude (V) | 4.80[2] |
Characteristics | |
Evolutionary stage | subgiant[1] |
Spectral type | F9V[3] |
B−V color index | 0.540±0.008[4] |
Astrometry | |
Radial velocity (Rv) | +20.68±0.12[1] km/s |
Proper motion (μ) | RA: –68.298[1] mas/yr Dec.: +169.435[1] mas/yr |
Parallax (π) | 52.9017 ± 0.1037 mas[1] |
Distance | 61.7 ± 0.1 ly (18.90 ± 0.04 pc) |
Absolute magnitude (MV) | 3.44[4] |
Details | |
Mass | 1.194[5] M☉ |
Radius | 1.77[1] R☉ |
Luminosity | 3.7[1] L☉ |
Surface gravity (log g) | 0.53[2] cgs |
Temperature | 5,986[1] K |
Metallicity [Fe/H] | 0.04[5] dex |
Rotational velocity (v sin i) | 8.1[2] km/s |
Age | 5.3[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This object is an F-type star with a stellar classification of F9V.[3] Despite the spectral class, evolutionary models show it to have left the main sequence and is now a subgiant.[1] It is 5.3[5] billion years old and is spinning with a projected rotational velocity of 8 km/s.[2] The star has 1.2[5] times the mass of the Sun and 1.8[1] times the Sun's radius. It is radiating 3.7 times the luminosity of the Sun from its photosphere at an effective temperature of 5,986 K.[1]
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