| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 02h 38m 02.03097s[1] |
| Declination | +72° 49′ 05.7106″[1] |
| Apparent magnitude (V) | 5.17[2] |
| Characteristics | |
| Spectral type | G8III[3] |
| B−Vcolor index | +0.896±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.69±0.13[1] km/s |
| Proper motion (μ) | RA: −27.441[1]mas/yr Dec.: +15.627[1]mas/yr |
| Parallax (π) | 12.1723±0.1139 mas[1] |
| Distance | 268 ± 3 ly (82.2 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.70[2] |
| Details | |
| Mass | 2.55±0.68[4] M☉ |
| Radius | 10.06+0.15 −0.17[1] R☉ |
| Luminosity | 60.7±0.7[1] L☉ |
| Surface gravity (log g) | 2.91±0.11[4] cgs |
| Temperature | 5,080+37 −42[1] K |
| Metallicity [Fe/H] | 0.02±0.05[4] dex |
| Age | 977+198 −164[4] Myr |
| Other designations | |
| BD+72°140,FK5 87,GC 3116,HD 15920,HIP 12273,HR 743,SAO 4694,GSC 04320-02109[5] | |
| Database references | |
| SIMBAD | data |
HD 15920 is a single[6]star in the northernconstellation ofCassiopeia. It has a yellow hue and is visible to the naked eye as a dim point of light with anapparent visual magnitude of 5.17.[2] This object is located at a distance of approximately 268 light years from theSun based onparallax, but it is drifting closer with aradial velocity of −4 km/s.[1]
This object is an aginggiant star with astellar classification of G8III.[3] After exhausting the supply of hydrogen at itscore, this star has cooled and expanded off the main sequence – at present it has ten times thegirth of the Sun.[1] The star is around a billion years old[4] with 2.6[4] times themass of the Sun. It is radiating 61 times theSun's luminosity from its swollenphotosphere at aneffective temperature of 5,080 K.[1] HD 15920 is the most likely source for theX-ray emission detected at these coordinates.[7]
