HD 22676
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Mensa |
| Right ascension | 03h 29m 58.8930s[1] |
| Declination | −78° 21′ 06.6634″[1] |
| Apparent magnitude (V) | 5.67 ± 0.01[2] |
| Characteristics | |
| Evolutionary stage | Horizontal branch[3] |
| Spectral type | G8 III[4] |
| U−B color index | +0.65[5] |
| B−V color index | +0.93[5] |
| Astrometry | |
| Radial velocity (Rv) | 18.4 ± 0.1[6] km/s |
| Proper motion (μ) | RA: −11.565[1] mas/yr Dec.: −26.933[1] mas/yr |
| Parallax (π) | 9.8072±0.0355 mas[1] |
| Distance | 333 ± 1 ly (102.0 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.72[7] |
| Details | |
| Mass | 2.36[8] M☉ |
| Radius | 9.33[9] R☉ |
| Luminosity | 58.06[10] L☉ |
| Surface gravity (log g) | 3.01 ± 0.09[11] cgs |
| Temperature | 5,109 ± 32[11] K |
| Metallicity [Fe/H] | +0.06 ± 0.03[11] dex |
| Rotational velocity (v sin i) | 3.4 ± 1[12] km/s |
| Age | 750[8] Myr |
| Other designations | |
| 1 G. Mensae, CPD−78° 101, HD 22676, HIP 16290, HR 1109, SAO 255998 | |
| Database references | |
| SIMBAD | data |
HD 22676 (HR 1109) is a solitary[13] star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 5.67, making it faintly visible to the naked eye and is currently located at a distance of 333 light years. However, it is recceding from the sun with a radial velocity of 18.4 km/s.
HD 22676 has a stellar classification of G8 III,[4] which indicates that is an evolved late G-type giant star currently on the horizontal branch, specifically the red clump region.[3] At an age of 700 million years,[8] it has expanded to 9.33 times the radius of the Sun. It has 2.36[8] times the Sun's mass and radiates at approximately 58[10] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,109[11] K, which gives it a yellow glow. HD 22676 is slightly metal enriched with an iron abundance 115%[11] that of the Sun and spins lesuirely with a projected rotational velocity of 3.6 km/s.[12]
