HD 23089
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 03h 46m 02.33087s[2] |
| Declination | +63° 20′ 42.1639″[2] |
| Apparent magnitude (V) | 4.79[3] |
| Characteristics | |
| Spectral type | G2II-III + B9V[4] |
| U−B color index | +0.24[3] |
| B−V color index | +0.79[3] |
| R−I color index | 0.53 |
| Astrometry | |
| Radial velocity (Rv) | -2.4[5] km/s |
| Proper motion (μ) | RA: -0.94[2] mas/yr Dec.: -8.41[2] mas/yr |
| Parallax (π) | 4.08±0.66 mas[2] |
| Distance | approx. 800 ly (approx. 250 pc) |
| Absolute magnitude (MV) | −2.70 – −1.50[6] |
| Orbit[6] | |
| Period (P) | 6,124±3 d |
| Eccentricity (e) | 0.678±0.003 |
| Inclination (i) | 87±4° |
| Periastron epoch (T) | MJD45850±3 |
| Argument of periastron (ω) (secondary) | 136.5±0.6° |
| Semi-amplitude (K1) (primary) | 15.87±0.08 km/s |
| Semi-amplitude (K2) (secondary) | 17.6±0.34 km/s |
| Details | |
| HD 23089 A | |
| Mass | 5.0±0.24[6] M☉ |
| Radius | 41±7.3[6] R☉ |
| Luminosity | 1,150[6] L☉ |
| Surface gravity (log g) | 2.88[7] cgs |
| Temperature | 5,250[6] K |
| Metallicity [Fe/H] | −0.28[7] dex |
| HD 23089 B | |
| Mass | 4.5±0.21[6] M☉ |
| Radius | 5.3±0.9[6] R☉ |
| Luminosity | 708[6] L☉ |
| Temperature | 13,000±300[6] K |
| Rotational velocity (v sin i) | 18[8] km/s |
| Other designations | |
| BD+62°604, HD 23089, HIP 17587, HR 1129, SAO 12891 | |
| Database references | |
| SIMBAD | data |
HD 23089 is a spectroscopic binary[6] star in the northern constellation of Camelopardalis. Based on stellar parallax measurements made by Hipparcos, the system is about 800 ly (250 pc) away from the Sun.[2]
The system consists of a cooler giant star and hotter main sequence companion.[4] The pair orbit each other every 6,124 days, on an orbit that is relatively eccentric, at 0.678. Unpublished speckle observations suggest that the orbit is tilted towards the Earth's line of sight, and it has a relatively high inclination of about 87 degrees.[6]
