HD 23277
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 03h 49m 13.7393s[2] |
| Declination | +70° 52′ 15.781″[2] |
| Apparent magnitude (V) | 5.391 ± 0.009[3] |
| Characteristics | |
| Spectral type | kA2hA6VmA7[4] |
| U−B color index | +0.12[5] |
| B−V color index | +0.09[5] |
| Astrometry | |
| Radial velocity (Rv) | 17 ± 0.9[6] km/s |
| Proper motion (μ) | RA: 21.451(45) mas/yr[2] Dec.: −62.431(55) mas/yr[2] |
| Parallax (π) | 8.7759±0.0632 mas[2] |
| Distance | 372 ± 3 ly (113.9 ± 0.8 pc) |
| Absolute magnitude (MV) | +0.27[1] |
| Orbit[7] | |
| Primary | HD 23277 A |
| Companion | HD 23277 B |
| Period (P) | 15.5132 d |
| Semi-major axis (a) | 43.0229 AU |
| Eccentricity (e) | 0.2210 |
| Argument of periastron (ω) (secondary) | 287.41° |
| Argument of periastron (ω) (primary) | 107.41° |
| Semi-amplitude (K1) (primary) | 22.20 km/s |
| Semi-amplitude (K2) (secondary) | 24.69 km/s |
| Details | |
| A | |
| Mass | 2.38 ± 0.13[8] M☉ |
| Radius | 3.55+0.16 −0.24[8] R☉ |
| Luminosity | 59.7[9] L☉ |
| Surface gravity (log g) | 3.72 ± 0.08[8] cgs |
| Temperature | 8,317+194 −189[8] K |
| Rotational velocity (v sin i) | 25 ± 5[10] km/s |
| Age | 610[11] Myr |
| B | |
| Mass | 2.11[7] M☉ |
| Rotational velocity (v sin i) | 25 ± 5[10] km/s |
| Other designations | |
| BD+70°257, HD 23277, HIP 17854, HR 1138, SAO 5000 | |
| Database references | |
| SIMBAD | data |
HD 23277 (HR 1138) is a spectroscopic binary[12] located in the northern circumpolar constellation Camelopardalis. With a combined apparent magnitude of 5.39,[3] it is faintly visible to the naked eye under ideal conditions. This star is located at a distance of 372 light years,[2] but is drifting away at a rate of 17 km/s.[6]
The primary has a classification of kA2hA6VmA7,[4] which indicates that it has the calcium K-line of an A2 star, but its hydrogen lines suggest a class of A6 V and metallic lines of an A7 star. At present it has 2.38 times the Sun's mass, and 3.55 times its radius.[8] It radiates at 59.7 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 8,317 K,[8] which gives it a white hue. The companion has 2.11 times the Sun's mass,[7] which suggests it is an A-type main-sequence star like the primary. Both stars spin at a projected rotational velocity of 25 km/s, common for an Am star.[10]
