HD 23523
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 03h 49m 36.58592s[2] |
| Declination | +63° 17′ 49.0518″[2] |
| Apparent magnitude (V) | 5.82[3] (6.31 + 7.11)[4] |
| Characteristics | |
| Spectral type | A5 Vn[5] |
| B−V color index | +0.18[6] |
| Astrometry | |
| Radial velocity (Rv) | −9.6±3.4[7] km/s |
| Proper motion (μ) | RA: −11.630 mas/yr[2] Dec.: −61.457 mas/yr[2] |
| Parallax (π) | 13.9498±0.3245 mas[2] |
| Distance | 234 ± 5 ly (72 ± 2 pc) |
| Absolute magnitude (MV) | +1.55[1] (combined) |
| Orbit[8] | |
| Primary | HD 23523A[4] |
| Companion | HD 23523B[4] |
| Period (P) | 10.180±0.509 yr |
| Semi-major axis (a) | 0.1020±0.0031″ |
| Eccentricity (e) | 0.441 |
| Details | |
| A | |
| Mass | 1.75 or 1.81[9] M☉ |
| B | |
| Mass | 1.64 or 1.51[9] M☉ |
| Other designations | |
| Moaï 1, AG+63°280, BD+62°612, GC 4560, HD 23523, HIP 17891, HR 1158, SAO 12917, WDS J03496+6318AB[10] | |
| Database references | |
| SIMBAD | data |
HD 23523 (HR 1158) is a binary star[11] located in the northern circumpolar constellation Camelopardalis. It has a combined apparent magnitude of 5.82,[3] making it faintly visible to the naked eye under ideal conditions. When resolved, the primary has an apparent magnitude of 6.31 while the secondary has a magntiude of 7.11.[4] The system is located relatively close at a distance of about 234 light-years based on Gaia DR3 parallax measurements[2] and it currently drifting closer with a somewhat heliocentric radial velocity of −9.6 km/s.[7] At its current distance, HD 23523's combined brightness is diminished by 0.16 magnitudes due to interstellar extinction[12] and it has a combined absolute magnitude of +1.55.[1]
The system was first discovered to be a double star in 1996 by Marcel Carbillet and colleagues after speckle interferometry observations.[13] The stars are only about a tenth of an arcsecond apart,[4] making observing their individual properties difficult. The discovery paper suggested that the two components might be equal based on the dynamical mass.[13] Overall, HD 23523 has a stellar classification of A5 Vn,[5] indicating that it is an A-type main-sequence star with broad or nebulous absorption lines due to rapid rotation. The primary has a mass either 1.75 or 1.81 times the mass of the Sun while the companion has a mass 1.64 or 1.51 times that of the Sun,[9] depending on the approach.
