Global InformationHN Andromedae information
 The light curve of HN Andromedae at 350 nm adapted from Hempelmann & Schoeneich, 1987[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 24m 18.6762s[2] |
| Declination | +43° 08′ 31.6293″[2] |
| Apparent magnitude (V) | 6.67 – 6.76 variable[3] |
| Characteristics | |
| Spectral type | A2pSrCrEu[3] |
| Apparent magnitude (B) | 6.704[4] |
| Apparent magnitude (V) | 6.676[4] |
| Apparent magnitude (G) | 6.6505[2] |
| Apparent magnitude (J) | 6.457[5] |
| Apparent magnitude (H) | 6.534[5] |
| Apparent magnitude (K) | 6.495[5] |
| Variable type | α2 CVn[3] |
| Astrometry | |
| Radial velocity (Rv) | 3.0±3.3[6] km/s |
| Proper motion (μ) | RA: −4.355±0.190 [2] mas/yr Dec.: −13.258±0.169[2] mas/yr |
| Parallax (π) | 3.437 ± 0.098 mas[2] |
| Distance | 950 ± 30 ly (291 ± 8 pc) |
| Orbit[7] | |
| Period (P) | 106.357±0.009 days |
| Eccentricity (e) | 0.122±0.010 |
| Periastron epoch (T) | HJD 2444952.21±1.32 |
| Argument of periastron (ω) (secondary) | 279.76±4.75° |
| Semi-amplitude (K1) (primary) | 26.85±0.29 km/s |
| Details | |
| Mass | 2.76±0.18[7] M☉ |
| Radius | 3.86±0.66[7] R☉ |
| Luminosity | 93[8] L☉ |
| Surface gravity (log g) | 3.3[9] cgs |
| Temperature | 9,617[8] K |
| Rotational velocity (v sin i) | <2.35[7] km/s |
| Other designations | |
2MASS J01241868+4308315, BD+42 293, HD 8441, HIP 6560, TYC 2825-2536-1, SAO 37177 | |
| Database references | |
| SIMBAD | data |
HN Andromedae (often abbreviated to HN And) is a variable star in the constellation Andromeda. Its apparent visual magnitude varies between 6.67 and 6.76[3] in a cycle of 69.51 days.[10] It is classified as an α2 Canum Venaticorum variable.[3]
- ^ Cite error: The named reference
hempelmannwas invoked but never defined (see the help page). - ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
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