HN Andromedae

HN Andromedae

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]
Distance950 ± 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
Mass2.76±0.18[7] M☉
Radius3.86±0.66[7] R☉
Luminosity93[8] L☉
Surface gravity (log g)3.3[9] cgs
Temperature9,617[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
SIMBADdata

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]

  1. ^ Cite error: The named reference hempelmann was invoked but never defined (see the help page).
  2. ^ 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.
  3. ^ a b c d e Cite error: The named reference GCVS was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference TYCHO was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference 2MASS Cat was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference North1998 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference joshi was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Adelman2004 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Pyper2017 was invoked but never defined (see the help page).