36 Andromedae

36 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 54m 58.10609s[1]
Declination +23° 37′ 41.9799″[1]
Apparent magnitude (V) 5.45[2] (6.12 + 6.54)[3]
Characteristics
Spectral type G8 IV + K3 IV[4]
B−V color index 1.012±0.010[5]
Astrometry
Radial velocity (Rv)−0.84±0.12[6] km/s
Proper motion (μ) RA: 135.43±1.00[1] mas/yr
Dec.: −48.61±0.48[1] mas/yr
Parallax (π)26.33 ± 0.65 mas[1]
Distance124 ± 3 ly
(38.0 ± 0.9 pc)
Absolute magnitude (MV)2.56[5]
Orbit[7]
Period (P)61183±69 d
Semi-major axis (a)0.9837±0.0011″
Eccentricity (e)0.30603±0.00078
Inclination (i)44.57±0.11°
Longitude of the node (Ω)173.66±0.13°
Periastron epoch (T)35543 ± 21
Argument of periastron (ω)
(secondary)		358.62±0.21°
Details
Luminosity11.57[5] L☉
Other designations
36 And, NSV 343, BD+22° 146, HD 5286, HIP 4288, HR 258, SAO 74359, PPM 90284, ADS 755, WDS J00550+2338AB[8]
Database references
SIMBADdata

36 Andromedae is a visual binary star[4][9] system in the northern constellation of Andromeda. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. It is faintly visible to the naked eye with an apparent visual magnitude of 5.45.[2] An annual parallax shift of 26.33 mas yields a distance estimate of about 124 light years. The system is moving closer to the Sun with a radial velocity of −0.8 km/s.[6]

The binary nature of this system was discovered in 1832 by the German-Russian astronomer Wilhelm von Struve.[4] It is a wide binary with an orbital period of 167.5 years and an eccentricity of 0.3.[7] As of 2016, the pair had an angular separation of 0.90 arc seconds along a position angle of 330°.[3]

The primary, component A, is a magnitude 6.12[3] F-type star with a stellar classification of G8 IV,[4] while the secondary, component B, has a magnitude of 6.54[3] and is a K-type star of class K3 IV.[4] Their brightness compared to their temperatures indicate they are evolving subgiant stars. However, at least one of the components is subject to flare activity, which may suggest they are instead pre-main sequence stars.[4]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Tamazian2000 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Hartkopf2006 was invoked but never defined (see the help page).
  8. ^ "36 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-02.
  9. ^ Cite error: The named reference Muterspaugh2010 was invoked but never defined (see the help page).