2 Andromedae

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2 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 02m 36.38176s[1]
Declination +42° 45′ 28.0628″[1]
Apparent magnitude (V) 5.093
Characteristics
Spectral type A1 V[2]
U−B color index +0.10[3]
B−V color index +0.08[3]
Astrometry
2 And A
Radial velocity (Rv)2.10 ± 2.4[4] km/s
Proper motion (μ) RA: 56.38[1] mas/yr
Dec.: −4.47[1] mas/yr
Parallax (π)7.74 ± 0.51[1] mas
Distance420 ± 30 ly
(129 ± 9 pc)
Absolute magnitude (MV)−0.39±0.16[5]
2 And B
Absolute magnitude (MV)1.88±0.16[5]
Orbit[6]
Period (P)73.997 ± 0.509 yr
Semi-major axis (a)0.225 ± 0.011″
Eccentricity (e)0.800 ± 0.056
Inclination (i)21.7 ± 46.0°
Longitude of the node (Ω)159.5 ± 2.0°
Periastron epoch (T)1870.280 ± 0.595
Argument of periastron (ω)
(secondary)
356.4 ± 3.0°
Other designations
BD+41° 4665, GJ 886.1, HD 217782, HIP 113788, HR 8766, SAO 52623
Database references
SIMBAD2 And
2 And A
2 And B

2 Andromedae (abbreviated 2 And) is a binary star in the constellation Andromeda. 2 Andromedae is the Flamsteed designation. Its apparent magnitude is 5.09.

The binary nature of the star was discovered by Sherburne Wesley Burnham at Lick Observatory in 1889.[7]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. 
  3. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M. 
  4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  5. ^ a b Jerzykiewicz, M.; et al. (2015). "The 2003–2004 multisite photometric campaign for the β Cephei and eclipsing star 16 (EN) Lacertae with an appendix on 2 Andromedae, the variable comparison star". Monthly Notices of the Royal Astronomical Society. 454 (1): 724–740. arXiv:1508.05250Freely accessible. Bibcode:2015MNRAS.454..724J. doi:10.1093/mnras/stv1958. 
  6. ^ Rica Romero, F. M. (2010). "Orbital elements for eight binaries. Study of the nature of wide components. I" (PDF). Revista Mexicana de Astronomía y Astrofísica. 46: 263–277. Bibcode:2010RMxAA..46..263R. 
  7. ^ Burnham, S. W. (1894). "Sixteenth Catalogue of New Double Stars Discovered at the Lick Observatory". Publications of Lick Observatory. 2: 197–205. Bibcode:1894PLicO...2..197B. 

External links[edit]