2 Andromedae
Not to be confused with Andromeda II.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 23h 02m 36.38s[1] |
Declination | +42° 45′ 28.1″[1] |
Apparent magnitude (V) | 5.093 |
Characteristics | |
Spectral type | A3Vn |
U−B color index | 0.11 |
B−V color index | 0.09 |
Astrometry | |
2 Andromedae A | |
Radial velocity (Rv) | 2 km/s |
Proper motion (μ) | RA: 56.38 ± 0.30[1] mas/yr Dec.: −4.47 ± 0.38[1] mas/yr |
Parallax (π) | 7.74 ± 0.51[1] mas |
Distance | 420 ± 30 ly (129 ± 9 pc) |
Absolute magnitude (MV) | ±0.16 −0.39[2] |
2 Andromedae B | |
Absolute magnitude (MV) | ±0.16 1.88[2] |
Orbit[3] | |
Companion | 2 Andromedae B |
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 |
Other designations | |
Database references | |
SIMBAD | data |
Database references | |
SIMBAD | data |
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.[4]
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
- 1 2 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:1508.05250. Bibcode:2015MNRAS.454..724J. doi:10.1093/mnras/stv1958.
- ↑ 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.
- ↑ 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
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