2 Andromedae
| 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 mas[1] |
| Distance | 420 ± 30 ly (129 ± 9 pc) |
| Absolute magnitude (MV) | −0.39±0.16[2] |
| 2 Andromedae B | |
| Absolute magnitude (MV) | 1.88±0.16[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
- ^ a b c d e 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
- ^ 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:1508.05250. Bibcode:2015MNRAS.454..724J. doi:10.1093/mnras/stv1958.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ 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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