HD 2421
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Andromeda |
Right ascension | 0h 28m 13.655s[1] |
Declination | +44° 23′ 40.03″[1] |
Apparent magnitude (V) | 5.18 |
Characteristics | |
Spectral type | A2V[2]/F2V[3] |
Astrometry | |
Proper motion (μ) | RA: ±0.17 85.12[1] mas/yr Dec.: ±0.16 −14.90[1] mas/yr |
Parallax (π) | 11.54 ± 0.28[1] mas |
Distance | 283 ± 7 ly (87 ± 2 pc) |
Orbit[4] | |
Primary | HD 2421A |
Companion | HD 2421B |
Period (P) | 29±0.00003 d 3.955 |
Eccentricity (e) | ±0.011 0.135 |
Periastron epoch (T) | 448523.14±0.04 2 |
Argument of periastron (ω) (secondary) | ±4 280° |
Argument of periastron (ω) (primary) | ±8 91° |
Semi-amplitude (K1) (primary) | ±0.6 km/s 49.1 |
Semi-amplitude (K2) (secondary) | ±1.0 km/s 81.1 |
Other designations | |
Database references | |
SIMBAD | data |
HD 2421 is a spectroscopic binary with a class A main-sequence primary and a class F main-sequence secondary[3] in the constellation Andromeda. Its apparent magnitude is 5.18 and it is approximately 283 light years away based on parallax.
Binary system
The binary has a period of 3.96 days and a eccentricity of 0.135. The variable radial velocity was first reported by Robert Horace Baker in 1909 and the first orbit computed by Stella Udick in 1912.[6] A refined orbit was published in 1993 resulting in updated orbital parameters.[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
- ↑ Cowley, A.; et al. (1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
- 1 2 Adelman, Saul J.; et al. (2015). "Elemental Abundance Analyses with DAO Spectrograms. XXXVIII. The SB2 Stars HR 104 (A2 V) and θ Aql (B9.5 III)". Publications of the Astronomical Society of the Pacific. 127 (952): 509–515. Bibcode:2015PASP..127..509A. doi:10.1086/682075.
- 1 2 Hill, Graham; et al. (1993). "The double-lined spectroscopic binary HR 104". Publications of the Astronomical Society of the Pacific. 105: 748–750. Bibcode:1993PASP..105..748H. doi:10.1086/133225.
- ↑ "HD 2421". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-03.
- ↑ Udick, Stella (1912). "The orbit of B. D. + 43° 92". Publications of the Allegheny Observatory of the University of Pittsburgh. 2 (18): 191–196. Bibcode:1912PAllO...2..191U.
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