Astronomy:Lambda Equulei
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 02m 12.50262s[1] |
| Declination | +07° 10′ 47.1545″[1] |
| Apparent magnitude (V) | 6.698[2] (7.41 + 7.64)[3] |
| Characteristics | |
| Astrometry | |
| Radial velocity (Rv) | −4.8±1.6[4] km/s |
| Proper motion (μ) | RA: −8.14[1] mas/yr Dec.: −14.79[1] mas/yr |
| Parallax (π) | 12.35 ± 1.04[1] mas |
| Distance | 260 ± 20 ly (81 ± 7 pc) |
| Absolute magnitude (MV) | 2.16±0.18[2] |
| Details | |
| 2 Equ A | |
| Mass | 1.73[4] M☉ |
| Surface gravity (log g) | 4.05[4] cgs |
| Temperature | 6,561±80[4] K |
| Metallicity [Fe/H] | 0.17[4] dex |
| Age | 1.6[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
λ Equulei (Latinised to Lambda Equulei, abbreviated to λ Equ or Lambda Equ) is a double star system in the constellation of Equuleus. The main component is a F-type main sequence star. As of 2015, the secondary had an angular separation of 2.90 arc seconds along a position angle of 213° from the primary.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 Holmberg, J. et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics 501 (3): 941–947, doi:10.1051/0004-6361/200811191, Bibcode: 2009A&A...501..941H.
- ↑ 3.0 3.1 Mason, B. D. et al. (2014), The Washington Visual Double Star Catalog, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M, http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds, retrieved 2015-07-22
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Casagrande, L. et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics 530 (A138): 21, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C.
- ↑ "2 Equ -- Double or multiple star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=2+Equ, retrieved 2017-02-17.
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