| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | 08h 35m 19.70886s |
| Declination | −58° 00′ 33.2714″ |
| Apparent magnitude (V) | +4.84 (5.08 + 8.02) |
| Characteristics | |
| Spectral type | K0III |
| B−V color index | 0.981±0.041 |
| Astrometry | |
| Radial velocity (Rv) | +25.62±0.13 km/s |
| Proper motion (μ) | RA: +52.848±0.555 mas/yr Dec.: +28.117±0.491 mas/yr |
| Parallax (π) | 14.5139 ± 0.2692 mas |
| Distance | 225 ± 4 ly (69 ± 1 pc) |
| Absolute magnitude (MV) | 0.68 |
| Details | |
| A | |
| Radius | 11.13+1.11 −0.39 R☉ |
| Luminosity | 64.4±1.4 L☉ |
| Temperature | 4,903+87 −229 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 73389 is a binary star system in the constellation Carina. It has the Bayer designation e2 Carinae; HD 73389 is the identifier from the Henry Draper Catalogue. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of +4.84. Based on parallax measurements, it is located at a distance of approximately 225 light years from the Sun. The system is drifting further away with a radial velocity of +25.6 km/s.
The visual magnitude 5.08 primary, component A, is an aging K-type giant star with a stellar classification of K0III. With the supply of hydrogen at its core exhausted, it has cooled and expanded to 11 times the Sun's radius. It is radiating 64 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,903 K. The secondary companion, component B, has a visual magnitude of 8.02 and is located at an angular separation of 0.30″ along a position angle of 207° from the primary, as of 2015.
References
- ^ a b c d e f g h i j k l Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- ^ "HD 73389". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-11.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22