Eta2 Doradus
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Dorado[1] |
| Right ascension | 06h 11m 14.98s[2] |
| Declination | −65° 35′ 21.9″[2] |
| Apparent magnitude (V) | 5.01[1] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M2.5III[1] |
| B−V color index | 1.599[1] |
| Astrometry | |
| Radial velocity (Rv) | +34.5±0.8[1] km/s |
| Proper motion (μ) | RA: −23.823[2] mas/yr Dec.: +118.639[2] mas/yr |
| Parallax (π) | 5.6046±0.1562 mas[2] |
| Distance | 580 ± 20 ly (178 ± 5 pc) |
| Absolute magnitude (MV) | −1.45[1] |
| Details | |
| Mass | 1.4[4] M☉ |
| Radius | 81.89[2] R☉ |
| Luminosity | 1,165[2] L☉ |
| Surface gravity (log g) | 1.61[4] cgs |
| Temperature | 3,726+313 −154[2] K |
| Metallicity [Fe/H] | −0.13[4] dex |
| Other designations | |
| η2 Dor, CPD−65°561, FK5 2473, GC 7946, HD 43455, HIP 29353, HR 2245, SAO 249469, PPM 355229, TYC 8901-1098-1[5] | |
| Database references | |
| SIMBAD | data |
Eta2 Doradus, Latinized from η2 Doradus, is a star in the southern constellation of Dorado. It is visible to the naked eye as a dim, reddish star with an apparent visual magnitude of 5.01[1] It is about 580 light years from the Sun as shown by parallax, and its net movement is one of receding, having a radial velocity of +34.5 km/s.[1] It is circumpolar south of latitude 24° 24′ S.[6]
This object is an M-type giant star, with its stellar classification being M2.5III.[1][7] It has left the main sequence after exhausting its core hydrogen and expanded to around 80 R☉. The star is radiating about 1,200 times the Sun's luminosity from its photosphere, at an effective temperature of 3,726 K.[2]
References
- ^ a b c d e f g h i 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. XHIP record for this object at VizieR.
- ^ a b c d e f g h i 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.
- ^ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
- ^ a b c Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ^ "HD 43455". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 25, 2008.
- ^ "Circumpolar Calculations | Celestial Observation | Space FM".
- ^ 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.
