Astronomy:Eta2 Doradus
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Short description: Star in the constellation Dorado
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E.
- ↑ 4.0 4.1 4.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K.
- ↑ "HD 43455". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+43455.
- ↑ "Circumpolar Calculations | Celestial Observation | Space FM". https://www.space.fm/astronomy/starsgalaxies/circumpolarcalculations.html.
- ↑ Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1975mcts.book.....H.
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