| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 06 11 15.0 |
| Declination | −65° 35′ 21.9″ |
| Apparent magnitude (V) | 5.01 |
| Characteristics | |
| Spectral type | M2.5III |
| B−V color index | 1.599 |
| Astrometry | |
| Radial velocity (Rv) | +34.5±0.8 km/s |
| Proper motion (μ) | RA: -23.823 mas/yr Dec.: +118.639 mas/yr |
| Parallax (π) | 5.6046 ± 0.1562 mas |
| Distance | 580 ± 20 ly (178 ± 5 pc) |
| Absolute magnitude (MV) | −1.45 |
| Details | |
| Radius | 81.89 R☉ |
| Luminosity | 1165 L☉ |
| Surface gravity (log g) | 0.403 cgs |
| Temperature | 3,726+313 −154 K |
| Other designations | |
| η Dor, CPD−65°561, FK5 2473, GC 7946, HD 43455, HIP 29353, HR 2245, SAO 249469, PPM 355229, TYC 8901-1098-1 | |
| Database references | |
| SIMBAD | data |
Eta Doradus, Latinized from η 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 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. It is circumpolar south of latitude 24° 24′ S.
This object is an M-type giant star, with its stellar classification being M2.5III. It has left the main sequence after exhausting its core hydrogen and expanded to around 80 R☉. The star is radiating about 1200 times the Sun's luminosity from its photosphere, at an effective temperature of 3726 K.
References
- ^ 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.
- ^ 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.
- McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. S2CID 73594365.
- "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.
External links
- 2004. Starry Night Pro, Version 5.8.4. Imaginova. ISBN 978-0-07-333666-4. www.starrynight.com
