| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Dorado |
| Right ascension | 06 06 09.38154 |
| Declination | −66° 02′ 22.6304″ |
| Apparent magnitude (V) | 5.72 |
| Characteristics | |
| Spectral type | A0V |
| U−B color index | −0.024±0.004 |
| B−V color index | −0.03 |
| Astrometry | |
| Radial velocity (Rv) | +17.6±4.3 km/s |
| Proper motion (μ) | RA: +13.656 mas/yr Dec.: +27.815 mas/yr |
| Parallax (π) | 9.7251 ± 0.1094 mas |
| Distance | 335 ± 4 ly (103 ± 1 pc) |
| Absolute magnitude (MV) | +0.75 |
| Details | |
| Mass | 2.46 M☉ |
| Luminosity | 49 L☉ |
| Surface gravity (log g) | 4.09±0.08 cgs |
| Temperature | 10,325±240 K |
| Rotational velocity (v sin i) | 149 km/s |
| Age | 94 Myr |
| Other designations | |
| η Dor, CPD−66° 493, GC 7813, HD 42525, HIP 28909, HR 2194, SAO 249448, PPM 355182, TYC 8905-1950-1 | |
| 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, white-hued star with an apparent visual magnitude of 5.72. This object is located approximately 335 light years distant from the Sun, based on parallax, and is drifting further away with a radial velocity of +18 km/s. It is circumpolar south of latitude 24°S.
This object is an A-type main-sequence star with a stellar classification of A0V. It is 94 million years old with a high rotation rate, showing a projected rotational velocity of 149. The star has 2.46 times the mass of the Sun and is radiating 49 times the Sun's luminosity from its photosphere at an effective temperature of 10,325 K. It is the southern pole star of Venus.
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.
- ^ 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.
- HR 2194, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 25, 2008.
- ^ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ Decin, L.; et al. (September 2004), "MARCS: Model Stellar Atmospheres and Their Application to the Photometric Calibration of the Spitzer Space Telescope Infrared Spectrograph (IRS)", Astrophysical Journal Supplement, 154 (1): 408–412, arXiv:astro-ph/0406104, Bibcode:2004ApJS..154..408D, doi:10.1086/422884. See Table 1.
- "HD 42525". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 25, 2008.
- Archinal, Brent A.; A'Hearn, Michael F.; Bowell, Edward G.; Conrad, Albert R.; Consolmagno, Guy J.; et al. (2010). "Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2009" (PDF). Celestial Mechanics and Dynamical Astronomy. 109 (2): 101–135. Bibcode:2011CeMDA.109..101A. doi:10.1007/s10569-010-9320-4. S2CID 189842666. Archived from the original (PDF) on 2016-03-04. Retrieved 2018-09-06.
External links
- 2004. Starry Night Pro, Version 5.8.4. Imaginova. ISBN 978-0-07-333666-4. www.starrynight.com
