Eta1 Doradus

Eta1 Doradus, Latinized from η1 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.[2] 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.[2] It is circumpolar south of latitude 24°S.

For other stars with this Bayer designation, see η Doradus.
Eta1 Doradus
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension  06h 06m 09.38154s[1]
Declination −66° 02′ 22.6304″[1]
Apparent magnitude (V) 5.72[2]
Characteristics
Spectral type A0V[3]
U−B color index −0.024±0.004[2]
B−V color index −0.03[4]
Astrometry
Radial velocity (Rv)+17.6±4.3[2] km/s
Proper motion (μ) RA: +13.656[1] mas/yr
Dec.: +27.815[1] mas/yr
Parallax (π)9.7251 ± 0.1094[1] mas
Distance335 ± 4 ly
(103 ± 1 pc)
Absolute magnitude (MV)+0.75[2]
Details
Mass2.46[5] M☉
Luminosity49[6] L☉
Surface gravity (log g)4.09±0.08[7] cgs
Temperature10,325±240[7] K
Rotational velocity (v sin i)149[5] km/s
Age94[5] Myr
Other designations
η1 Dor, CPD−66° 493, GC 7813, HD 42525, HIP 28909, HR 2194, SAO 249448, PPM 355182, TYC 8905-1950-1[8]
Database references
SIMBADdata

This object is an A-type main-sequence star with a stellar classification of A0V.[3] It is 94[5] million years old with a high rotation rate, showing a projected rotational velocity of 149.[5] The star has 2.46[5] times the mass of the Sun and is radiating 49[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,325 K.[7]

References
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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, Bibcode:2004ApJS..154..408D, doi:10.1086/422884. See Table 1.
  8. "HD 42525". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 25, 2008.
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