Eta1 Doradus

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Eta1 Doradus
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension  06h 06m 09.3817s[1]
Declination −66° 02′ 22.635″[1]
Apparent magnitude (V) 5.697[1]
Spectral type A0V[1]
U−B color index −0.07[2]
B−V color index −0.03[2]
Radial velocity (Rv)17.6 ± 5[1] km/s
Proper motion (μ) RA: 13.51[1] mas/yr
Dec.: 27.98[1] mas/yr
Parallax (π)9.82 ± 0.46[1] mas
Distance330 ± 20 ly
(102 ± 5 pc)
Absolute magnitude (MV)+0.75[3]
Mass2.46[4] M
Luminosity49[5] L
Surface gravity (log g)4.09±0.08[6] cgs
Temperature10,325±240[6] K
Rotational velocity (v sin i)149[4] km/s
Age94[4] Myr
Other designations
η1 Dor, CPD−66° 493, GC 7813, HD 42525, HIP 28909, HR 2194, SAO 249448, PPM 355182, TYC 8905-1950-1[1]
Database references

Eta1 Doradus, Latinized from η1 Doradus, is the Bayer designation for an A-type main sequence star in the constellation of Dorado, around 330 light-years from the Earth.[1] It has an apparent visual magnitude of approximately 5.697.[1] It has a radius of 3.1 solar radii, and a luminosity of 56 suns.[citation needed] This star will be observed to be circumpolar south of latitude 24°S.

η1 Doradus can be considered the south pole star of Venus, as it is the closest bright star to Venus's south celestial pole.[citation needed]


  1. ^ a b c d e f g h i j k "HD 42525". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 25, 2008.
  2. ^ a b 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.
  3. ^ 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.
  4. ^ a b c 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.
  5. ^ 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
  6. ^ a b Table 1, MARCS: Model Stellar Atmospheres and Their Application to the Photometric Calibration of the Spitzer Space Telescope Infrared Spectrograph (IRS), L. Decin, P. W. Morris, P. N. Appleton, V. Charmandaris, L. Armus, and J. R. Houck, Astrophysical Journal Supplement 154, #1 (September 2004), pp. 408–412, doi:10.1086/422884, Bibcode2004ApJS..154..408D.

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