Star in the constellation Dorado
For other stars with this Bayer designation, see
η Doradus .
Eta2 Doradus Observation dataEpoch J2000.0 Equinox J2000.0 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−Vcolor index 1.599[ 1] Astrometry Radial velocity (Rv )± 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 mas [ 2] Distance 580 ± 20 ly 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 +313 [ 2] K Metallicity [Fe/H] −0.13[ 4] dex Other designations η2 Dor ,CPD −65°561FK5 2473GC 7946HD 43455HIP 29353HR 2245SAO 249469PPM 355229TYC 8901-1098-1[ 5] Database references SIMBAD data
Eta2 Doradus ,Latinized fromη2 Doradus , is astar in the southernconstellation ofDorado . It is visible to the naked eye as a dim, reddish star with anapparent visual magnitude of 5.01[ 1] parallax , and its net movement is one of receding, having aradial velocity of +34.5 km/s.[ 1] circumpolar south of latitude 24° 24′ S.[ 6]
This object is anM-type giant star , with itsstellar classification being M2.5III.[ 1] [ 7] main sequence after exhausting its core hydrogen and expanded to around 80 R ☉ Sun's luminosity from itsphotosphere , at aneffective temperature ofK [ 2]
^a b c d e f g h i 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 . XHIP record for this object atVizieR .^a b c d e f g h i 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 atVizieR .^ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun".The Astronomical Journal .104 : 275.Bibcode :1992AJ....104..275E .doi :10.1086/116239 . ^a b c Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost".Astronomy and Astrophysics .691 : A98.arXiv :2407.06963 Bibcode :2024A&A...691A..98K .doi :10.1051/0004-6361/202451427 . ^ "HD 43455" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedSeptember 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 .
