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Epsilon Doradus - Wikipedia

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Epsilon Doradus
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ε Doradus (circled)
Constellation	Dorado
Right ascension	05^h 49^m 53.52107^s^[1]
Declination	−66° 54′ 04.2787″^[1]
Apparent magnitude (V)	5.11^[2]
Characteristics
Spectral type	B6 V^[3]
U−B color index	−0.49^[2]
B−V color index	−0.14^[2]
Variable type	SPB^[4]
Astrometry

Radial velocity (R_v)	+15.5±1.6^[5] km/s
Proper motion (μ)	RA: −21.81^[1] mas/yr Dec.: +37.55^[1] mas/yr
Parallax (π)	5.68 ± 0.15 mas^[1]
Distance	570 ± 20 ly (176 ± 5 pc)
Absolute magnitude (M_V)	−0.20^[6]

Details

Mass	4.31±0.05^[7] `M`_☉
Radius	3.8±0.6^[4] `R`_☉
Luminosity	556^[7] `L`_☉
Surface gravity (log g)	3.89±0.20^[4] cgs
Temperature	13,212^[7] K
Rotational velocity (v sin i)	17^[7] km/s
Age	210^[6] Myr

Other designations
ε Dor, CD−66°351, Gaia DR2 4659664312127365632, HD 39844, HIP 27534, HR 2064, SAO 249368, 2MASS J05495356-6654041^[8]
Database references
SIMBAD	data

Epsilon Doradus, Latinized from ε Doradus, is a solitary^[9] star located in the southern constellation of Dorado. It is visible to the naked eye with an apparent visual magnitude of 5.11.^[2] Based upon an annual parallax shift of 5.68 mas as measured from Earth, it is located roughly 570 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.09 due to interstellar dust.^[6]

This is a B-type main sequence star with a stellar classification of B6 V.^[3] It is a slowly pulsating B-type star with a mean longitudinal magnetic field strength of −64±26 G.^[4] With 4.31^[7] times the mass of the Sun and 3.8^[4] times the Sun's radius, it is about 85% of the way through its main sequence lifetime.^[7] The star is an estimated 210^[6] million years old and is spinning with a projected rotational velocity of 17 km/s.^[7] Epsilon Doradus radiates 556 times the solar luminosity from its photosphere at an effective temperature of 13,212 K.^[7]

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c ^d Johnson, H. L. (1966), "UBVRIJKL Photometry of the Bright Stars", Communications of the Lunar and Planetary Laboratory, 4: 99, Bibcode:1966CoLPL...4...99J.
^ ^a ^b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
^ ^a ^b ^c ^d ^e Hubrig, S.; et al. (April 2009), "New magnetic field measurements of β Cephei stars and slowly pulsating B stars", Astronomische Nachrichten, 330 (4): 317, arXiv:0902.1314, Bibcode:2009AN....330..317H, doi:10.1002/asna.200811187, S2CID 17497112.
^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ ^a ^b ^c ^d Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
^ ^a ^b ^c ^d ^e ^f ^g ^h Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ "eps Dor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-04-14.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

Constellation of Dorado

Stars

Bayer	α β γ δ ε ζ η¹ η² θ κ λ ν π¹ π² G
Variable	R (P) S WZ AB BB
HR	1859 2102
HD	27274 28254 30177 33579 37836 37974 38282 269810 271182
Other	B90 BAT99-7 BAT99-66 BAT99-68 BAT99-98 BAT99-104 BAT99-123 BI 253 Gliese 163 HE 0437-5439 HV 888 IRAS 05280–6910 LHA 120-S 79 LH 41-1042 LH 54-425 LMC195-1 MACHO 80.7443.1718 Melnick 34 Melnick 42 PSR J0523−7125 PSR J0537−6910 PSR J0540−6919 R85 R99 R136 a a1 a2 a3 b c R139 R145 SGR 0525−66 TOI-700 TOI-813 VFTS 102 VFTS 243 VFTS 352 VFTS 682 WASP-62 (Naledi) WOH G64

Exoplanets	Gliese 163 c HD 28254 b HD 30177 b TOI-700 d e TOI-813 b TOI-4127 b

Star
clusters

NGC	1712 1712 1755 1761 1763 1783 1806 1818 1820 1846 1847 1850 1852 1854/1855 1856 1858 1859 1860 1866 1868 1869 1871 1872 1873 1898 1901 1903 1910 1929 1935 1955 1969 1971 1974 1978 1983 1984 1994 1997 2001 2002 2003 2004 2027 2040 2070 2074 2100 2108 2164 2197 2241 2257
Other	Hodge 301 LH 95

Nebulae

NGC	1934 1936 2014 2020 2029 2032 2060 2078 2080
Other	Henize 70 Honeycomb Nebula N119 N11 N41 N44 N49 N55 SNR 0509-67.5 Tarantula Nebula (30)

Galaxies

NGC	1533 1549 1553 1566 1672 1892 1947 2082
Other	Large Magellanic Cloud (partly in Mensa and Hydrus) LEDA 89996

Galaxy clusters	Dorado Group NGC 1566 Group

Astronomical events	GRB 790305b SN 1987A