Eta2 Doradus

Eta2 Doradus
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Dorado
Right ascension	06h 11m 15.0s
Declination	−65° 35′ 21.9″
Apparent magnitude (V)	5.01
Characteristics
Spectral type	M2.5III
B−V color index	1.599
Astrometry
Radial velocity (Rv)	+34.5±0.8 km/s
Proper motion (μ)	RA: -23.823 mas/yr ; Dec.: +118.639 mas/yr
Parallax (π)	5.6046 ± 0.1562 mas
Distance	580 ± 20 ly ; (178 ± 5 pc)
Absolute magnitude (MV)	−1.45
Details
Radius	81.89 R☉
Luminosity	1165 L☉
Surface gravity (log g)	0.403 cgs
Temperature	3,726+313; −154 K
Other designations
	η2 Dor, CPD−65°561, FK5 2473, GC 7946, HD 43455, HIP 29353, HR 2245, SAO 249469, PPM 355229, TYC 8901-1098-1
Database references
SIMBAD	data

Eta² Doradus, Latinized from η² Doradus, is a star in the southern constellation of Dorado. It is visible to the naked eye as a dim, reddish star with an apparent visual magnitude of 5.01^[2] It is about 580 light years from the Sun as shown by parallax, and its net movement is one of receding, having a radial velocity of +34.5 km/s.^[2] It is circumpolar south of latitude 24° 24′ S.^[5]

This object is an M-type giant star, with its stellar classification being M2.5III.^[2]^[6] It has left the main sequence after exhausting its core hydrogen and expanded to around 80 R_☉. The star is radiating about 1200^[1] times the Sun's luminosity from its photosphere, at an effective temperature of 3726 K.^[1]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h 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.
^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. S2CID 73594365.
^ "HD 43455". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 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.

External links

2004. Starry Night Pro, Version 5.8.4. Imaginova. ISBN 978-0-07-333666-4. www.starrynight.com

Zdroj:https://en.wikipedia.org?pojem=Eta2_Doradus
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[GaiaDR2-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.

[Anderson2012-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h 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.

[McDonald-3] McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. S2CID 73594365.

[sb0-4] "HD 43455". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 25, 2008.

[space.fm-5] "Circumpolar Calculations | Celestial Observation | Space FM".

[houk1978-6] 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.

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Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Dorado
Right ascension	06^h 11^m 15.0^s^[1]
Declination	−65° 35′ 21.9″^[1]
Apparent magnitude (V)	5.01^[2]
Characteristics
Spectral type	M2.5III^[2]
B−V color index	1.599^[2]
Astrometry

Radial velocity (R_v)	+34.5±0.8^[2] km/s
Proper motion (μ)	RA: -23.823^[1] mas/yr Dec.: +118.639^[1] mas/yr
Parallax (π)	5.6046 ± 0.1562 mas^[1]
Distance	580 ± 20 ly (178 ± 5 pc)
Absolute magnitude (M_V)	−1.45^[2]

Details

Radius	81.89^[1] `R`_☉
Luminosity	1165^[1] `L`_☉
Surface gravity (log g)	0.403^[3] cgs
Temperature	3,726+313 −154^[1] K

Other designations
η² Dor, CPD−65°561, FK5 2473, GC 7946, HD 43455, HIP 29353, HR 2245, SAO 249469, PPM 355229, TYC 8901-1098-1^[4]
Database references
SIMBAD	data