Minkar
Star Minkar |
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AladinLite | |||||||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Crow | ||||||||||||||||||||
Right ascension | 12 h 10 m 7.48 s | ||||||||||||||||||||
declination | -22 ° 37 ′ 11.2 ″ | ||||||||||||||||||||
Apparent brightness | 2.98 likes | ||||||||||||||||||||
Typing | |||||||||||||||||||||
B − V color index | 1.33 | ||||||||||||||||||||
U − B color index | 1.47 | ||||||||||||||||||||
R − I index | 0.64 | ||||||||||||||||||||
Spectral class | K2 + IIIa | ||||||||||||||||||||
Astrometry | |||||||||||||||||||||
Radial velocity | 5.00 ± 0.40 km / s | ||||||||||||||||||||
parallax | 12.50 ± 0.44 mas | ||||||||||||||||||||
distance | 260 ± 10 ly 80 pc |
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Proper movement | |||||||||||||||||||||
Rec. Share: | (−71.00 ± 0.70) mas / a | ||||||||||||||||||||
Dec. portion: | (11.84 ± 0.76) mas / a | ||||||||||||||||||||
Physical Properties | |||||||||||||||||||||
Dimensions | 3 M ☉ | ||||||||||||||||||||
radius | 43 R ☉ | ||||||||||||||||||||
Effective temperature | 4320 K | ||||||||||||||||||||
Metallicity [Fe / H] | -0.13 | ||||||||||||||||||||
Other names and catalog entries |
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Epsilon Corvi (ε Corvi ) is a star of the spectral class K2 III. His proper name is Minkar . It is located in the constellation Raven and has an apparent magnitude of +3.0 mag. With a diameter of 43 times the sun, Minkar is one of the red-orange giant stars . Its distance from Earth is about 260 light years or 80 parsec .
nomenclature
Minkar (from the arab. منقار minqār ) is the proper name of the star and translated means beak (of the raven).
properties
Epsilon Corvi is a star of the spectral class K2 III. It is a red-orange giant star. It has almost used up its hydrogen supply for nuclear fusion. As a result, its outer sheaths have expanded significantly. It has about three times the mass of the sun. The visual star diameter was measured using interferometric methods to be 4.99 milli-arcseconds. The calculated distance results in an approx. 43-fold solar radius. The effective temperature of its photosphere is 4320 K. That is why the star glows in organic light, which is typical for a star of the spectral class K. In the past, the star was roughly four times as massive as the sun. During this time it was a B5 V main sequence star.
Individual evidence
- ↑ a b c d e f g h i j k eps Crv. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 4, 2018 .
- ↑ CHF Melo et al .: On the nature of lithium-rich giant stars. Constraints from beryllium abundances. In: Astronomy and Astrophysics. 439 (1), August 2005, pp. 227-235, arXiv : astro-ph / 0504133 , 2005A & A ... 439..227M , doi: 10.1051 / 0004-6361: 20041805
- ↑ A. Richichi, I. Percheron, M. Khristoforova: Charm2: An updated Catalog of High Angular Resolution Measurements. In: Astronomy and Astrophysics. 431, February 2005, pp. 773-777, 2005A & A ... 431..773R , doi: 10.1051 / 0004-6361: 20042039
- ↑ Kenneth R. Lang: Astrophysical formulas. (= Astronomy and astrophysics library. 1). 3. Edition. Birkhäuser, 2006, ISBN 3-540-29692-1 . The radius (R * ) is defined by:
- ↑ James Kaler: Minkar. In: http://stars.astro.illinois.edu/ . Retrieved August 16, 2018 .