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Star in the constellation Vela
HD 89998 (r Velorum ) is a single[ 8] star in the southern constellation of Vela . It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.82.[ 2] parallax shift of mas [ 1] light years . The star is moving further from the Earth with a heliocentric radial velocity of +21 km/s,[ 4] [ 2]
This is an evolved giant star with a stellar classification of K1 III.[ 3] angular diameter of this star, after correcting for limb darkening, is ± 0.02 mas[ 9] radius of the Sun .[ 5] [ 6] Sun's luminosity from its enlarged photosphere at en effective temperature of 4,812 K.[ 6]
^ a b c d e f 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 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 . ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode :1978mcts.book.....H . ^ a b 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 Lang, Kenneth R. (2006), Astrophysical formulae ISBN 3-540-29692-1 * ) is given by:
2
⋅
R
∗
=
(
10
−
3
⋅
62.8
⋅
1.72
)
AU
0.0046491
AU
/
R
⨀
≈
23.2
⋅
R
⨀
{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 62.8\cdot 1.72)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 23.2\cdot R_{\bigodot }\end{aligned}}}
^ a b c d McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–357, arXiv :1208.2037 Bibcode :2012MNRAS.427..343M , doi :10.1111/j.1365-2966.2012.21873.x S2CID 118665352 . ^ "HD 85622" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2018-08-08 .^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869, arXiv :0806.2878 Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics , 431 (2): 773–777, Bibcode :2005A&A...431..773R , doi :10.1051/0004-6361:20042039
