HD 89998

HD 89998
Observation data Epoch J2000 Equinox J2000
Constellation	Vela
Right ascension	10^h 22^m 19.58477^s^[1]
Declination	−41° 38′ 59.8592″^[1]
Apparent magnitude (V)	4.82^[2]
Characteristics
Spectral type	K1 III^[3]
B−V color index	1.095±0.055^[2]
Astrometry

Radial velocity (R_v)	+20.9±0.8^[4] km/s
Proper motion (μ)	RA: −27.664^[1] mas/yr Dec.: +60.090^[1] mas/yr
Parallax (π)	15.9154 ± 0.1375 mas^[1]
Distance	205 ± 2 ly (62.8 ± 0.5 pc)
Absolute magnitude (M_V)	0.84^[2]

Details

Radius	11.6^[5] `R`_☉
Luminosity	54.04^[6] `L`_☉
Temperature	4,812^[6] K

Other designations
r Vel, NSV 4837, CD−41° 5809, FK5 1268, HD 89998, HIP 50799, HR 4080, SAO 221998^[7]
Database references
SIMBAD	data

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] The distance to HD 89998, as determined from its annual parallax shift of 15.9 mas,^[1] is 205 light years. The star is moving further from the Earth with a heliocentric radial velocity of +21 km/s,^[4] having come within 140 ly some 1.552 million years ago.^[2]

This is an evolved giant star with a stellar classification of K1 III.^[3] The measured angular diameter of this star, after correcting for limb darkening, is 1.72±0.02 mas.^[9] At the estimated distance of this star, this yields a physical size of 11.6 times the radius of the Sun.^[5] It is radiating 54^[6] times the Sun's luminosity from its enlarged photosphere at en effective temperature of 4,812 K.^[6]

References

^ ^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, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 62.8\cdot 1.72)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 23.2\cdot R_{\bigodot }\end{aligned}}$
^ ^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.

Constellation of Vela

Stars

Bayer	γ (Regor) δ (Alsephina) κ (Markeb) λ (Suhail) μ ο φ (Tseen Ke) ψ
Variable	R S T W RZ SV SW SX WY AF AH AI AL AO AP AX CS CU CV FY FZ GK GP (X-1) GU (F) GX GY GZ HU HV (E) HW HX HY HZ IM IP IS IU IV IW IY IZ KK KL KQ KT KX (f) LN LR LW MV (J) MX NN NO NX NY NZ OP OU PV OY QZ V335 V361 V382
HR	3178 3187 3204 3227 3234 3247 3250 3256 3294 (B) 3300 3330 3341 3356 3358 (A) 3359 3363 3371 3375 3382 3386 3388 3389 3390 3399 3404 3407 (C) 3426 (e) 3435 3444 3445 (b) 3448 3452 (n) 3453 3476 (D) 3477 (d) 3487 (a) 3488 3496 3497 3501 3503 3514 (h) 3520 (g) 3525 3535 3539 3542 3548 3551 3570 3574 (H) 3983 3591 (w) 3602 3611 3614 (c) 3629 3647 3656 3658 3667 3668 3670 3672 3674 (z) 3677 (k<sup>1</sup>) 3679 3680 3682 (l) 3684 (k) 3688 3692 3694 3700 3703 (K) 3716 3717 3726 3730 3732 3735 3737 3739 3746 3753 (I) 3784 3803 (N) 3807 3817 3819 (L) 3831 3836 (M) 3837 3840 3842 (y) 3868 3875 (O) 3886 3895 3898 (u) 3904 3910 3912 (m) 3925 3927 3930 3935 3943 3953 3955 3964 3976 3990 (Q) 4001 4010 4020 4023 (q) 4036 4038 4056 4061 4066 4080 (r) 4087 4093 4099 4107 4111 4134 4135 (s) 4136 4139 4143 (t) 4154 4167 (p) 4175 4180 (x) 4221 4292 4293 (i) 4296 4311 4316
HD	67621 68478 68763 69168 69404 70309 71805 72752 72798 73526 74438 75989 76004 78005 79091 81347 81369 83443 (Kalausi) 85390 (Natasha) 85512 87122 87652 88015 88862 89328 92155 93385 93453 94508 94724 95338 95509
Other	DENIS J082303.1−491201 Gliese 367 GJ 1132 GRS 1009-45 HH 46 IRS IGR J08408−4503 IRAS 08544−4431 LSS 2018 Luhman 16 PSR B1055−52 PSR J0855−4644 RX J0925.7−4758 2S 0918-549 WASP-19 WR 12

Exoplanets	GJ 1132 b HD 73526 b c HD 75289 b HD 85390 b HD 83443 b WASP-19b

Star
clusters

NGC	2547 2659 3201 3228
Other	IC 2391 IC 2395 IC 2488 RCW 38 Trumpler 10

Nebulae	Gum 15 HH 46/47 NGC 2626 NGC 2736 NGC 2899 NGC 3132 RCW 34 Vela Supernova Remnant

Galaxies

NGC	3256

Galaxy clusters	Vela Supercluster

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References