HD 89998

HD 89998
Observation data; Epoch J2000 Equinox J2000
Constellation	Vela
Right ascension	10h 22m 19.58477s
Declination	−41° 38′ 59.8592″
Apparent magnitude (V)	4.82
Characteristics
Spectral type	K1 III
B−V color index	1.095±0.055
Astrometry
Radial velocity (Rv)	+20.9±0.8 km/s
Proper motion (μ)	RA: −27.664 mas/yr ; Dec.: +60.090 mas/yr
Parallax (π)	15.9154±0.1375 mas
Distance	205 ± 2 ly ; (62.8 ± 0.5 pc)
Absolute magnitude (MV)	0.84
Details
Mass	1.9 M☉
Radius	11.0 R☉
Luminosity	56 L☉
Surface gravity (log g)	2.77 cgs
Temperature	4,761 K
Metallicity [Fe/H]	+0.12 dex
Rotational velocity (v sin i)	<1.0 km/s
Other designations
	r Vel, NSV 4837, CD−41°5809, FK5 1268, HD 89998, HIP 50799, HR 4080, SAO 221998
Database references
SIMBAD	data

HD 89998 (r Velorum) is a single^[9] 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.^[1] The distance to HD 89998, as determined from its annual parallax shift of 15.9 mas,^[2] 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.^[1]

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.^[10] At the estimated distance of this star, this yields a physical size of 11.6 times the radius of the Sun.^[11] It is radiating 56 times the Sun's luminosity from its enlarged photosphere at en effective temperature of 4,761 K.^[6]

References

^ ^a ^b ^c ^d ^e ^f 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. XHIP record for this object at VizieR.
^ ^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 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 ^c Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
^ ^a ^b ^c ^d Hon, Marc; Huber, Daniel; Kuszlewicz, James S.; Stello, Dennis; Sharma, Sanjib; Tayar, Jamie; Zinn, Joel C.; Vrard, Mathieu; Pinsonneault, Marc H. (2021). "A "Quick Look" at All-sky Galactic Archeology with TESS: 158,000 Oscillating Red Giants from the MIT Quick-look Pipeline". The Astrophysical Journal. 919 (2): 131. arXiv:2108.01241. Bibcode:2021ApJ...919..131H. doi:10.3847/1538-4357/ac14b1.
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
^ "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.
^ 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:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 62.8\cdot 1.72)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 23.2\cdot R_{\bigodot }\end{aligned}}$

[Anderson2012-1] ^ ^a ^b ^c ^d ^e ^f 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. XHIP record for this object at VizieR.

[GaiaDR2-2] ^ ^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.

[houk1978-3] 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.

[deBruijne2012-4] 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.

[khalatyan2024-5] Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.

[hon2021-6] Hon, Marc; Huber, Daniel; Kuszlewicz, James S.; Stello, Dennis; Sharma, Sanjib; Tayar, Jamie; Zinn, Joel C.; Vrard, Mathieu; Pinsonneault, Marc H. (2021). "A "Quick Look" at All-sky Galactic Archeology with TESS: 158,000 Oscillating Red Giants from the MIT Quick-look Pipeline". The Astrophysical Journal. 919 (2): 131. arXiv:2108.01241. Bibcode:2021ApJ...919..131H. doi:10.3847/1538-4357/ac14b1.

[demedeiros2014-7] De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.

[SIMBAD-8] "HD 85622". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-08.

[Eggleton2008-9] 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.

[Richichi2005-10] 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.

[lang2006-11] 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:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 62.8\cdot 1.72)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 23.2\cdot R_{\bigodot }\end{aligned}}$

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

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

Details

Mass	1.9^[5] `M`_☉
Radius	11.0^[6] `R`_☉
Luminosity	56^[6] `L`_☉
Surface gravity (log g)	2.77^[5] cgs
Temperature	4,761^[6] K
Metallicity [Fe/H]	+0.12^[5] dex
Rotational velocity (v sin i)	<1.0^[7] km/s

Other designations
r Vel, NSV 4837, CD−41°5809, FK5 1268, HD 89998, HIP 50799, HR 4080, SAO 221998^[8]
Database references
SIMBAD	data