HD 94510

HD 94510 is a single[9] star in the southern constellation of Carina, positioned near the northern constellation border with Vela. It has the Bayer designation u Carinae; HD 94520 is the identifier from the Henry Draper Catalogue. This object has an orange hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around +3.78.[2]. The star is located at a distance of 95 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +8 km/s.[2]

This article is about u Carinae. For U Carinae, see HD 95109.
HD 94510
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension  10h 53m 29.65524s[1]
Declination −58° 51′ 11.4163″[1]
Apparent magnitude (V) +3.78[2] (3.75 – 3.80)[3]
Characteristics
Evolutionary stage subgiant[4]
Spectral type K0IV[5]
B−V color index +0.945±0.005[2]
Variable type suspected
Astrometry
Radial velocity (Rv)+8.10±0.70[2] km/s
Proper motion (μ) RA: +79.01±0.13[1] mas/yr
Dec.: +38.47±0.12[1] mas/yr
Parallax (π)34.33 ± 0.13[1] mas
Distance95.0 ± 0.4 ly
(29.1 ± 0.1 pc)
Absolute magnitude (MV)1.46[2]
Details
Mass1.60[4] M☉
Radius7.55+0.93
−0.12[6] R☉
Luminosity30.96±0.27[6] L☉
Surface gravity (log g)3.00[7] cgs
Temperature4,955+41
−80[6] K
Metallicity [Fe/H]−0.13[2] dex
Other designations
u Car, NSV 5011, CPD−58°2834, GC 14980, HD 94510, HIP 53253, HR 4257, SAO 238574, CCDM J10535-5851[8]
Database references
SIMBADdata

This is a K-type star in the subgiant[4] stage with a stellar classification of K0IV,[5] which indicates it has exhausted the supply of hydrogen at its core and is evolving into a giant. HD 94510 is a suspected variable star with a brightness that has been measured varying from magnitude 3.75 down to 3.80.[3] It has an estimated 1.60[4] times the mass of the Sun and has expanded to nearly eight[6] times the Sun's radius. The star is radiating 31 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,955 K.[6]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 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.
  3. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S.
  4. Edvardsson, B. (January 1988), "Spectroscopic surface gravities and chemical compositions for 8 nearby single sub-giants.", Astronomy and Astrophysics, 190: 148–166, Bibcode:1988A&A...190..148E.
  5. Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  6. 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.
  7. Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, arXiv:1503.02556, Bibcode:2015MNRAS.448.2749A, doi:10.1093/mnras/stv189.
  8. "HD 94510". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-10.
  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.
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