HR 244

HR 244
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 00h 53m 04.19644s[1]
Declination +61° 07′ 26.2993″[1]
Apparent magnitude (V) 4.80[2]
Characteristics
Evolutionary stage subgiant[1]
Spectral type F9V[3]
B−V color index 0.540±0.008[4]
Astrometry
Radial velocity (Rv)+20.68±0.12[1] km/s
Proper motion (μ) RA: –68.298[1] mas/yr
Dec.: +169.435[1] mas/yr
Parallax (π)52.9017 ± 0.1037 mas[1]
Distance61.7 ± 0.1 ly
(18.90 ± 0.04 pc)
Absolute magnitude (MV)3.44[4]
Details
Mass1.194[5] M
Radius1.77[1] R
Luminosity3.7[1] L
Surface gravity (log g)0.53[2] cgs
Temperature5,986[1] K
Metallicity [Fe/H]0.04[5] dex
Rotational velocity (v sin i)8.1[2] km/s
Age5.3[5] Gyr
Other designations
BD+60°124, GJ 41, HD 5015, HIP 4151, HR 244, SAO 11444, WDS J00531+6107A[6]
Database references
SIMBADdata

HR 244 is a single[7] star in the constellation Cassiopeia. It has a yellow-white hue and is visible to the naked eye with an apparent visual magnitude of 4.80.[2] Based upon parallax measurements, it is located at a distance of 62 light years from the Sun, and is drifting further away with a radial velocity of +20.7 km/s;[1] around 546,000 years ago it passed within 38 light-years of the Sun.[4] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.183 arcseconds per annum.[8]

This object is an F-type star with a stellar classification of F9V.[3] Despite the spectral class, evolutionary models show it to have left the main sequence and is now a subgiant.[1] It is 5.3[5] billion years old and is spinning with a projected rotational velocity of 8 km/s.[2] The star has 1.2[5] times the mass of the Sun and 1.8[1] times the Sun's radius. It is radiating 3.7 times the luminosity of the Sun from its photosphere at an effective temperature of 5,986 K.[1]

References

  1. ^ a b c d e f g h i j k l m n Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d e Luck, R. Earle (January 2017), "Abundances in the Local Region II. F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, S2CID 119511744, 21.
  3. ^ a b Abt, Helmut A. (January 2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, 180 (1): 117–118, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117, S2CID 122811461.
  4. ^ a b c 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.
  5. ^ a b c d e Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 40, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, S2CID 14911430.
  6. ^ "HD 5015". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-02.
  7. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  8. ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.

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