Astronomy:HR 244

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Short description: Star in the constellation Cassiopeia
HR 244
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
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. Jump up to: 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. Jump up to: 2.0 2.1 2.2 2.3 2.4 Luck, R. Earle (January 2017), "Abundances in the Local Region II. F, G, and K Dwarfs and Subgiants", The Astronomical Journal 153 (1): 19, doi:10.3847/1538-3881/153/1/21, 21, Bibcode2017AJ....153...21L. 
  3. Jump up to: 3.0 3.1 Abt, Helmut A. (January 2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement 180 (1): 117–118, doi:10.1088/0067-0049/180/1/117, Bibcode2009ApJS..180..117A. 
  4. Jump up to: 4.0 4.1 4.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  5. Jump up to: 5.0 5.1 5.2 5.3 5.4 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, doi:10.1088/0004-637X/771/1/40, Bibcode2013ApJ...771...40B. 
  6. "HD 5015". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+5015. 
  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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E. 
  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, doi:10.1086/427854, Bibcode2005AJ....129.1483L.