HD 223311

HD 223311 is a star in the equatorial constellation of Aquarius. It has an orange hue and is visible to the naked eye as a dim star with an apparent visual magnitude of 6.08.[2] Based on parallax measurements, the star is located at a distance of approximately 910 light years from the Sun. It is a radial velocity standard[9] star that is drifting closer to the Sun at the rate of −20 km/s.[3] The star is situated near the ecliptic and thus is subject to lunar occultations.[10]

HD 223311
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension  23h 48m 32.47911s[1]
Declination −06° 22′ 49.5328″[1]
Apparent magnitude (V) 6.08[2]
Characteristics
Spectral type K4III[3]
U−B color index +1.71[2]
B−V color index +1.452[3]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−20.069±0.008[3] km/s
Proper motion (μ) RA: +0.01[5] mas/yr
Dec.: −19.04[5] mas/yr
Parallax (π)3.5950 ± 0.0884[1] mas
Distance910 ± 20 ly
(278 ± 7 pc)
Absolute magnitude (MV)−0.80[6]
Details
Radius40.78+3.27
−7.51[1] R☉
Luminosity496±15[1] L☉
Temperature4,267+457
−162[1] K
Metallicity [Fe/H]−0.22±0.09[7] dex
Other designations
NSV 14715, BD−07°6086, FK5 3912, HD 223311, HIP 117420, HR 9014, SAO 146919[8]
Database references
SIMBADdata

This is an aging K-type giant star with a stellar classification of K4III.[3] Having exhausted the supply of hydrogen at its core, it has cooled and expanded off the main sequence. At present it has 41[1] times the girth of the Sun. It is a suspected variable star of unknown type that has been measured ranging in brightness from magnitude 5.01 down to 5.26 in the infrared I band.[4] The star is radiating 496 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,267 K.[1]

References
  1. 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.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. Soubiran, C.; et al. (April 2013), "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release", Astronomy & Astrophysics, 552: 11, arXiv:1302.1905, Bibcode:2013A&A...552A..64S, doi:10.1051/0004-6361/201220927, A64.
  4. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085.
  5. 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.
  6. 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.
  7. Taylor, B. J. (February 1999), "Catalogs of temperatures and [Fe/H] averages for evolved G and K stars", Astronomy and Astrophysics Supplement, 134 (3): 523–524, Bibcode:1999A&AS..134..523T, doi:10.1051/aas:1999153.
  8. "HD 223311". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-16.
  9. Crifo, F.; et al. (December 2010), "Towards a new full-sky list of radial velocity standard stars", Astronomy and Astrophysics, 524: 8, arXiv:1010.0613, Bibcode:2010A&A...524A..10C, doi:10.1051/0004-6361/201015315, A10.
  10. Blow, G. L.; et al. (November 1982), "Photoelectric observations of lunar occultations. XIII", Astronomical Journal, 87: 1571–1584, Bibcode:1982AJ.....87.1571B, doi:10.1086/113247.
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