HD 221776

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HD 221776
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 34m 46.74220s[1]
Declination +38° 01′ 26.3950″[1]
Apparent magnitude (V) 6.18[2]
Spectral type K5III[2]
U−B color index +1.97[3]
B−V color index +1.586[2]
Radial velocity (Rv) −13.74±0.11[4] km/s
Proper motion (μ) RA: 10.37±0.32[1] mas/yr
Dec.: 10.59±0.23[1] mas/yr
Parallax (π) 4.30 ± 0.33[1] mas
Distance 760 ± 60 ly
(230 ± 20 pc)
Absolute magnitude (MV) −0.68[2]
Luminosity 451[5] L
Temperature 3,800[5] K
Other designations
BD+37° 4866, HD 221776, HIP 116365, HR 8950, SAO 73351.
Database references
Database references

HD 221776 is a double star in the northern constellation of Andromeda. It has an infrared excess, indicating the star is associated with a cloud of dust particles.[5] There is a magnitude 11.8 companion at angular separation of 19.8 along a position angle of 329°, as of 2002.[6]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752free to read, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 
  2. ^ a b c d Jasniewicz, G.; et al. (February 1999), "Late-type giants with infrared excess. I. Lithium abundances", Astronomy and Astrophysics, 342: 831–838, Bibcode:1999A&A...342..831J 
  3. ^ Guetter, H. H.; Hewitt, A. V. (June 1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Publications of the Astronomical Society of the Pacific, 96: 441−443, Bibcode:1984PASP...96..441G, doi:10.1086/131362 
  4. ^ Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165–186. arXiv:astro-ph/0409579free to read. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. 
  5. ^ a b c Kim, Sungsoo S.; et al. (April 2001), "Extent of Excess Far-Infrared Emission around Luminosity Class III Stars", The Astrophysical Journal, 550 (2): 1000−1006, arXiv:astro-ph/0012001free to read, Bibcode:2001ApJ...550.1000K, doi:10.1086/319803 
  6. ^ Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22 

External links[edit]