HD 221148

HD 221148 is suspected variable star in the equatorial constellation of Aquarius. The spectrum of the star shows exceptionally strong levels of CN; one of the highest cyanogen indices measured.[4]

HD 221148
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 29m 32.08207s[1]
Declination −04° 31′ 57.8915″[1]
Apparent magnitude (V) 6.26[2]
Characteristics
Spectral type K3IIIv[3]
U−B color index +1.20[2]
B−V color index +1.10[2]
Astrometry
Radial velocity (Rv)−26.53±1.94[3] km/s
Proper motion (μ) RA: +181.03[1] mas/yr
Dec.: −232.23[1] mas/yr
Parallax (π)21.14 ± 0.56[1] mas
Distance154 ± 4 ly
(47 ± 1 pc)
Details
Radius5[3] R☉
Luminosity8.9[3] L☉
Surface gravity (log g)3.1[3] cgs
Temperature4,592[3] K
Metallicity [Fe/H]+0.11[3] dex
Rotational velocity (v sin i)2.2[3] km/s
Other designations
BD-05° 5999, FK5 3881, HD 221148, HIP 115953, HR 8924, LTT 9560, SAO 146736.
Database references
SIMBADdata

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. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  3. Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
  4. Janes, K. A. (May 1975), "Cyanogen Strengths, Luminosities, and Kinematics of K Giant Stars", Astrophysical Journal Supplement, 29: 161–183, Bibcode:1975ApJS...29..161J, doi:10.1086/190339. See p. 179.


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