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 mas[1]
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

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  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data.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. ^ a b c d e f g h 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.{{citation}}: CS1 maint: postscript (link)
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