103 Aquarii

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103 Aquarii
Observation data
Epoch J2000.0 (ICRS)      Equinox J2000.0 (ICRS)
Constellation Aquarius
Right ascension 23h 41m 34.48853s[1]
Declination −18° 01′ 37.4731″[1]
Apparent magnitude (V) 5.34[2]
Spectral type K4/K5 III[3]
B−V color index +1.57[2]
Radial velocity (Rv)+25.1[4] km/s
Proper motion (μ) RA: –41.25[1] mas/yr
Dec.: –71.85[1] mas/yr
Parallax (π)4.31 ± 0.31[1] mas
Distance760 ± 50 ly
(230 ± 20 pc)
Surface gravity (log g)1.59[5] cgs
Temperature3,910[5] K
Metallicity [Fe/H]–0.18[5] dex
Other designations
BD−18° 6357, HD 222547, HIP 116889, HR 8980, SAO 165834.[6]
Database references

103 Aquarii (abbreviated 103 Aqr) is a star in the equatorial constellation of Aquarius. 103 Aquarii is the Flamsteed designation, although it also bears the Bayer designation A1 Aquarii.[7] It is faint but visible to the naked eye with an apparent visual magnitude of 5.34.[2] Based upon an annual parallax shift of 4.31 milliarcseconds, the distance to this star is around 760 light-years (230 parsecs).[1] This is classified as an evolved K-type giant star.[3]


  1. ^ a b c d e f van Leeuwen, F. (November 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. ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  3. ^ a b Houk, Nancy; Smith-Moore, M. (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, Ann Arbor: Dept. of Astronomy, University of Michigan, 4, Bibcode:1988mcts.book.....H.
  4. ^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Washington, Carnegie Institute of Washington, D.C.: 0, Bibcode:1953GCRV..C......0W.
  5. ^ a b c McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants". Astrophysical Journal Supplement Series. 74: 1075–1128. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527.
  6. ^ "103 Aqr -- Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-16
  7. ^ HD 222547, database record, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A.

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