12 Aquarii

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12 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
12 Aqr A
Right ascension 21h 04m 04.719s[1]
Declination −05° 49′ 23.05″[1]
Apparent magnitude (V) 5.80[1]
12 Aqr B
Right ascension 21h 04m 04.679s[1]
Declination −05° 49′ 25.39″[1]
Apparent magnitude (V) 7.50[1]
Characteristics
Spectral type K0/1 III + A3 V[2]
Astrometry
Radial velocity (Rv) 1.10 ± 0.3[3] km/s
Proper motion (μ) RA: 20.35[4] mas/yr
Dec.: -6.67[4] mas/yr
Parallax (π) 6.50 ± 0.88[4] mas
Distance approx. 500 ly
(approx. 150 pc)
Other designations
BD−06° 5664, HIP 103981, ADS 14592, CCDM J21041-0549AB
12 Aqr A: HD 200497, HR 8059, SAO 145065
12 Aqr B: HD 200496, HR 8058, SAO 145064
Database references
SIMBAD 12 Aqr A
12 Aqr B

12 Aquarii (abbreviated 12 Aqr) is a double star in the constellation Aquarius. 12 Aquarii is the Flamsteed designation. It consists of a K-type giant and an A-type main-sequence star.[2] Parallax meausrements by Hipparcos put it at a distance of some 500 light-years, or 150 parsecs away.[4]

References[edit]

  1. ^ a b c d e f Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822. 
  2. ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H. 
  3. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  4. ^ a b c d van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.