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 | |
| 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 measurements by Hipparcos put it at a distance of some 500 light-years, or 150 parsecs away.[4]
References
- 1 2 3 4 5 6 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.
- 1 2 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.
- ↑ 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:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 3 4 van Leeuwen, F.; et al. (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.
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