HD 191984
(Redirected from HR 7717)
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 12m 35.12436s[1] |
| Declination | +00° 52′ 01.3864″[1] |
| Apparent magnitude (V) | 6.246[2] |
| Characteristics | |
| Spectral type | B9p CR(EU SR)[3] + A0[4] |
| U−B color index | −0.033[2] |
| B−V color index | +0.090[2] |
| Astrometry | |
| Radial velocity (Rv) | −19[5] km/s |
| Proper motion (μ) | RA: +2.12[1] mas/yr Dec.: −20.85[1] mas/yr |
| Parallax (π) | 5.54 ± 1.10 mas |
| Distance | approx. 600 ly (approx. 180 pc) |
| Details | |
| Luminosity | 82[6] L☉ |
| Temperature | 8,477[6] K |
| Rotational velocity (v sin i) | 150[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
HD 191984 is a double star in the equatorial constellation of Aquila. As of 2011, the components have an angular separation of 2.52″ along a position angle of 205.7°.[8]
References
[edit]- ^ a b c d 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
- ^ a b c Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode:1982A&AS...47..221R
- ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
- ^ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788
- ^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Washington, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W
- ^ a b McDonald, I.; Zijlstra, A. A; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
- ^ Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182
- ^ Mason, Brian D.; et al. (May 2012), "Speckle Interferometry at the U.S. Naval Observatory. XVIII" (PDF), The Astronomical Journal, 143 (5): 6, Bibcode:2012AJ....143..124M, doi:10.1088/0004-6256/143/5/124, 124, archived from the original on June 13, 2017
External links
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