Astronomy:HD 191984

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Short description: Double star in the constellation Aquila
HD 191984
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Aquila[1]
A
Right ascension  20h 12m 35.12414s[2]
Declination +00° 52′ 01.3827″[2]
Apparent magnitude (V) 6.246[3]
B
Right ascension  20h 12m 35.04446s[4]
Declination +00° 51′ 58.9646″[4]
Apparent magnitude (V) 6.246[3]
Characteristics
Spectral type B9p CR(EU SR)[5] + A0[6]
U−B color index −0.033[3]
B−V color index +0.090[3]
Astrometry
A
Radial velocity (Rv)−19.0[7] km/s
Proper motion (μ) RA: +1.577[2] mas/yr
Dec.: −21.256[2] mas/yr
Parallax (π)6.4490 ± 0.0534[2] mas
Distance506 ± 4 ly
(155 ± 1 pc)
B
Radial velocity (Rv)−21.0[7] km/s
Proper motion (μ) RA: +4.733[4] mas/yr
Dec.: −17.988[4] mas/yr
Parallax (π)6.5263 ± 0.0318[4] mas
Distance500 ± 2 ly
(153.2 ± 0.7 pc)
Details
A
Mass2.6[2] M☉
Radius2.5[2] R☉
Luminosity60[2] L☉
Surface gravity (log g)3.96[2] cgs
Temperature10,497[2] K
Metallicity [Fe/H]−1.00[2] dex
Rotational velocity (v sin i)150[8] km/s
Age262[2] Myr
B
Mass2.2[4] M☉
Radius2.3[4] R☉
Luminosity31[4] L☉
Surface gravity (log g)3.87[4] cgs
Temperature8,801[4] K
Age574[4] Myr
Other designations
BD+00°4444, HD 191984, HIP 99585, HR 7717.
Database references
SIMBADdata
A
B

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°.[9]

References

  1. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A 
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 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 
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C 
  6. ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R, https://zenodo.org/record/890529 
  7. ↑ 7.0 7.1 Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Washington (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W 
  8. ↑ 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, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A 
  9. ↑ Mason, Brian D. et al. (May 2012), "Speckle Interferometry at the U.S. Naval Observatory. XVIII", The Astronomical Journal 143 (5): 6, doi:10.1088/0004-6256/143/5/124, 124, Bibcode: 2012AJ....143..124M, https://apps.dtic.mil/sti/pdfs/ADA561759.pdf 




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