HD 191984

HD 191984
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
	A
Right ascension	20h 12m 35.12414s
Declination	+00° 52′ 01.3827″
Apparent magnitude (V)	6.246
	B
Right ascension	20h 12m 35.04446s
Declination	+00° 51′ 58.9646″
Apparent magnitude (V)	6.246
Characteristics
Spectral type	B9p CR(EU SR) + A0
U−B color index	−0.033
B−V color index	+0.090
Astrometry
A
Radial velocity (Rv)	−19.0 km/s
Proper motion (μ)	RA: +1.577 mas/yr ; Dec.: −21.256 mas/yr
Parallax (π)	6.4490±0.0534 mas
Distance	506 ± 4 ly ; (155 ± 1 pc)
B
Radial velocity (Rv)	−21.0 km/s
Proper motion (μ)	RA: +4.733 mas/yr ; Dec.: −17.988 mas/yr
Parallax (π)	6.5263 ± 0.0318 mas
Distance	500 ± 2 ly ; (153.2 ± 0.7 pc)
Details
A
Mass	2.6 M☉
Radius	2.5 R☉
Luminosity	60 L☉
Surface gravity (log g)	3.96 cgs
Temperature	10,497 K
Metallicity [Fe/H]	−1.00 dex
Rotational velocity (v sin i)	150 km/s
Age	262 Myr
B
Mass	2.2 M☉
Radius	2.3 R☉
Luminosity	31 L☉
Surface gravity (log g)	3.87 cgs
Temperature	8,801 K
Metallicity [Fe/H]	−1.42 dex
Age	574 Myr
Other designations
	BD+00°4444, HD 191984, HIP 99585, HR 7717.
Database references
SIMBAD	data
	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

^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c ^d 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
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ 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
^ ^a ^b Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Washington, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W
^ 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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[xhip-1] Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015

[dr3a-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[aaass47_221-3] 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

[dr3b-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[aj74_375-5] Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819

[aaa498_3_961-6] 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

[gcrv1953-7] Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Washington, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W

[apjs99_135-8] 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, Bibcode:1995ApJS...99..135A, doi:10.1086/192182

[aj143_5_124-9] 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

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Observation data Epoch J2000 Equinox J2000
Constellation	Aquila^[1]
A
Right ascension	20^h 12^m 35.12414^s^[2]
Declination	+00° 52′ 01.3827″^[2]
Apparent magnitude (V)	6.246^[3]
B
Right ascension	20^h 12^m 35.04446^s^[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 (R_v)	−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 mas^[2]
Distance	506 ± 4 ly (155 ± 1 pc)
B
Radial velocity (R_v)	−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 mas^[4]
Distance	500 ± 2 ly (153.2 ± 0.7 pc)
Details
A
Mass	2.6^[2] `M`_☉
Radius	2.5^[2] `R`_☉
Luminosity	60^[2] `L`_☉
Surface gravity (log g)	3.96^[2] cgs
Temperature	10,497^[2] K
Metallicity [Fe/H]	−1.00^[2] dex
Rotational velocity (v sin i)	150^[8] km/s
Age	262^[2] Myr
B
Mass	2.2^[4] `M`_☉
Radius	2.3^[4] `R`_☉
Luminosity	31^[4] `L`_☉
Surface gravity (log g)	3.87^[4] cgs
Temperature	8,801^[4] K
Metallicity [Fe/H]	−1.42^[4] dex
Age	574^[4] Myr
Other designations
BD+00°4444, HD 191984, HIP 99585, HR 7717.
Database references
SIMBAD	data
	A
	B

HD 191984

References

External links

zproxy.org