HD 191984

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HD 191984
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 20h 12m 35.1244s
Declination +00° 52′ 01.395″
Apparent magnitude (V) 6.27
Characteristics
Spectral type A0
U−B color index -0.01
B−V color index 0.02
Astrometry
Radial velocity (Rv) -19 km/s
Proper motion (μ) RA: 2.1 mas/yr
Dec.: -19.81 mas/yr
Parallax (π) 5.41 ± 1.55 mas
Distance approx. 600 ly
(approx. 180 pc)
Absolute magnitude (MV) 6.29
Details
Mass 3.1 M
Radius 2.1 R
Luminosity 40 L
Temperature 7,500–10,000 K
Other designations
BD+00° 4444, HIP 99585, HR 7717.
Database references
SIMBAD data
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

HD 191984, also catalogued as ADS 13506 B and HR 7717, is double or multiple star.

"Discordance as to which component has the peculiar spectrum usually attributed to A. However, on the basis of better spectrograms, Abt gives A = A0V, B = A0Vp(Sr,Cr st.,Ca wk.)."[1]

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