HD 191984
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| 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 | |
| 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]
References
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