HD 187734
Star in the constellation Aquila
From Wikipedia, the free encyclopedia
HD 187734 is double star in the equatorial constellation of Aquila. The primary is a magnitude 6.6 giant star, while the companion is a magnitude 9.4 A-type main sequence star.[4] As of 2014, the pair had an angular separation of 5″ along a position angle of 99°.[3]
Right ascension19h 51m 26.84135s[1]
Declination+04° 05′ 19.0767″[1]
Apparentmagnitude(V)6.6242±0.0012[2] (6.71 + 9.42)[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 51m 26.84135s[1] |
| Declination | +04° 05′ 19.0767″[1] |
| Apparent magnitude (V) | 6.6242±0.0012[2] (6.71 + 9.42)[3] |
| Characteristics | |
| Spectral type | K2III + A5V[4] |
| Astrometry | |
| Radial velocity (Rv) | −3.70±0.21[2] km/s |
| Proper motion (μ) | RA: −1.70[1] mas/yr Dec.: −5.82[1] mas/yr |
| Parallax (π) | 1.31±0.86 mas[1] |
| Distance | approx. 2,000 ly (approx. 800 pc) |
| Details | |
| HD 187734 A | |
| Mass | 8.8±0.1[5] M☉ |
| Radius | 109[6] R☉ |
| Luminosity | 3,339[7] L☉ |
| Surface gravity (log g) | 1.17[6] cgs |
| Temperature | 4,128[7] K |
| Age | 29.0±3.4 Myr |
| HD 187734 B | |
| Mass | 2.7[8] M☉ |
| Radius | 3.1[8] R☉ |
| Luminosity | 100[8] L☉ |
| Surface gravity (log g) | 3.89[8] cgs |
| Temperature | 10.312[8] K |
| Other designations | |
| BD+03°4172, HD 188385, HIP 97709, SAO 125141, WDS J19514+0405 | |
| Database references | |
| SIMBAD | data |
| B | |
