HD 187734
| 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☉ |
| Luminosity | 3,339[6] L☉ |
| Temperature | 4,128[6] K |
| Age | 29.0±3.4 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References
- ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304
- ^ a b Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
- ^ a b Abt, H. A. (September 1985), "Visual multiples. VIII. 1000 MK types", Astrophysical Journal Supplement Series, 59: 95–112, Bibcode:1985ApJS...59...95A, doi:10.1086/191064
- ^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352
