| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 55m 19.50021s[1] |
| Declination | −06° 44′ 05.2223″[1] |
| Apparent magnitude (V) | 6.51[2] (6.94 + 7.98)[3] |
| Characteristics | |
| Spectral type | F2V[3] |
| U−B color index | +0.05[2] |
| B−V color index | +0.39[2] |
| Astrometry | |
| Radial velocity (Rv) | −13.10[4] km/s |
| Proper motion (μ) | RA: +16.58[1] mas/yr Dec.: −60.18[1] mas/yr |
| Parallax (π) | 12.22 ± 0.84 mas[1] |
| Distance | 270 ± 20 ly (82 ± 6 pc) |
| Orbit[5] | |
| Period (P) | 425 ± 22 yr |
| Semi-major axis (a) | 1.085 ± 0.024″ |
| Eccentricity (e) | 0.9414 ± 0.0020 |
| Inclination (i) | 103.05 ± 0.84° |
| Longitude of the node (Ω) | 264.03 ± 0.77° |
| Periastron epoch (T) | B 1974.28 ± 0.23 |
| Argument of periastron (ω) (secondary) | 327.9 ± 1.7° |
| Details | |
| HD 188405 A | |
| Mass | 1.4[6] M☉ |
| Radius | 2.8[6] R☉ |
| Luminosity | 13[6] L☉ |
| Temperature | 6,646[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 188405 is a binary star in the equatorial constellation of Aquila. The pair have an orbital period of roughly 425 years and an angular separation of 1.085″.[7]
References
[edit]- ^ 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 c Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N
- ^ a b Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
- ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 21 May 2017.
- ^ a b c d Chandler, Colin Orion; McDonald, Iain; Kane, Stephen R. (2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal. 151 (3): 59. arXiv:1510.05666. Bibcode:2016AJ....151...59C. doi:10.3847/0004-6256/151/3/59. S2CID 119246448.
- ^ Cvetkovic, Z.; Ninkovic, S. (2010), "On the Component Masses of Visual Binaries", Serbian Astronomical Journal, 180 (180): 71–80, Bibcode:2010SerAJ.180...71C, doi:10.2298/SAJ1080071C
External links
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