HD 188405

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]

HD 188405
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[1] mas
Distance270 ± 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
Mass1.4[6] M☉
Radius2.8[6] R☉
Luminosity13[6] L☉
Temperature6,646[6] K
Other designations
BD-07° 5102, HD 188405, HIP 98038, HR 7599, SAO 143911.
Database references
SIMBADdata

References
  1. 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
  2. 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
  3. 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
  4. 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.
  5. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 21 May 2017.
  6. 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.
  7. Cvetkovic, Z.; Ninkovic, S. (2010), "On the Component Masses of Visual Binaries", Serbian Astronomical Journal, 180: 71–80, Bibcode:2010SerAJ.180...71C, doi:10.2298/SAJ1080071C
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