HD 188405

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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
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
Luminosity 13[6] L
Temperature 6,645[6] K
Other designations
BD-07° 5102, HD 188405, HIP 98038, HR 7599, SAO 143911.
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]

  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357 
  2. ^ 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 
  3. ^ 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 
  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. 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. ^ 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, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x 
  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 

External links[edit]