HD_187734 Knowpia

HD 187734
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	19h 51m 26.84135s
Declination	+04° 05′ 19.0767″
Apparent magnitude (V)	6.6242±0.0012 (6.71 + 9.42)
Characteristics
Spectral type	K2III + A5V
Astrometry
Radial velocity (Rv)	−3.70±0.21 km/s
Proper motion (μ)	RA: -1.70 mas/yr ; Dec.: -5.82 mas/yr
Parallax (π)	1.31 ± 0.86 mas
Distance	approx. 2,000 ly ; (approx. 800 pc)
Details
HD 187734 A
Mass	8.8±0.1 M☉
Luminosity	3,339 L☉
Temperature	4,128 K
Age	29.0±3.4 Myr
Other designations
	BD+03° 4172, HD 188385, HIP 97709, SAO 125141, WDS J19514+0405.
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 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 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

Observation data Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	19^h 51^m 26.84135^s^[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 (R_v)	−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
BD+03° 4172, HD 188385, HIP 97709, SAO 125141, WDS J19514+0405.
Database references
SIMBAD	data