68_Aquilae Knowpia

68 Aquilae
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	20h 28m 24.90515s
Declination	–03° 21′ 28.0518″
Apparent magnitude (V)	6.12
Characteristics
Evolutionary stage	main sequence
Spectral type	B9 V
U−B color index	–0.20
B−V color index	–0.06
Astrometry
Radial velocity (Rv)	–9 km/s
Proper motion (μ)	RA: +27.02 mas/yr ; Dec.: –20.53 mas/yr
Parallax (π)	5.41 ± 0.42 mas
Distance	600 ± 50 ly ; (180 ± 10 pc)
Details
Mass	3.16±0.12 M☉
Luminosity	159.8+29.9; −25.2 L☉
Temperature	10,641+50; −49 K
Rotational velocity (v sin i)	138 km/s
Other designations
	68 Aql, BD−03° 4906, HD 194939, HIP 100977, HR 7821, SAO 144468
Database references
SIMBAD	data

68 Aquilae (abbreviated 68 Aql) is a double star in the equatorial constellation of Aquila. 68 Aquilae is its Flamsteed designation. Its apparent magnitude is 6.12.

References edit

^ ^a ^b ^c ^d ^e van Leeuwen, F. (November 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 ^d Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
^ ^a ^b ^c ^d Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
^ "68 Aql -- Star in double system", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-26.

Observation data Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	20^h 28^m 24.90515^s^[1]
Declination	–03° 21′ 28.0518″^[1]
Apparent magnitude (V)	6.12^[2]
Characteristics
Evolutionary stage	main sequence^[3]
Spectral type	B9 V^[2]
U−B color index	–0.20^[2]
B−V color index	–0.06^[2]
Astrometry

Radial velocity (R_v)	–9^[4] km/s
Proper motion (μ)	RA: +27.02^[1] mas/yr Dec.: –20.53^[1] mas/yr
Parallax (π)	5.41 ± 0.42 mas^[1]
Distance	600 ± 50 ly (180 ± 10 pc)

Details

Mass	3.16±0.12^[3] `M`_☉
Luminosity	159.8+29.9 −25.2^[3] `L`_☉
Temperature	10,641+50 −49^[3] K
Rotational velocity (v sin i)	138^[5] km/s

Other designations
68 Aql, BD−03° 4906, HD 194939, HIP 100977, HR 7821, SAO 144468^[6]
Database references
SIMBAD	data