U Aquilae

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U Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 29m 21.3603s[1]
Declination −07° 02′ 38.710″[1]
Apparent magnitude (V) 6.61[1]
Characteristics
Spectral type F7-G1I-II+B9.8V[1]
U−B color index 0.70[1]
B−V color index 1.10[1]
Variable type classical Cepheid[2]
Astrometry
Radial velocity (Rv) -6.5[1] km/s
Proper motion (μ) RA: -0.99[1] mas/yr
Dec.: -9.14[1] mas/yr
Parallax (π) 3.63 ± 0.96[1] absmag_v=-0.79 mas
Distance approx. 900 ly
(approx. 280 pc)
Other designations
GCRV 11912, IDS 19240-0715 AB, TYC 5143-1372-1, KUI 91AB, IRAS 19266-0708, UBV M 23815, ADS 12503 AB, GSC 05143-01372, LS IV -07 35, UBV 21626, ALS 10306, HD 183344, 2MASS J19292135-0702387, uvby98 100183344 ABV, BD-07° 4968, HERZ 2291, PLX 4556, YZ 97 6771, CCDM J19294-0703AB, HIC 95820, PPM 202954, AAVSO 1924-07, CSI-07 4968 1, HIP 95820, SAO 143454, GC 26905, HR 7402.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

U Aquilae is a trinary star system[3] in the constellation Aquila. Located approximately 275 parsecs (900 ly) distant, the primary is a classical Cepheid variable ranging between magnitudes 6.08 and 6.86 over a period of 7.02 days,[2] while the secondary is a blue main-sequence star.[3]

References[edit]

  1. ^ a b c d e f g h i j "U Aquilae". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 1 July 2014. 
  2. ^ a b VSX (4 January 2010). "U Aql". AAVSO Website. American Association of Variable Star Observers. Retrieved 1 July 2014. 
  3. ^ a b Evans, Nancy Remage (2013). "BINARY CEPHEIDS: SEPARATIONS AND MASS RATIOS IN 5 M ☉ BINARIES". The Astronomical Journal 146 (4): 93. doi:10.1088/0004-6256/146/4/93.  edit