HD 172044

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HD 172044 / BD+33°3154B[1][2]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 18h 36m 37.3435s / 18h 36m 36.9s
Declination +33° 28' 8.531" / +33° 28' 2"
Apparent magnitude (V) 5.410 / 10.7
Characteristics
Spectral type B8II-IIIp... / ?
U−B color index -0.51 / ?
B−V color index -0.09 / ?
Astrometry
Radial velocity (Rv) -26.3 / -27.4 km/s
Proper motion (μ) RA: -9.01 / ? mas/yr
Dec.: -0.39 / ? mas/yr
Parallax (π) 6.25 ± 0.53 mas
Distance 520 ± 40 ly
(160 ± 10 pc)
Orbit
Companion BD+33°3154B
Semi-major axis (a) 7.3"
Inclination (i) 205°
Other designations
HD 172044, HR 6997, BD+33°3154, SAO 67164, HIP 91235, GC 25443, CCDM J18366+3328, GSC 02641-02396
Database references
SIMBAD data

HD 172044 and BD+33°3154B are two components of a binary star system in the constellation Lyra, approximately 520 light years away from Earth. 5th magnitude HD 172044 is a giant or subgiant star with the spectral type B8II-IIIp... The "p..." signifies that the star has a peculiar spectrum and spectral peculiarities have yet to be described. It is bluish white in color and has a surface temperature of 11,000 to 25,000 kelvins. It is therefore at least twice as hot as our Sun on its surface, and many times brighter and larger in size.[1] BD+33°3154B is an 11th magnitude star of an unknown spectral type.[2]

References[edit]

  1. ^ a b "Simbad Query Result". Simbad. Retrieved October 16, 2007. 
  2. ^ a b "Simbad Query Result". Simbad. Retrieved October 16, 2007. 

External links[edit]