SAO 49986

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SAO 49986 / SAO 49982[1][2]
Observation data
Epoch J2000.0
Constellation
(pronunciation)		 Cygnus
Right ascension 20h 43m 17.2228s / 20h 43m 13.8546s
Declination +44° 46' 03.442" / +44° 56' 21.532"
Apparent magnitude (V) 8.62 / 9.51
Characteristics
Spectral type B9.5V / B8
U-B color index -0.35 / -0.01
B-V color index -0.08 / +0.04
Astrometry
Radial velocity (Rv) -37 km/s
Proper motion (μ) RA: 3.00 / 3.50 mas/yr
Dec.: -3.70 / 1.90 mas/yr
Other designations
SAO 49986, HD 197621, BD+44°3553, GSC 03178-01126, SAO 49982, BD+44°3552, GSC 03178-00859

SAO 49986 and SAO 49982 form a binary star system in the constellation Cygnus. 9th magnitude SAO 49986 is the brighter of the two, a bluish white dwarf star with a spectral type of B9.5V. 10th magnitude SAO 49982 is also a bluish white star, with a spectral type of B8. SAO 49986 possesses a surface temperature of about 11,000 kelvins, and is about the same size as our Sun, yet almost twice as hot, and much brighter.[1][2] Both stars can be found within 30 arcminutes of the star Deneb.[3]

[edit] References

  1. ^ a b Simbad Query Result. Simbad. Retrieved on October 13, 2007.
  2. ^ a b Simbad Query Result. Simbad. Retrieved on October 13, 2007.
  3. ^ Autostar Suite Astronomer Edition. CD-ROM. Meade, April 2006.