R Aquilae

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Star
R Aquilae
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Eagle
Right ascension 19 h 06 m 22.25 s
declination + 08 ° 13 ′ 48 ″
Apparent brightness 7.61 likes
Typing
B − V color index +1.60 
U − B color index +0.37 
Spectral class M5e-M9e
Variable star type Mira star 
Astrometry
Radial velocity (34.6 ± 0.6) km / s
parallax ~ (4.7 ± 1.2)  mas
distance approx. 700  ly
approx. 210  pc
Visual absolute brightness M vis +0.97 mag
Proper movement 
Rec. Share: (3.79 ± 0.87)  mas / a
Dec. portion: (−67.01 ± 0.64)  mas / a
Physical Properties
Other names
and catalog entries
Bonn survey BD + 8 ° 3970
Bright Star Catalog HR 7243 [1]
Henry Draper Catalog HD 177940 [2]
Hipparcos catalog HIP 93820 [3]
SAO catalog SAO 124266 [4]
Tycho catalog TYC 1040-241-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
annotation
  1. ↑ Calculated from apparent brightness and distance.
  2. ↑ Only rough values

R Aquilae is a red giant in the constellation Eagle, about 700 light-years from Earth . It is a variable star of the Mira type , the apparent magnitude of which fluctuates between 5.5 mag and 12.0 mag with a period of currently around 284 days. Its spectral class varies between M5 and M9. He is a triple star . The closer companion is 11.1 mag bright and is located at a distance of 76.6 "to the main star, the more distant companion is a 10.4 mag bright star of the spectral class G0 and 180.7" from the main star.

literature

  • Rolf Müller : Investigations on the variable R Aquilae. Dissertation, Berlin 1924

Web links

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ^ Hipparcos, the New Reduction (van Leeuwen, 2007)