Alpha Sagittae

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Star
α Sagittae
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation arrow
Right ascension 19 h 40 m 5.8 s
declination + 18 ° 00 ′ 50 ″
Apparent brightness 4.39 likes
Typing
B − V color index +0.78 
U − B color index +0.43 
R − I index +0.37 
Spectral class G0 II
Astrometry
Radial velocity (+1.8 ± 0.2) km / s
parallax (7.67 ± 0.24)  mas
distance (425 ± 13)  ly
(130 ± 4)  pc  
Visual absolute brightness M vis −1.2 mag
Proper movement 
Rec. Share: (+15.09 ± 0.16)  mas / a
Dec. portion: (−19.65 ± 0.15)  mas / a
Physical Properties
radius 20  R
Effective temperature 5400  K
Other names
and catalog entries
Bayer name α sagittae
Flamsteed name 5 sagittae
Bonn survey BD + 17 ° 4042
Bright Star Catalog HR 7479 [1]
Henry Draper Catalog HD 185758 [2]
Hipparcos catalog HIP 96757 [3]
SAO catalog SAO 105120 [4]
Tycho catalog TYC 1606-2341-1 [5]
Other names Sham, Alsahm
annotation
  1. estimated from apparent brightness and distance

α Sagittae ( Alpha Sagittae , α Sge ) is a yellow giant of the spectral class G0 in the constellation Sagitta . It has an apparent magnitude of 4.4 mag and is approximately 425 light years from Earth.

The star bears the historical proper name Sham or Alsahm (from the Arabic for "arrow").

Individual evidence

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