Sigma Aquarii

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Double star
σ Aquarii
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation Aquarius
Right ascension 22 h 30 m 38.82 s
declination -10 ° 40 ′ 40.6 ″
Apparent brightness 4.82 likes
Typing
B − V color index −0.06 
U − B color index −0.11 
R − I index −0.04 
Spectral class A0 IVs
Astrometry
Radial velocity (11.7 ± 0.6) km / s
parallax (11.26 ± 1.26)  mas
distance (290 ± 32)  ly
(88.8 ± 9.9)  pc  
Visual absolute brightness M vis +0.08 mag
Proper movement 
Rec. Share: (0.30 ± 1.27)  mas / a
Dec. portion: (−26.87 ± 0.77)  mas / a
Physical Properties
Dimensions 3.1  M
radius 2.1  R
Luminosity

40  L

Effective temperature 7500 to 10000  K
Other names
and catalog entries
Bayer name σ Aquarii
Flamsteed name 57 Aquarii
Bonn survey BD -11 ° 5850
Bright Star Catalog HR 8573 [1]
Henry Draper Catalog HD 213320 [2]
Hipparcos catalog HIP 111123 [3]
SAO catalog SAO 165134 [4]
Tycho catalog TYC 5814-1593-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
Other names FK5 1591
annotation
  1. ↑ Calculated from apparent brightness and distance.

Sigma Aquarii (σ Aquarii / σ Aqr) is an astrometric double star in the constellation Aquarius .

The visible of the two stars, Sigma Aquarii A, is a white sub giant from the type A . The orbital period of Sigma Aquarii B is 654 days.

Web links

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)