Arkab Posterior

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Star
Arkab Posterior (β 2 Sagittarii)
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Sagittarius
Right ascension 19 h 23 m 13.14 s
declination -44 ° 47 ′ 59.2 ″
Apparent brightness 4.27 likes
Typing
B − V color index +0.34 
U − B color index +0.07 
Spectral class F2 III
Astrometry
Radial velocity (19.0 ± 4.1) km / s
parallax (24.31 ± 0.19)  mas
distance (134.2 ± 1.0)  ly
(41.14 ± 0.32)  pc  
Visual absolute brightness M vis +1.20 likes
Proper movement 
Rec. Share: (93.45 ± 0.25)  mas / a
Dec. portion: (−54.09 ± 0.16)  mas / a
Physical Properties
Dimensions 2  M ☉
radius 1.4  R ☉
Effective temperature 6900  K
Other names
and catalog entries
Bayer name β 2 sagittarii
Cordoba Survey CD -45 ° 13171
Bright Star Catalog HR 7343 [1]
Henry Draper Catalog HD 181623 [2]
Hipparcos catalog HIP 95294 [3]
SAO catalog SAO 229654 [4]
Tycho catalog TYC 7943-2106-1 [5]
annotation
  1. ↑ Calculated from apparent brightness and distance.

Arkab Posterior ( Arabic عرقوب, DMG 'Arqūb  ' Achilles tendon 'and Latin posterior "the following") is the name of the star β 2  Sagittarii (Beta 2 Sagittarii ). Arkab Posterior has an apparent magnitude of +4.27 mag and belongs to the spectral type F2 III. Arkab Posterior is approximately 139 light years away.

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. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)