Alsafi

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Star
Alsafi
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Dragon
Right ascension 19 h 32 m 21.59 s
declination + 69 ° 39 ′ 40.2 ″
Apparent brightness 4.67 likes
Typing
B − V color index +0.79 
U − B color index +0.38 
R − I index +0.41 
Spectral class G9 V
Astrometry
Radial velocity (+26.8 ± 0.1) km / s
parallax (173.77 ± 0.18)  mas
distance (18.77 ± 0.02)  Lj
(5.755 ± 0.006)  pc  
Visual absolute brightness M vis +5.87 mag
Proper movement 
Rec. Share: (+598.07 ± 0.17)  mas / a
Dec. portion: (−1738.40 ± 0.19)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name σ Draconis
Flamsteed name 61 Draconis
Bonn survey BD + 69 ° 1053
Bright Star Catalog HR 7462 [1]
Henry Draper Catalog HD 185144 [2]
Gliese catalog FY 764 [3]
Hipparcos catalog HIP 96100 [4]
SAO catalog SAO 18396 [5]
Tycho catalog TYC 4448-2481-1 [6]
2MASS catalog 2MASS J19322153 + 6939413 [7]
Other names Alsafi

Alsafi , Bayer designation Sigma Draconis ( σ Dra ), is an approx. 19 light-years distant star of the spectral class G9 V in the constellation Dragon with an apparent visual magnitude of 4.7 mag. Its historical proper name comes from Arabic الأثافي, DMG al-aṯāfī and means "tripod (for cooking)".

Individual evidence

  1. ↑ a b 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)
  5. ↑ estimated based on the apparent brightness and distance
  6. ↑ Naming Stars. IAU , accessed on August 23, 2020 .
  7. ^ Henry, Todd J .: The 100 Nearest Star Systems. Retrieved January 20, 2018 .