Altais

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Star
Altais (δ Dra)
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Dragon
Right ascension 19 h 12 m 33.3 s
declination + 67 ° 39 ′ 41.6 ″
Apparent brightness 3.07 mag
Typing
B − V color index +1.00 
U − B color index +0.78 
R − I index +0.51 
Spectral class G9 III
Astrometry
Radial velocity (24.7 ± 0.2) km / s
parallax (33.48 ± 0.10)  mas
distance (97.42 ± 0.29)  Lj
(29.869 ± 0.089)  pc  
Visual absolute brightness M vis +0.69 mag
Proper movement 
Rec. Share: (95.74 ± 0.10)  mas / a
Dec. portion: (91.92 ± 0.11)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name δ Draconis
Flamsteed name 57 Draconis
Bonn survey BD + 67 # 1129
Bright Star Catalog HR 7310 [1]
Henry Draper Catalog HD 180711 [2]
Hipparcos catalog HIP 94376 [3]
SAO catalog SAO 18222 [4]
Tycho catalog TYC 4444-2239-1 [5]
annotation
  1. ↑ Calculated from apparent brightness and distance.

Altais (from Arabic التيس, DMG at-tais  'the billy goat') is the proper name of the star δ Draconis (Delta Draconis). Altais has an apparent magnitude of +3.07 mag and belongs to the spectral type G9III. Altais is approximately 100 light years from Earth. Other names: Nodus II (Nodus Secundus), Aldib

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)