Alderamin

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Star
Alderamin (α Cephei)
Alderamin in the constellation Cepheus
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Cepheus
Right ascension 21 h 18 m 34.77 s
declination + 62 ° 35 ′ 8.1 ″
Apparent brightness 2.45 likes
Typing
B − V color index +0.22 
U − B color index +0.11 
R − I index +0.11 
Spectral class A7 IV-V
Astrometry
Radial velocity (−15.8 ± 1.1) km / s
parallax (66.50 ± 0.11)  mas
distance (49.046 ± 0.081)  Lj
(15.038 ± 0.025)  pc  
Visual absolute brightness M vis +1.56 mag
Proper movement 
Rec. Share: (150.55 ± 0.09)  mas / a
Dec. portion: (49.09 ± 0.09)  mas / a
Physical Properties
Dimensions 1.9  M ☉
radius 2.5  R ☉
Luminosity

18  L ☉

Effective temperature 7600  K
Other names
and catalog entries
Bayer name α Cephei
Flamsteed name 5 Cephei
Bonn survey BD + 61 ° 2111
Bright Star Catalog HR 8162 [1]
Henry Draper Catalog HD 203280 [2]
Gliese catalog FY 826 [3]
Hipparcos catalog HIP 105199 [4]
SAO catalog SAO 19302 [5]
Tycho catalog TYC 4252-1870-1 [6]
2MASS catalog 2MASS J21183475 + 6235081 [7]
Other names Alderamin, FK5 803
annotation
  1. ↑ Calculated from apparent brightness and distance.

Alderamine (الذراع اليمين / aḏ-ḏirāʿ al-yamīn  / 'the right arm') is the proper name of the star α Cephei (Alpha Cephei ).

Alderamin has an apparent brightness of 2.45 mag and belongs to the spectral class A7. Its surface is approx. 7600 Kelvin hot. It has about 18 times the luminosity of our sun , 1.9 times the mass and about 2.5 times the diameter. The distance from alderamine is 49 light years.

See also

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)
  5. ↑ a b c d alderamine. Jim Kaler, accessed October 29, 2018 .