Algenib

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Stern
Algenib (γ Pegasi)
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Pegasus
Right ascension 00 h 13 m 14.15 s
declination + 15 ° 11 ′ 1 ″
Apparent brightness 2.83 mag
Typing
B − V color index −0.23 
U − B color index −0.87 
R − I index −0.19 
Spectral class B2 IV
Variable star type BCEP 
Astrometry
Radial velocity (3.2 ± 0.3) km / s
parallax (8.33 ± 0.53)  mas
distance (392 ± 25)  ly
(120.0 ± 7.6)  pc  
Visual absolute brightness M vis −2.57 mag
Proper movement 
Rec. Share: (+1.98 ± 0.55)  mas / a
Dec. portion: (−9.28 ± 0.34)  mas / a
Physical Properties
Effective temperature 20,000  K
Other names
and catalog entries
Bayer name γ pegasi
Flamsteed name 88 pegasi
Bonn survey BD + 14 ° 14
Bright Star Catalog HR 39 [1]
Henry Draper Catalog HD 886 [2]
Hipparcos catalog HIP 1067 [3]
SAO catalog SAO 91781 [4]
Tycho catalog TYC 1179-01775-1 [5]
2MASS catalog 2MASS J00131414 + 1511008 [6]
Other names FK5 7 • GSC 01179-01775 • IRAS 00106 + 1454
annotation
  1. ↑ Calculated from apparent brightness and distance.

Algenib (from Arabic الجانب, DMG al-ğānib  'the flank', 'the side') is the name of the star γ Pegasi (Gamma Pegasi ). Algenib marks the southeast corner of Pegasus Square . Together with its northern neighbor star Sirrah it marks approximately the "prime meridian" of the starry sky, the meridian with the coordinate value right ascension = zero.

Algenib is a variable star of the β Cephei type . Its brightness fluctuates between 2.78 and 2.89 mag with a period of 0.1575 days.

Algenib is 392 light years away and belongs to spectral class B2.

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)