HD 215441

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Stern
HD 215441
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation lizard
Right ascension 22 h 44 m 7.5 s
declination + 55 ° 35 ′ 21.2 ″
Apparent brightness 8.81 (8.73 to 8.9) mag
Typing
B − V color index +0.04 
Spectral class A0p
Variable star type ACV 
Astrometry
parallax 2.03 ± 0.04  mas
distance 1600 ± 40  ly
490  pc
Proper movement 
Rec. Share: +4.50 ± 0.07  mas / a
Dec. portion: −1.06 ± 0.07  mas / a
Physical Properties
Other names
and catalog entries
Bonn survey BD + 54 ° 2846
Henry Draper Catalog HD 215441 [1]
Hipparcos catalog HIP 112247 [2]
SAO catalog SAO 34741 [3]
Tycho catalog TYC 3988-698-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J22440750 + 5535211 [5]
Other names Babcock's Star, GL Lacertae

HD 215441 (also GL Lacertae , GL Lac for short ) is an Ap star (a star that shows unusual elements in its spectrum) and also has a strong magnetic field. As a variable it belongs to the Alpha 2 -Canum Venaticorum stars . Its distance is about 1,600  light years .

For a star, HD 215441 has a strong magnetic field of around 34  kilogauss, which corresponds to 3.4  Tesla . This value was determined in 1960 by Horace Welcome Babcock , which is why the star is also known as Babcock's star .

Individual evidence

  1. ↑ a b c d e f GL Lac. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed August 26, 2018 .
  2. ↑ a b GL Lac. In: VSX. AAVSO, accessed August 26, 2018 .
  3. ↑ Horace W. Babcock: The 34-KILOGAUSS Magnetic Field of HD 215441 . In: The Astrophysical Journal . 132, 1960, pp. 521-531. bibcode : 1960ApJ ... 132..521B . doi : 10.1086 / 146960 .