Pi Capricorni

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Double star
π Capricorni
π cap in the constellation "Capricorn"
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Capricorn
Right ascension 20 h 27 m 19.21 s
declination -18 ° 12 ′ 42.2 ″
Apparent brightness 5.07 likes
Typing
B − V color index −0.05 
Spectral class B3 / 5 V
Astrometry
Radial velocity (−13.0 ± 4.2) km / s
parallax (5.98 ± 0.58)  mas
distance (545 ± 53)  ly
(167 ± 16)  pc
Proper movement 
Rec. Share: (11.89 ± 0.65)  mas / a
Dec. portion: (−11.35 ± 0.43)  mas / a
Physical Properties
Dimensions 5.9  M ☉
Luminosity

240  L ☉

Effective temperature 9600  K
Other names
and catalog entries
Bayer name π Capricorni
Flamsteed name 10 capricorni
Bonn survey BD −18 ° 5685
Bright Star Catalog HR 7814 [1]
Henry Draper Catalog HD 194636 [2]
Hipparcos catalog HIP 100881 [3]
SAO catalog SAO 163592 [4]
Tycho catalog TYC 6333-2129-2 [5]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS 20271920-1812419 [6]
Other names WDS 20273-1813
CCDM 20273-1813

Pi Capricorni (π Cap) is a visual and spectroscopic multiple star in the constellation Capricorn . It has a total brightness of 5.1 mag and its distance is approximately 545 light years .

In 1846, Sherburne Wesley Burnham found an almost 20 times weaker companion B with an apparent magnitude of 8.5 mag next to the bright blue-white main sequence star A with an apparent magnitude of 5.1 mag, about 3 arc seconds . Over 50 years later, in 1898, he was able to describe a third component C. This star only has a brightness of 14.1 mag, its distance to the main star A is about 38 arc seconds.

In 1992 the main star A could still be recognized as a narrow spectroscopic double star. Its two components Aa and Ab have apparent magnitudes of 5.3 and 7.9 mag.

The main star of this quadruple system has about 6 times the mass of the sun and a 240 times higher luminosity. Its surface temperature is around 9600 K.

The star is sometimes referred to with the proper name "Okul" or "Oculus" (from Latin oculus , "eye"), because it can be found in the constellation of the Capricorn in the place of its eye.

Individual evidence

  1. ↑ a b c d e VizieR: Hipparcos, the New Reduction (van Leeuwen, 2007) - The Astrometric Catalog
  2. ↑ VizieR: Michigan Catalog of HD stars, Vol.4 (Houk +, 1988)
  3. ↑ VizieR: Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)
  4. ↑ VizieR: Young runaway stars within 3kpc (Tetzlaff +, 2011)
  5. ↑ a b VizieR: Infrared excesses of Hipparcos stars (McDonald +, 2012)
  6. ↑ VizieR: The Washington Visual Double Star Catalog (Mason + 2001-2014)