Zeta Ophiuchi

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Star
ζ Ophiuchi
Image taken by the Spitzer Space Telescope.  The pronounced bow shock wave can be clearly seen.
Image taken by the Spitzer Space Telescope . The pronounced bow shock wave can be clearly seen.
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation Snake bearer
Right ascension 16 h 37 m 9.54 s
declination -10 ° 34 ′ 1.5 ″
Apparent brightness 2.54 mag
Typing
B − V color index +0.02 
U − B color index −0.86 
R − I index −0.04 
Spectral class O9.5 V
Variable star type Yes 
Astrometry
parallax (8.91 ± 0.20)  mas
distance (366.1 ± 8.2)  ly
(112.2 ± 2.5)  pc
Visual absolute brightness M vis −2.71 mag
Proper movement 
Rec. Share: (15.26 ± 0.26)  mas / a
Dec. portion: (24.79 ± 0.22)  mas / a
Physical Properties
Dimensions (20)  M
radius (8)  R
Luminosity

(68000)  L

Effective temperature (32500)  K
Rotation time 2 days
Age 8 million  a
Other names
and catalog entries
Bayer name ζ Ophiuchi
Flamsteed name 13 Ophiuchi
Bonn survey BD -10 ° 4350
Bright Star Catalog HR 6175 [1]
Henry Draper Catalog HD 149757 [2]
Hipparcos catalog HIP 81377 [3]
SAO catalog SAO 160006 [4]
Tycho catalog TYC 5632-1042-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J16370954-1034014 [6]
Other names Han, FK5 622, PPM 231915
annotation
  1. ↑ Calculated from apparent brightness and distance.

Zeta Ophiuchi ( ζ Ophiuchi , also abbreviated to Zeta Oph , ζ Oph ) is a star in the constellation Snake Bearer , which with an apparent magnitude of 2.54 mag is one of the 100 brightest stars in the night sky. It is located just south of the celestial equator , so it is only visible from Europe in the summer half-year. Zeta Ophiuchi is a hot main sequence star of spectral class O9 V, about 370 light years from Earth , which appears reddish because of the light-absorbing interstellar dust that lies between it and the Earth. In fact, Zeta Ophiuchi would appear significantly brighter and would be one of the brightest stars if its light were not weakened by this layer of dust. The star is about halfway through its stellar evolution and will balloon to a supergiant in the next million years before ending its life in a supernova (Type II).

In the past, the star probably belonged to a binary star system with an even more massive partner. When this exploded in a Super Nova, Zeta Oph was thrown out of the system and a so-called high-speed (runaway star) . Due to its high speed relative to the interstellar medium , a pronounced bow shock wave forms in front of it .

Web links

Individual evidence

  1. a b c Hipparcos catalog (ESA 1997)
  2. a b c Bright Star Catalog
  3. ^ A b Hipparcos, the New Reduction (van Leeuwen, 2007)
  4. a b c d e f Zeta Oph. In: STARS. Jim Kaler, accessed October 29, 2018 .