The Full Wiki

Zeta Ophiuchi: Wikis

Advertisements
  

Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.

Encyclopedia

From Wikipedia, the free encyclopedia

Zeta Ophiuchi
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 37m 09.5s
Declination -10° 34′ 01.4″
Apparent magnitude (V) 2.54
Characteristics
Spectral type O9 III
U-B color index -0.86
B-V color index 0.02
Variable type Gamma Cass.
Astrometry
Radial velocity (Rv) -15 km/s
Proper motion (μ) RA: 13.07 mas/yr
Dec.: 25.44 mas/yr
Parallax (π) 7.12 ± 0.71 mas
Distance 458 ly
(140 pc)
Absolute magnitude (MV) -3.20
Details
Mass 20 M
Radius 8 R
Luminosity 68,000 L
Temperature 33,500 K
Metallicity titanium
Rotation 380 km/s.
Age 4 × 106 years
Other designations
13 Oph, HR 6175, BD -10°4350, HD 149757, SAO 160006, FK5 622, HIP 81377.

Zeta Ophiuchi (ζ Oph / ζ Ophiuchi) is a star located in the constellation of Ophiuchus. Unlike most of the brighter stars in the sky, ζ Ophiuchi does not have a proper name, although it may have been referred to as Hán (韓) by the Chinese. Although ζ Ophiuchi is a hot blue giant star it appears reddish due to interstellar dust that absorbs much of blue light. In fact, were it not for this dust, ζ Ophiuchi would shine several times brighter and be among the very brightest visible. ζ Ophiuchi is roughly half way through the initial phase of its stellar evolution and will within the next few million years expand into a supergiant star before ending its life in a spectacular supernova.

References

Advertisements

Advertisements






Got something to say? Make a comment.
Your name
Your email address
Message