Zeta Ophiuchi
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ophiuchus |
Right ascension | 16h 37m 09.53905s[1] |
Declination | −10° 34′ 01.5295″[1] |
Apparent magnitude (V) | 2.56 - 2.58[2] |
Characteristics | |
Spectral type | O9.5 V[3] |
U−B color index | −0.857[4] |
B−V color index | +0.032[4] |
Variable type | γ Cas[2] + β Cep[3] |
Absolute magnitude (MV) | −4.2[6] |
Details | |
Myr | |
J16370954-1034014, Gaia DR2 4337352305315545088 | |
Database references | |
SIMBAD | data |
Zeta Ophiuchi (ζ Oph, ζ Ophiuchi) is a single
In April 2010, ζ Ophiuchi was occulted by asteroid 824 Anastasia.[10][11][12]
Properties
ζ Ophiuchi is an enormous star with more than 19
This is a young star with an age of only three million years.[8] Its luminosity is varying in a periodic manner similar to that of a Beta Cephei variable. This periodicity has a dozen or more frequencies ranging between 1–10 cycles per day.[3] In 1979, examination of the spectrum of this star found "moving bumps" in its helium line profiles. This feature has since been found in other stars, which have come to be called ζ Oph stars. These spectral properties are likely the result of non-radial pulsations.[16]
This star is roughly halfway through the initial phase of its stellar evolution and will, within the next few million years, expand into a red supergiant star wider than the orbit of Jupiter before ending its life in a supernova explosion, leaving behind a neutron star or pulsar. From the Earth, a significant fraction of the light from this star is absorbed by interstellar dust, particularly at the blue end of the spectrum. In fact, were it not for this dust, ζ Ophiuchi would shine several times brighter and be among the very brightest stars visible.[17] If the star's luminosity were not obscured, it would shine at magnitude 1.05, becoming the seventeenth brightest star in the night sky.[note 1]
X-ray emissions have been detected from Zeta Ophiuchi that vary periodically. The net X-ray flux is estimated at 1.2 × 1024 W. In the energy range of 0.5–10 keV, this flux varies by about 20% over a period of 0.77 days. This behavior may be the result of a magnetic field in the star. The measured average strength of the longitudinal field is about 14.1 ± 4.5 mT.[3]
Bow shock
ζ Ophiuchi is moving through space with a
Due to the high
Traditional names
ζ Ophiuchi was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines",[21] along with α Serpentis (Unukalhai), δ Ser (Qin, Tsin), ε Ser (Ba, Pa), δ Ophiuchi (Yed Prior), ε Oph (Yed Posterior) and γ Oph (Tsung Ching).[22]
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Yamānī or Nasak Yamani was the title for two stars: δ Serpentis as Nasak Yamani I and ε Ser as Nasak Yamani II (exclude this star, α Ser, δ Ophiuchi, ε Oph and γ Oph)[23]
In
References
- ^ S2CID 18759600.
- ^ S2CID 125853869.
- ^ S2CID 119270857.
- ^ Bibcode:1984SAAOC...8...59C.
- Bibcode:1999VeARI..35....1W.
- ^ .
- ^ .
- ^ S2CID 118629873.
- S2CID 237503492.
- ^ "Asteroid To Hide Naked-Eye Star". Sky & Telescope. 31 March 2010. Archived from the original on 20 July 2012. Retrieved 20 November 2022.
- ^ "Asteroid To Hide Bright Star". Archived from the original on 5 May 2010. Retrieved 17 July 2019.
- ^ "(824) Anastasia / HIP 81377 event on 2010 Apr 06, 10:21 UT". Archived from the original on 17 July 2019. Retrieved 17 July 2019.
- ^ S2CID 14474019.
- ^ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. 21 December 2004. Archived from the original on 2019-09-04. Retrieved 21 November 2022.
- .
- .
- ^ Kaler, James B. "ZETA OPH (Zeta Ophiuchi)". Stars. University of Illinois.
- Bibcode:1989A&A...216...44D.
- S2CID 236318269.
- ^ "Runaway Star Plows Through Space". Jet Propulsion Laboratory. Archived from the original on 11 May 2011. Retrieved 20 November 2022.
- ISBN 1-931559-44-9.)
{{cite book}}
: CS1 maint: multiple names: authors list (link - ISBN 0-486-21079-0. Retrieved 12 December 2010.
- ^ Jack W. Rhoads (15 November 1971). "Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars" (PDF). Jet Propulsion Laboratory, California Institute of Technology.
- ISBN 978-986-7332-25-7.
- ^ R.H.Allen. "Star Names". p. 302.
- ^ "香港太空館 - 研究資源 - 亮星中英對照表" (in Chinese). Hong Kong Space Museum. Archived from the original on 29 January 2011. Retrieved 23 November 2010.
- ^ "English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name" (in Chinese). Hong Kong Space Museum. Archived from the original on 10 August 2010. Retrieved 23 November 2010.
- ^ Ian Ridpath. "Star Tales - Capricornus the Sea Goat". Archived from the original on 8 September 2022. Retrieved 21 November 2022.