E Ophiuchi

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e Ophiuchi
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ophiuchus[1]
Right ascension 17h 18m 36.99s[2]
Declination +10° 51′ 52.1″[2]
Apparent magnitude (V) 5.03[3]
Characteristics
Evolutionary stage red giant branch[4]
Spectral type K4II-III[3]
U−B color index 1.89[3]
B−V color index 1.55[3]
R−I color index 0.83[citation needed]
Astrometry
Radial velocity (Rv)1.89 km/s
Proper motion (μ) RA: +7.676[2] mas/yr
Dec.: −97.830[2] mas/yr
Parallax (π)6.3784±0.1045 mas[2]
Distance511 ± 8 ly
(157 ± 3 pc)
Absolute magnitude (MV)−0.86[1]
Details
Mass1.1[4] M☉
Radius53[4] R☉
Luminosity554[4] L☉
Surface gravity (log g)1.06[4] cgs
Temperature3,836[4] K
Rotational velocity (v sin i)5.47[5] km/s
Age10.3[4] Gyr
Other designations
e Oph, 66 Her, BD+11°3156, HD 156681, HR 6433, SAO 102725[6]
Database references
SIMBADdata

e Ophiuchi (HD 156681) is a star in the constellation Ophiuchus near the border with Hercules, which it had been mistakenly catalogued 66 Herculis.[7] It has an apparent magnitude of 5.03.

References

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  1. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c d "VizieR Detailed Page". Archived from the original on 2016-03-05. Retrieved 2012-07-13.
  4. ^ a b c d e f g Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity". Astronomy and Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360.
  5. ^ Hekker, S.; Meléndez, J. (2007). "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters". Astronomy and Astrophysics. 475 (3): 1003. arXiv:0709.1145. Bibcode:2007A&A...475.1003H. doi:10.1051/0004-6361:20078233.
  6. ^ "e Ophiuchi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-10-05.
  7. ^ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy, 18 (3): 209–223, Bibcode:1987JHA....18..209W, doi:10.1177/002182868701800305, S2CID 118445625.


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