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]
Distance 511 ± 8  ly
(157 ± 3  pc)
Absolute magnitude  (MV)−0.86 [1]
Details
Mass 1.1 [4]   M☉
Radius 53 [4]   R☉
Luminosity 554 [4]   L☉
Surface gravity (log g)1.06 [4]   cgs
Temperature 3,836 [4]   K
Rotational velocity (v sin i)5.47 [5]  km/s
Age 10.3 [4]   Gyr
Other designations
e Oph, 66 Her, BD+11°3156, HD 156681, HR 6433, SAO 102725 [6]
Database references
SIMBAD data

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

  1. 1 2 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. 1 2 3 4 5 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. 1 2 3 4 "VizieR Detailed Page". Archived from the original on 2016-03-05. Retrieved 2012-07-13.
  4. 1 2 3 4 5 6 7 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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