e Ophiuchi
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Star in the Ophiuchus constellation
| 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
[edit ]- ^ 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.
- ^ 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.
- ^ a b c d "VizieR Detailed Page". Archived from the original on 2016年03月05日. Retrieved 2012年07月13日.
- ^ 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.
- ^ 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.
- ^ "e Ophiuchi". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2025年10月05日.
- ^ 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.
