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E Ophiuchi

Star in the Ophiuchus constellation

e Ophiuchi
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Ophiuchus^[1]
Right ascension	17^h 18^m 36.99^s^[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 (R_v)	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 (M_V)	−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 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.
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.
1 2 3 4 "VizieR Detailed Page". Archived from the original on 2016-03-05. Retrieved 2012-07-13.
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.
↑ 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 2025-10-05.
↑ 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.

v
t
e

Constellation of Ophiuchus

List of stars in Ophiuchus
Ophiuchus in Chinese astronomy
Taurus Poniatovii

Stars

Bayer	α (Rasalhague) β (Cebalrai) γ (Bake-eo) δ (Yed Prior) ε (Yed Posterior) ζ η (Sabik) θ ι κ λ (Marfik) μ ν ξ ο ρ σ τ υ φ χ ψ ω e
Flamsteed	12 14 15 16 18 19 20 21 23 24 26 28 29 30 31 36 (Guniibuu) 37 38 41 43 44 (b) 45 (d, θ Tel) 47 50 51 (c) 52 53 (f) 54 58 61 66 67 68 70 (p) 71 72 73 74 24 Sco 30 Sco
Variable	X RS V841 V849 V1054 V2052 V2291 V2293 V2306 V2307 V2500 (Barnard's Star)
HR	6441 6516 6601
HD	148427 (Timir) 149143 (Rosalíadecastro) 149382 154088 160346 164509 170469 171028
Other	AS 209 CFHTWIR-Oph 98 CoRoT-6 CoRoT-25 CoRoT-26 CX330 Elias 2-27 Flying Saucer Gaia BH1 Gliese 673 GJ 1214 (Orkaria) GJ 3998 Great Annihilator GRO J1719−24 IRAS 16293−2422 K2-32 M10-VLA1 MAXI J1659-152 MAXI J1820+070 Oph-IRS 48 RIK-210 SDSS 1624+00 SR 12 VB 8 VVV BD001 WISE 1800+0134 XTE J1739−285

Exoplanets	CFHTWIR-Oph 98 b CoRoT-6b CoRoT-25b CoRoT-26b GJ 1214 b (Enaiposha) HD 149143 b (Riosar) HD 155233 b HD 156846 b HD 170469 b HD 171028 b ROXs 42Bb Wolf 1061b c d

Star
clusters

NGC	6284 6287 6293 6304 6316 6325 6342 6355 6356 6366 6401 6426 6633
Other	IC 4665 Melotte 186 Messier 9 Messier 10 Messier 12 Messier 14 Messier 19 Messier 62 Messier 107 Ophion Palomar 6

Nebulae

NGC	6309 6369 6572
Other	Barnard 68 Dark Horse Double Helix Nebula M2-9 Ophiuchus Superbubble Pipe Nebula Rho Ophiuchi cloud complex Serpens–Aquila Rift Sh 2-24 Sh 2-27 Snake Nebula

Galaxies

NGC	6240 6384 6509 6570
Other	3C 353 3C 368 IRAS 17208−0014 NeVe 1 PKS 1741−03

Galaxy clusters	Abell 2163 Ophiuchus Supercluster

Astronomical events	Kepler's Supernova IGR J17329-2731