36 Ophiuchi

36 Ophiuchi A/B/C

Observation data Epoch J2000      Equinox J2000
Constellation	Ophiuchus
Right ascension	AB: 17h 15m 21s C: 17h 16m 13.4s
Declination	AB: -26° 36' 10" C: -26° 32' 46"
Apparent magnitude (V)	4.32/?/6.32
Characteristics
Spectral type	K0 Ve/K1 Ve/K5 V
U−B color index	0.51/?/1.04
B−V color index	0.85/?/1.15
Variable type	?
Astrometry
Radial velocity (Rv)	+0.0/+0.5/-0.6 km/s
Proper motion (μ)	RA: -473.69 mas/yr Dec.: -1143.93 mas/yr
Parallax (π)	167.51 ± 0.75 mas
Distance	19.47 ± 0.09 ly (5.97 ± 0.03 pc)
Absolute magnitude (MV)	5.44//7.44
Orbit
Companion	36 Ophiuchi B
Period (P)	568.9 yr
Semi-major axis (a)	14.7″
Eccentricity (e)	0.922
Inclination (i)	99.6°
Longitude of the node (Ω)	-83.6°
Periastron epoch (T)	1763.39
Details
Mass	0.85/0.85/0.71 M☉
Radius	0.81/0.81/0.72 R☉
Luminosity	0.28/0.27/0.09 L☉
Temperature	? K
Metallicity	50-98/120-250/46-100
Rotation	?
Age	? years
Other designations
36 Oph, GJ 663 AB, 664, HR 6402/6401/-, CD CD-26°12026, HD 156026, GCTP 3908.00 AB/3913.00, LHS 437/438/439, SAO 185198/185199/185213, HIP 84405/84478.

36 Ophiuchi is a triple star system 19.5 light years away from Earth. It is in constellation Ophiuchus.

The primary and secondary stars are nearly identical orange main sequence dwarves of spectral type K0/K1 and the tertiary star is an orange main sequence dwarf of spectral type K5.

36 Ophiuchi in fiction

In Frank Herbert's Dune universe, the planet Giedi Prime orbits 36 Ophiuchi B.

References

• A.W. Irwin et al, "36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities", Publications of the Astronomical Society of the Pacific, July, 1996.

External links

• "36 Ophiuchi". SolStation. Retrieved November 3. {{cite web}}: Check date values in: |accessdate= (help); Unknown parameter |accessyear= ignored (|access-date= suggested) (help)