36 Ophiuchi: Difference between revisions
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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. |
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. |
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Star C is separated from the A-B pair by 700 [[arc second]]s, compared to 4.6 arcsec for A-B, so it has a negligible effect on on the movements of the A-B pair. Both A and B have active [[chromosphere]]s. |
Star C is separated from the A-B pair by 700 [[arc second]]s, compared to a minimum of 4.6 arcsec for A-B, so it has a negligible effect on on the movements of the A-B pair. Both A and B have active [[chromosphere]]s. |
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==36 Ophiuchi in fiction== |
==36 Ophiuchi in fiction== |
Revision as of 19:26, 21 July 2006
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 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.
Star C is separated from the A-B pair by 700 arc seconds, compared to a minimum of 4.6 arcsec for A-B, so it has a negligible effect on on the movements of the A-B pair. Both A and B have active chromospheres.
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.
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