36 Ophiuchi
| 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 | 19.46 ly (5.970 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.
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. November 3.
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