36 Ophiuchi
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| Observation data 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) | 5.05/5.08/6.34 |
| Characteristics | |
| Spectral type | K0 Ve/K1 Ve/K5 V |
| U-B color index | 0.51(AB)/1.04 |
| B-V color index | 0.86(AB)/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) | 6.17/6.20/7.46 |
| Visual binary orbit | |
| Companion | 36 Ophiuchi B |
| Period (P) | 568.9 a |
| Semimajor axis (a) | 14.7" |
| Eccentricity (e) | 0.922 |
| Inclination (i) | 99.6° |
| 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 | 5125/5100/4550 K |
| Metallicity | A: 50-98%Sun B: 120-250%Sun C: 46-100%Sun |
| 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 the movements of the A-B pair. Both A and B have active chromospheres.
[edit] See also
[edit] 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.
- G. Cayrel de Strobel, Y. Lebreton, M.-N. Perrin, R. Cayrel, "A thorough spectroscopic study of the very nearby triple system - 36 Ophiuchi", Astronomy and Astrophysics, vol. 225, no. 2, Nov. 1989, p. 369-380.
[edit] External links
- 36 Ophiuchi. SolStation. Retrieved on 3 November, 2005.
- HD 156026. ARICNS. Retrieved on 21 July, 2006.
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