τ-Oph (Star)
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 30 arcminutes across.
From Cambridge , τ-Oph is not observable – it will reach its highest point in the sky during daytime and is no higher than 17° above the horizon at dusk.
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Name
τ-Oph
|
Object type
Star
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Other names
Position
| Right ascension: | 18h03m04s [4] |
| Declination: | −08°10'49" [4] |
| Constellation: | Ophiuchus |
| Magnitude: Variable | 5.23 (V) [2] 5.70 (BT) [2] 5.27 (VT) [2] 5.13 (G) [4] 5.15 (BP) [4] 4.63 (RP) [4] |
| Distance: | 55.0 parsec 179.2 lightyrs [4] |
| B-V Color (mag): | 0.36 |
| Proper motion (speed): | 39.8 mas/yr[4] |
| Proper motion (pos ang): | 161.4° |
Derived quantities
| Absolute mag (V): | 1.53 |
Sources