V640-Her (Star)
Color-magnitude diagram
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 30 arcminutes across.
Finder chart
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From Cambridge , V640-Her is visible in the dawn sky, rising at 22:18 (EDT) and reaching an altitude of 64° above the southern horizon before fading from view as dawn breaks at around 05:14.
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|
Name
V640-Her
|
Object type
Star
|
Other names
Position
| Right ascension: | 17h25m54s [4] |
| Declination: | +16°55'03" [4] |
| Constellation: | Hercules |
| Magnitude: Variable | 6.18 (V) [2] 8.14 (BT) [2] 6.34 (VT) [2] 4.76 (G) [4] 6.40 (BP) [4] 3.52 (RP) [4] |
| Distance: | 222.9 parsec 726.7 lightyrs [4] |
| B-V Color (mag): | 1.53 |
| Proper motion (speed): | 21.5 mas/yr[4] |
| Proper motion (pos ang): | 318.4° |
Derived quantities
| Absolute mag (V): | -0.56 |
Visibility from Cambridge
All times shown in Cambridge local time.