Castor (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 , Castor is visible in the dawn sky, rising at 02:18 (EDT) – 3 hours and 31 minutes before the Sun – and reaching an altitude of 23° above the north-eastern horizon before fading from view as dawn breaks at around 04:59.
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|
Name
Castor
|
Object type
Star
|
Other names
Position
| Right ascension: | 07h34m35s [5] |
| Declination: | +31°53'18" [5] |
| Constellation: | Gemini |
| Magnitude: Variable | 1.58 (V) [2] 2.92 (G) [5] 3.21 (BP) [5] 2.80 (RP) [5] |
| Distance: | 15.6 parsec 50.8 lightyrs [4] |
| B-V Color (mag): | 0.03 |
| Proper motion (speed): | 240.3 mas/yr[4] |
| Proper motion (pos ang): | 232.8° |
Derived quantities
| Absolute mag (V): | 0.61 |
Visibility from Cambridge
All times shown in Cambridge local time.