Alcor (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 , Alcor is visible in both the dusk and dawn skies. In the evening, it will become visible at around 19:23 (EDT), 31° above your north-western horizon, as dusk fades to darkness. It will then sink towards the horizon, becoming tricky to observe after 21:28 when it dips 17° above your north-western horizon. At 04:47, it will return to an altitude of 17° above your north-eastern horizon, and reach an altitude of 22° before fading from view as dawn breaks at around 05:38.
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|
Name
Alcor
|
Object type
Star
|
Other names
Position
| Right ascension: | 13h25m13s [2] |
| Declination: | +54°59'16" [2] |
| Constellation: | Ursa Major |
| Magnitude: | 3.99 (V) [2] 4.20 (BT) [2] 4.01 (VT) [2] |
| Distance: | 25.1 parsec 81.7 lightyrs [3] |
| B-V Color (mag): | 0.17 |
| Proper motion (speed): | 121.3 mas/yr[3] |
| Proper motion (pos ang): | 97.6° |
Derived quantities
| Absolute mag (V): | 1.99 |
Visibility from Cambridge
All times shown in Cambridge local time.