Castor Position and Visibility Tonight
Where is Castor right now?
Castor is located in the constellation Gemini. It is currently above the horizon at an altitude of 36° toward the north-east, with an apparent magnitude of 1.58.
Castor visibility on 2026-08-26
Castor Visible from early morning until sunrise
Castor rise and set timetable
| Time | Elevation | |
| Castor transit | 08:26 | 85° |
| Castor set | 16:18 | |
Moonrise, 95.2% illuminated  | 16:40 | -3° |
| Astronomical observing session begins | 19:19 | -19° |
| Castor rise | 00:30 | |
| Moonset | 02:57 | 25° |
| Astronomical observing session ends | 03:00 | 25° |
| Twilight end | 03:34 | 32° |
| Civil sunrise | 04:06 | 38° |
| Sunrise | 04:34 | 43° |
Track Castor Position Throughout the Night
← 26 August 2026 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe Castor changing position in the night sky.
Castor - Multiple Star System
Castor is the second-brightest star in the constellation Gemini and the twenty-fourth-brightest star in the night sky. It is a multiple star system located about 51 light-years away from Earth.
Castor has an apparent magnitude of 1.58 and consists of six main stars. It is one of the most prominent stars in the winter sky in the Northern Hemisphere.
Finder Chart for Castor
Double-click to unlock the map.
| Object name | Castor |
| Field of view | |
| Limiting magnitude | |
| Castor coordinates | 7.576633999999999, 31.888276 |
| Center coordinates | 7.576633999999999, 31.888276 |
Castor Passage Through Night
Double-click to unlock the map.
Current position of Castor
| Time | 04:01 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| Elevation | 36° |
| Azimuth | 75° |
Here you can see the current position of Castor on the map, as well as its positions for rise and set. This tool lets you track its movement throughout the night with accurate, up-to-date information.
Annual motion of Castor
Castor will remain visible until May 27, when it moves too close to the Sun and temporarily disappears from the night sky.
| Date | Wed, 26 August 2026 |
| Twilight start | 19:14 |
| Twilight end | 02:54 |
| Twilight duration | 8h 39m |
| Rise | 00:30 |
| Set | 16:14 |
| Elevation at transit | 85° |
| Transit time | 08:22 |
| Equatorial coordinates | RA: 07h 34m 35s", Dec: 31° 53' 17s |
| Magnitude | 2 |
| Constellation | Gemini |
The graph illustrates the annual visibility pattern of Castor, including its daily appearances and transit times. The vertical axis shows the hours of the day and the horizontal axis spans the year. The reddish area marks when the object is above the horizon, while the white line marks its daily transit.
You can also view detailed visibility information in a table with exact rise, transit, and set times for each date.
You can also view detailed visibility information in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of Castor
Coordinates and Visibility
| Right Ascension | 7.576633999999999° |
| Declination | 31.888276° |
| Magnitude | 1.58 |
| Constellation | Gemini |
| Elevation | 36.1° |
| Azimuth | 74.6° |