Double Star 21520+5548 Observation Details
21520+5548 Daily Motion
21520+5548 will rise before twilight begins, at 19:22, and will reach 32° elevation by the time twilight commences at 00:05. It will reach its transit at 34° by 01:21 and gradually fade away as the night ends at 06:15, maintaining an elevation of around 9°.21520+5548 will be visible until December, 6, when it will move too close to the Sun. During this time, its proximity to the Sun will cause it to disappear from the night sky, making it unobservable for a while.
21520+5548 Visibility Timetable on August 13
21520+5548 Rise and Set Timetable
| Time | Elevation | |
| 21520+5548 rise | 19:22 | |
| Civil sunset | 19:29 | 1° |
| Astrosession begin | 20:19 | 8° |
| Moon Rise, 75.6% illuminated | 22:41 | 26° |
| 21520+5548 transit | 01:21 | 34° |
| Astrosession end | 05:50 | 12° |
| Civil sunrise | 06:39 | 6° |
| Sunrise | 07:02 | 3° |
| 21520+5548 set | 07:20 | |
| Moon Set | 11:07 | -28° |
Track 21520+5548 Position Throughout the Night
← Wed, 13 August 2025 →
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21520+5548 Star System Description
21520+5548 is Triple Star System located in constellation Cepheus at coordinates RA: 21h 52m 00s", Dec: 55° 47' 48s.
The primary component has a magnitude of 5.64, while the secondary component has a magnitude of 6.42. They are separated by 21.1 arcseconds at a position angle of 192 degrees. The brightness difference between the two components is 0.78 magnitudes, with the primary component being approximately 2.1 times brighter than the secondary.
Below is a table with star system details from the Washington Double Star (WDS) Catalog. This catalog is a comprehensive source of information on double and multiple star systems, providing key data on the positions, magnitudes, and separations of stellar components.
The primary component has a magnitude of 5.64, while the secondary component has a magnitude of 6.42. They are separated by 21.1 arcseconds at a position angle of 192 degrees. The brightness difference between the two components is 0.78 magnitudes, with the primary component being approximately 2.1 times brighter than the secondary.
Below is a table with star system details from the Washington Double Star (WDS) Catalog. This catalog is a comprehensive source of information on double and multiple star systems, providing key data on the positions, magnitudes, and separations of stellar components.
Technical Details of Star System 21520+5548
| Property | Value |
|---|---|
| Star System Identifier | 21520+5548 |
| System Type | Triple Star System |
| Primary Star | Cep-21520 5548 |
| Right Ascension (RA) | 21.86694 (21h 52m 00s") |
| Declination (Dec) | 55.79675 (55° 47' 48s) |
| Magnitude (Primary) | 5.64 |
| Magnitude (Secondary) | 6.42 |
| Spectral Type (Primary/Secondary) | B6IV-V |
| Separation (Arcseconds) | 21.1 |
| Position Angle | 192° |
| Discovery Year | 1782 |
| Last Observed | 2018 |
| Primary Proper Motion (Ra, Dec) | +019-001 |
| Secondary Proper Motion (Ra, Dec) | +013+013 |
| Number of Observations | 111 |
21520+5548 Components
| Component | Magnitude | Separation (arcseconds) | Position Angle |
| AB | 6.42 | 21.1 | 192 |
| AC | 13.1 | 55.2 | 348 |
The data presented in this table is sourced from the Washington Double Star (WDS) Catalog, a comprehensive repository of double and multiple star system information maintained by the U.S. Naval Observatory. We thank the WDS team for their continued efforts in providing accurate and detailed astronomical data.
Finder Chart for
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| Object name | 21520+5548 |
| Field of view | |
| Limiting magnitude | |
| 21520+5548 coordinates | 21.86694, 55.79675 |
| Center coordinates | 21.86694, 55.79675 |
21520+5548 Passage Through Night
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Current position of 21520+5548
| Time | 00:05 |
| Latitude | 0 |
| Longitude | 0 |
| 21520+5548 elevation | 32° |
| 21520+5548 Azimuth | -12° |
Here you can see the current position of the 21520+5548 on the map, as well as its positions for rise and set. This tool allows you to track the 21520+5548's movement throughout the night, providing you with accurate and up-to-date information.
Annual motion of 21520+5548
| Date | Thu, 14 August 2025 |
| Twighlight start | 20:15 |
| Twighlight end | 05:45 |
| Twighlight duration | 9h 30m |
| Rise | 19:18 |
| Set | 07:16 |
| Elevation at transit | 34° |
| Transit time | 01:17 |
| Equatorial coordinates | RA: 21h 52m 00s", Dec: 55° 47' 48s |
| Magnitude | 6 |
| Constellation | Cepheus |
The graph illustrates the annual visibility pattern of a 21520+5548, providing a comprehensive overview of its daily appearances and transit times throughout the year.
The graph is structured with the vertical axis showing the hours of the day, ranging from 12 AM to 12 AM the next day, while the horizontal axis spans each day of the year.
The reddish shaded area indicates the periods when the 21520+5548 is above the horizon, visible to observers. The white line marks the times when the celestial object reaches its highest point in the sky each day, known as the transit.
The graph is structured with the vertical axis showing the hours of the day, ranging from 12 AM to 12 AM the next day, while the horizontal axis spans each day of the year.
The reddish shaded area indicates the periods when the 21520+5548 is above the horizon, visible to observers. The white line marks the times when the celestial object reaches its highest point in the sky each day, known as the transit.