21520 5548 Position and Visibility Tonight
Where is 21520+5548 right now?
21520+5548 is located in the constellation Cepheus. It is currently above the horizon at an altitude of 68° toward the north-east, with an apparent magnitude of 5.64.
Twilight begins at 20:43 local time. At that moment, 21520+5548 will be 68° above the horizon toward the north-east.
Twilight begins at 20:43 local time. At that moment, 21520+5548 will be 68° above the horizon toward the north-east.
21520+5548 visibility on 2026-09-08
21520 5548 Visible all night
21520+5548 rise and set timetable
| Time | Elevation | |
| 21520+5548 is always above the horizon | ||
Moonrise, 21% illuminated  | 00:35 | 57° |
| Moonset | 15:38 | 29° |
| Sunset | 17:26 | 43° |
| Civil sunset | 17:53 | 47° |
| Twilight start | 18:24 | 51° |
| Astronomical observing session begins | 18:56 | 56° |
| 21520+5548 is always above the horizon | ||
| 21520+5548 transit | 21:50 | 72° |
| Astronomical observing session ends | 03:14 | 35° |
| Twilight end | 03:46 | 30° |
| Civil sunrise | 04:17 | 27° |
| Sunrise | 04:45 | 23° |
Track 21520+5548 Position Throughout the Night
← 8 September 2026 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe 21520+5548 changing position in the night sky.
Star system description: 21520+5548
System 21520+5548 — triple star system, is located in the constellation Cepheus, at coordinates RA: 21h 52m 00s", Dec: 55° 47' 48s.
The primary and secondary magnitudes are 5.64 and 6.42. Their separation is 21.1 arcseconds, at position angle 192°. The magnitude difference is 0.78 magnitudes; the primary is approximately 2.1 times brighter.
The following technical data come from the Washington Double Star Catalog.
The primary and secondary magnitudes are 5.64 and 6.42. Their separation is 21.1 arcseconds, at position angle 192°. The magnitude difference is 0.78 magnitudes; the primary is approximately 2.1 times brighter.
The following technical data come from the Washington Double Star Catalog.
Technical details: 21520+5548
| Property | Value |
|---|---|
| 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) |
| Primary magnitude | 5.64 |
| Secondary magnitude | 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 |
Components of 21520+5548
| Component | Magnitude | Separation (arcseconds) | Position angle |
| AB | 6.42 | 21.1 | 192 |
| AC | 13.1 | 55.2 | 348 |
Data source: Washington Double Star (WDS) Catalog. Maintained by the U.S. Naval Observatory; thanks to the WDS team.
Finder Chart for
Double-click to unlock the map.
| Object name | |
| Field of view | |
| Limiting magnitude | |
| coordinates | 21.86694, 55.79675 |
| Center coordinates | 21.86694, 55.79675 |
21520 5548 Passage Through Night
Double-click to unlock the map.
Current position of 21520 5548
| Time | 20:43 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| Elevation | 68° |
| Azimuth | 26° |
Here you can see the current position of 21520 5548 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.
When Is 21520 5548 Visible Throughout the Year?
21520+5548 will remain visible until February 11, when it moves too close to the Sun and temporarily disappears from the night sky.
| Date | Wed, 9 September 2026 |
| Twilight start | 18:54 |
| Twilight end | 03:13 |
| Twilight duration | 8h 18m |
| Rise | 21520 5548 is always up |
| Set | 21520 5548 is always up |
| Elevation at transit | 72° |
| Transit time | 21:46 |
| Equatorial coordinates | RA: 21h 52m 00s", Dec: 55° 47' 48s |
| Magnitude | 6 |
| Constellation | Cepheus |
The graph illustrates the annual visibility pattern of 21520 5548, 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 see when 21520 5548 is visible throughout the year in a table with exact rise, transit, and set times for each date.
You can also see when 21520 5548 is visible throughout the year in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of 21520+5548
Coordinates and Visibility
| Right Ascension | 21h 52m 01s |
| Declination | 55° 47′ 48″ |
| Magnitude | 5.64 |
| Constellation | Cepheus |
| Elevation | 68.4° |
| Azimuth | 26.2° |