21 Boo Position and Visibility Tonight
Where is 21 Boo right now?
21 Boo is located in the constellation Bootes. It is currently above the horizon at an altitude of 4° toward the north-east, with an apparent magnitude of 4.76.
21 Boo visibility on 2026-11-06
21 Boo Visible from sunset until before midnight
21 Boo rise and set timetable
| Time | Elevation | |
| 21 Boo is always above the horizon | ||
Moonrise, 18.4% illuminated  | 22:13 | 12° |
| 21 Boo transit | 06:48 | 79° |
| Moonset | 10:25 | 51° |
| Sunset | 12:23 | 33° |
| Civil sunset | 12:53 | 29° |
| Twilight start (−12°) | 13:25 | 25° |
| Astronomical observing session begins | 13:57 | 21° |
| 21 Boo is always above the horizon | ||
| Astronomical observing session ends | 00:34 | 29° |
| Twilight end (−12°) | 01:06 | 33° |
| Civil sunrise | 01:38 | 38° |
| Sunrise | 02:08 | 42° |
Track 21 Boo position throughout the night
← 6 November 2026 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe 21 Boo changing position in the night sky.
Star system description: 21 Boo
A double or multiple star system in Bootes.
No reliable observing recommendation is available for the measured pair.
The diagram uses the latest WDS measurements; north is up and east is right. Measurements may be from different years. Unconnected groups are arranged separately; close pairs may merge, and pairs without reliable geometry are omitted.
Technical details: 21 Boo
| Property | Value |
|---|---|
| System identifier | WDS 14162+5122 |
| Bayer / Flamsteed designation | 21 Boo |
| Constellation | Bootes |
| System type | multiple star system |
| Right ascension (RA) | 14h 16m 10s" |
| Declination (Dec) | 51° 22' 01s |
| Component | AB |
| Primary magnitude | 4.76 |
| Secondary magnitude | 7.39 |
| Separation (arcseconds) | 38.8″ |
| Position angle | 33° |
| Discovery year | 1779 |
| Last observed | 2023 |
| Spectral type (primary/secondary) | A7IV+K0V |
| Number of observations | 112 |
3 components are identified in WDS; this is not a count of resolved stars.
Components of 21 Boo
Each row is a separate WDS component pair. Measurements may come from different years.
| Component | Primary magnitude | Secondary magnitude | Separation (arcseconds) | Position angle | Last observed |
|---|---|---|---|---|---|
| AB | 4.76 | 7.39 | 38.8″ | 33° | 2023 |
| AC | 4.76 | 13.51 | 94.4″ | 186° | 2016 |
Notes
- V: Proper motion indicates a physical pair.
Data source: Washington Double Star (WDS) Catalog. Maintained by the U.S. Naval Observatory; thanks to the WDS team.
Finder Chart for 21 Boo
21 Boo Passage Through Night
Double-click to unlock the map.
Current position of 21 Boo
| Time | 20:28 |
| Latitude | 39.9612 |
| Longitude | -82.9988 |
| Elevation | 4° |
| Azimuth | 16° |
Here you can see the current position of 21 Boo 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 21 Boo Visible Throughout the Year?
21 Boo will remain visible until October 24, when it moves too close to the Sun and temporarily disappears from the night sky.
| Date | Sat, 7 November 2026 |
| Astronomical observing session begins | 13:52 |
| Astronomical observing session ends | 00:29 |
| Astronomical observing duration | 11h 37m |
| Rise | 14162+5122 is always up |
| Set | 14162+5122 is always up |
| Elevation at transit | 79° |
| Transit time | 06:40 |
| Equatorial coordinates | RA: 14h 16m 10s", Dec: 51° 22' 01s |
| Magnitude | 5 |
| Constellation | Bootes |
The graph illustrates the annual visibility pattern of 21 Boo, 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 21 Boo is visible throughout the year in a table with exact rise, transit, and set times for each date.
You can also see when 21 Boo is visible throughout the year in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of 21 Boo
Coordinates and Visibility
| Right Ascension | 14h 16m 10s |
| Declination | 51° 22′ 01″ |
| Magnitude | 4.76 |
| Constellation | Bootes |
| Elevation | 4° |
| Azimuth | 15.7° |