θ Per Position and Visibility Tonight
Where is θ Per right now?
θ Per is located in the constellation Perseus. It is currently above the horizon at an altitude of 74° toward the north-west, with an apparent magnitude of 4.16.
θ Per visibility on 2026-11-06
θ Per Visible all night
θ Per rise and set timetable
| Time | Elevation | |
Moonrise, 18.4% illuminated  | 22:13 | 58° |
| θ Per rise | 08:10 | |
| Moonset | 10:25 | 8° |
| Sunset | 12:23 | 22° |
| Civil sunset | 12:53 | 26° |
| Twilight start (−12°) | 13:25 | 31° |
| Astronomical observing session begins | 13:57 | 35° |
| θ Per transit | 19:14 | 81° |
| Astronomical observing session ends | 00:34 | 35° |
| Twilight end (−12°) | 01:06 | 30° |
| Civil sunrise | 01:38 | 26° |
| Sunrise | 02:08 | 22° |
| θ Per set | 06:18 |
Track θ Per position throughout the night
← 6 November 2026 →
| Time | |
| Altitude | |
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Shift the map to change the time and observe θ Per changing position in the night sky.
Star system description: θ Per
A double or multiple star system in Perseus.
Pair AB has a measured separation of 21.2″; a telescope may be needed to split it.
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: θ Per
| Property | Value |
|---|---|
| System identifier | WDS 02442+4914 |
| Bayer / Flamsteed designation | θ Per |
| Constellation | Perseus |
| System type | multiple star system |
| Right ascension (RA) | 02h 44m 11s" |
| Declination (Dec) | 49° 13' 42s |
| Component | AB |
| Primary magnitude | 4.16 |
| Secondary magnitude | 9.10 |
| Separation (arcseconds) | 21.2″ |
| Position angle | 305° |
| Discovery year | 1782 |
| Last observed | 2023 |
| Spectral type (primary/secondary) | F7V+M1.5 |
| Number of observations | 85 |
4 components are identified in WDS; this is not a count of resolved stars.
Components of θ Per
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 | 4.16 | 9.10 | 21.2″ | 305° | 2023 |
| AC | 4.16 | 11.08 | 94.8″ | 244° | 2002 |
| BC | 9.10 | 11.08 | 90.1″ | 233° | 2016 |
| BD | 5.87 | 17.70 | 6.2″ | 161° | 2004 |
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 θ Per
θ Per Passage Through Night
Double-click to unlock the map.
Current position of θ Per
| Time | 20:28 |
| Latitude | 39.9612 |
| Longitude | -82.9988 |
| Elevation | 74° |
| Azimuth | 311° |
Here you can see the current position of θ Per 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 θ Per Visible Throughout the Year?
θ Per will remain visible until April 9, 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 | 08:06 |
| Set | 06:14 |
| Elevation at transit | 81° |
| Transit time | 19:10 |
| Equatorial coordinates | RA: 02h 44m 11s", Dec: 49° 13' 42s |
| Magnitude | 4 |
| Constellation | Perseus |
The graph illustrates the annual visibility pattern of θ Per, 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 θ Per is visible throughout the year in a table with exact rise, transit, and set times for each date.
You can also see when θ Per is visible throughout the year in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of θ Per
Coordinates and Visibility
| Right Ascension | 02h 44m 12s |
| Declination | 49° 13′ 42″ |
| Magnitude | 4.16 |
| Constellation | Perseus |
| Elevation | 73.9° |
| Azimuth | 311.3° |