Double Star 20339+3515 Observation Details
20339+3515 Daily Motion
20339+3515 will reach transit at 18:41. By the time twilight starts at 01:31 it will be at an elevation of 12° degrees and will set at 02:50, before twilight ends.20339+3515 will be visible until January, 15, 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.
20339+3515 Visibility Timetable on October 06
20339+3515 Rise and Set Timetable
| Time | Elevation | |
| Moon Rise, 98.2% illuminated | 15:57 | 57° |
| Sunset | 16:43 | 66° |
| Civil sunset | 17:10 | 72° |
| Astrosession begin | 18:10 | 83° |
| 20339+3515 transit | 18:41 | 88° |
| 20339+3515 set | 02:50 | |
| Astrosession end | 03:41 | -6° |
| Moon Set | 04:33 | -12° |
| 20339+3515 rise | 10:28 |
Track 20339+3515 Position Throughout the Night
← Mon, 6 October 2025 →
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Shift the map to change the time and observe 20339+3515 changing position in the night sky.
Where is 20339+3515 right now?
20339+3515 is located in the constellation Cygnus, at right ascension 20h 33m 54s" and declination 35° 15' 03s. At the current time, it is above the horizon at an altitude of 12 degrees toward the northeast from your location, with an apparent magnitude of 4.84.20339+3515 Star System Description
20339+3515 is Triple Star System located in constellation Cygnus at coordinates RA: 20h 33m 54s", Dec: 35° 15' 03s.
The primary component has a magnitude of 4.84, while the secondary component has a magnitude of 7.30. They are separated by 0.1 arcseconds at a position angle of 274 degrees. The brightness difference between the two components is 2.46 magnitudes, with the primary component being approximately 9.6 times brighter than the secondary.
The primary star is orange in color, and the secondary star is blue-white.
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 4.84, while the secondary component has a magnitude of 7.30. They are separated by 0.1 arcseconds at a position angle of 274 degrees. The brightness difference between the two components is 2.46 magnitudes, with the primary component being approximately 9.6 times brighter than the secondary.
The primary star is orange in color, and the secondary star is blue-white.
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 20339+3515
| Property | Value |
|---|---|
| Star System Identifier | 20339+3515 |
| System Type | Triple Star System |
| Primary Star | 47 Cyg |
| Right Ascension (RA) | 20.56503 (20h 33m 54s") |
| Declination (Dec) | 35.25086 (35° 15' 03s) |
| Magnitude (Primary) | 4.84 |
| Magnitude (Secondary) | 7.30 |
| Spectral Type (Primary/Secondary) | K2Ib+B3V (orange/blue-white) |
| Separation (Arcseconds) | 0.1 |
| Position Angle | 274° |
| Discovery Year | 1949 |
| Last Observed | 1998 |
| Primary Proper Motion (Ra, Dec) | +002-005 |
| Secondary Proper Motion (Ra, Dec) | |
| Number of Observations | 27 |
20339+3515 Components
| Component | Magnitude | Separation (arcseconds) | Position Angle |
| AB | 7.30 | 0.1 | 274 |
| AC | 11.87 | 117.6 | 190 |
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 47 Cyg
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| Object name | 20339+3515 |
| Field of view | |
| Limiting magnitude | |
| 20339+3515 coordinates | 20.56503, 35.25086 |
| Center coordinates | 20.56503, 35.25086 |
20339+3515 Passage Through Night
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Current position of 20339+3515
| Time | 01:31 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| 20339+3515 elevation | 12° |
| 20339+3515 Azimuth | 54° |
Here you can see the current position of the 20339+3515 on the map, as well as its positions for rise and set. This tool allows you to track the 20339+3515's movement throughout the night, providing you with accurate and up-to-date information.
Annual motion of 20339+3515
| Date | Tue, 7 October 2025 |
| Twighlight start | 18:05 |
| Twighlight end | 03:35 |
| Twighlight duration | 10h 31m |
| Rise | 10:28 |
| Set | 02:46 |
| Elevation at transit | 88° |
| Transit time | 18:37 |
| Equatorial coordinates | RA: 20h 33m 54s", Dec: 35° 15' 03s |
| Magnitude | 5 |
| Constellation | Cygnus |
The graph illustrates the annual visibility pattern of a 20339+3515, 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 20339+3515 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 20339+3515 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.
Astrometric & Physical Parameters of 20339+3515
Coordinates & Visibility
| Right Ascension | 20.56503° |
| Declination | 35.25086° |
| Magnitude | 4.84 |
| Constellation | Cygnus |
| Elevation | 11.8° |
| Azimuth | 54.4° |