20339+3515 Position and Visibility Tonight
Where is 20339+3515 right now?
20339+3515 is located in the constellation Cygnus. It is currently above the horizon at an altitude of 40° toward the north-west, with an apparent magnitude of 4.84.
Twilight begins at 23:28 local time. At that moment, 20339+3515 will be 40° above the horizon toward the north-west.
Twilight begins at 23:28 local time. At that moment, 20339+3515 will be 40° above the horizon toward the north-west.
20339+3515 visibility on 2026-09-27
20339+3515 Visible from sunset until early morning
20339+3515 rise and set timetable
| Time | Elevation | |
| 20339+3515 rise | 11:08 | |
Moonrise, 99.8% illuminated  | 16:51 | 61° |
| Sunset | 16:57 | 62° |
| Civil sunset | 17:24 | 67° |
| Twilight start (−12°) | 17:54 | 73° |
| Astronomical observing session begins | 18:25 | 79° |
| 20339+3515 transit | 19:17 | 88° |
| 20339+3515 set | 03:27 | |
| Astronomical observing session ends | 03:33 | -1° |
| Moonset | 06:07 | -16° |
Track 20339+3515 position throughout the night
← 27 September 2026 →
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Star system description: 20339+3515
System 20339+3515 — triple star system, is located in the constellation Cygnus, at coordinates RA: 20h 33m 54s", Dec: 35° 15' 03s.
The primary and secondary magnitudes are 4.84 and 7.30. Their separation is 0.1 arcseconds, at position angle 274°. The magnitude difference is 2.46 magnitudes; the primary is approximately 9.6 times brighter.
The primary is orange; the secondary is blue-white.
The following technical data come from the Washington Double Star Catalog.
The primary and secondary magnitudes are 4.84 and 7.30. Their separation is 0.1 arcseconds, at position angle 274°. The magnitude difference is 2.46 magnitudes; the primary is approximately 9.6 times brighter.
The primary is orange; the secondary is blue-white.
The following technical data come from the Washington Double Star Catalog.
Technical details: 20339+3515
| Property | Value |
|---|---|
| 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) |
| Primary magnitude | 4.84 |
| Secondary magnitude | 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 |
Components of 20339+3515
| Component | Magnitude | Separation (arcseconds) | Position angle |
| AB | 7.3 | 0.1 | 274 |
| AC | 11.87 | 117.6 | 190 |
Data source: Washington Double Star (WDS) Catalog. Maintained by the U.S. Naval Observatory; thanks to the WDS team.
Finder Chart for 20339+3515
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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 | 23:28 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| Elevation | 40° |
| Azimuth | 288° |
Here you can see the current position of 20339+3515 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 20339+3515 Visible Throughout the Year?
20339+3515 will remain visible until January 15, when it moves too close to the Sun and temporarily disappears from the night sky.
| Date | Mon, 28 September 2026 |
| Astronomical observing session begins | 18:19 |
| Astronomical observing session ends | 03:27 |
| Astronomical observing duration | 9h 8m |
| Rise | 11:04 |
| Set | 03:23 |
| Elevation at transit | 88° |
| Transit time | 19:13 |
| Equatorial coordinates | RA: 20h 33m 54s", Dec: 35° 15' 03s |
| Magnitude | 5 |
| Constellation | Cygnus |
The graph illustrates the annual visibility pattern of 20339+3515, 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 20339+3515 is visible throughout the year in a table with exact rise, transit, and set times for each date.
You can also see when 20339+3515 is visible throughout the year in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of 20339+3515
Coordinates and Visibility
| Right Ascension | 20h 33m 54s |
| Declination | 35° 15′ 03″ |
| Magnitude | 4.84 |
| Constellation | Cygnus |
| Elevation | 40.3° |
| Azimuth | 287.7° |