M39 Position and Visibility Tonight
Where is M39 right now?
Twilight begins at 18:37 local time. At that moment, M39 will be 52° above the horizon toward the north-east.
M39 visibility on 2026-08-31
M39 rise and set timetable
| Time | Elevation | |
| M39 rise | 12:05 | |
| Sunset | 17:38 | 42° |
| Civil sunset | 18:06 | 46° |
| Twilight start | 18:37 | 52° |
Moonrise, 91.3% illuminated  | 18:48 | 54° |
| Astronomical observing session begins | 19:10 | 57° |
| M39 transit | 22:01 | 79° |
| Astronomical observing session ends | 03:06 | 35° |
| Twilight end | 03:39 | 30° |
| Civil sunrise | 04:10 | 26° |
| Sunrise | 04:38 | 21° |
| M39 set | 07:57 | |
| Moonset | 08:20 | -1° |
Track M39 Position Throughout the Night
← 31 August 2026 →
| Time | |
| Altitude | |
| Azimuth |
M39 - Open Cluster
M39 is an open cluster located in the constellation Cygnus. It was discovered by Charles Messier in 1764. The cluster contains a relatively sparse population of stars compared to other open clusters in Messier's catalog.
M39 spans about 7 light-years across and contains around 30 stars. The cluster is approximately 800 light-years away from Earth and has an apparent magnitude of 4.6, making it visible to the naked eye under dark skies and easily seen with binoculars or a small telescope.
M39 — Image Gallery
DSS Blue
DSS Red
DSS Near-Infrared
DSS Composite Image
The images come from the Digitized Sky Survey 2 (DSS2), produced at the Space Telescope Science Institute (STScI) under contract with NASA, using data from UK Science and Technology Facilities Council (STFC), European Southern Observatory (ESO), National Geographic Society-Palomar Observatory Sky Survey (POSS II).
Special thanks to National Optical Astronomy Observatory (NOAO), Royal Observatory, Edinburgh, California Institute of Technology for their significant contributions.
Finder Chart for M39
| Object name | M39 |
| Field of view | |
| Limiting magnitude | |
| M39 coordinates | 21.53009, 48.43817 |
| Center coordinates | 21.53009, 48.43817 |
M39 Passage Through Night
Current position of M39
| Time | 16:08 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| Elevation | 28° |
| Azimuth | 49° |
Annual motion of M39
M39 will remain visible until February 3, when it moves too close to the Sun and temporarily disappears from the night sky.
| Date | Tue, 1 September 2026 |
| Twilight start | 19:08 |
| Twilight end | 03:04 |
| Twilight duration | 8h 56m |
| Rise | 12:01 |
| Set | 07:53 |
| Elevation at transit | 79° |
| Transit time | 21:57 |
| Equatorial coordinates | RA: 21h 31m 48s", Dec: 48° 26' 17s |
| Magnitude | 5 |
| Constellation | Cygnus |
You can also view detailed visibility information in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of M39
Coordinates and Visibility
| Right Ascension | 21.53009° |
| Declination | 48.43817° |
| Magnitude | 4.60 |
| Constellation | Cygnus |
| Elevation | 27.9° |
| Azimuth | 48.6° |
Data Credits
The deep-sky information on this page comes from the OpenNGC project developed by Matteo Verga. OpenNGC provides detailed catalog data for nebulae, galaxies, clusters and other deep-sky objects.
For details or contributions, visit the official repository: OpenNGC GitHub.