M39 Observation Details
M39 Daily Motion
M39 will be visible until February, 3, 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.
M39 Visibility Timetable on May 09
M39 Rise and Set Timetable
| Time | Elevation | |
| Moon Rise, 87.7% illuminated | 17:00 | 4° |
| M39 rise | 21:51 | |
| Astrosession begin | 22:10 | 1° |
| Astrosession end | 04:44 | 55° |
| Moon Set | 04:47 | 55° |
| Civil sunrise | 05:57 | 67° |
| Sunrise | 06:28 | 71° |
| M39 transit | 07:52 | 79° |
Track M39 Position Throughout the Night
← Fri, 9 May 2025 →
| 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 photos are taken from the Digitized Sky Survey 2 (DSS2), which was produced at the Space Telescope Science Institute (STScI) under NASA contract, using data from the UK Science and Technology Facilities Council (STFC), the European Southern Observatory (ESO), and the National Geographic Society-Palomar Observatory Sky Survey (POSS II).
Special thanks to the National Optical Astronomy Observatory (NOAO), the Royal Observatory, Edinburgh, and the 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 | 04:02 |
| Latitude | 37.751 |
| Longitude | -97.822 |
| M39 elevation | 48° |
| M39 Azimuth | -56° |
Annual motion of M39
| Date | Sat, 10 May 2025 |
| Twighlight start | 22:07 |
| Twighlight end | 04:38 |
| Twighlight duration | 7h 31m |
| Rise | 21:47 |
| Set | 17:50 |
| Elevation at transit | 79° |
| Transit time | 07:48 |
| Equatorial coordinates | RA: 21h 31m 48s", Dec: 48° 26' 17s |
| Magnitude | 5 |
| Constellation | Cygnus |
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 M39 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.
Data Credits
The nebulae information on this page is sourced from the OpenNGC project, developed by Matteo Verga. OpenNGC provides detailed data on the NGC catalog, which is a valuable resource for exploring deep-sky objects such as nebulae.
For more details or to contribute to OpenNGC, visit the official GitHub repository: OpenNGC on GitHub.