Open cluster
M67 (M67)
In Cancer (Cnc) • Magnitude 6.9 • 25 arcminutes
Open the free AstroPlanner with M67 pre-selected, scored against your telescope, location, and the live cloud forecast.
One of the oldest known open clusters at 3–5 billion years — comparable in age to our own Sun, extraordinary given that most open clusters disperse within a few hundred million years. Because its stars share a similar age and chemical composition to the Sun, M67 has become a standard reference for studying how Sun-like stars age.
M67 at a glance
| Catalog IDs | M67, N 2682 |
| Type | Open cluster |
| Constellation | Cancer (Cnc) |
| Right ascension | 08h 50m 31s |
| Declination | +11° 49' 12" |
| Apparent magnitude | 6.90 |
| Angular size | 25.0 × 25.0 arcmin |
| Max altitude at 45°N | 57° |
| Best imaging months | Oct, Nov, Dec |
How to image M67
M67 sits in the constellation Cancer at right ascension 08h 50m 31s and declination +11° 49' 12". To frame and integrate it well, AstroPlanner will compute the optimal moonless window for tonight from your location, the field-of-view fit against your sensor and focal length, the suggested total integration time given your aperture and sky Bortle class, and a cloud-aware schedule that drops it from the plan if your nearest cloud forecast spike overlaps the best altitude window.