Supernova remnant
Jellyfish Nebula (IC443)
In Gemini (Gem) • Magnitude 12.0 • 45 arcminutes
Open the free AstroPlanner with Jellyfish Nebula pre-selected, scored against your telescope, location, and the live cloud forecast.
A galactic supernova remnant in Gemini, bright in Ha.
Jellyfish Nebula at a glance
| Catalog IDs | I 443 |
| Type | Supernova remnant |
| Constellation | Gemini (Gem) |
| Right ascension | 06h 17m 06s |
| Declination | +22° 28' 12" |
| Apparent magnitude | 12.00 |
| Surface brightness | 15.0 mag/arcsec² |
| Angular size | 45.0 × 45.0 arcmin |
| Max altitude at 45°N | 67° |
| Best imaging months | Dec, Jan, Feb, Mar |
How to image Jellyfish Nebula
Jellyfish Nebula sits in the constellation Gemini at right ascension 06h 17m 06s and declination +22° 28' 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.