The Jellyfish Nebula in H-alpha
The Jellyfish Nebula, also known as IC443 and Sharpless 248 (Sh2-248), is a galactic supernova remnant (SNR) that lies roughly 5,000 light years from Earth in the constellation Gemini. While this remnant's age is still uncertain, some agree that the progenitor supernova happened between 3,000 and 30,000 years ago. As compared to our full moon at 30 arcmin across, IC443 has an angular diameter of 50 arcmin. That, combined with its estimated distance from Earth, corresponds to a physical size of roughly 70 light years.
- Telescope: Stellarvue Raptor SVR105 @ f/7
- Accessories: Stellarvue SFF7-21 flattener; Dew control by Dew Buster; Alnitak Flat-Man
- Mount: Takahashi EM-200 Temma2
- Camera: QSI583wsg CCD @ -25.0C
- Guiding: Starlight Xpress Lodestar via PHD
- Filters: Astrodon 5nm Ha
- Exposure: 18 x 20min.
- Acquisition: ImagesPlus 4.3 Camera Control
- Processing: Calibration, DDP in Images Plus v4.5; Registration in Registar
- Post-processing: ImagesPlus 4.5; Adobe Photoshop CS5
- Date(s): January 5, 2012
- Temperature (begin - end): 45.3ºF - 31.6ºF
- Moon data: Waxing Gibbous - 90%
jellyfishjellyfish nebulaic443ic 443sharpless 248hahydrogen alphahiisharpless