Deep Sky Object in Winter
IC443 (Diffused Nebula in Gemini)
Click on image to enlarge
| Date & Time: | Dec 29 2018, from 21:36 to 22:41 JST(+0900) |
| Mosaic of 2 flames with 4min. × 8 shots |
| Optical: | TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3) |
| with IDAS LPS-D1 Light-pollution suppression filter |
| Auto-guided with TAKAHASHI JP Equatorial & SBIG STV |
| Digital Camera: | Canon EOS 6D (Remodeled) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5472×3648) |
| Device Size...36×24mm, Sensitivity...ISO1600 |
Click on image to enlarge
Close-up of Jerry-fish Nebula (IC443)
| Date & Time: | Dec 9 2023, from 27:24 to 28:50 JST(+0900) |
| Composed 8 shots with 10 minutes exposed |
| Optical: | VIXEN 20cm(7.9") VISAC with conversion lens (f=1278mm, F6.4) |
| with LPS-D1 Light-pollution suppression filter |
| Auto-guided with TAKAHASHI JP Equatorial & SBIG STV |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -25°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording format...16bit FITS, converted to 16bit TIFF(6248×4176) |
| Device Size...23.5×15.7mm, Gain...100 |
| IC443 / Supernova Remnant, type 0 E |
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| R.A. | 06h 16m 54.0s (2000.0) |
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| Dec. | +22° 46' 00" (2000.0) |
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| Apparent Size | 27×5' |
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| Real Size | 25 light yrs. |
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| Magnitude | - |
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| Distance | 4900 light yrs. |
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| Other IDs | LBN844, Sh2-248 |
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You can see two orange stars with 3rd magnitudes paralleled in east west direction at the leg of Pollux, the shorter brother of twins.
An invisible H-alpha diffused nebula of IC443 is positioned between those stars.
The eastern edge of IC443 takes a loop structure, and it's considered that a supernova explosion made the shape, gaseous matter is spreading out.
The whole shape gave a nickname of "Jerry fish Nebula", enjoyed only in long-exposure films.
And there is very fine reddish gas of IC444 at the east of IC443.
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