Deep Sky Object in Winter
Medusa Nebula (PK205+14.1 in Gemini)
Click on image to enlarge
| Date & Time: | Feb 24 2023, from 22:28 to 23:24 JST(+0900) |
| Composed 8 shots with 8 minutes exposed |
| Optical: | Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3) |
| with IDAS LPS-P1 Light-pollution suppression filter |
| Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN |
| Digital Camera: | Nikon D810A |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080) |
| Device Size...20×20mm |
| Sensitivity...ISO4000, White Balance...Daylight |
| PK205+14.1(Sh2-274) / Planetary Nebula |
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| R.A. | 07h 29m 0.3s (2000.0) |
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| Dec. | +13° 14' 46" (2000.0) |
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| Apparent Size | about 5' |
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| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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This is a large planetary nebula lying around south of Gemini nearby Canis Minor.
You can estimate about 5 arc minutes in diameter from the image, it's one of the largest planetary nebulae in heavens.
But strange to say, the object is not very well known so doesn't be registered in NGC catalogue.
The code of this nebula "PLN" is a minor catalogue of "Strasbourg Catalogue of Planetary Nebulae" that contains 1445 planetary nebulae.
The nebula has an apparent shape of circle, but fairly bright in southeast part so this image shows like the crescent moon.
And the nebula is often called "Medusa Nebula".
Medusa is a name of monster exterminated by Perseus, but a reason why the nebula has such a nickname is not clear.
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Click on image to enlarge
Wide-field image around Medusa Nebula
| Date & Time: | Dec 27 2019, from 26:58 to 28:54 JST(+0900) |
| Composed 24 shots with 5 minutes exposed |
| Optical: | TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3) |
| with IDAS LPS-V4 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...ISO3200 |
This is a wide-field image captured the outer part of the Medusa nebula.
You can appreciate that the extraordinary dimmed gaseous matter has been spread out in mainly northern part with span smaller than a degree.
This image has been cropped with a focal length of 700mm.
