Deep Sky Object in Winter
Around Sh2-306 (Diffused Nebulae in Puppis)
Click on image to enlarge
| Date & Time: | Dec 28 2025, from 25:33 to 26:45 JST(+0900) |
| Composed 10 shots with 8 minutes exposed |
| 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 |
| 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 |
Objects around Sh2-306 |
This image captures a region on the far western edge of Puppis, near the border with Canis Major.
This area, located a little over 11° ESE of Sirius, contains several red Hα nebulae clustered within a region about 2° across.
Each area is assigned Sharpless Catalog numbers from Sh2-305 to Sh2-309.
All of these nebulae lie at distances of about 13,000 to 14,000 light-years,
and they are thought to be parts of the same interstellar gas cloud that is being ionized separately in each region, causing them to glow red.
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| Sh2-305 / Diffused Nebula, type 2 E |
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| R.A. | 07h 30m 04.1s (2000.0) |
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| Dec. | -18°32' 13" (2000.0) |
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| Apparent Size | 3.0' |
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| Real Size | 12 light yrs. |
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| Magnitude | - |
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| Distance | 13,600 light yrs. |
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| Other IDs | LBN 1048, RCW 8 |
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|
| Sh2-306 / Diffused Nebula, type 5 E |
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| R.A. | 07h 31m 02.4s (2000.0) |
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| Dec. | -19°09' 17" (2000.0) |
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| Apparent Size | 30.0' |
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| Real Size | 120 light yrs. |
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| Magnitude | - |
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| Distance | 13,700 light yrs. |
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| Other IDs | LBN 1050, RCW 10 |
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|
| Sh2-307 / Diffused Nebula, type 3 E |
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| R.A. | 07h 35m 32.9s (2000.0) |
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| Dec. | -18°45' 33" (2000.0) |
|---|
| Apparent Size | 4.0×3.0' |
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| Real Size | 16×12 light yrs. |
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| Magnitude | - |
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| Distance | 13,700 light yrs. |
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| Other IDs | LBN 1051, Gum 7 |
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|
| Sh2-309 / Diffused Nebula, type 4 E |
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| R.A. | 07h 31m 48.0s (2000.0) |
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| Dec. | -19°26' 05" (2000.0) |
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| Apparent Size | 12.0' |
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| Real Size | 48 light yrs. |
|---|
| Magnitude | - |
|---|
| Distance | 13,700 light yrs. |
|---|
| Other IDs | LBN 1053, RCW 13 |
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