Deep Sky Object in Winter
Sh2-299 & Sh2-300 (Diffused Nebulae in Puppis)


Date & Time: Dec 24 2022, from 25:46 to 26:40 JST(+0900)
Composed 10 shots with 6 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


Sh2-299 / Diffused Nebula
R.A.07h 30m 41.7s (2000.0)
Dec.-15°17' 40" (2000.0)
Apparent Size1.0'
Real Size4 light yrs.
Magnitude -
Distance13700 light yrs.
Other IDs -
Sh2-300 / Diffused Nebula
R.A.07h 31m 08.4s (2000.0)
Dec.-15°25' 12" (2000.0)
Apparent Size3.0'
Real Size12 light yrs.
Magnitude -
Distance13700 light yrs.
Other IDs -
Two small diffused nebulae lined up in Puppis near the border with Canis Major. They are located about 11 degrees east of Sirius, and a major open cluster M47 in Pupis can be found at 1.6 degrees northeast of these nebulae. The nebula on the upper right of the image is Sh2-299 with a size of about an arc minute, and another on the lower left is Sh2-300 with an apparent diameter of 3 arc minutes. The separation angle between them is about 10 minutes. Both have low surface brightness; it is difficult to recognize their shape without long exposure. Red Hα and blueish reflection components are recognized inside Sh2-299.



The Angel Fish
Sh2-301

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