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Sh2-302 - Snowman Nebula, 


            Gary Imm
Sh2-302 - Snowman Nebula

Sh2-302 - Snowman Nebula

Technical card

Resolution: 3816x2778

Dates:Dec. 21, 2018Jan. 4, 2019

Astrodon Blue 31mm Gen2 I-Series: 120x30" (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 120x30" (gain: 139.00) -20C bin 1x1
Astrodon Ha 31mm 5nm: 36x300" (gain: 300.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 120x30" (gain: 139.00) -20C bin 1x1

Integration: 6.0 hours

Avg. Moon age: 20.73 days

Avg. Moon phase: 50.05% job: 2460850

RA center: 112.914 degrees

DEC center: -16.998 degrees

Pixel scale: 0.783 arcsec/pixel

Orientation: 240.921 degrees

Field radius: 0.513 degrees

Locations: Backyard (Mag 20.8), Onalaska, Texas, United States

Data source: Backyard


This object is the only snowman I get to see all winter. The image contains three objects - an emission nebula, a reflection nebula, and an open star cluster - all located in the southern constellation of Puppis.

The primary object is the red emission nebula, located 6000 light years away with a diameter of 36 light years. This nebula is also known as RCW7 and Gum 6. The nebula is crossed by a dark dust lane. Similar to the structure of a snowman, the nebula seems to consist of two overlapping circular areas, one twice as large as the other. The "snowman" appears to be wearing a belt of bright stars around his waist.

Above and to the right of the nebula is the pretty blue reflection nebula, vdB 97. Opposite vdB 97, on the left side of the nebula, is the small but striking open cluster NGC 2409 . These two objects form the "arms" of the snowman. A few other white and yellow small reflection nebulae are seen on the right side of the snowman.

Dust is prevalent in the lower half of the image, as seen in the orangish tint of the background star field. Also, there are a few interesting straight line star asterisms sprinkled throughout the image. Two of the most intriguing are at upper left and center left.



Gary Imm
License: None (All rights reserved)

Sky plot

Sky plot


Sh2-302 - Snowman Nebula, 


            Gary Imm