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Contains:  NGC 225
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vdB 4 - NGC 225, 


            Gary Imm
vdB 4 - NGC 225

vdB 4 - NGC 225

Technical card

Resolution: 3252x2484

Dates:Nov. 2, 2018

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 Red 31mm Gen2 I-Series: 120x30" (gain: 139.00) -20C bin 1x1

Integration: 3.0 hours

Avg. Moon age: 24.09 days

Avg. Moon phase: 29.97% job: 2364350

RA center: 0h 43' 16"

DEC center: +61° 53' 13"

Pixel scale: 0.782 arcsec/pixel

Orientation: 87.597 degrees

Field radius: 0.444

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

Data source: Backyard


This image captures three adjacent objects - a dark nebula, a faint blue reflection nebula and an open cluster. The cluster and nebula are located 2000 light years away in the northern constellation of Cassiopeia.

This is a young cluster with many bright blue stars, although plenty of orange stars are also seen throughout the image. The reflection nebula van den Bergh 4 (vdB 4) is seen in the center of the image. Above and to the left of the reflection nebula is the dusty dark nebula LDN 1302. The considerable amount of dust in this area can be seen be looking carefully at the extent of small orange stars throughout the image. The dust has absorbed the blue light of these stars, making them look more red than they actually are.

Unlike many object nicknames, I think that this cluster has an appropriate name. I can actually see the bright star outline of the hull of a boat here, and the nebulosity roughly corresponds to the sail. The "boat" is angled 45 degrees to the left of vertical, as if it is sailing left and down. I added a second, annotated image to help with the recognition.

This is a tough trio of objects to process because the dark nebula and the reflection nebula are very faint and require significant exposure, while the cluster is much brighter and is easily overexposed.



Gary Imm
License: None (All rights reserved)


  • Final
    vdB 4 - NGC 225, 


            Gary Imm
  • vdB 4 - NGC 225, 


            Gary Imm


Sailboat outline

Sky plot

Sky plot


vdB 4 - NGC 225, 


            Gary Imm