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Contains:  Blue Snowball, NGC 7662
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NGC7662 Blue Snowball, 


            Jerry Macon
NGC7662 Blue Snowball

NGC7662 Blue Snowball

Technical card

Resolution: 2000x1600

Dates:Nov. 20, 2018Nov. 21, 2018Nov. 23, 2018Nov. 28, 2018Dec. 3, 2018

Astrodon 36mm Ha (5nm) OIII (5nm): 174x10" (gain: 99.00) -15C bin 1x1
Astrodon 36mm Ha (5nm) OIII (5nm): 418x20" (gain: 99.00) -15C bin 1x1
Astrodon 36mm Ha (5nm) OIII (5nm): 169x300" (gain: 99.00) -15C bin 1x1
Astrodon 36mm Ha (5nm) OIII (5nm): 357x5" (gain: 99.00) -15C bin 1x1
Astrodon 36mm Ha (5nm) OIII (5nm): 106x60" (gain: 99.00) -15C bin 1x1

Integration: 19.2 hours

Avg. Moon age: 17.23 days

Avg. Moon phase: 73.88%

Bortle Dark-Sky Scale: 4.00

Temperature: -5.00 job: 2511844

RA center: 351.473 degrees

DEC center: 42.535 degrees

Pixel scale: 0.700 arcsec/pixel

Orientation: 357.880 degrees

Field radius: 0.249 degrees

Locations: Dark Star Observatory, Taos, New Mexico, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


The RGB were taken on the AG12+ASI1600MM at .70 asec/pix, the L on TV127is+ASI183MM at .75 asec/pix. Using L from the TV NP127is refractor effectively eliminates the spikes from the AG12.

This PN is very small, 2.2 arcmin across, and is particularly challenging to bring out the core detail because the core is so bright. A wide range of exposures is required to provide the required dynamic range.

Revision C does not use the 5,10,20 second exposures. I discovered that the 60 + 300 second exposures gave plenty of dynamic range. I also did less of a crop to give a larger FOV.

NGC 7662, also known as the Blue Snowball Nebula or Snowball Nebula, is a planetary nebula located in the constellation Andromeda.

It has a faint central star that is variable, with a magnitude range of 12 to 16. The central star is a bluish dwarf with a continuous spectrum and a computed temperature of about 75,000K. The nuclei of the planetary nebulae are among the hottest stars known.

NGC 7662 is a popular planetary nebula for casual observers. A small telescope will reveal a star-like object with slight nebulosity. A 6" telescope with a magnification around 100x will reveal a slightly bluish disk, while telescopes with a primary mirror at least 16" in diameter may reveal slight color and brightness variations in the interior.



Jerry Macon
License: Attribution Creative Commons


  • NGC7662 Blue Snowball, 


            Jerry Macon
  • Final
    NGC7662 Blue Snowball, 


            Jerry Macon

Sky plot

Sky plot


NGC7662 Blue Snowball, 


            Jerry Macon