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Derek Santiago | all galleries >> Galleries >> Planetary Nebulae and SN Remnants > NGC 7662 Blue Snowball Halo LRGBO
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NGC 7662 Blue Snowball Halo LRGBO

I had initially attempted a deep image of NGC 7662, the Blue Snowball, a planetary nebula in the constellation Andromeda in 2009. I had assumed the halo was a filter reflection, but was later able to find a few images with a hint of a similar halo, and with long OIII subs I was able to define it a bit better. The nebula core spans approximately 0.5 arc minutes and the extended halo more than 2.5 arc minutes. A close up of the core rim reveals a hint of the "fliers" (fast low ionization emission), knots of dense gas that were ejected from the central star before the main nebula regions. The ansae seen at the poles of the elliptical shell are also apparent. What is again seen here which I noted a few years ago is what appears to be a separate jet of ejected gasses further from the halo seen at around the 3 o'clock position. This has not previously been described. It was suggested that it might be a cluster of galaxies, but this is unlikely as it very prominent in OIII in a density similar to the main nebular halo suggesting that it truly is ejectate. These are the details of my latest attempt:

Imaging Camera: QSI540wsg
Imaging Scope: Meade 10"LX200R at F/10
Mount: Meade LX200 Fork on Milburn Wedge
Guide Camera: SX Lodestar
Filters: Astrodon 5nm OIII, I-series gen II LRGB
Exposure: Six hours OIII(15 min subs,binned x 2)and three hours RGB (5 min subs binned x 2)for the nebula halo and background. Two hours of 20-30sec LRGB and OIII subs were combined for the core of the nebula. The halo was seen in the stretched blue stack and faintly in the green subs. The OIII was incorporated into these channels in approximate proportions, attempting to maintain reasonable color integrity.

Processing: CCD Stack and PS CS2.
Date: 9/14/12 to 9/19/12
Location: My front driveway. Morristown, NJ

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