SaratogaSkies Jim Solomon's Astropics

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NGC 2392 (Clown Face/Eskimo Nebula)

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Negative Projection (Barlowed)
Additional Optics: TeleVue 2x Barlow
Filter: None
Effective Focal Length: 2250mm
Effective Focal Ratio: f/11.1
Exposure: 20 x 5min @ ISO 200
Total Exposure: 1hrs, 40min
Date: 3/14/2005 8:45:52 PM PST (start)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: Manual
Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow

Processing:

  • IRIS: Dark subtraction, flat field, registration, Kappa-Sigma stacking, Richardson-Lucy deconvolution
  • JimP: White balance, ASINH stretching
  • Photoshop: Compositing, levels, cropping, JPG conversion

Image Description:

This is NGC 2392, a Planetary Nebula in the constellation of Gemini. It is also known as the Clown Face and Eskimo Nebula, for fairly obvious reasons.

I was dissapointed at first with this one, since a straight stack in IRIS provided very poor detail in the nebula region. However, 20 iterations of Richardson-Lucy deconvolution really brought out the detail nicely, particularly in the "fur" region. Unfortunately, though, R-L made the stars look, well, icky, so I composited the deconvolved nebula with a straight stack for the star background in Photoshop. Yes, that's cheating. No, I don't care.

Great care was taken during the aquisition and processing of this image so as not to clip any of the detail in the nebula, including the central star, in order to preserve the colors. This is a crop of the full-size frame. North is up.

 
NGC 2392 (Clown Face/Eskimo Nebula)
SaratogaSkies Jim Solomon's Astropics

Search

Latest news

December: Test shots with new scopes/mounts

Dec 21: TMB 80/480 Arrives!

Dec 3: AP1200 Arrives!

Nov 30: TMB 152/1200 Arrives!

Links:

NGC 2392 (Clown Face/Eskimo Nebula)

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Negative Projection (Barlowed)
Additional Optics: TeleVue 2x Barlow
Filter: None
Effective Focal Length: 2250mm
Effective Focal Ratio: f/11.1
Exposure: 20 x 5min @ ISO 200
Total Exposure: 1hrs, 40min
Date: 3/14/2005 8:45:52 PM PST (start)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: Manual
Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow

Processing:

  • IRIS: Dark subtraction, flat field, registration, Kappa-Sigma stacking, Richardson-Lucy deconvolution
  • JimP: White balance, ASINH stretching
  • Photoshop: Compositing, levels, cropping, JPG conversion

Image Description:

This is NGC 2392, a Planetary Nebula in the constellation of Gemini. It is also known as the Clown Face and Eskimo Nebula, for fairly obvious reasons.

I was dissapointed at first with this one, since a straight stack in IRIS provided very poor detail in the nebula region. However, 20 iterations of Richardson-Lucy deconvolution really brought out the detail nicely, particularly in the "fur" region. Unfortunately, though, R-L made the stars look, well, icky, so I composited the deconvolved nebula with a straight stack for the star background in Photoshop. Yes, that's cheating. No, I don't care.

Great care was taken during the aquisition and processing of this image so as not to clip any of the detail in the nebula, including the central star, in order to preserve the colors. This is a crop of the full-size frame. North is up.

 
M101 (Pinwheel Galaxy)
SaratogaSkies Jim Solomon's Astropics

Search

Latest news

December: Test shots with new scopes/mounts

Dec 21: TMB 80/480 Arrives!

Dec 3: AP1200 Arrives!

Nov 30: TMB 152/1200 Arrives!

Links:

M101 (Pinwheel Galaxy)

[Hα+R G B]

Mouse-over to see annotations. (Requires Javascript) Click to see high-res version.

Image Details:

Camera: Mofidied Canon Rebel XT (350D): Hutech Type I Filter Replacement
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: Celestron/Baader Multi Purpose Coma Corrector (MPCC)
Filter: Hutech Hα Front Filter (HA-FF)
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 88 x 4min @ ISO 400 (RGB), 30 x 8min @ ISO 1600 (Hα)
Total Exposure: 9hrs, 52min
Date: 5/25/2006 and 5/29/2006 (RGB); 6/15/2006 (Hα)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: GADFly 1.0.5
Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow

Processing:

  • IRIS: Dark subtraction, registration, gradient removal
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, HαRGB combination, ASINH stretching
  • Photoshop: Sharpening, Levels, cropping, JPG conversion
  • Neat Image: Noise reduction

Image Description:

This is M101, aka, the Pinwheel Galaxy, a stunning spiral galaxy in the constellation of Ursa Major. Adding 4hrs of Hα to this recent RGB image really brought out the emission nebulae in M101. Note that mousing-over the above image, in addition to displaying the object labels, will switch back-n-forth between the HαRGB image and the standard RGB image, very clearly showing the effect of the additional Hα data. See that RGB image for more details about M101. A higher-resolution image is also available. North is up.