SaratogaSkies Jim Solomon's Astropics

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December: Test shots with new scopes/mounts

Dec 21: TMB 80/480 Arrives!

Dec 3: AP1200 Arrives!

Nov 30: TMB 152/1200 Arrives!

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Sh 2-157 (Emission Nebula)

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: Orion ED80 (80mm f/7.5 APO Refractor)
Configuration: Focal Reduced
Additional Optics: William Optics 2" APO 0.8x Reducer/Field Flattener
Filter: None
Effective Focal Length: 480mm
Effective Focal Ratio: f/6
Exposure: 28 x 8min @ ISO 800
Total Exposure: 3hrs, 44min
Date: 12/18/2006 7:02:16 PM PST (start)
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, ASINH stretching
  • Photoshop: Levels, cropping, JPG conversion

Image Description:

This is Sh 2-157 et. al., an interesting field straddling the constellations of Cassiopeia and Cepheus. Also present is the Bubble Nebula, aka NGC 7635 (click here for my closeup shot) and NGC 7538, another emission nebula. Open Cluster NGC 7510, right, is best seen in the higher resolution image. The brighter nebulae in this shot shine through pretty well, but Sh 2-157 is very faint and needs a better night, more exposure time, and/or some Hα exposures to bring it out. Mouse over the image to see the annotations. A higher resolution image is also available. 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)   [obsolete]

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: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 88 x 4min @ ISO 400
Total Exposure: 5hrs, 52min
Date: 5/25/2006 11:02:17 PM PDT (start) and 5/29/2006 10:31:17 PM PDT (start)
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, 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. For some strange reason, this version — with just shy of 6 total hours of expsoure over two nights — came out better than this old version with 32min of exposure time. <grin> I may go back and add some Hα data to this RGB image in order to bring out some of the features; namely, the areas with NGC designations which can be seen by mousing-over the image above. A higher-resolution image is also available. North is up.