SaratogaSkies Jim Solomon's Astropics

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Jupiter and its Moons

Image Details:

Camera: Philips ToUcam Pro II (840k)
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: 2400mm
Effective Focal Ratio: f/12
Exposure: 300 @ 1/50s, 5fps, gain=19%
Date: 4/26/2005, 1:22 AM PDT
Location: Saratoga, CA, USA
Acquisition: Philips VRecord
Focus: Manual
Dithering: None
Guiding: None

Processing:

  • IRIS: Registration, best-frame selection, stacking, color alignment, wavelet processing
  • Photoshop: Levels, white balance, image size, JPG conversion

Image Description:

This is a composite of Jupiter and its moons taken with a webcam through my Newtonian. A second (non-normalized) stack was layered on top of the main one in Photoshop in order to bring out the rather faint moons Callisto and Europa. Compare this webcam image with the old one taken with a Digital Rebel. No comparison, even though the seeing was equally lousy on the nights these images were taken, respectively. This is probably my best planetary image to date. Earth's North is up.

 
M86 & M84 (Virgo Galaxy Cluster)
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:

M86 & M84 (Virgo Galaxy Cluster)

Click to see high-res version.

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Canon EF 200mm f/2.8L II USM lens
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: Promaster 72mm UV Filter
Effective Focal Length: 200mm
Effective Focal Ratio: f/2.8
Exposure: 21 x 2min @ ISO 400
Total Exposure: 0hrs, 42min
Date: 5/10/2005 11:01:57 PM PDT (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, registration, gradient removal
  • JimP: Kappa-Sigma Stacking, White balance, ASINH stretching
  • Neat Image: Noise reduction
  • Photoshop: Levels, annotation, cropping, JPG conversion

Image Description:

This image is a "do over" of my "first light" image with a new Canon EF 200mm f/2.8L II USM lens. It's 200mm focal length gives a generous 630' x 420' field of view in the Digital Rebel (300D). The crop shown above is a portion of the galaxy-rich region in the constellation of Virgo known as Markarian's chain. This version has much more exposure time than the original and shows more detail with less noise. The upper-left to lower-right smearing is the result of guiding error, differential flexure in the adpater plate, the lens being slightly out of collimation, or a combination of these factors. Need to get to the bottom of this. North is up in the above image. Be sure to check out the entire annotated field from which the above image is cropped. (Note: North is right in the full image.)