Webcam images of Mars - 16 July 2003

Mars learning curve Index

What percentage gamma should I use for my webcam?

Date: 16 July 2003 Telescope: 10 inch SCT AVI: 1/10 sec for 120 seconds at 5 fps
Time: 05:26 - 05:41 (GMT + 2h00) Camera: Logitec Quickcam Pro 4000 Processing: 100 and 150 frames stacked
Observatory: Hartbeespoort Magnification: 3x Tele Vue Barlow Software: K3CCDTools and Photoshop

Mars Apparent Diameter: 19.4 " Illuminated Fraction: 0.925 Distance from Earth: 0.4837 ua Central meridian: 48.52 (at 5:30)

From left to right: zero, 30, 40 and 50 percent gamma. Unfortunately I spend most of this night capturing AVIs at 50 percent gamma. A lower setting would have given me more detailed images. But, now I know what gamma settings to use for the remainder of the Mars apparition of 2003.

What percentage saturation should I use for webcam astrophotography?

Date: 16 July 2003 Telescope: 10 inch SCT AVI: 1/10 sec for 75 and 480 seconds at 5 fps
Time: 02:30 (GMT + 2h00) Camera: Logitec Quickcam Pro 4000 Processing: 100 frames stacked
Observatory: Hartbeespoort Magnification: 3x Tele Vue Barlow Software: K3CCDTools and Photoshop

Mars Apparent Diameter: 19.4 " Illuminated Fraction: 0.926 Distance from Earth: 0.4837 ua Central meridian: 4.62

From left ot right: Webcam capture settings for the AVIs were: 50, 75 and 100 percentage saturation.

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