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Jupiter 2012/11/17 (IR filter) | by s58y
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Jupiter 2012/11/17 (IR filter)

Second light Jupiter test images (with IR filter) -- 200% crop

 

Target: Jupiter and Ganymede.. Note that Ganymede disppeared after frame 8, presumably going into the shadow behind Jupiter. Notice how much Jupiter rotates in less than 3 hours.

 

Image Scale = 0.29 arc-second/pixel (on sensor, 0.15 after 2x drizzle)

Date: 2012/11/17 and 2012/11/18 21:25 to 00:06 (24:06)

 

Exposure: 13 videos are shown here:

 

(1) 21:25 - 30fps, gain=604, 5004 frames, best 3000 (PIPP), then best 1500 (Registax)

(2) 21:43 - 30fps, gain=???, 10002 frames, best 5000 (PIPP), then best 2500 (Registax)

(3) 21:59 - 15fps, gain=442, 2505 frames, best 1500 (PIPP), then best 750 (Registax)

(4) 22:27 - 60fps, gain=807, 10031 frames, best 5000 (PIPP), then best 2500 (Registax)

(5) 22:35 - 30fps, gain=625, 5003 frames, best 3000 (PIPP), then best 1500 (Registax)

(6) 22:42 - 15fps, gain=449, 2501 frames, best 1500 (PIPP), then best 750 (Registax)

(7) 22:48 - 7.5fps, gain=287, 1252 frames, best 800 (PIPP), then best 400 (Registax)

(8) 22:59 - 30fps, gain=631, 5003 frames, best 3000 (PIPP), then best 1500 (Registax)

(9) 23:29 - 60fps, gain=807, 10028 frames, best 5000 (PIPP), then best 2500 (Registax)

(10) 23:46 - 30fps, gain=???, 5009 frames, best 3000 (PIPP), then best 1500 (Registax)

(11) 23:49 - 60fps, gain=793, 10007 frames, best 5000 (PIPP), then best 2500 (Registax)

(12) 00:00- 30fps, gain=625, 5001 frames, best 3000 (PIPP), then best 1500 (Registax)

(13) 00:06- 60fps, gain=780, 10008 frames, best 5000 (PIPP), then best 2500 (Registax)

 

Telescope: Celestron EdgeHD 800 (8-inch) with 2x powermate = 4000mm at f/20 (approx)

Camera : DMK21AU618

Filter: Baader 685nm IR-Pass-Filter

Mount: Astro-Physics AP900 -- rough polar alignment (no drift alignment)

 

Processing:

 

Seeing was bad, so the IR filter was used to steady the image. In-focus collimation was only approximate, since the first ring was very unsteady, even through the IR filter.

 

The AVI files from the video camera were too large for Registax, and AutoStakkert 2 drizzle processing did not work well. So, PIPP (Planetary Imaging PreProcessor v2.1.9) was used to crop the videos down to include just Jupiter or Jupiter and Ganymede. Also, only 1/2 to 2/3 the best frames were kept for each video, to further reduce the video size input to Registax.

 

For each of the 13 videos, Registax 6 was then used to stack the best half of the input frames from PIPP, using 2x drizzle processing. Non-linked, single-stage Gaussian wavelet processing in Registax was then applied to sharpen the stacked image. In Photoshop CS5.1, the Registax output was rotated, cropped, converted to grayscale, and levels-adjusted to use the whole availble brightness range. The 13 images were combined, labeled, and converted to JPEG with quality 12.

 

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Taken on November 17, 2012