Astrophoto, Astronomy by C.Petermann

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Astrophotography - CCD Imaging | 2003 - No3

A session at 22/23 March 2003

Last Update: 30 March 2003

Here is a bunch of new images. I am very satisfied with the results. As the GP mounts is running without control, I limited the exposure time to 120 sec. I had still to throw out some images as there is some periodic error.

Imageprocessing I made with

IRIS: Dark Median of 5 dark fields; subtraction; Size scale factor 1.5

AIP4WIN: Brightness scaling, slight deconvolution, noise reduction, TIFF conversion.

The original images were made with a resolution of 385*290 pixel. Darkest objects visible are around 17 mag.

M81 Galaxy

M81

Instrument: Reflector 150/750mm focal mode
Kamera: AlphaMini OES
Exposure time: 14*120 sec with dark field subtraction
Date: 22 March 2003 2109 CET
Note: The image below is the same image, but I have inserted some magnitudes. I believe the limit is better than 17 mag !! My deepest image ever !

M81

M51 Galaxy

M51

Instrument: Reflector 150/750mm focal mode
Kamera: AlphaMini OES
Exposure time: 15*120 sec with dark field subtraction
Date: 22 March 2003 2150 CET
Note:

NGC4656 Galaxy

ngc4656

Instrument: Reflector 150/750mm focal mode
Kamera: AlphaMini OES
Exposure time: 11*120 sec with dark field subtraction
Date: 22 March 2003 2236 CET
Note:

NGC4565 Galaxy

NGC4565

Instrument: Reflector 150/750mm focal mode
Kamera: AlphaMini OES
Exposure time: 14*120 sec with dark field subtraction
Date: 22 March 2003 2316 CET
Note: The image below shows several galaxies I could find in other images and the ESO and STSCI surveys. I have circled them. I also wrote some magnitudes to some stars.