NGC 4725

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This galaxy pair is in Coma Berenices. NGC 4725 is on the right at magnitude 9.7 and measures 10.9 x 7.2 arc minutes in size. NGC 4712 is on the left at magnitude 13.7 and measures 2.3 x 0.9 arc minutes in size. The angular separation between the two is 12.0 arc minutes. North is down and East is to the right.

Image Information:

Date(s) May 25 - 28, 2006 (4 nights)

Optics Takahashi BRC-250 10 inch f/5 Ritchey-Chrétien astrograph with a 1,268 mm focal length

Mount Losmandy G-11 with Gemini Level 3 V 1.1

Camera SBIG ST-10XME

Guiding Internal selfguiding on GSC 1990:3034 at magnitude 10.5

Field Scale 1.10 arc seconds / pixel

FOV 40 x 27 arc minutes

Chip Temperature -15 C

Filter(s) SBIG standard RGBC in a CFW-8A

Location Shaver Lake, California 5610 feet at 37^o 04.33' N 119^o 20.33' W

Exposure(s) L = 17x1200, R = 6x1200, G = 7x1200, B = 11x1200 seconds (13 2/3 hours total)

Binning L = 1x1, RGB = 2x2

Camera control CCDSoft V 5.00.174

Processing software MaxIm DL V 4.53, Photoshop CS2 V 9.0

Image notes North is down and East is to the right. On the first night of imaging, 7 subframes with the clear filter for the luminance channel were collected. All subframes for this image were twenty minute (1200 second) exposures. The second night of imaging produced 10 more luminance subframes. On the third night, it snowed, yes snowed for about an hour around sunset. It then cleared so that 6 red and 7 green subframes could be collected. The fourth night produced 11 blue channel subframes. All images were fully calibrated in MaxIm DL and kept in a floating point FITS format. Deblooming was done with Ron Wodaski's Debloomer plugin. Images were meadian combined in MaxIm DL. The RGB channels were combined in MaxIm DL and converted to a 16 bit TIFF along with the luminance channel. The RBG and L TIFFs were combined and further processed in Photoshop CS2. This image is a stack of 41 frames total. This image has not been cropped.

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Date(s)	May 25 - 28, 2006 (4 nights)
Optics	Takahashi BRC-250 10 inch f/5 Ritchey-Chrétien astrograph with a 1,268 mm focal length
Mount	Losmandy G-11 with Gemini Level 3 V 1.1
Camera	SBIG ST-10XME
Guiding	Internal selfguiding on GSC 1990:3034 at magnitude 10.5
Field Scale	1.10 arc seconds / pixel
FOV	40 x 27 arc minutes
Chip Temperature	-15 C
Filter(s)	SBIG standard RGBC in a CFW-8A
Location	Shaver Lake, California 5610 feet at 37^o 04.33' N 119^o 20.33' W
Exposure(s)	L = 17x1200, R = 6x1200, G = 7x1200, B = 11x1200 seconds (13 2/3 hours total)
Binning	L = 1x1, RGB = 2x2
Camera control	CCDSoft V 5.00.174
Processing software	MaxIm DL V 4.53, Photoshop CS2 V 9.0
Image notes	North is down and East is to the right. On the first night of imaging, 7 subframes with the clear filter for the luminance channel were collected. All subframes for this image were twenty minute (1200 second) exposures. The second night of imaging produced 10 more luminance subframes. On the third night, it snowed, yes snowed for about an hour around sunset. It then cleared so that 6 red and 7 green subframes could be collected. The fourth night produced 11 blue channel subframes. All images were fully calibrated in MaxIm DL and kept in a floating point FITS format. Deblooming was done with Ron Wodaski's Debloomer plugin. Images were meadian combined in MaxIm DL. The RGB channels were combined in MaxIm DL and converted to a 16 bit TIFF along with the luminance channel. The RBG and L TIFFs were combined and further processed in Photoshop CS2. This image is a stack of 41 frames total. This image has not been cropped.