20140815 AR2139_2141 DS

20140815 AR2139 2141 DS


AR 2139 is in the approximate center, AR 2141 is the two dark features to the left on the edge.

Converted from grey scale to color.

North is up.

Imaging Site: My front-yard in San Diego, Ca. It was one of those rare mornings that we didn't have the marine layer, so took advantage of the steady skies just after sunrise before the Sun starting heating the rooftops up. 

Date: 15 Aug 2014

Scope and f/: Lunt LS100THa (Hydrogen-Alpha filtered) with BF1800 at f/17.5 (via a installed 2.5x Powermate). The DSII (double stack filter) is also installed.

Mount: Takahashi NJP.

Guiding: None.

Camera: Point Grey Grasshopper Express (GX-FW-60SM-C) monochrome video camera with a ICX694 sensor. Camera is operating in 1368x1096 Format 7 mode with hardware ROI set to 680x680 to maximize the FPS.

Camera temperature: 125.6 F (52 C)

Camera binning: I'm not positive, but the camera appears to do 2x binning in 1368x1096 format 7, as the FOV remains the same as at the camera's native resolution, but I have to greatly reduce the exposure to keep from saturating the sensor.

Number of sub-images and exposure: Stacked 220 images from the 1501 frame captured video.

Filters: Installed a IR block filter for grins, I can't tell if it made a difference or not.

Image Calibration: Automatic flat processing during capture via Astro IIDC.

Control, capture and processing with: Astro IIDC and Photoshop on a Mac.

Images may be used for personal and/or educational use only.