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NGC 1491 in Perseus



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA 18 November 2017,  Camera: Atik 383L (Astronomik Gen 2 Ha LRGB Filters)

Exposure: Exposure: 12 x 10 min  (1x1 bin) exposure with UV/IR block, 12 x 10 minutes (2x2 bin)  exposure with Hydrogen Alpha filter, 8 x 4 min (2x2 bin) RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration, equalization - Astroart.  Curves, Levels, RGB combine - ImagesPlus. Luminance Layering, final stretch, and finishing  - Photoshop.  RGB calibration - eXcalibrator. This image is a  RGB combine with Luminance layering.  Color saturation in LAB color.  The H-Alpha filter exposure was screen blended into the IR/UV Blocking filter exposure stack and used for the luminance layer. Ha was screen blended into the Red channel -  emission balance of RGB done with Channel Mixer in Photoshop. Images processed at 3352 x 2532 resolution. Final Image size is approximately  2600 x 1950.

North is up in this image.  The primary object in this image is LBN 705. The better known object in NGC 1491 which is the small bright portion of the larger LBN 705. NGC 1491 is also known as Sharpless 206 and LBN704. Below this relatively bright emission complex is a dimmer emission nebula LBN 706. The open cluster King 7  is in the upper right. This cluster is about 7,170 light years distant from Earth.  Below King  7 and to the left a little is the small reflection nebula GM 1-34. This is from the Gyulbudaghian+Maghakian catalog of new HH-like reflection nebulae. There are also a few background galaxies in the image as well. These objects  and some of the brighter stars are identified in the annotated image.  This image replaces an earlier image that can be seen in the Archives here.  Horizontal FOV is approximately 120 arc minutes.

Image center is approximately - Equatorial 2000: RA: 04h 02m 50.4s Dec: +5120'24"


All images and content remain the property of Jim Thommes - copyright 2003 - 2018

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