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NGC 6140 in Draco



Scope: Celestron 9.25 Edge 235 mm at f/7, Location: Tierra Del Sol - SDAA Club Site, CA,  7 June 2018  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure:  16 x 12 min (2x2 bin) exposure with IR/UV Block filter, 10 x 5 min (2x2 bin) R; 8 x 5 min (2x2 bin) GB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration, equalization, gradient removal - 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 IR/UV Blocking filter exposure stack was used for the luminance layer. High pass sharpening applied. Images processed at 3352 x 2532 resolution. Final Image size is approximately  2600 x 1950.

North is up in this image.   NGC 6140 is a barred spiral with peculiar features. It is classified as SB(s)cd pec. The central bar is easily seen but with some distortion  at its northern end and the associated spiral arm is somewhat disconnected from the central bar. NGC 6140 has a redshift independent median distance estimate of 26 million light years.  But of the three measurements taken for this galaxy, there is a  fair bit of uncertainty - with a STD DEV of 9+ million light years. The distance estimated by redshift is 42 million light years.  There are numerous background galaxies in this field  - but most with neither a redshift or independent distance estimate. The one other galaxy in this field with a distance estimate by redshift is UGC 10376; the distance estimate is 150 million light years. These galaxies and some of the brighter stars are identified in the annotated image..   Horizontal FOV is approximately 38 arc minutes (0.85 arcsec/pix image scale on the full size image).

Image center is located approximately - Equatorial 2000: RA: 16h 22m 44s Dec: +6526'07"


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

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