Contains: NGC 6528, NGC 6522, The star Alnasl (γ2Sgr)
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Bat-eared fox nebula (B 295 and LDN 1788)

Technical card

Imaging telescope or lens: FSQ-106ED

Imaging camera: QHY CCD QHY16200A

Mount: Astro-Physics AP MACH1 GTO

Guiding camera: QHY5L-II mono

Software: Adobe Photoshop CC 2017PixInsight

Filter: Baader LRGB 2" Filters

Accessory: Stardome

Resolution: 4505x3610

Dates: Aug. 25, 2017

Frames: 33x300"

Integration: 2.8 hours

Avg. Moon age: 3.84 days

Avg. Moon phase: 15.75%

Astrometry.net job: 1715514

RA center: 270.056 degrees

DEC center: -31.078 degrees

Pixel scale: 2.326 arcsec/pixel

Orientation: 1.577 degrees

Field radius: 1.865 degrees

Locations: Bellatrix Observatory, Oliveira, Brazil

Description

The bat-eared fox (Otocyon megalotis) is a species of fox found on the African savanna, named for its large ears, which are used for thermoregulation. (Wikipedia)

This high resolution large field (2.3 degrees X 2.9 degrees) in the constellations Sagittarius/Ophiuchus shows the dark nebulae B 295 (to the right and below the bright star Alnasl) and LDN 1788 (upper right corner). The pair of globular clusters NGC 6528 / NGC 6522 appears at top left. The small dark nebula B 298 is shown near NGC 6528.

The dark nebulae LDN 1788 and B 295 together resemble a walking bat-eared fox, representing the head and hind legs with the tail, respectively.

This rarely photographed area has relative low brightness within the Milky Way, and is highly reddened by interstellar dust. I show here several versions, with different parameters of the Photometric Color Calibration process of PixInsight. Version A compensates for the interstellar absorption. Version B is more realistic, and uses the standard spiral galaxy photometry. Version C is midway between versions A and B. Version D is a less aggressive (and darker) processing, and perhaps more pleasing on a 4K monitor.

The inset fox photograph was obtained from https://wallpaperscraft.com/download/bat_eared_fox_walk_fox_96954/3740x2584.
Thanks to J. Barros from SONEAR.

Thanks for watching!

Comments

Author

Luiz Duczmal
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Revisions

B

Version A compensates for the interstellar absorption, and shows bluer stars. It also includes the inset fox photograph. Version B is more realistic, and uses the standard spiral galaxy photometry.

C

Version C is midway between versions A and B.

D

Version D is a less aggressive (and darker) processing, with more nuanced detail, and perhaps more pleasing on a 4K monitor.

Sky plot

Sky plot

Histogram

Bat-eared fox nebula (B 295 and LDN 1788), 




    

        Luiz Duczmal