Contains: IC 4605, rho Oph nebula, IC 4604, IC 4603, M 4, NGC 6121, IC 4601, IC 4592, The star ψOph, The star οSco, The star ωOph, The star χOph, The star ω2Sco, The star νSco, The star ω1Sco, The star Al Niyat (σSco), The star Graffias (β1Sco), The star Antares (αSco), Part of the constellation Scorpius (Sco)
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Antares, Blue Horsehead and Dust

Technical card

Resolution: 1600x2400

Dates: July 23, 2016

Frames:
10x180" ISO800
13x240" ISO800

Integration: 1.4 hours

Darks: ~6

Bias: ~30

Avg. Moon age: 18.44 days

Avg. Moon phase: 85.50%

Mean SQM: 21.50

Mean FWHM: 5.45

Temperature: 8.40

Astrometry.net job: 1406013

RA center: 246.277 degrees

DEC center: -21.782 degrees

Pixel scale: 18.249 arcsec/pixel

Orientation: 145.370 degrees

Field radius: 7.311 degrees

Description

*Please check the full image 2400px - resized from original)*

Constructive criticism, comments and suggestions are more than welcome in the comments section. Thank's for taking your time to look at this image.

Taken from Rural Skies (Bortle 3-4; NELM ~6.2; SQM ~21.5*calculated), from Cristina, MG, Brazil (22ºS latitude).

Date and Time: July 23rd, 2016, at 20:00h (UTC-3, start of capture)
Camera: Unmodded Canon T5/1200D, at ISO 800
Lens: Nikon 105mm f/2.5 AI, operated at f/4.0
Mount: Sky-Watcher HEQ5, tracking, controlled with EQASCOM, unguided
Exposure Detail: 13x240s (52min) + 10x180s (30min) - TOTAL: 82min

Comments

Author

grsotnas
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Revisions

B

Heavier star shrinking/stretching to better show nebulosity, however stars look overprocessed at 100%

Sky plot

Sky plot

Histogram

Antares, Blue Horsehead and Dust, grsotnas