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: 1200x1800

Dates: July 23, 2016

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 job: 1438099

RA center: 246.277 degrees

DEC center: -21.783 degrees

Pixel scale: 24.330 arcsec/pixel

Orientation: 145.369 degrees

Field radius: 7.310 degrees


*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






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

Sky plot

Sky plot


Antares, Blue Horsehead and Dust,