Celestial hemisphere:  Southern  ·  Constellation: Scorpius (Sco)  ·  Contains:  13.44  ·  14.76  ·  19 Sco  ·  19 omi Sco  ·  20 Sco)  ·  20 sig Sco  ·  21 Sco)  ·  21 alf Sco  ·  22 Sco  ·  22 i Sco  ·  23 Sco)  ·  23 tau Sco  ·  356 Liguria  ·  37 Fides  ·  5 Oph  ·  5 rho Oph  ·  Al Niyat (σ Sco  ·  Al Niyat (τ Sco  ·  Alniyat  ·  Alniyat I  ·  Antares  ·  B229  ·  B42  ·  Cor Scorpii  ·  HD146141  ·  HD146330  ·  HD146331  ·  HD146332  ·  HD146353  ·  HD146437  ·  And 132 more.
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Rho Ophiuchi, Dan
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Rho Ophiuchi

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Rho Ophiuchi, Dan
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Rho Ophiuchi

Equipment

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Acquisition details

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Description

Captured at the Cherry Springs Star Party 2022 on June 3 & 4.

This has always been one of my favorite targets and I was glad to finally capture it from dark skies.  The two nights over which this was captured were interrupted by clouds, so this is only 145 minutes of data.   Even some of the frames I included had clouds in them; if I had cut out all frames with clouds I would have been left with almost nothing.  Unfortunately, this was my last image with the ASI294MM camera because I learned that the severe halos in this image were not the fault of my Astronomik filters, but the wide light cone produced by the Rokinon lens.  The 1.25" filters were just too small and stepping up to filters big enough would have been a sizable expense.  So, I have since sold the ASI294MM and all these filters for a OSC camera.

Details:
Rokinon 135 at f/2.4
ASI294MM at bin1, gain 0
Astronomik LRGB filters
RainbowAstro RST-135
60s exposures in each channel (71 mins Lum, 27 mins Red, 21 mins Green, 26 mins Blue)

Acquisition in SGP
Processing in PixInsight

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Rho Ophiuchi, Dan