Tag Archives: Rho Ophiuchi

Rho Ophiuchi

The Rho Ophiuchi cloud complex is a large star-forming region in the constellation Scorpius. The bright red supergiant star, Antares, is a prominent feature in the area, and reflects its light off the nearby clouds of gas.

Imaging telescopes or lenses: Canon EF 70-200mm f2.8 L2 at 135mm, f/3.2
Software: PixInsight, BinaryRivers BackyardEOS, Calibration, reduction, and integration with PixInsight
Post-processing with PixInsight
Imaging cameras: Canon 60Da
17x 5min ISO800
Calibrated with darks, flats, bias

Author: Cory Schmitz
AstroPhotography of the day by SPONLI
19 June 2014

IC 4604 in Ophiuchus

4baab1ed6c154d2a2f332c7018c6de62.1824x0_q100_watermark_watermark_opacity-25_watermark_position-6_watermark_text-Copyright Jose Fco. del Aguila

Rho Ophiuchi is a triple star system located at the southern end of the constellation Ophiuchus near de limit with Scorpius.
The stars are embedded in a large blue reflection nebulosity catalogued as IC 4604 which is mixed with several filaments of dark nebulae. This region is also part of a larger dust and nebulosity region known as the Rho Ophiuchus / Antares complex.

Imaging telescopes or lenses: Sky-Watcher 200/1000 Black Diamond
Imaging cameras: Canon EOS 450D
Mounts: CGEM
Guiding telescopes or lenses: Lunatico Astronomia EZG-60
Guiding cameras: ZW Optical ASI120MC
Software: PHD Guiding, Incanus APT – Astro Photography Tool, PixInsight Core 1.8
Accessories: Baader MPCC Corrector de Coma
Dates: May 3, 2014
Frames: 7×600″ ISO1600
Integration: 1.2 hours
Darks: ~15
Flats: ~20
Bias: ~150

Author: Jose Fco. Del Aguila
AstroPhotography of the day by SPONLI 08 May 2014

The Antares and Rho Ophiuchi Region

The Rho Ophiuchi cloud complex is a dark nebula of gas and dust that is located 1° south of the star ρ Ophiuchi of the constellation Ophiuchus. At an estimated distance of 131 ± 3 parsecs, this cloud is one of the closest star-forming regions to the Solar System.

The bright blue reflection nebula at the top, IC 4604, is associated with the triple star, Rho Ophiuchi.  Antares (Alpha Scorpii) is surrounded by a yellow area of nebulosity, IC 4606. Antares is 60,000 times brighter than our sun, and is so large that its disc can be easily measured – if it were in our solar system it would almost reach to Jupiter.

Nikon d7000
Nikkor 180mm F/2.8 @ f/4.0
85x30s at iso 2000
45x120s at iso 1250
10x240s at iso 1250
Dates: March 14, 2013

Autor: Jan Curtis

AstroPhotography of the day by SPONLI

31 January 2014

We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.

The Colorful Clouds of Rho Ophiuchi


Image Credit & Copyright: Rafael Defavari

The many spectacular colors of the Rho Ophiuchi (oh’-fee-yu-kee) clouds highlight the many processes that occur there. The blue regions shine primarily by reflected light. Blue light from the star Rho Ophiuchi and nearby stars reflects more efficiently off this portion of the nebula than red light. The Earth’s daytime sky appears blue for the same reason. The red and yellow regions shine primarily because of emission from the nebula’s atomic and molecular gas. Light from nearby blue stars – more energetic than the bright star Antares – knocks electrons away from the gas, which then shines when the electrons recombine with the gas. Thedark brown regions are caused by dust grains – born in young stellar atmospheres – which effectively block light emitted behind them. The Rho Ophiuchi star clouds, well in front of the globular cluster M4 visible above on lower left, are even more colorful than humans can see – the clouds emits light in every wavelength band from the radio to the gamma-ray.