The Rho Ophiuchi Nebula – Antares

is a multiple star system in the constellation Ophiuchus. The central system has an apparent magnitude of 4.63. Based on the central system’s parallax of 9.03 mas, it is located about 360 light-years (110 parsecs) away. The other stars in the system are slightly farther away. Rho Ophiuchi is the namesake of the Rho Ophiuchi cloud complex. It is a nebula of gas and dust, which the Rho Ophiuchi system is embedded in. It is one of the easiest star forming regions to observe, as it is one of the nearest, and it is visible from both hemispheres.

The interstellar extinction of Rho Ophiuchi is measured to be 1.45 magnitudes, meaning the dust and gas in front of Rho Ophiuchi absorbs light from the system, making it appear 1.45 magnitudes dimmer than it should be. Additionally, gas and dust also scatters more higher-frequency light, leaving the light appearing more reddish. The interstellar reddening of Rho Ophiuchi has been measured to be 0.47 magnitudes.

Rho Ophiuchi Nebula - Antares

This is my first processing with material collected in two different sessions, with different exposure parameters. It was a bit of work with it but I have a new skill now 😉

Source: https://en.wikipedia.org/wiki/Rho_Ophiuchi

Photos (June 2019) taken at Tenerife, exactly in the place next to “God’s finger”. A great place for astrophotography during night.

Equipment: Canon EOS 6D (no mod!) with a Canon EF 200 [mm] 2.8L II USM lens, on a damaged iOptron CEM 25 mount.

  • Composition: Astro Pixel Processor,
  • Processing: GIMP v2.10.12 + plug-ins (Linux),
  • Lights: 19 x 130[s] ISO 640 + 48 x 60[x] ISO 800,
  • Flats: 40 ISO-640 + 40 ISO-800,
  • Darks: 10 ISO-640 + 19 IS-800,
  • Bias: 20 ISO-640 + 20 ISO-800

NGC 6541 & M25

NGC 6541 (GCL 86 or ESO 280-SC4) – is a globular cluster in the southern constellation of Corona Australis. It is estimated to be around 14 billion years old. 6.3 [mag]. Distance from Sun 24,5 tly.

NGC 6541, M25 - Zoom

M25 (IC4725) – is an open cluster of stars in the southern constellation of Sagittarius. The cluster is located near some obscuring features, with a dark lane passing near the center. M25 is at a distance of about 2,000 light-years light-years away from Earth and is 67.6 million years old. The spatial dimension of this cluster is about 13 light-years across.

Photos (June 2019) taken at Tenerife, exactly in the place next to “God’s finger”. A great place for astrophotography during night and long conversations about the nature of time, speed of light, wondering if life exists in other planetary systems…

NGC6541-M25_v1-zoom.png

Equipment: Canon EOS 6D (no mod) with a Canon EF 200 [mm] 2.8L II USM lens, on a glued iOptron CEM 25 mount, which I accidentally earlier crashed on beton.

  • Composition: Astro Pixel Processor,
  • Processing: GIMP v2.10.14 + plug-ins (Linux),
  • Lights: 10 x 90[s] ISO 1000,
  • Flats: 40 ISO-1000,
  • Darks: 17 ISO-1000,
  • Bias: 20 ISO-1000