Tag: Scorpius

Rho Ophiuchi region

Rho Ophiuchi is in my opinion the most beautiful assembly of the nebulae in the universe. Blue, red, and orange colors are combined to create this magnificent cloud complex. The dominant yellow star Antares (Alpha Scorpii) is a red supergiant, one of the largest visible stars. The star Alniyat (Sigma Scorpii) is surrounded by ionized hydrogen gas. Between these two stars is the M4 globular cluster, which I captured on Fuerteventura. The blue nebula is Rho Ophiuchi, also captured by me earlier.

In order to capture the whole beauty, one has to use a relatively short focal length (I used 180 mm), combined with a large sensor area (I used full frame 36×24 mm), and take the shots at a very dark location. This was my primary target during our trip to Crete 2021 and I am very happy that I finally got it framed. However, there is another beautiful nebula called Blue Horsehead in the visual vicinity and if I would turn the camera 90°, I would manage to capture it. So, there is a target for my next expedition.

Technical details:

LensAskar FMA180 F4.5
CameraCanon EOS 6Da
MountiOptron Skyguider Pro
Exposure38x120s, ISO 1600
Date2021-07-07

M4 Globular cluster

Messier 4 (left side of the picture) is a globular cluster located in constellation Scorpius, close to the brightest star of this constellation Antares (right side). This cluster is the closest one to the Solar System, due to its “short” distance 7200 light-years and it contains several tens of thousands of stars. There is another globular cluster on the bottom side of the picture NGC 6144. The star Antares is classified as a red supergiant, with diameter several times bigger than the Sun, which makes it one of the largest know stars. it is only 550 light-years away, which means M4 and Antares are close only visually, but in reality, there is a very long distance between them.
If any brighter star is photographed by the Newtonian telescope, the diffraction cross appears due to the so-called “spider vanes” holder of the secondary mirror. If the spider vanes are not perpendicular to each other (like in my case), the diffraction pattern makes multiple ugly lines. This means I will have to correct it, as soon as I get back from Fuerteventura.

Technical details:

TelescopeNewton 150/600 mm
Aperture150 mm
Focal length570 mm
MountRainbow Astro RST 135
AutoguidingZWO 174MM, Guidescope 30 mm
CameraZWO 071 Pro @-0°C
CorrectorTS MaxField
FiltersNo
Exposure44x180s, Gain 94, bin 1x1,
Date2020-07-23

NGC6357 Lobster Nebula

Lobster Nebula is a HII region (giant cloud of excited hydrogen gas) located in constellation Scorpius. The nebula rises only 8° above the horizon in Central Europe, which means, it is submerged in light pollution caused by nearby towns, villages or cities. The situation is completely different on Canary Islands, where the nebula rises 27° above the horizon. Therefore, this nebula was my primary target of my expedition to Fuerteventura. Unfortunately, the weather didn’t cooperated and strong winds caused bad seeing and didn’t allow me to capture more frames. So, next time it will be better.

Technical details:

TelescopeNewton 150/600 mm
Aperture150 mm
Focal length570 mm
MountRainbow Astro RST 135
AutoguidingZWO 174MM, Guidescope 30 mm
CameraZWO 071 Pro @-0°C
CorrectorTS MaxField
FiltersNo
Exposure40x180s, Gain 94, bin 1x1,
Date2020-07-22

M7 Ptolemy cluster

Messier 7, sometimes called Ptolemy cluster, is an open cluster located in between constellations Sagittarius and Scorpius. The cluster is visually located on the galactic plane of the Milky Way, therefore there are many stars in the background. The cluster is badly visible from Central Europe. Much better opportunities to observe or photograph this cluster have astronomers or astrophotographers in southern countries. My last attempt to capture it in Greece was constantly disturbed by the weather, therefore we I was again in South, specifically at Fuerteventura, I didn’t hesitate and recapture this beautiful cluster.

Technical details:

TelescopeNewton 150/600 mm
Aperture150 mm
Focal length570 mm
MountRainbow Astro RST 135
AutoguidingZWO 174MM, Guidescope 30 mm
CameraZWO 071 Pro @-0°C
CorrectorTS MaxField
FiltersNo
Exposure64x180s, Gain 94, bin 1x1,
Date2020-07-21

M80 Globular Cluster

Messier80 is a globular cluster located in the constellation Scorpius. M80 is approximately 28’400 light-years far from Earth and it has several hundred thousand stars. M80 belongs to one the densest globular cluster and it’s characterized by frequent star collisions in the center.

Technical details:

TelescopeNewton 150/600 mm
Aperture150 mm
Focal length660 mm
MountiOptron CEM25P
AutoguidingQHYCCD miniGuideScope 130 mm f/4.3, ZWO 174 MM
CameraZWO 071 Pro @-10C
CorrectorExplore Scientific HR coma corrector
FiltersAstronomik L-1 - UV IR Block Filter
Exposure20x120s, Gain 134, bin 1x1,
Date2018-09-06