SkyViking
18-05-2012, 09:25 PM
Hi All,
Yes, another globular image from me :)
This one was taken a while ago on 1st May, but I didn't have time to process it until now. It also proved to be rather challenging because there was a bit of glare from a 55% illuminated Moon, combined with the large amounts of faint dust in the Antares region. The background is not completely flat but I believe the remaining irregularities are mostly due to the dust clouds.
Hi-res image available here (1.2MB): http://www.pbase.com/rolfolsen/image/123575176/original
Image details:
10" Serrurier truss Newtonian f/5
QSI 683wsg
LRGB 45:21:21:21
Messier 4 is the nearest globular cluster, being 2.2kpc or about 7,175 light years away. It is very prominent with the slightest optical aid, and is located just 1.3 degrees west of Antares in Scorpius. Messier 4 would be one of the most splendid globulars in the sky if it were not obscured by heavy clouds of dark interstellar matter. Interstellar absorption also reddens the color of the light from the cluster. However, it displays an angular diameter of more than that of the Full Moon, which corresponds to a actual diameter of 75 light years.
It is also one of the least concentrated globular clusters. The central core is much less dense than in many other globulars, such as 47 Tucanae.
BTW, I also created a Colour-Magnitude diagram for this globular and added it to my collection here: http://www.pbase.com/rolfolsen/colourmagnitude_diagrams
Hope you enjoy the view. Comments and critique is welcome as usual.
Regards,
Rolf
Yes, another globular image from me :)
This one was taken a while ago on 1st May, but I didn't have time to process it until now. It also proved to be rather challenging because there was a bit of glare from a 55% illuminated Moon, combined with the large amounts of faint dust in the Antares region. The background is not completely flat but I believe the remaining irregularities are mostly due to the dust clouds.
Hi-res image available here (1.2MB): http://www.pbase.com/rolfolsen/image/123575176/original
Image details:
10" Serrurier truss Newtonian f/5
QSI 683wsg
LRGB 45:21:21:21
Messier 4 is the nearest globular cluster, being 2.2kpc or about 7,175 light years away. It is very prominent with the slightest optical aid, and is located just 1.3 degrees west of Antares in Scorpius. Messier 4 would be one of the most splendid globulars in the sky if it were not obscured by heavy clouds of dark interstellar matter. Interstellar absorption also reddens the color of the light from the cluster. However, it displays an angular diameter of more than that of the Full Moon, which corresponds to a actual diameter of 75 light years.
It is also one of the least concentrated globular clusters. The central core is much less dense than in many other globulars, such as 47 Tucanae.
BTW, I also created a Colour-Magnitude diagram for this globular and added it to my collection here: http://www.pbase.com/rolfolsen/colourmagnitude_diagrams
Hope you enjoy the view. Comments and critique is welcome as usual.
Regards,
Rolf