Messier 71 is a globular cluster located in constellation Sagitta. The cluster is located approximately 12 – 13 thousand light-years from earth. The classification of M71 as a globular cluster was questionable for a long time, because it lacks central star concentration and therefore it was considered as an open cluster. The diameter of this cluster is only 27 light-years, which is very low value for globular cluster.
Well I am back in light pollute sub-urban area. I can use bigger and heavier telescope, but I am missing dark skies of Milos. The picture is an integration of 38 pictures, with exposure time 3 minutes. Total exposure time was approximately 2 hours.
I managed to test new TS-Optics 2″ 3-element MaxField Newtonian Coma Corrector, which should be 2” version of Wynne corrector. It should have significant advantage compared all 2” coma correctors on the market: it reduces focal length by 5%, should correct full frame CCD (we will see about that) and it should have very low vignetting. I will have to extend my World Wide Coma Correction exercise.
Technical details:
Telescope | Newton 254/1000 mm |
Aperture | 254 mm |
Focal length | 950 mm |
Mount | Gemini G53f |
Autoguiding | ZWO 174MM, TS 60/240 mm |
Camera | ZWO 071 Pro @-15C |
Corrector | TS-Optics 2" 3-element MaxField |
Filters | Hutech IDAS LPS-D2 |
Exposure | 38x180s, Gain 94, bin 1x1, |
Date | 2018-10-04 |