Click for 100% view - Klicken für 100%-Ansicht
100%-Ausschnitt aus obigem Bild / 100% Crop from above image
-move mouse over image to get background galaxy descriptors-
Messier 57, the ring nebula, is a planetary nebula in 2300lyrs distance. The central star - a white dwarf - has a surface temperature of about 70000K and a
visual magnitude of about 15m8. Taking into account a visual diameter of 120arcsecs gives us an absolute object diameter of 1.3lyrs.
The nebula is about 20000yrs old and expands with appx. 19km/sec.
The galaxy located next to M57 is IC1296, which is about 221Mlyrs deep in space. In the 100% crop below a few additional PGC background galaxies are
marked when moving the mouse above the image.
Datum/Date:
18.06.2013 / June, 18th2013
Optik / Scope:
7,5” Maksutov Newtonian Astrograph f/5.3 with 2” 1:10 Crayford focusser
Sensor/CCD:
QHY10 CCD-Camera (APS-C) @ -15°C
Autoguiding:
ALccd5 @ ED 80/600 Apochromat
Belichtung/Exposure:
27x500sec, total integration time = 3h45mins
Software:
Regim, Fitswork,Photoshop CS6
The Universe at a glance...
Juniper Hill Observatory
Köfering, Bavaria
12° 12’ E
48°56’ N
344m N.N.
NGC6720 (Messier 057) / Ring nebula
