A view on this supernova remnant that exploded in the year 1054, the supernova was visible during 23 days in daylight, and became 4 times brighter than Venus.
Image combination from Grandpré and Meldert, 79×60″ on Gain 100, Esprit120 F7,5 ASI2600MC
Messier 1 full view 75% reduced
One of the most impressive galaxies in Ursa Major, M101 is well-known to most observers, and can already be detected with binoculars.
This picture was taken under the dark skies of Grandpré, La Talma, in Northern France. SQM Values varied during the three capture nights between 21,20 and 21,40.
With the large Dobsonian telescopes (16″ to 20″) many details also visible in this picture could be detected.
In full 100% view (the original sensor resolution), many many small galaxies van be seen in the background. Most of the weakest ones are 20th to 21th magnitude.
Click on the image for a larger view!
The old photometer Stars209 unfortunately died, after the cover window was blown off by the wind. Meanwhile a new meter was obtained Stars 551.
Link to the data
I’m working to get the data nicely represented.
The data from Stars209 were recorded from February 2019 till December 2020, almost non-stop. The CSV download file can be found here: