Medulla nebula – CTB 1 – Abell 85

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This is a supernova remnant in the constellation Cassiopeia. Basic astronomical data on the object is sparse to find, but recent information indicates a distance of approximately 6500 ly and an age of about 10 000 years. The size is approximately 1/100 of the distance. However, data are rather uncertain. It has been suggested in the litterature that this suprenova remnant is special in the way that the remaining neutron star was forcefully kicked away by the supernova explosion and is now moving away from the nebula at very high speed. Normally, a supernova explosion leaves a neutron star/pulsar in the center of the remnant nebula. The object is rather large in angular size (0.6 deg), but quite faint and requires long exposure times.

This image is the result of a collaborative project between several Swedish astrophotographers sharing data from different types of equipment. This image is processed by me from a total of 43 hours of data acquired by me (Skywatcher 150/750 PDS – Risingcam ATR3CMOS26000KPA) , Stefan Nilsson (TS-Optics 115/800 – ZWO ASI2600MC) and Magnus Tagesson (Skywatcher 150/750 PDS – ZWO ASI2600MC Pro).The data was gathered during December 2022.

This type of collaborative project is very rewarding and appears to be the only way to acquire the long exposure times that are needed for this type of object, given the current lack of clear skies in our part of the world. Thanks to my collaborators.

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