Supernova 2019ein a type 1a is located in the lenticular galaxy NGC5353 in the galaxy cluster of Hickson 68. Imaged the night of May 14, 2019.
Annotated image follows.
Messier 1 is a supernova remnant located in Taurus. In 1054, Chinese astronomers recorded a bright new star that faded away over time. For awhile it was the 2nd brightest object in the night sky after the Moon shining at a magnitude of -7. Venus on occasions will only make it to around -4,8 magnitude. Independently discovered by Charles Messier while looking for Halley's Comet, it gave him the ideal to record non-moving objects that could be mistaken for comets. It is also called the Crab Nebula because of a drawing William Parsons made that he thought it resembled a crab.
At the heart of the nebula is a pulsar, which is the remains of the progenitor star that collapsed down to a neutron star. The highly magnetized star is spinning around 30 times a second that creates the pulses of radiation. The progenitor star was thought to be between 9 and 11 solar masses, the existing star is around 1.4 to 2 solar masses and is compressed down to a size less that 30 kilometers across.
Messier 77 is an active galaxy located in the constellation of Cetus (The Sea Monster). It has an active galactic nucleus and is classified as a type 2 Seyfert galaxy. It is one of the closest of this type of galaxy.
The first supernova detected in this galaxy was discovered on November 24, 2018 by the DLT40 Survey and was given the name of SN2018ivc. It is classified as a type II supernova which is a core collapse of a massive star.
Supernova 2017eaw, discovered on May 14, 2017 by Patrick Wiggins in the aptly named "FireWorks Galaxy", NGC 6946. With 10 supernovas in the last century, it has been quite active in producing supernovas. Months later, near the end of August, the supernova is still quite bright. Revisited it on the nights of August 18-21 to capture this image of it with the RC10 and the Atik 314l+ camera.
NGC 3631 is a face on spiral galaxy located in the constellation of Ursa Major. Located some 50 million light years away, on March 13, Ron Arbour discovered a supernova in this galaxy. Currently around magnitude 15, it is easily visible in the galaxy. It was determined that this was a type 1b supernova, which is a massive star that underwent a core collapse. These are often Wolf-Rayet stars that have blown off most of their outer layers of hydrogen.
Imaged with the ED80CFT refractor, and Atik 314L+ mono ccd, it consists of 9 x 300 second images through R/G/B filters, and 39 x 300 second luminance images.
My attempt at NGC 3184, a spiral galaxy located in the constellation of Ursa Major, and home to a recently discovered supernova SN 2016bkv by Koichi Itagaki on March 21, 2016. Currently at magnitude 15, and located at a distance of 25-55 million light years away for the galaxy, we are seeing an event that happened long ago.
Taken with an ED80CFT 80 mm refractor with an Atik 314l+ mono ccd. Exposures of 300 seconds through L/R/G/B filters.