Nova Cassiopeia | Bea Budai & Zsolt Paragi

Nova Cassiopeia | Bea Budai & Zsolt Paragi
Nova Cassiopeia | Bea Budai & Zsolt Paragi
Nova Cassiopeia (V1405 Cas)

This picture shows the recently discovered nova in the Cassiopeia constellation – V1405 Cas is the bright orange star just below and left of the center. The image combines data from three observing nights (taken during the curfew, in Hoogeveen, the Netherlands).

Two shooting sessions used a narrow-band filter that highlights both the red emission from the Hydrogen-alpha and the blue emission from Oxygen (OIII) lines – these dominate emission-line nebulae like the Bubble Nebula seen in the right-hand side of the image. One night used a broad-band light pollution filter, to capture the natural colors of the stars. The nova appeared in a beautiful part of the Milky Way, dominated by the Bubble Nebula, the M52 open cluster (to the left), and a number of bright stars.

Novae occur when a white dwarf star has accreted too much gas from its companion star, and this results in a runaway thermonuclear reaction on its surface.
Bea Budai and Zsolt Paragi (Cities and Skies)
V1405 Cas, Bubble Nebula, M52 - 4.8 h
Hoogeveen, Netherlands
30 March 2021 (20x180s), 16 April 2021 (30x300s) Optolong L-eXtreme
14 April 2021 (26x180s) Optolong L-Pro
William Optics GT81, f/5.9
Flattener 6AIII 0.8x
ZWO ASI533MC-P, gain 240 (narrow-band)/101 (broadband), -20 deg.
WO Uniguide 50/200 with ASI120MMmini
iOptron CEM40
Bortle~5 (our region; in the town, it should be worse)
Astro Pixel Processor, Photoshop.