Nova Cas 2021

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Nova Cas 2021

V1405 Cas • Classical nova • Cassiopeia • 5500 light-years from Earth

🗓️
March 2021

Nova Cassiopeiae 2021 in the night sky

Overview

Nova Cassiopeiae 2021 was discovered just two days before this image was captured. The outburst occurred around 5500 light years from Earth and involved a white dwarf star drawing material from a nearby companion. As gas built up on the white dwarf’s surface, rising temperature and pressure triggered a thermonuclear explosion, causing the system to brighten dramatically. The sudden increase in light seen here marks the moment that eruption became visible from Earth.

Background

The night sky may seem eternal and never-changing, but ask any Ancient Greek and they’d tell you that’s not the case. In March 2021 a nova star was detected, and word quickly spread around the astronomical community. It was fairly bright, especially so soon after being detected, so well within the limits of my telescope and camera. The weather was fairly grotty but there was a short enough break in the clouds to quickly gather some subs. It took a bit of work and staring at star charts to actually identify the nova within the initial wide field of view — check out the example data below and you’ll see what I mean!

Framed astrophoto taken from a light-polluted city, available to buy as a fine art print

Imaging details

Total exposure
30 minutes
Dates captured
20 March 2021
Location and sky
Bristol, UK (Bortle 8)

Equipment and software

Telescope
Askar FRA400
Camera
ZWO ASI 2600MC Pro
Mount
Orion Sirius EQ-G
Guiding
WO 32mm + ZWO ASI 120MM Mini
Control
ASIAIR
Software
PixInsight, Lightroom
Image by
Lee Pullen

Exposure by filter

No filter

Channels
RGB
Subframes
15 × 2 minutes
Integration
30 minutes
View subframe and stack

Single subframe and integrated stack, both with a simple stretch applied.

Single subframe
Single subframe2 minutes
Integrated stack
Integrated stack30 minutes

Kit list

This is the equipment I used to capture the image.
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Guidescope: William Optics 32mm Slide-Base Uniguide
Read my review
Buy from Astroshop.eu
Buy from High Point Scientific

Example astrophotography image promoting one-to-one online astrophotography masterclasses

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