A supernova was discovered in galaxy M82 during mid-January 2014. It was discovered by Steve Fossey of University College London.

On 31st January the supernova stopped brightening at a peak magnitude of 10.5, it is the closest Type 1a supernova to be discovered in the past 40 years.
Designated as SN 2014J is a type 1a supernova which occurs in a binary system (2 stars orbiting each other) one of the stars is a white dwarf. A white dwarf is the remnant of a star that has completed its normal life cycle and has ceased nuclear fusion. White dwarfs are however capable of further fusion reactions that release a lot of enbergy as long as their temperatures rises high enough.

This is where the companion star of the white dwarfs plays an important role.
When this white dwarf accumulates matter from its companion star it rises the temperature of the core of the star and at a specific point the white dwarf ignites and nuclear fusion (carbon fusion) starts again.

Within a few seconds of starting the nuclear fusion, a substantial fraction of the matter in the white dwarf undergoes a runaway reaction, releasing enough energy to unbind the star in a huge supernova explosion.

The typical visual absolute magnitude of a Type 1a supernova is about times brighter than our own Sun. This also allows us to see it over a distance (in the case of M82) of over 12 million light years.

Previous/older images:

Image data

Object info
Name SN2014J (in M82)
Type Supernova (type 1a)
Constellation Ursa Major
Right ascension 09h 55m 42s
Declination +69° 40′ 27″
Distance 12 Mly
Other designations
Image info
Image date Feb. 02, 2014
Light frames 5x 4 min. RGBG (each), 20x 5 min. 7nm Ha unbinned (Luminance)
Total integration 2h 40m
Dark frames 29x
Flat frames 20x p. filter unbinned
Bias frames 20x
Software used CCDOps, CCDSoft, Maxim DL, Photoshop CS4
Processing CCDOPS was used for focussing. Image Acquisition was done using CCDSoft.
All separate frames were calibrated, aligned and stacked in MaxIm DL5 Pro.
Photoshop CS4 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction)
Equipment info
Telescope Orion Optics SPX 10″ Newton
Corrector Televue 2″ Paracorr coma corrector (FL: 1.380mm f/5.43)
Mount Losmandy G-11 Gemini
Camera SBIG ST-8300M
Guide camera Astrolumina ALccd5-II (Mono)
Guide scope Celestron 60/700 Achromat
Autoguide software PHD2 Guiding
Filters Baader 2″ 7nm Ha, Baader 2″ RGB + IDAS LPS-P2
Location Landgraaf, The Netherlands
Image comments

All exposures were taken through IDAS LPS-2 filter which was in front of the filter wheel.
CCD Temp was set at -15.