C/2014 Q2 Lovejoy is a long-period comet discovered on 17 August 2014 by amateur astronomer and astrophotographer Terry Lovejoy.
The comet's blue-green glow is the result of diatomic carbon and water molecules.
Originating in the Oort Cloud, it has an orbital period of around 19,000 years.
It passed closest to the Sun on 30 January 2015 at a distance of 193,000,000 km.
Below is a selection of images of comet C/2014 Q2 Lovejoy captured by astrophotographers and BBC Sky at Night Magazine readers.
For advice on astro imaging, read our beginner's guide to astrophotography, and don't forget to send us your images or share them with us via Facebook, Twitter and Instagram.
Comet Lovejoy from Australia by André van der Hoeven, Siding Springs, Australia. Equipment: FSQ106, SBIG STL-11000C
C/2014 Q2 (Lovejoy) by Slawomir, Australia. Equipment: 0.43-m f/6.8 astrograph, FLI Proline 16803
Byrhtnoth Points the Way to Lovejoy by Simon Patient, Maldon, Essex, UK. Equipment: Canon 1D mkiii, EF24-70mm f2.8L USM.
Comet Lovejoy by Stephen Gill, Lincolnshire, UK. Equipment: 4" f/6 Refractor, modified Canon 600d, UHC filter
Comet Lovejoy by Alfredo José Martins Balreira, Rio Tinto, Portugal. Equipment: EQ-6 mount, Skywatcher 80ED, Canon EOS Rebel T3.
Comet C/2014 Q2 (Lovejoy) by Bill McSorley, Leeds, UK. Equipment: SW150P, HEQ5 Pro Mount, QHY8L cooled ccd.
Comet C/2014 Q2 Lovejoy by Stephen Charnock, Farndon, Newark, Notts, UK. Equipment: Orion Atlas EQ-G mount, 10" Orion Astrograph, modded Canon 30D.
Comet Lovejoy 2014 by Jaspal Chadha, London, UK. Equipment: Skywatcher Espirt 100ED, QSI 690CCD.
Comet Lovejoy by Alastair Woodward, Derby, UK. Equipment: Skywatcher 6" Newtonian, HEQ5 mount, IR Modded Canon 100d, CLS clip filter.
Comet Lovejoy by Alastair Woodward, Derby, UK. Equipment: Skywatcher 6" Newtonian, HEQ5 mount, IR Modded Canon 100d, CLS clip filter.
Comet Lovejoy by John Short, Whitburn, Tyne and Wear, UK. Equipment: Altair 85mm triplet, Canon 70D.
Comet Lovejoy 2014 by Jaspal Chadha, London, UK. Equipment: Skywatcher Espirt 100ED, QSI 690CCD
The anti-tail of comet C/2014 Q2 Lovejoy by José J. Chambó Bris, Hoya Redonda, Spain. Equipment: GSO 8" @ f/3.8 reflector, Canon EOS-100D camera
Comet Lovejoy by Mike Joy, Wales, UK. Equipment: Skywatcher 200 PDS, EQ5 Pro,h Canon 70D