This table lists the interval when comets are expected to be brighter than 13 - 14th magnitude and gives the period of visibility from the UK.
Comet Max From (elsewhere) From (UK) To (UK) To (elsewhere) Notes 2009 P1 (Garradd) 7 2011 January 2011 June 2012 June 2012 October 2012 December 2006 S3 (LONEOS) 12 2011 March 2011 June 2011 August 2012 May 2012 June 2013 July 48P/Johnson 12 2011 April 2012 January Southern hemisphere 78P/Gehrels 11 2011 May 2011 July 2012 March 2012 July 45P/Honda-Mrkos-Pajdus 6 2011 July 2011 September 2011 October 2011 November 2006 T1 (P/Levy) ? 2011 December 2012 February 2012 May 73P/Schwassmann-Wachma Vb 2011 September 2011 November 49P/Arend-Rigaux 14 2011 October 2011 December 21P/Giacobini-Zinner 11 2011 October 2012 May Poor elongation 29P/Schwassmann-Wachma Vb 2011 December 2012 August 185P/Petriew 11 2012 May 2012 July 2012 September 2012 November 96P/Machholz 2 2012 June 2012 August Poor elongation 1994 X1 (P/McNaught-Ru 11 2012 August 2013 February 2013 March 2011 F1 (LINEAR) 10 2012 July 2012 September Southern Hemisphere 2013 February 2013 November Southern Hemisphere 2011 L4 (PanSTARRS) 13 2012 August 2012 October Southern Hemisphere 1 2013 January 2013 March Southern Hemisphere 1 2013 March 2013 September 26P/Grigg-Skjellerup 14 2013 June 2013 July Southern Hemisphere 29P/Schwassmann-Wachma Vb 2012 December 2013 September 102P/Shoemaker 13 2013 June 2013 July 2013 December 154P/Brewington 10 2013 June 2013 August 2014 April 2P/Encke 6 2013 August 2013 November 2014 February Poor elongation post P/2004 CB 11 2014 P/2000 G1 10 2016 45P/Honda-Mrkos-Pjdus 6 2017 41P/Tuttle-Giacobini- 7 2018 46P/Wirtanen 3 2018 August 2019 May P/Pons-Brooks 4 2023 November 2024 April 1P/Halley 10 2060 October 2061 March 1 2061 July 2061 August 109P/Swift-Tuttle 1 2126 January 2126 August