Comet SWAN 273P/Pons–Gambart C/2006 M4 (SWAN) C/2009 F6 (Yi–SWAN) C/2012 E2 (SWAN) C/2015 F3 (SWAN) C/2015 F5 (SWAN-XingMing) C/2020 F8 (SWAN) C/2025 F2 (SWAN) C/2025 R2 (SWAN) Kreutz sungrazer SWAN (instrument) Solar and Heliospheric Observatory