A comparative study of the blue comets C/1908 R1 (Morehouse) and C/2016 R2 (Pan-STARRS) S. E. Anderson, P. Rousselot, E. Jehin, B. Noyelles, J. Manfroid, P. Hardy and V. Robert A&A, 692 (2024) A1 Published online: 28 November 2024 DOI: 10.1051/0004-6361/202450636