Rank 83 documents SOHO — the Solar and Heliospheric Observatory, a joint ESA/NASA spacecraft stationed at Sun–Earth L1 that revolutionized heliophysics with continuous corona monitoring and became history's most prolific comet discoverer. Launched 2 December 1995 aboard Atlas IIAS, SOHO reached its L1 halo orbit in February 1996 — 1.5 million kilometres sunward of Earth — where twelve instruments including EIT, LASCO, and MDI observe the Sun's atmosphere, surface oscillations, and solar wind. Roger Bonnet and Joseph Gurman's science teams weathered a near-loss in 1998 when gyro failure required creative recovery; the observatory continues operating after twenty-five-plus years. Citizen scientists combing LASCO images have discovered more than four thousand comets. Wallimilist renders SOHO with gold cylindrical body, coronagraph disk, corona streamers, L1 orbit callout, and navy SOHO title exactly as the master PNG dictates — Atlas IIAS line, italic L1 kicker, and curator copy on heliophysics heritage and comet discoveries.