Water Production Rate of C/2020 F3 (NEOWISE) from SOHO/SWAN over Its Active Apparition

C/2020 F3 (NEOWISE) was discovered in images from the Near Earth Object program of Wide-Field Infrared Survey Explorer taken on 2020 March 27 and has become Great Comet 2020. The Solar Wind ANisotropies (SWAN) camera Heliospheric Observatory (SOHO) spacecraft, located a halo orbit around Earth–Sun L1 Lagrange point, makes daily full-sky hydrogen Ly?. Water production rates were determined SWAN Ly? brightness spatial distribution comet measured over 4 month period time either side comet's perihelion July 3. water rate s?1 moderately asymmetric varied with heliocentric distance, r, au as (6.9 ± 0.5) × 1028 r?2.5±0.2 (10.1 r?3.5±0.1 before after perihelion, respectively. This is consistent having been through planetary region solar system one or more previous apparitions. large 5.27 1030 shortly once outside avoidance area SWAN, when 0.324 Sun.