| C/2019 Y1 | |
| Discoverer: | Asteroid Terrestrial-impact Last Alert System (ATLAS) |
| Epoch: | 15 March 2020 (JD 2458924.06) |
| Observation Arc: | 187 days |
| Obs: | 993 |
| Aphelion: | AU |
| Perihelion: | 0.837824 AU |
| Semimajor: | AU |
| Eccentricity: | 0.996510 |
| Period: | yr |
| Inclination: | 73.34814° |
| Asc Node: | 31.366322° |
| Arg Peri: | 57.49823° |
| Jupiter Moid: | 1.02611 AU |
| Last P: | 2020-Mar-15 |
C/2019 Y1 (ATLAS) is a comet with a near-parabolic orbit discovered by the ATLAS survey on 16 December 2019. It passed perihelion on 15 March 2020 at 0.84 AU from the Sun.[1] Its orbit is very similar to C/1988 A1 (Liller), C/1996 Q1 (Tabur), C/2015 F3 (SWAN) and C/2023 V5 (Leonard), suggesting they may be fragments of a larger ancient comet.
The comet passed close to Earth in early May 2020. It was visible in the northern hemisphere sky in the spring of 2020.