JPL c/2020 A1, has the most complete orbital elements data vanbuitenen , twitter the person who updates solar system small bodies data to CdC ( Cartes du Ciel) for CdC, you can add manually by: Setup>Solar System>Comet>Load MPC file>Or use a local file>COMx.DAT which contains following: CK21A010 2022 01 3.3079 0.614994 1.000050 225.0905 255.8741 132.6859 20210115 8.5 4.0 C/2021 A1 (Leonard) MPEC 2021-A99 or from JPL Horizons, manually input as follows: minorplanetcenter MPEC id: 2021-A99 waa dot at aerith This comet will be initially visible from the Northern Hemisphere, and will become visible from the Southern Hemisphere in December 2021 and January 2022. Will Comet Leonard be visible to the unaided eye? It’s possible. This might be this year’s brightest comet (unless a new brighter one is discovered). It will provide a nice spectacle to observers using long exposure cameras, binocular...