Comet ATLAS (C/2020 M3) is approaching Earth. At closest approach on Nov. 14th it will be 0.358 AU (54 million km) away--not quite near enough to make it a naked-eye object. Amateur astronomers with small telescopes will find it to be an easy target glowing like a 7th or 8th magnitude star. The comet's green atmosphere is huge. It is nearly as wide as a full Moon. Hence the following tip for astrophotographers: You'll need a wide field to capture the entire comet. It gets its verdant hue from diatomic carbon (C2), a compound which glows green in the near vacuum of space. On the date of closest approach, Comet ATLAS will be in the constellation Orion. Comet C/2020 S3 (Erasmus) is currently in the constellation of Sextans. At closest approach on Nov. 18th it will be 1.04 AU (155 million km) away from Earth. Erasmus will not be a naked-eye object but it is expected to reach 8th magnitude at that time. Amateur astronomers with small telescopes will be able to catch the comet. The current estimated magnitude of Comet C/2020 S3 (Erasmus) is 9.5 (COBS). On the date of closest approach, Comet Erasmus will be in the constellation Corvus. Stay Tuned!