The comet 73P/Schwassmann-Wachmann
From Ashburn (click to change), 73P/Schwassmann-Wachmann will become visible at around 18:20 (EST) as the dusk sky fades, 57° above your southern horizon. It will then sink towards the horizon, setting 7 hours and 20 minutes after the Sun at 00:31.
Object Type Comet
|Brightness (V):||Mag 18.8|
|Semi-major axis:||3.09 AU|
|Longitude ascending node:||69.66°|
|Argument of perihelion:||199.40°|
|Epoch of elements:||17 January 2018|
|Mean Anomaly at epoch:||55.67°|
|Orbital period:||5.44 years|
|Light-on-dark||PNG image||PDF document|
|Dark-on-light||PNG image||PDF document|
Magnitudes estimates are derived from observations sent into the BAA Comet Section, as compiled by Jonathan Shanklin and last updated on 4 April 2017. We use these amateur observations in preference to the MPC's magnitude estimates, since they are updated much more often. Nonetheless, all comets are intrinsically unpredictable objects, and future magnitude estimates must always be taken with a pinch of salt.