The comet C/2018 EF9 (Lemmon)
From Ashburn (click to change), C/2018 EF9 (Lemmon) is very well placed – it is close enough to the north celestial pole that it is high above the horizon all night.
Name C/2018 EF9 (Lemmon)
Object Type Comet
|Right Ascension:||00h04m |
|Semi-major axis:||712.14 AU|
|Longitude ascending node:||172.58°|
|Argument of perihelion:||72.61°|
|Epoch of elements:||06 July 2018|
|Mean Anomaly at epoch:||0.00°|
|Orbital period:||19004.13 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 1 June 2018. 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.