The comet 21P/Giacobini-Zinner
From Ashburn (click to change), 21P/Giacobini-Zinner is visible in the dawn sky, rising at 00:49 (EDT) – 6 hours and 6 minutes before the Sun – and reach an altitude of 55° above the south-eastern horizon before fading from view as dawn breaks at around 05:51.
Object Type Comet
|Right Ascension:||06h30m |
|Semi-major axis:||3.50 AU|
|Longitude ascending node:||195.39°|
|Argument of perihelion:||172.86°|
|Epoch of elements:||21 September 2018|
|Mean Anomaly at epoch:||1.77°|
|Orbital period:||6.54 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 31 July 2005. 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.