The comet 21P/Giacobini-Zinner
From Fairfield , 21P/Giacobini-Zinner is visible in the dawn sky, rising at 01:49 (EST) and reaching an altitude of 31° above the south-eastern horizon before fading from view as dawn breaks around 05:35.
Object Type Comet
|Magnitude:||21.63 (V) |
|Absolute mag (H):||9.40 |
|Slope parameter (n):||5.84 |
|Right ascension:||10h57m |
36.90 lightmin 
|Semi-major axis:||3.50 AU|
|Longitude ascending node:||195.39°|
|Argument of perihelion:||172.85°|
|Epoch of elements:||14 May 2019|
|Mean Anomaly at epoch:||37.04°|
|Orbital period:||6.54 years|
Where possible, the brightnesses of comets are estimated from absolute magnitude values computed by the BAA Comet Section, based on the observations they receive. We prefer these to the Minor Planet Center's own magnitude estimates, since the latter are less often updated. Nonetheless, comets are intrinsically unpredictable objects, and magnitude estimates must always be taken with a pinch of salt.