The comet 21P/Giacobini-Zinner

Finder chart
Please wait
Loading 0/4
Click and drag to rotate
Mouse wheel to zoom in/out
Touch with mouse to dismiss
Click and drag the chart above to pan around the sky, or use the mouse wheel to zoom. Click to enlarge.

From Ashburn , 21P/Giacobini-Zinner is visible in the evening sky, becoming accessible around 20:37 (EDT) as the dusk sky fades, 30° above your south-eastern horizon. It will then reach its highest point in the sky at 22:49, 39° above your southern horizon. It will continue to be observable until around 02:09, when it sinks below 22° above your south-western horizon.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.
Name 21P/Giacobini-Zinner
Object Type Comet
Current Position
Magnitude:22.26 (V) [2]
Absolute mag (H):9.40 [2]
Slope parameter (n):5.84 [2]
Right ascension:10h14m [1]
Declination:-11°31' [1]
Distance:3.91 AU
32.56 lightmin [1]
Orbital Elements [1]
Semi-major axis:3.50 AU
Longitude ascending node:195.37°
Argument of perihelion:172.85°
Epoch of elements:30 March 2020
Mean Anomaly at epoch:85.44°
Derived quantities
Perihelion:1.01 AU
Aphelion:5.98 AU
Orbital period:6.54 years
Additional sources

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.




Color scheme