© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.

21P/Giacobini-Zinner at perihelion

Dominic Ford, Editor
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Comet 21P/Giacobini-Zinner will make its closest approach to the Sun, at a distance of 1.01 AU.

From Ashburn, it will be visible in the dawn sky, rising at 23:32 (EST) – 7 hours and 16 minutes before the Sun – and reach an altitude of 64° above the eastern horizon before fading from view as dawn breaks at around 05:43.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

For more information about its path across the sky, see In-The-Sky.org's ephemeris page for comet 21P/Giacobini-Zinner.

This event was automatically generated on the basis of orbital elements published by the Minor Planet Center (MPC), and is updated daily (last update, 20 Nov 2018).

Note that the future positions of comets are typically known with a high degree of confidence, but their brightnesses are often much more unpredictable, since it is impossible to predict with certainty how they will respond as they move closer to the Sun. Magnitude estimates should be assumed to be highly provisional more than a few weeks in advance.

Printable finder charts

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Dark-on-light PNG image PDF document

The exact position of comet 21P/Giacobini-Zinner will be:

Object Right Ascension Declination Constellation Magnitude
Comet 21P/Giacobini-Zinner 05h52m00s +32°18' Auriga 7.4

The coordinates are given in J2000.0.

The sky on 10 September 2018
Twilight ends
Twilight begins

1-day old moon
Waxing Crescent


1 day old

Rise Culm. Set
Mercury 05:57 12:33 19:09
Venus 10:29 15:38 20:48
Moon 07:48 14:02 20:16
Mars 17:28 22:02 02:38
Jupiter 11:47 16:55 22:02
Saturn 15:16 20:00 00:47
All times shown in EDT.


The circumstances of this event were computed using the DE405 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).

This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.

Image credit

© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.




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