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

48P/Johnson reaches its brightest

Dominic Ford, Editor
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Comet 48P/Johnson is forecast to reach its brightest, at around mag 11.5. It will lie at a distance of 2.01 AU from the Sun, and at a distance of 1.02 AU from the Earth.

From Cambridge, it will be visible between 00:53 and 02:30. It will become accessible at around 00:53, when it rises 21° above your southern horizon, and then reach its highest point in the sky at 01:41, 22° above your southern horizon. It will become inaccessible at around 02:30 when it sinks to 22° above your southern horizon.

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 48P/Johnson.

This event was automatically generated on the basis of orbital elements published by the Minor Planet Center (MPC), and is updated daily (last update, 24 Mar 2019).

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 48P/Johnson will be:

Object Right Ascension Declination Constellation Magnitude
Comet 48P/Johnson 22h39m30s -24°42' Aquarius 11.5

The coordinates are given in J2000.0.

The sky on 17 August 2018
Twilight ends
Twilight begins

6-day old moon
Waxing Crescent


6 days old

Rise Culm. Set
Mercury 04:55 11:52 18:49
Venus 09:53 15:36 21:18
Moon 12:59 18:15 23:31
Mars 18:53 23:08 03:28
Jupiter 12:46 17:51 22:56
Saturn 16:36 21:10 01:48
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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