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

185P/Petriew at perihelion

Dominic Ford, Editor
From the Comets feed

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Comet 185P/Petriew will make its closest approach to the Sun, at a distance of 0.94 AU.

From Cambridge the 2023 apparition of 185P/Petriew will progress as follows:

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.
13 Jul 2023 – 185P/Petriew at perihelion
22 Jun 2023AriesNot observable
24 Jun 2023AriesNot observable
26 Jun 2023TaurusNot observable
28 Jun 2023TaurusNot observable
30 Jun 2023TaurusNot observable
02 Jul 2023TaurusNot observable
04 Jul 2023TaurusNot observable
06 Jul 2023TaurusNot observable
08 Jul 2023TaurusNot observable
10 Jul 2023TaurusNot observable
12 Jul 2023TaurusNot observable
14 Jul 2023TaurusNot observable
16 Jul 2023TaurusNot observable
18 Jul 2023TaurusNot observable
20 Jul 2023TaurusNot observable
22 Jul 2023TaurusNot observable
24 Jul 2023OrionNot observable
26 Jul 2023OrionNot observable
28 Jul 2023OrionNot observable
30 Jul 2023OrionNot observable
01 Aug 2023GeminiNot observable

A more detailed table of 185P/Petriew's position on each night is available here. A diagram of the orbit of 185P/Petriew is available here.

At the moment of perihelion it will not be observable – it will reach its highest point in the sky during daytime and will be no higher than 10° above the horizon at dawn.

Finder chart

The chart below shows the path of 185P/Petriew over the course of its apparition, as calculated from the orbital elements published by the Minor Planet Center (MPC). It is available for download, either on dark background, in PNG, PDF or SVG formats, or on a light background, in PNG, PDF or SVG formats. It was produced using StarCharter.

Comet brightnesses

Comets are intrinsically highly unpredictable objects, since their brightness depends on the scattering of sunlight from dust particles in the comet's coma and tail. This dust is continually streaming away from the comet's nucleus, and its density at any particular time is governed by the rate of sublimation of the ice in the comet's nucleus, as it is heated by the Sun's rays. It also depends on the amount of dust that is mixed in with that ice. This is very difficult to predict in advance, and can be highly variable even between successive apparitions of the same comet.

In consequence, while the future positions of comets are usually known with a high degree of confidence, their future brightnesses are not. For most comets, we do not publish any magnitude estimates at all. For the few comets where we do make estimates, we generally prefer the BAA's magnitude parameters to those published by the Minor Planet Center, since they are typically updated more often.

No estimate for the brightness of comet 185P/Petriew is currently available.

The comet's position at perihelion will be:

Object Right Ascension Declination Constellation Magnitude
Comet 185P/Petriew 04h55m50s 22°16'N Taurus 11.5

The coordinates are given in J2000.0.

The sky on 13 July 2023
Twilight ends
Twilight begins

25-day old moon
Waning Crescent


25 days old

Rise Culm. Set
Mercury 06:25 13:50 21:16
Venus 08:31 15:15 22:00
Moon 01:38 09:20 17:14
Mars 08:49 15:36 22:24
Jupiter 01:00 07:56 14:52
Saturn 22:35 03:58 09:22
All times shown in EDT.


This event was automatically generated on the basis of orbital elements published by the Minor Planet Center (MPC) , and is updated whenever new elements become available. It was last updated on 28 Apr 2021.

Image credit

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






Color scheme