Comet 22P/Kopff will make its closest approach to the Sun on 10 July, at a distance of 1.54 AU.
From Cambridge on the day of perihelion it will be visible in the evening sky, becoming accessible around 21:48 (EDT), 23° above your south-eastern horizon, as dusk fades to darkness. It will then reach its highest point in the sky at 23:40, 28° above your southern horizon. It will continue to be observable until around 01:44, when it sinks below 21° above your south-western horizon.
The events that comprise the 2009 apparition of 22P/Kopff are as follows:
| Date | Event |
| 10 Jul 2009 | Comet 22P/Kopff passes perihelion |
The table below lists the times when 22P/Kopff will be visible from Cambridge day-by-day through its apparition:
| Date | Constellation | Comet visibility |
| 19 Jun 2009 | Serpens Cauda | Visible from 22:16 until 03:35 Highest at 00:56, 31° above S horizon |
| 21 Jun 2009 | Sagittarius | Visible from 22:09 until 03:27 Highest at 00:48, 31° above S horizon |
| 23 Jun 2009 | Sagittarius | Visible from 22:03 until 03:18 Highest at 00:40, 31° above S horizon |
| 25 Jun 2009 | Sagittarius | Visible from 21:54 until 03:08 Highest at 00:32, 31° above S horizon |
| 27 Jun 2009 | Sagittarius | Visible from 21:54 until 02:59 Highest at 00:25, 30° above S horizon |
| 29 Jun 2009 | Sagittarius | Visible from 21:53 until 02:50 Highest at 00:17, 30° above S horizon |
| 01 Jul 2009 | Sagittarius | Visible from 21:53 until 02:40 Highest at 00:10, 30° above S horizon |
| 03 Jul 2009 | Sagittarius | Visible from 21:52 until 02:30 Highest at 00:02, 30° above S horizon |
| 05 Jul 2009 | Sagittarius | Visible from 21:51 until 02:16 Highest at 23:51, 29° above S horizon |
| 07 Jul 2009 | Sagittarius | Visible from 21:50 until 02:07 Highest at 23:43, 29° above S horizon |
| 09 Jul 2009 | Sagittarius | Visible from 21:49 until 01:57 Highest at 23:36, 29° above S horizon |
| 11 Jul 2009 | Sagittarius | Visible from 21:47 until 01:46 Highest at 23:29, 28° above S horizon |
| 13 Jul 2009 | Sagittarius | Visible from 21:45 until 01:36 Highest at 23:22, 28° above S horizon |
| 15 Jul 2009 | Sagittarius | Visible from 21:44 until 01:26 Highest at 23:15, 28° above S horizon |
| 17 Jul 2009 | Sagittarius | Visible from 21:42 until 01:16 Highest at 23:08, 27° above S horizon |
| 19 Jul 2009 | Sagittarius | Visible from 21:39 until 01:06 Highest at 23:01, 27° above S horizon |
| 21 Jul 2009 | Sagittarius | Visible from 21:37 until 00:55 Highest at 22:54, 27° above S horizon |
| 23 Jul 2009 | Sagittarius | Visible from 21:35 until 00:45 Highest at 22:48, 26° above S horizon |
| 25 Jul 2009 | Sagittarius | Visible from 21:32 until 00:35 Highest at 22:42, 26° above S horizon |
| 27 Jul 2009 | Sagittarius | Visible from 21:29 until 00:24 Highest at 22:35, 26° above S horizon |
| 29 Jul 2009 | Sagittarius | Visible from 21:27 until 00:14 Highest at 22:29, 26° above S horizon |
A more detailed table of 22P/Kopff's position on each night is available here. A diagram of the orbit of 22P/Kopff is available here.
Finder chart
The chart below shows the path of 22P/Kopff 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 22P/Kopff is currently available.
The comet's position at perihelion will be:
| Object | Right Ascension | Declination | Constellation | Magnitude |
| Comet 22P/Kopff | 18h12m20s | 19°16'S | Sagittarius | 7.3 |
The coordinates are given in J2000.0.
The sky on 26 Sep 2024
| The sky on 26 September 2024 | ||||||||||||||||||||||||||||||||||
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23% 23 days old |
All times shown in EDT.
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Source
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 16 Sep 2024.
Image credit
© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.