14,374 days ago
Dominic Ford, Editor
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Comet 45P/Honda-Mrkos-Pajdusakova will make its closest approach to the Earth on 12 December, at a distance of of 0.40 AU.
From Cambridge on the day of perigee it will not be readily observable since it will be very close to the Sun, at a separation of only 14° from it.
The events that comprise the 1984–1985 apparition of 45P/Honda-Mrkos-Pajdusakova are as follows:
| Date | Event |
| 30 Nov 1984 | Comet 45P/Honda-Mrkos-Pajdusakova passes perihelion |
| 12 Dec 1984 | Comet 45P/Honda-Mrkos-Pajdusakova passes perigee |
The table below lists the times when 45P/Honda-Mrkos-Pajdusakova will be visible from Cambridge day-by-day through its apparition:
| Date | Constellation | Comet visibility |
| 21 Nov 1984 | Sagittarius | Not observable |
| 23 Nov 1984 | Sagittarius | Not observable |
| 25 Nov 1984 | Sagittarius | Not observable |
| 27 Nov 1984 | Sagittarius | Not observable |
| 29 Nov 1984 | Ophiuchus | Not observable |
| 01 Dec 1984 | Ophiuchus | Not observable |
| 03 Dec 1984 | Ophiuchus | Not observable |
| 05 Dec 1984 | Ophiuchus | Not observable |
| 07 Dec 1984 | Ophiuchus | Not observable |
| 09 Dec 1984 | Ophiuchus | Not observable |
| 11 Dec 1984 | Scorpius | Not observable |
| 13 Dec 1984 | Libra | Not observable |
| 15 Dec 1984 | Libra | Not observable |
| 17 Dec 1984 | Libra | Not observable |
| 19 Dec 1984 | Libra | Not observable |
| 21 Dec 1984 | Libra | Not observable |
| 23 Dec 1984 | Libra | Not observable |
| 25 Dec 1984 | Libra | Visible from 05:38 until 05:58 Highest at 05:58, 25° above SE horizon |
| 27 Dec 1984 | Libra | Visible from 05:19 until 05:59 Highest at 05:59, 27° above SE horizon |
| 29 Dec 1984 | Libra | Visible from 05:02 until 06:00 Highest at 06:00, 29° above SE horizon |
| 31 Dec 1984 | Libra | Visible from 04:46 until 06:00 Highest at 06:00, 31° above SE horizon |
A more detailed table of 45P/Honda-Mrkos-Pajdusakova's position on each night is available here. A diagram of the orbit of 45P/Honda-Mrkos-Pajdusakova is available here.
Finder chart
The chart below shows the path of 45P/Honda-Mrkos-Pajdusakova 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 45P/Honda-Mrkos-Pajdusakova is currently available.
The comet's position at perigee will be:
| Object | Right Ascension | Declination | Constellation | Magnitude |
| Comet 45P/Honda-Mrkos-Pajdusakova | 16h17m50s | 21°03'S | Scorpius | 6.4 |
The coordinates are given in J2000.0.
The sky on 20 Apr 2024
| The sky on 20 April 2024 | ||||||||||||||||||||||||||||||||||
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91% 12 days old |
All times shown in EDT.
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Warning
Never attempt to point a pair of binoculars or a telescope at an object close to the Sun. Doing so may result in immediate and permanent blindness.
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 02 Jan 2024.
Image credit
© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.