Comet 1P/Halley will make its closest approach to the Sun on 5 March, at a distance of 0.59 AU.
From Cambridge on the day of perihelion it will not be observable – it will reach its highest point in the sky during daytime and will be no higher than 2° above the horizon at dawn.
The events that comprise the 1986 apparition of 1P/Halley are as follows:
| Date | Event |
| 05 Mar 1986 | Comet 1P/Halley passes perihelion |
| 09 Mar 1986 | Comet 1P/Halley reaches peak brightness |
| 23 Apr 1986 | Comet 1P/Halley passes perigee |
The table below lists the times when 1P/Halley will be visible from Cambridge day-by-day through its apparition:
| Date | Constellation | Comet visibility |
| 12 Feb 1986 | Aquarius | Visible from 17:32 until 18:03 Highest at 17:32, 14° above W horizon |
| 14 Feb 1986 | Aquarius | Visible from 17:34 until 17:51 Highest at 17:34, 11° above W horizon |
| 16 Feb 1986 | Aquarius | Visible from 17:37 until 17:39 Highest at 17:37, 8° above W horizon |
| 18 Feb 1986 | Aquarius | Not observable |
| 20 Feb 1986 | Aquarius | Not observable |
| 22 Feb 1986 | Aquarius | Not observable |
| 24 Feb 1986 | Aquarius | Not observable |
| 26 Feb 1986 | Aquarius | Not observable |
| 28 Feb 1986 | Aquarius | Not observable |
| 02 Mar 1986 | Aquarius | Not observable |
| 04 Mar 1986 | Aquarius | Not observable |
| 06 Mar 1986 | Aquarius | Not observable |
| 08 Mar 1986 | Aquarius | Visible from 05:44 until 05:51 Highest at 05:51, 9° above E horizon |
| 10 Mar 1986 | Aquarius | Visible from 05:35 until 05:47 Highest at 05:47, 10° above E horizon |
| 12 Mar 1986 | Aquarius | Visible from 05:26 until 05:44 Highest at 05:44, 11° above E horizon |
| 14 Mar 1986 | Aquarius | Visible from 05:17 until 05:40 Highest at 05:40, 12° above E horizon |
| 16 Mar 1986 | Aquarius | Visible from 05:09 until 05:37 Highest at 05:37, 13° above SE horizon |
| 18 Mar 1986 | Aquarius | Visible from 05:01 until 05:33 Highest at 05:33, 14° above SE horizon |
| 20 Mar 1986 | Capricornus | Visible from 04:53 until 05:30 Highest at 05:30, 14° above SE horizon |
| 22 Mar 1986 | Capricornus | Visible from 04:45 until 05:26 Highest at 05:26, 15° above SE horizon |
| 24 Mar 1986 | Capricornus | Visible from 04:37 until 05:23 Highest at 05:23, 15° above SE horizon |
A more detailed table of 1P/Halley's position on each night is available here. A diagram of the orbit of 1P/Halley is available here.
Finder chart
The chart below shows the path of 1P/Halley 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 1P/Halley is currently available.
The comet's position at perihelion will be:
| Object | Right Ascension | Declination | Constellation | Magnitude |
| Comet 1P/Halley | 22h03m50s | 4°59'S | Aquarius | 1.4 |
The coordinates are given in J2000.0.
The sky on 17 Jul 2024
| The sky on 17 July 2024 | ||||||||||||||||||||||||||||||||||
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88% 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 05 Jul 2024.
Image credit
© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.