12,548 days ago
Dominic Ford, Editor
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Comet 73P/Schwassmann-Wachmann is forecast to reach the brightest point in its 1990 apparition on 17 July. At that time, it will lie at a distance of 0.95 AU from the Sun, and at a distance of 0.17 AU from the Earth.
From Fairfield on 17 July it will not be readily observable since it will lie so far south that it will never rise more than 14° above the horizon.
The events that comprise the 1990 apparition of 73P/Schwassmann-Wachmann are as follows:
| Date | Event |
| 02 Jul 1990 | Comet 73P/Schwassmann-Wachmann passes perihelion |
| 17 Jul 1990 | Comet 73P/Schwassmann-Wachmann reaches peak brightness |
| 24 Jul 1990 | Comet 73P/Schwassmann-Wachmann passes perigee |
The table below lists the times when 73P/Schwassmann-Wachmann will be visible from Fairfield day-by-day through its apparition:
| Date | Constellation | Comet visibility |
| 26 Jun 1990 | Sextans | Not observable |
| 28 Jun 1990 | Sextans | Not observable |
| 30 Jun 1990 | Sextans | Not observable |
| 02 Jul 1990 | Sextans | Not observable |
| 04 Jul 1990 | Sextans | Not observable |
| 06 Jul 1990 | Sextans | Not observable |
| 08 Jul 1990 | Hydra | Not observable |
| 10 Jul 1990 | Hydra | Not observable |
| 12 Jul 1990 | Hydra | Not observable |
| 14 Jul 1990 | Hydra | Not observable |
| 16 Jul 1990 | Antlia | Not observable |
| 18 Jul 1990 | Antlia | Not observable |
| 20 Jul 1990 | Antlia | Not observable |
| 22 Jul 1990 | Vela | Not observable |
| 24 Jul 1990 | Vela | Not observable |
| 26 Jul 1990 | Vela | Not observable |
| 28 Jul 1990 | Carina | Not observable |
| 30 Jul 1990 | Carina | Not observable |
| 01 Aug 1990 | Volans | Not observable |
| 03 Aug 1990 | Dorado | Not observable |
| 05 Aug 1990 | Dorado | Not observable |
A more detailed table of 73P/Schwassmann-Wachmann's position on each night is available here. A diagram of the orbit of 73P/Schwassmann-Wachmann is available here.
Finder chart
The chart below shows the path of 73P/Schwassmann-Wachmann 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 73P/Schwassmann-Wachmann is currently available.
The comet's position on 17 July 1990 will be:
| Object | Right Ascension | Declination | Constellation | Magnitude |
| Comet 73P/Schwassmann-Wachmann | 09h31m10s | 34°12'S | Antlia | 6.6 |
The coordinates are given in J2000.0.
The sky on 23 Nov 2024
| The sky on 23 November 2024 | ||||||||||||||||||||||||||||||||||
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36% 22 days old |
All times shown in EST.
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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 23 Nov 2024.
Image credit
© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.