1,617 days ago
Dominic Ford, Editor
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Comet C/2019 U6 (Lemmon) will make its closest approach to the Sun on 18 June, at a distance of 0.91 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 8° below the horizon at dusk.
The events that comprise the 2020 apparition of C/2019 U6 (Lemmon) are as follows:
| Date | Event |
| 18 Jun 2020 | Comet C/2019 U6 (Lemmon) passes perihelion |
| 22 Jun 2020 | Comet C/2019 U6 (Lemmon) reaches peak brightness |
| 28 Jun 2020 | Comet C/2019 U6 (Lemmon) passes perigee |
The table below lists the times when C/2019 U6 (Lemmon) will be visible from Cambridge day-by-day through its apparition:
| Date | Constellation | Comet visibility |
| 28 May 2020 | Canis Major | Not observable |
| 30 May 2020 | Canis Major | Not observable |
| 01 Jun 2020 | Canis Major | Not observable |
| 03 Jun 2020 | Canis Major | Not observable |
| 05 Jun 2020 | Puppis | Not observable |
| 07 Jun 2020 | Puppis | Not observable |
| 09 Jun 2020 | Puppis | Not observable |
| 11 Jun 2020 | Puppis | Not observable |
| 13 Jun 2020 | Puppis | Not observable |
| 15 Jun 2020 | Hydra | Not observable |
| 17 Jun 2020 | Hydra | Not observable |
| 19 Jun 2020 | Hydra | Not observable |
| 21 Jun 2020 | Hydra | Not observable |
| 23 Jun 2020 | Hydra | Not observable |
| 25 Jun 2020 | Sextans | Not observable |
| 27 Jun 2020 | Sextans | Not observable |
| 29 Jun 2020 | Sextans | Not observable |
| 01 Jul 2020 | Sextans | Not observable |
| 03 Jul 2020 | Sextans | Not observable |
| 05 Jul 2020 | Leo | Not observable |
| 07 Jul 2020 | Leo | Not observable |
A more detailed table of C/2019 U6 (Lemmon)'s position on each night is available here. A diagram of the orbit of C/2019 U6 (Lemmon) is available here.
Finder chart
The chart below shows the path of C/2019 U6 (Lemmon) 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 C/2019 U6 (Lemmon) is currently available.
The comet's position at perihelion will be:
| Object | Right Ascension | Declination | Constellation | Magnitude |
| Comet C/2019 U6 (Lemmon) | 08h54m20s | 11°32'S | Hydra | 6.5 |
The coordinates are given in J2000.0.
The sky on 18 Jun 2020
| The sky on 18 June 2020 | ||||||||||||||||||||||||||||||||||
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4% 27 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 20 Nov 2024.
Image credit
© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.