© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.

19P/Borrelly at perigee

Dominic Ford, Editor
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Comet 19P/Borrelly will make its closest approach to the Earth, at a distance of 0.38 AU.

From Ashburn the 2028–2029 apparition of 19P/Borrelly will progress as follows:

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05 Dec 2028 – 19P/Borrelly at perigee
06 Dec 2028 – 19P/Borrelly reaches its brightest
08 Dec 2028 – 19P/Borrelly at perihelion
14 Nov 2028FornaxVisible from 22:16 until 02:12
Highest at 00:14, 25° above S horizon
16 Nov 2028EridanusVisible from 21:49 until 02:19
Highest at 00:04, 27° above S horizon
18 Nov 2028EridanusVisible from 21:15 until 02:17
Highest at 23:46, 29° above S horizon
20 Nov 2028EridanusVisible from 20:49 until 02:22
Highest at 23:35, 31° above S horizon
22 Nov 2028EridanusVisible from 20:24 until 02:26
Highest at 23:25, 33° above S horizon
24 Nov 2028EridanusVisible from 20:00 until 02:29
Highest at 23:15, 35° above S horizon
26 Nov 2028EridanusVisible from 19:37 until 02:32
Highest at 23:04, 38° above S horizon
28 Nov 2028EridanusVisible from 19:14 until 02:35
Highest at 22:54, 41° above S horizon
30 Nov 2028EridanusVisible from 18:48 until 02:33
Highest at 22:40, 43° above S horizon
02 Dec 2028EridanusVisible from 18:26 until 02:35
Highest at 22:31, 46° above S horizon
04 Dec 2028EridanusVisible from 18:06 until 02:37
Highest at 22:21, 49° above S horizon
06 Dec 2028CetusVisible from 17:59 until 02:38
Highest at 22:12, 52° above S horizon
08 Dec 2028CetusVisible from 17:56 until 02:36
Highest at 21:59, 55° above S horizon
10 Dec 2028CetusVisible from 17:58 until 02:37
Highest at 21:51, 58° above S horizon
12 Dec 2028CetusVisible from 17:59 until 02:34
Highest at 21:39, 61° above S horizon
14 Dec 2028AriesVisible from 17:57 until 02:36
Highest at 21:32, 64° above S horizon
16 Dec 2028AriesVisible from 17:59 until 02:33
Highest at 21:21, 67° above S horizon
18 Dec 2028AriesVisible from 18:00 until 02:31
Highest at 21:11, 69° above S horizon
20 Dec 2028AriesVisible from 18:02 until 02:32
Highest at 21:05, 72° above S horizon
22 Dec 2028AriesVisible from 18:00 until 02:30
Highest at 20:56, 75° above S horizon
24 Dec 2028AriesVisible from 18:02 until 02:28
Highest at 20:47, 77° above S horizon

A more detailed table of 19P/Borrelly's position on each night is available here. A diagram of the orbit of 19P/Borrelly is available here.

Finder chart

The chart below shows the path of 19P/Borrelly 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 19P/Borrelly is currently available.

The comet's position at perihelion will be:

Object Right Ascension Declination Constellation Magnitude
Comet 19P/Borrelly 03h00m00s 2°37'S Eridanus 6.3

The coordinates are given in J2000.0.

The sky on 05 December 2028
Twilight ends
Twilight begins

19-day old moon
Waning Gibbous


19 days old

Rise Culm. Set
Mercury 08:01 12:36 17:10
Venus 05:03 10:14 15:24
Moon 19:20 02:52 10:16
Mars 00:27 06:46 13:05
Jupiter 02:52 08:33 14:13
Saturn 14:45 21:23 04:01
All times shown in EST.


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 15 Mar 2021.

Image credit

© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.






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