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

Comet 10P/Tempel passes perihelion

Dominic Ford, Editor
From the Comets feed

Objects: 10P/Tempel
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Comet 10P/Tempel will make its closest approach to the Sun on 2 August, at a distance of 1.42 AU.

From Cambridge on the day of perihelion it will be visible between 01:07 and 02:38. It will become accessible at around 01:07, when it rises to an altitude of 21° above your southern horizon. It will reach its highest point in the sky at 01:53, 22° above your southern horizon. It will become inaccessible at around 02:38 when it sinks below 21° above your southern horizon.

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The events that comprise the 2026 apparition of 10P/Tempel are as follows:

Date Event
02 Aug 2026Comet 10P/Tempel reaches peak brightness
02 Aug 2026Comet 10P/Tempel passes perihelion
03 Aug 2026Comet 10P/Tempel passes perigee

The table below lists the times when 10P/Tempel will be visible from Cambridge day-by-day through its apparition:

Date Constellation Comet visibility
12 Jul 2026CapricornusVisible from 00:10 until 03:50
Highest at 02:46, 32° above S horizon
14 Jul 2026CapricornusVisible from 00:10 until 03:52
Highest at 02:42, 31° above S horizon
16 Jul 2026CapricornusVisible from 00:10 until 03:54
Highest at 02:37, 30° above S horizon
18 Jul 2026CapricornusVisible from 00:11 until 03:57
Highest at 02:32, 29° above S horizon
20 Jul 2026CapricornusVisible from 00:13 until 03:59
Highest at 02:27, 28° above S horizon
22 Jul 2026CapricornusVisible from 00:15 until 04:01
Highest at 02:22, 28° above S horizon
24 Jul 2026CapricornusVisible from 00:18 until 04:04
Highest at 02:17, 27° above S horizon
26 Jul 2026CapricornusVisible from 00:22 until 04:02
Highest at 02:12, 26° above S horizon
28 Jul 2026CapricornusVisible from 00:26 until 03:46
Highest at 02:06, 25° above S horizon
30 Jul 2026CapricornusVisible from 00:33 until 03:30
Highest at 02:01, 24° above S horizon
01 Aug 2026CapricornusVisible from 00:41 until 03:11
Highest at 01:56, 23° above S horizon
03 Aug 2026Piscis AustrinusVisible from 00:52 until 02:49
Highest at 01:50, 22° above S horizon
05 Aug 2026Piscis AustrinusVisible from 01:11 until 02:19
Highest at 01:45, 21° above S horizon
07 Aug 2026Piscis AustrinusNot observable
09 Aug 2026Piscis AustrinusNot observable
11 Aug 2026Piscis AustrinusNot observable
13 Aug 2026Piscis AustrinusNot observable
15 Aug 2026Piscis AustrinusNot observable
17 Aug 2026Piscis AustrinusNot observable
19 Aug 2026Piscis AustrinusNot observable
21 Aug 2026Piscis AustrinusNot observable

A more detailed table of 10P/Tempel's position on each night is available here. A diagram of the orbit of 10P/Tempel is available here.

Finder chart

The chart below shows the path of 10P/Tempel 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.

Based on the magnitude parameters published for this comet by the BAA Comet Section, we estimate that it may be around mag 7 on 2 August 2026. This estimate is based on observations that the BAA has received from amateur astronomers, assuming that its current level of activity will remain constant.

This comet is not expected to be visible to the naked eye, but might be visible through bird-watching binoculars.

The comet's position at perihelion will be:

Object Right Ascension Declination Constellation Magnitude
Comet 10P/Tempel 21h51m50s 24°49'S Capricornus 7.4

The coordinates are given in J2000.0.

The sky on 2 Aug 2026

The sky on 2 August 2026
Sunrise
05:34
Sunset
20:02
Twilight ends
21:57
Twilight begins
03:39

19-day old moon
Waning Gibbous

79%

19 days old

Planets
Rise Culm. Set
Mercury 04:05 11:27 18:49
Venus 09:32 15:41 21:50
Moon 21:33 03:29 09:37
Mars 01:56 09:32 17:09
Jupiter 05:20 12:37 19:53
Saturn 22:42 04:57 11:12
All times shown in EDT.

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 13 Oct 2024.

Image credit

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

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