Comet C/2017 O1 (ASASSN) will make its closest approach to the Earth, at a distance of 0.71 AU.
|14 Oct 2017||– C/2017 O1 (ASASSN) at perihelion|
|16 Oct 2017||– C/2017 O1 (ASASSN) reaches its brightest|
|17 Oct 2017||– C/2017 O1 (ASASSN) at perigee|
|26 Sep 2017||Taurus||Visible from 23:03 until 05:41|
Highest at 04:53, 80° above S horizon
|28 Sep 2017||Perseus||Visible from 22:50 until 05:43|
Highest at 04:48, 82° above S horizon
|30 Sep 2017||Perseus||Visible from 22:37 until 05:45|
Highest at 04:43, 84° above S horizon
|02 Oct 2017||Perseus||Visible from 22:24 until 05:47|
Highest at 04:38, 86° above S horizon
|04 Oct 2017||Perseus||Visible from 22:11 until 05:50|
Highest at 04:33, 89° above S horizon
|06 Oct 2017||Perseus||Visible from 21:57 until 05:52|
Highest at 04:27, 89° above N horizon
|08 Oct 2017||Perseus||Visible from 21:42 until 05:54|
Highest at 04:22, 87° above N horizon
|10 Oct 2017||Perseus||Visible from 21:26 until 05:56|
Highest at 04:17, 84° above N horizon
|12 Oct 2017||Perseus||Visible from 21:10 until 05:58|
Highest at 04:11, 82° above N horizon
|14 Oct 2017||Perseus||Visible from 20:53 until 06:00|
Highest at 04:06, 80° above N horizon
|16 Oct 2017||Camelopardalis||Visible from 20:35 until 06:02|
Highest at 04:00, 77° above N horizon
|18 Oct 2017||Camelopardalis||Visible from 20:15 until 06:04|
Highest at 03:55, 75° above N horizon
|20 Oct 2017||Camelopardalis||Visible from 19:54 until 06:06|
Highest at 03:49, 73° above N horizon
|22 Oct 2017||Camelopardalis||Visible from 19:08 until 06:09|
Highest at 03:43, 71° above N horizon
|24 Oct 2017||Camelopardalis||Visible from 19:06 until 06:11|
Highest at 03:37, 69° above N horizon
|26 Oct 2017||Camelopardalis||Visible from 19:03 until 06:13|
Highest at 03:31, 67° above N horizon
|28 Oct 2017||Camelopardalis||Visible from 19:01 until 06:15|
Highest at 03:24, 65° above N horizon
|30 Oct 2017||Camelopardalis||Visible from 18:58 until 06:17|
Highest at 03:18, 63° above N horizon
|01 Nov 2017||Camelopardalis||Visible from 18:56 until 06:19|
Highest at 03:11, 61° above N horizon
|03 Nov 2017||Camelopardalis||Visible from 18:54 until 06:21|
Highest at 03:04, 59° above N horizon
|05 Nov 2017||Camelopardalis||Visible from 17:52 until 05:23|
Highest at 01:56, 57° above N horizon
The chart below shows the path of C/2017 O1 (ASASSN) 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.
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/2017 O1 (ASASSN) is currently available.
The comet's position at perihelion will be:
|Comet C/2017 O1 (ASASSN)||04h47m20s||+54°14'||Camelopardalis||8.8|
The coordinates are given in J2000.0.
|The sky on 17 October 2017|
27 days old
All times shown in EDT.
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 18 Jul 2020.