Jupiter's Great

Redspot

Revised 8/25/2008

Jupiter's Great Redspot, an atmospheric cyclone, is one of the best known features of our Solar System. It is believed that a spot observed by Hooke as early as 1664 may have been the GRS, making it one of the longest lived features ever observed. During the years of 1879-1882, the spot became such a striking red, it earned its present name.

The GRS currently appears as a colorless oval hollow. Jupiter rotates differentially, with its equatoral region rotating faster than its more temporate zones. The equatorial region rotates in 9 hours 50 minutes (System I), while the temporate latitudes that include the GRS rotate in 9 hours 55 minutes (System II).

An observer would think that the GRS would be visible during half of the period of rotation, but in reality, due to foreshortening effects when near the limb, it is actually only visible for about a 100 minute interval (50 minutes before to 50 minutes after the times listed below).

 

Red Spot at CM Longitude 127° (System II)

September 2008 (Times are EDT)
1 08:25;18:21;
2 04:17;14:12;
3 00:08;10:04;20:00;
4 05:55;15:51;
5 01:47;11:42;21:38;
6 07:34;17:30;
7 03:25;13:21;23:17;
8 09:12;19:08;
9 05:04;15:00;
10 00:55;10:51;20:47;
11 06:43;16:38;
12 02:34;12:30;22:25;
13 08:21;18:17;
14 04:13;14:08;
15 00:04;10:00;19:56;
16 05:51;15:47;
17 01:43;11:39;21:34;
18 07:30;17:26;
19 03:22;13:17;23:13;
20 09:09;19:05;
21 05:00;14:56;
22 00:52;10:48;20:43;
23 06:39;16:35;
24 02:31;12:26;22:22;
25 08:18;18:14;
26 04:10;14:05;
27 00:01;09:57;19:53;
28 05:48;15:44;
29 01:40;11:36;21:31;
30 07:27;17:23;

October 2008 (Times are EDT)
1 03:19;13:15;23:10;
2 09:06;19:02;
3 04:58;14:53;
4 00:49;10:45;20:41;
5 06:37;16:32;
6 02:28;12:24;22:20;
7 08:16;18:11;
8 04:07;14:03;23:59;
9 09:55;19:50;
10 05:46;15:42;
11 01:38;11:34;21:29;
12 07:25;17:21;
13 03:17;13:12;23:08;
14 09:04;19:00;
15 04:56;14:51;
16 00:47;10:43;20:39;
17 06:35;16:31;
18 02:27;12:22;22:18;
19 08:14;18:10;
20 04:06;14:01;23:57;
21 09:53;19:49;
22 05:45;15:40;
23 01:36;11:32;21:28;
24 07:24;17:19;
25 03:15;13:11;23:07;
26 09:03;18:58;
27 04:54;14:50;
28 00:46;10:42;20:37;
29 06:34;16:29;
30 02:25;12:21;22:17;
31 08:13;18:08;

November 2008 (Times are EDT)
1 04:04;14:00;23:56;
2 09:52;19:47;
3 05:43;15:39;
4 01:35;11:31;21:27;
5 07:23;17:18;
6 03:14;13:10;23:06;
7 09:02;18:57;
8 04:54;14:49;
9 00:45;10:41;20:37;
10 06:33;16:28;
11 02:24;12:20;22:16;
12 08:12;18:08;
13 04:04;13:59;23:55;
14 09:51;19:47;
15 05:43;15:38;
16 01:35;11:30;21:26;
17 07:22;17:18;
18 03:14;13:09;23:05;
19 09:01;18:57;
20 04:53;14:49;
21 00:45;10:40;20:36;
22 06:32;16:28;
23 02:24;12:20;22:15;
24 08:11;18:07;
25 04:03;13:59;23:54;
26 09:51;19:46;
27 05:42;15:38;
28 01:34;11:30;21:25;
29 07:22;17:17;
30 03:13;13:09;23:05;

December 2008 (Times are EDT)
1 09:01;18:56;
2 04:53;14:48;
3 00:44;10:40;20:36;
4 06:32;16:27;
5 02:24;12:19;22:15;
6 08:11;18:07;
7 04:03;13:58;23:54;
8 09:50;19:46;
9 05:42;15:38;
10 01:34;11:29;21:25;
11 07:21;17:17;
12 03:13;13:09;23:04;
13 09:00;18:56;
14 04:52;14:48;
15 00:44;10:40;20:35;
16 06:31;16:27;
17 02:23;12:19;22:15;
18 08:11;18:06;
19 04:03;13:58;23:54;
20 09:50;19:46;
21 05:42;15:37;
22 01:34;11:29;21:25;
23 07:21;17:17;
24 03:13;13:08;23:04;
25 09:00;18:56;
26 04:52;14:48;
27 00:44;10:39;20:35;
28 06:31;16:27;
29 02:23;12:19;22:14;
30 08:10;18:06;
31 04:02;13:58;23:54;