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URGENT: Saturn polar storm

2018-03-31

Maciel Bassani Sparrengerger has imaged a bright spot on Saturn CM on March 29 at 08:16:05 UT that has later been confirmed by several observers.

http://alpo-j.asahikawa-med.ac.jp/kk18/s180329z.htm

Updated ephemeris of this feature based on images from 29 March to 22 April are given below as calculated by Marc Delcroix. Urgent observations are required at all longitudes to follow the storm evolution, and search for other possible spots.

WinJUPOS 10.3.9 (Saturn), C.M. transit times, 2018/04/22  00:32
Object longitude: L3 = 181,8° - 11,7054°/d * (T - 2018 Apr 10,5)
Time interval: 2018 Mar 25,0 ... 2018 Jun 01,0
Output format: Date UT (C.M. of System 3)
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2018 Mar 29   08:16 ( 324°)   18:46 ( 319°)
2018 Mar 30   05:16 ( 314°)   15:46 ( 308°)
2018 Mar 31   02:17 ( 304°)   12:47 ( 299°)   23:17 ( 293°)
2018 Apr 01   09:47 ( 288°)   20:18 ( 283°)
2018 Apr 02   06:48 ( 278°)   17:18 ( 273°)
2018 Apr 03   03:48 ( 268°)   14:19 ( 263°)
2018 Apr 04   00:49 ( 258°)   11:19 ( 252°)   21:49 ( 247°)
2018 Apr 05   08:19 ( 242°)   18:50 ( 237°)
2018 Apr 06   05:20 ( 232°)   15:50 ( 227°)
2018 Apr 07   02:20 ( 221°)   12:51 ( 217°)   23:21 ( 211°)
2018 Apr 08   09:51 ( 206°)   20:21 ( 201°)
2018 Apr 09   06:52 ( 196°)   17:22 ( 191°)
2018 Apr 10   03:52 ( 186°)   14:22 ( 181°)
2018 Apr 11   00:52 ( 175°)   11:23 ( 171°)   21:53 ( 165°)
2018 Apr 12   08:23 ( 160°)   18:53 ( 155°)
2018 Apr 13   05:24 ( 150°)   15:54 ( 145°)
2018 Apr 14   02:24 ( 140°)   12:54 ( 134°)   23:24 ( 129°)
2018 Apr 15   09:55 ( 124°)   20:25 ( 119°)
2018 Apr 16   06:55 ( 114°)   17:25 ( 109°)
2018 Apr 17   03:56 ( 104°)   14:26 (  99°)
2018 Apr 18   00:56 (  94°)   11:26 (  88°)   21:56 (  83°)
2018 Apr 19   08:27 (  78°)   18:57 (  73°)
2018 Apr 20   05:27 (  68°)   15:57 (  63°)
2018 Apr 21   02:27 (  57°)   12:58 (  53°)   23:28 (  48°)
2018 Apr 22   09:58 (  42°)   20:28 (  37°)
2018 Apr 23   06:59 (  32°)   17:29 (  27°)
2018 Apr 24   03:59 (  22°)   14:29 (  17°)
2018 Apr 25   00:59 (  11°)   11:30 (   7°)   22:00 (   1°)
2018 Apr 26   08:30 ( 356°)   19:00 ( 351°)
2018 Apr 27   05:30 ( 346°)   16:01 ( 341°)
2018 Apr 28   02:31 ( 336°)   13:01 ( 331°)   23:31 ( 325°)
2018 Apr 29   10:01 ( 320°)   20:32 ( 315°)
2018 Apr 30   07:02 ( 310°)   17:32 ( 305°)
2018 May 01   04:02 ( 300°)   14:33 ( 295°)
2018 May 02   01:03 ( 290°)   11:33 ( 285°)   22:03 ( 279°)
2018 May 03   08:33 ( 274°)   19:04 ( 269°)
2018 May 04   05:34 ( 264°)   16:04 ( 259°)
2018 May 05   02:34 ( 254°)   13:04 ( 248°)   23:35 ( 244°)
2018 May 06   10:05 ( 239°)   20:35 ( 233°)
2018 May 07   07:05 ( 228°)   17:35 ( 223°)
2018 May 08   04:06 ( 218°)   14:36 ( 213°)
2018 May 09   01:06 ( 208°)   11:36 ( 202°)   22:06 ( 197°)
2018 May 10   08:37 ( 193°)   19:07 ( 187°)
2018 May 11   05:37 ( 182°)   16:07 ( 177°)
2018 May 12   02:37 ( 172°)   13:08 ( 167°)   23:38 ( 162°)
2018 May 13   10:08 ( 156°)   20:38 ( 151°)
2018 May 14   07:08 ( 146°)   17:39 ( 141°)
2018 May 15   04:09 ( 136°)   14:39 ( 131°)
2018 May 16   01:09 ( 126°)   11:39 ( 120°)   22:10 ( 116°)
2018 May 17   08:40 ( 110°)   19:10 ( 105°)
2018 May 18   05:40 ( 100°)   16:10 (  95°)
2018 May 19   02:41 (  90°)   13:11 (  85°)   23:41 (  80°)
2018 May 20   10:11 (  74°)   20:41 (  69°)
2018 May 21   07:11 (  64°)   17:42 (  59°)
2018 May 22   04:12 (  54°)   14:42 (  49°)
2018 May 23   01:12 (  44°)   11:42 (  38°)   22:13 (  34°)
2018 May 24   08:43 (  28°)   19:13 (  23°)
2018 May 25   05:43 (  18°)   16:13 (  13°)
2018 May 26   02:44 (   8°)   13:14 (   3°)   23:44 ( 358°)
2018 May 27   10:14 ( 352°)   20:44 ( 347°)
2018 May 28   07:15 ( 342°)   17:45 ( 337°)
2018 May 29   04:15 ( 332°)   14:45 ( 327°)
2018 May 30   01:15 ( 322°)   11:46 ( 317°)   22:16 ( 312°)
2018 May 31   08:46 ( 306°)   19:16 ( 301°)
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