2017-11-08
Updated on 2017-12-04
Amateur observations of an equatorial bright large cloud in Neptune since June-July and over October and November have allowed to folow different cloud systems over the planet. Equatorial features followed by amateur astronomers in this period includ the close interaction of two equatorial clouds in November 6-10 and what appears to be a chain of equatorial clouds visible afterwards.
Many amateurs now (most notably Phil Miles, Darryl Milika and Pat Nicholas) have observed these cloud systems repeteadly providing very useful data to study this unusual equatorial cloud activity in the planet.
Updated ephemeris of the bright equatorial cloud are given below and have been calculated by Marc Delcroix.
WinJUPOS 10.3.5 (Neptune), C.M. transit times, 2017/12/03 21:05 Object longitude: L = 218,6° + 47,4020°/d * (T - 2017 Oct 22,5) Time interval: 2017 Dec 01,0 ... 2018 Feb 01,0 Output format: Date UT (C.M. of System 1) ------------------------------------------------------------------------------ 2017 Dec 01 09:08 ( 309°) 2017 Dec 02 02:48 ( 344°) 20:29 ( 19°) 2017 Dec 03 14:09 ( 54°) 2017 Dec 04 07:50 ( 89°) 2017 Dec 05 01:30 ( 124°) 19:10 ( 158°) 2017 Dec 06 12:51 ( 193°) 2017 Dec 07 06:31 ( 228°) 2017 Dec 08 00:12 ( 263°) 17:52 ( 298°) 2017 Dec 09 11:33 ( 333°) 2017 Dec 10 05:13 ( 8°) 22:54 ( 43°) 2017 Dec 11 16:34 ( 78°) 2017 Dec 12 10:15 ( 113°) 2017 Dec 13 03:55 ( 148°) 21:35 ( 182°) 2017 Dec 14 15:16 ( 217°) 2017 Dec 15 08:56 ( 252°) 2017 Dec 16 02:37 ( 287°) 20:17 ( 322°) 2017 Dec 17 13:58 ( 357°) 2017 Dec 18 07:38 ( 32°) 2017 Dec 19 01:19 ( 67°) 18:59 ( 102°) 2017 Dec 20 12:40 ( 137°) 2017 Dec 21 06:20 ( 171°) 2017 Dec 22 00:01 ( 207°) 17:41 ( 241°) 2017 Dec 23 11:21 ( 276°) 2017 Dec 24 05:02 ( 311°) 22:42 ( 346°) 2017 Dec 25 16:23 ( 21°) 2017 Dec 26 10:03 ( 56°) 2017 Dec 27 03:44 ( 91°) 21:24 ( 126°) 2017 Dec 28 15:05 ( 161°) 2017 Dec 29 08:45 ( 195°) 2017 Dec 30 02:26 ( 231°) 20:06 ( 265°) 2017 Dec 31 13:47 ( 300°) 2018 Jan 01 07:27 ( 335°) 2018 Jan 02 01:08 ( 10°) 18:48 ( 45°) 2018 Jan 03 12:28 ( 80°) 2018 Jan 04 06:09 ( 115°) 23:49 ( 150°) 2018 Jan 05 17:30 ( 185°) 2018 Jan 06 11:10 ( 219°) 2018 Jan 07 04:51 ( 254°) 22:31 ( 289°) 2018 Jan 08 16:12 ( 324°) 2018 Jan 09 09:52 ( 359°) 2018 Jan 10 03:33 ( 34°) 21:13 ( 69°) 2018 Jan 11 14:54 ( 104°) 2018 Jan 12 08:34 ( 139°) 2018 Jan 13 02:15 ( 174°) 19:55 ( 209°) 2018 Jan 14 13:36 ( 244°) 2018 Jan 15 07:16 ( 278°) 2018 Jan 16 00:56 ( 313°) 18:37 ( 348°) 2018 Jan 17 12:17 ( 23°) 2018 Jan 18 05:58 ( 58°) 23:38 ( 93°) 2018 Jan 19 17:19 ( 128°) 2018 Jan 20 10:59 ( 163°) 2018 Jan 21 04:40 ( 198°) 22:20 ( 233°) 2018 Jan 22 16:01 ( 268°) 2018 Jan 23 09:41 ( 302°) 2018 Jan 24 03:22 ( 337°) 21:02 ( 12°) 2018 Jan 25 14:42 ( 47°) 2018 Jan 26 08:23 ( 82°) 2018 Jan 27 02:03 ( 117°) 19:44 ( 152°) 2018 Jan 28 13:24 ( 187°) 2018 Jan 29 07:05 ( 222°) 2018 Jan 30 00:45 ( 256°) 18:26 ( 292°) 2018 Jan 31 12:06 ( 326°) ------------------------------------------------------------------------------