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Neptune equatorial features

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)
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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°)
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