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Neptune spotA et spotB ephemeris

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#1 Marc Delcroix

Marc Delcroix

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Posted 09 August 2015 - 08:38 AM

Dears,

 

We now have at least two spots visible by amateurs on Neptune. The first one, for which I already published ephemeris, is located at ~-41° latitude, here on one of my images:

n20150720i-02h32.5UT-MDe.jpg

 

WinJUPOS 10.2.0 (Neptune), C.M. transit times, 2015/08/03  15:50
Object longitude: L =  28,2° + 24,2982°/d * (T - 2015 Jul 23,5)
Time interval: 2015 Jul 12,0 ... 2015 Oct 01,0
Output format: Date UT (C.M. of System 1)
------------------------------------------------------------------------------
2015 Aug 01   01:52 ( 237°)   18:44 ( 254°)
2015 Aug 02   11:36 ( 271°)
2015 Aug 03   04:29 ( 288°)   21:21 ( 305°)
2015 Aug 04   14:13 ( 322°)
2015 Aug 05   07:06 ( 339°)   23:58 ( 356°)
2015 Aug 06   16:51 (  13°)
2015 Aug 07   09:43 (  30°)
2015 Aug 08   02:35 (  47°)   19:28 (  65°)
2015 Aug 09   12:20 (  82°)
2015 Aug 10   05:12 (  99°)   22:05 ( 116°)
2015 Aug 11   14:57 ( 133°)
2015 Aug 12   07:50 ( 150°)
2015 Aug 13   00:42 ( 167°)   17:34 ( 184°)
2015 Aug 14   10:27 ( 201°)
2015 Aug 15   03:19 ( 218°)   20:12 ( 236°)
2015 Aug 16   13:04 ( 252°)
2015 Aug 17   05:56 ( 269°)   22:49 ( 287°)
2015 Aug 18   15:41 ( 304°)
2015 Aug 19   08:33 ( 321°)
2015 Aug 20   01:26 ( 338°)   18:18 ( 355°)
2015 Aug 21   11:11 (  12°)
2015 Aug 22   04:03 (  29°)   20:55 (  46°)
2015 Aug 23   13:48 (  63°)
2015 Aug 24   06:40 (  80°)   23:33 (  98°)
2015 Aug 25   16:25 ( 114°)
2015 Aug 26   09:17 ( 131°)
2015 Aug 27   02:10 ( 149°)   19:02 ( 166°)
2015 Aug 28   11:55 ( 183°)
2015 Aug 29   04:47 ( 200°)   21:39 ( 217°)
2015 Aug 30   14:32 ( 234°)
2015 Aug 31   07:24 ( 251°)

 

2015 Sep 01   00:17 ( 268°)   17:09 ( 285°)
2015 Sep 02   10:02 ( 303°)
2015 Sep 03   02:54 ( 320°)   19:46 ( 336°)
2015 Sep 04   12:39 ( 354°)
2015 Sep 05   05:31 (  11°)   22:24 (  28°)
2015 Sep 06   15:16 (  45°)
2015 Sep 07   08:08 (  62°)
2015 Sep 08   01:01 (  79°)   17:53 (  96°)
2015 Sep 09   10:46 ( 113°)
2015 Sep 10   03:38 ( 130°)   20:31 ( 148°)
2015 Sep 11   13:23 ( 164°)
2015 Sep 12   06:15 ( 181°)   23:08 ( 199°)
2015 Sep 13   16:00 ( 216°)
2015 Sep 14   08:53 ( 233°)
2015 Sep 15   01:45 ( 250°)   18:38 ( 267°)
2015 Sep 16   11:30 ( 284°)
2015 Sep 17   04:23 ( 301°)   21:15 ( 318°)
2015 Sep 18   14:07 ( 335°)
2015 Sep 19   07:00 ( 352°)   23:52 (   9°)
2015 Sep 20   16:45 (  27°)
2015 Sep 21   09:37 (  44°)
2015 Sep 22   02:30 (  61°)   19:22 (  78°)
2015 Sep 23   12:15 (  95°)
2015 Sep 24   05:07 ( 112°)   22:00 ( 129°)
2015 Sep 25   14:52 ( 146°)
2015 Sep 26   07:44 ( 163°)
2015 Sep 27   00:37 ( 180°)   17:29 ( 197°)
2015 Sep 28   10:22 ( 215°)
2015 Sep 29   03:14 ( 231°)   20:07 ( 249°)
2015 Sep 30   12:59 ( 266°)
------------------------------------------------------------------------------

 

I could recover a second spot from 2 amateur and 2 professionnal images, spot B in the Northern hemisphere at about 20° latitude, here on an English amateur's image :

n20150731i-02h30UT-NHa.jpg

 

WinJUPOS 10.2.0 (Neptune), C.M. transit times, 2015/08/06  15:47
Object longitude: L =  42,3° + 70,8993°/d * (T - 2015 Jul 25,5)
Time interval: 2015 Jul 12,0 ... 2015 Oct 01,0
Output format: Date UT (C.M. of System 1)
------------------------------------------------------------------------------
2015 Aug 01   15:53 ( 190°)

2015 Aug 02   10:27 ( 245°)
2015 Aug 03   05:01 ( 300°)   23:34 ( 354°)
2015 Aug 04   18:08 (  49°)
2015 Aug 05   12:42 ( 104°)
2015 Aug 06   07:15 ( 159°)
2015 Aug 07   01:49 ( 214°)   20:23 ( 269°)
2015 Aug 08   14:57 ( 324°)
2015 Aug 09   09:30 (  18°)
2015 Aug 10   04:04 (  73°)   22:38 ( 128°)
2015 Aug 11   17:12 ( 183°)
2015 Aug 12   11:45 ( 238°)
2015 Aug 13   06:19 ( 293°)
2015 Aug 14   00:53 ( 347°)   19:27 (  42°)
2015 Aug 15   14:00 (  97°)
2015 Aug 16   08:34 ( 152°)
2015 Aug 17   03:08 ( 207°)   21:42 ( 262°)
2015 Aug 18   16:15 ( 316°)
2015 Aug 19   10:49 (  11°)
2015 Aug 20   05:23 (  66°)   23:57 ( 121°)
2015 Aug 21   18:30 ( 176°)
2015 Aug 22   13:04 ( 231°)
2015 Aug 23   07:38 ( 286°)
2015 Aug 24   02:12 ( 340°)   20:45 (  35°)
2015 Aug 25   15:19 (  90°)
2015 Aug 26   09:53 ( 145°)
2015 Aug 27   04:27 ( 200°)   23:00 ( 254°)
2015 Aug 28   17:34 ( 309°)
2015 Aug 29   12:08 (   4°)
2015 Aug 30   06:42 (  59°)
2015 Aug 31   01:16 ( 114°)   19:49 ( 169°)

 

2015 Sep 01   14:23 ( 223°)
2015 Sep 02   08:57 ( 278°)
2015 Sep 03   03:31 ( 333°)   22:04 (  28°)
2015 Sep 04   16:38 (  83°)
2015 Sep 05   11:12 ( 138°)
2015 Sep 06   05:46 ( 193°)
2015 Sep 07   00:20 ( 248°)   18:53 ( 302°)
2015 Sep 08   13:27 ( 357°)
2015 Sep 09   08:01 (  52°)
2015 Sep 10   02:35 ( 107°)   21:09 ( 162°)
2015 Sep 11   15:42 ( 216°)
2015 Sep 12   10:16 ( 271°)
2015 Sep 13   04:50 ( 326°)   23:24 (  21°)
2015 Sep 14   17:58 (  76°)
2015 Sep 15   12:31 ( 130°)
2015 Sep 16   07:05 ( 185°)
2015 Sep 17   01:39 ( 240°)   20:13 ( 295°)
2015 Sep 18   14:47 ( 350°)
2015 Sep 19   09:20 (  45°)
2015 Sep 20   03:54 ( 100°)   22:28 ( 154°)
2015 Sep 21   17:02 ( 209°)
2015 Sep 22   11:36 ( 264°)
2015 Sep 23   06:10 ( 319°)
2015 Sep 24   00:43 (  14°)   19:17 (  69°)
2015 Sep 25   13:51 ( 123°)
2015 Sep 26   08:25 ( 178°)
2015 Sep 27   02:59 ( 233°)   21:33 ( 288°)
2015 Sep 28   16:06 ( 343°)
2015 Sep 29   10:40 (  38°)
2015 Sep 30   05:14 (  92°)   23:48 ( 147°)
------------------------------------------------------------------------------

 

Happy hunting, and do not forget to send me your images so I could measure them and continue this study!

 

Steady skies,

 


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