Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Neptune: new ephemeris for 2015 spotA2

This topic has been archived. This means that you cannot reply to this topic.
4 replies to this topic

#1 Marc Delcroix

Marc Delcroix

    Viking 1

  • -----
  • topic starter
  • Posts: 543
  • Joined: 26 Aug 2007

Posted 25 August 2015 - 11:04 AM

Dears,


Thanks to the latest observations made these last 2 weeks, I could confirm that the spot we observe accelerated its drift. I now estimate it around 26°/Julian Day, and measured the latitude around -42°.

The new ephemeris (I call it now spotA2 to identify the shift in drift) is made with the best fitted observations, from Alexander Obukhov (Russia), Stéphane Gonzalès (France) and A. Garbelini (Brazil). Thanks not only to them, but also to all other Neptune's observers (John, Constantin, Nick, Paul, Stefan, Wilhem, ...).

Surprisingly this drift line matches an observation I made which was perfectly aligned with the previous drift on Aug. 3rd, hint maybe that the spot started changing it's speed jsut after that date.

Here are the new ephemeris, close to the ones Alexander made out of his 2 observations (mine is derived from 8 observations):


WinJUPOS 10.2.0 (Neptune), C.M. transit times, 2015/08/25 17:50
Object longitude: L = 273,8° + 25,9898°/d * (T - 2015 Aug 16,5)
Time interval: 2015 Aug 03,0 ... 2015 Oct 01,0
Output format: Date UT (C.M. of System 1)
------------------------------------------------------------------------------
2015 Aug 03 04:28 ( 288°) 21:24 ( 306°)
2015 Aug 04 14:20 ( 324°)
2015 Aug 05 07:16 ( 343°)
2015 Aug 06 00:11 ( 1°) 17:07 ( 19°)
2015 Aug 07 10:03 ( 38°)
2015 Aug 08 02:59 ( 56°) 19:54 ( 74°)
2015 Aug 09 12:50 ( 93°)
2015 Aug 10 05:46 ( 111°) 22:42 ( 130°)
2015 Aug 11 15:37 ( 148°)
2015 Aug 12 08:33 ( 166°)
2015 Aug 13 01:29 ( 185°) 18:24 ( 203°)
2015 Aug 14 11:20 ( 221°)
2015 Aug 15 04:16 ( 239°) 21:12 ( 258°)
2015 Aug 16 14:07 ( 276°)
2015 Aug 17 07:03 ( 294°) 23:59 ( 313°)
2015 Aug 18 16:55 ( 331°)
2015 Aug 19 09:50 ( 349°)
2015 Aug 20 02:46 ( 8°) 19:42 ( 26°)
2015 Aug 21 12:38 ( 45°)
2015 Aug 22 05:33 ( 63°) 22:29 ( 81°)
2015 Aug 23 15:25 ( 99°)
2015 Aug 24 08:21 ( 118°)
2015 Aug 25 01:16 ( 136°) 18:12 ( 154°)
2015 Aug 26 11:08 ( 173°)
2015 Aug 27 04:04 ( 191°) 20:59 ( 209°)
2015 Aug 28 13:55 ( 228°)
2015 Aug 29 06:51 ( 246°) 23:47 ( 265°)
2015 Aug 30 16:43 ( 283°)
2015 Aug 31 09:38 ( 301°)
2015 Sep 01 02:34 ( 319°) 19:30 ( 338°)
2015 Sep 02 12:26 ( 356°)
2015 Sep 03 05:21 ( 14°) 22:17 ( 33°)
2015 Sep 04 15:13 ( 51°)
2015 Sep 05 08:09 ( 70°)
2015 Sep 06 01:04 ( 88°) 18:00 ( 106°)
2015 Sep 07 10:56 ( 124°)
2015 Sep 08 03:52 ( 143°) 20:48 ( 161°)
2015 Sep 09 13:43 ( 179°)
2015 Sep 10 06:39 ( 198°) 23:35 ( 216°)
2015 Sep 11 16:31 ( 235°)
2015 Sep 12 09:27 ( 253°)
2015 Sep 13 02:22 ( 271°) 19:18 ( 289°)
2015 Sep 14 12:14 ( 308°)
2015 Sep 15 05:10 ( 326°) 22:05 ( 344°)
2015 Sep 16 15:01 ( 3°)
2015 Sep 17 07:57 ( 21°)
2015 Sep 18 00:53 ( 39°) 17:49 ( 58°)
2015 Sep 19 10:44 ( 76°)
2015 Sep 20 03:40 ( 94°) 20:36 ( 113°)
2015 Sep 21 13:32 ( 131°)
2015 Sep 22 06:28 ( 150°) 23:24 ( 168°)
2015 Sep 23 16:19 ( 186°)
2015 Sep 24 09:15 ( 204°)
2015 Sep 25 02:11 ( 223°) 19:07 ( 241°)
2015 Sep 26 12:03 ( 260°)
2015 Sep 27 04:58 ( 278°) 21:54 ( 296°)
2015 Sep 28 14:50 ( 314°)
2015 Sep 29 07:46 ( 333°)
2015 Sep 30 00:42 ( 351°) 17:38 ( 10°)
------------------------------------------------------------------------------


Keep up the good work, this is important as professional facilities should observe Neptune in the next two months, and these forecasts are useful.

Steady skies,

Edited by Marc Delcroix, 25 August 2015 - 01:58 PM.


#2 happylimpet

happylimpet

    Fly Me to the Moon

  • *****
  • Posts: 5,963
  • Joined: 29 Sep 2013

Posted 25 August 2015 - 11:09 AM

Good work Marc!

 

Its fun and satisfying to be part of something at the edge of knowledge!!!!

 

So we have spot A2 and still spot B I think.....do you think there are any other spots?



#3 Alexander Obukhov

Alexander Obukhov

    Ranger 4

  • -----
  • Posts: 306
  • Joined: 10 Aug 2014

Posted 25 August 2015 - 12:52 PM

Good work and very useful information, Marc.  :waytogo:



#4 Sunspot

Sunspot

    Voyager 1

  • *****
  • Posts: 10,342
  • Joined: 15 Mar 2005

Posted 25 August 2015 - 05:03 PM

Now, if i could find a way to change all the white spots on my CSC to blue or dark blue... :undecided:



#5 Marc Delcroix

Marc Delcroix

    Viking 1

  • -----
  • topic starter
  • Posts: 543
  • Joined: 26 Aug 2007

Posted 25 August 2015 - 05:51 PM

Thanks guys!

Nick, I have not identified other spots to be seen yet, but there could be ... Identifying them is difficult on Neptune, and I wait to have at least 3-4 observations well aligned (ie drifting on the same "line") to say we have something ...


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics