Is that a sunward fragment of C/2004 F4 at 20040417_2354 648,562 20040418_0154 659,560 or just noise or some diffraction effect? --Tony...
1232
Tony Hoffman
tonyjhoffman
Apr 18, 2004 3:57 am
The spot doesn't show in 0254, so it's presumably noise. The comet looks spectacular. By the size of the diffraction spikes, it must be quite bright. The tail...
1233
karlbattams
Apr 18, 2004 8:35 pm
Hi all, Further to the below message, if you look at ftp://lasco6.nascom.nasa.gov/pub/lasco/lastimage/level_05 then go into the appropriate date directory (ie...
1234
Maik Meyer
maiki666
Apr 19, 2004 12:57 pm
Hi all, Tony, congrats for your Marsden comet! Well done, this one was not so easy due to the fact that the images are now have larger temporal spacing...
1235
Tony Hoffman
tonyjhoffman
Apr 19, 2004 5:09 pm
... so ... only 3 ... C2. ... Thanks, Maik-- Yes, that was a tricky one (apart from the factors you mentioned, compounded by its stellar appearance--as is...
1236
jvanderau
Apr 19, 2004 6:21 pm
In looking at the C3 image on www.spaceweather.com's homepage (2004/04/19 11:54), the tail seems to be at an odd position. I would have expected it to be...
1237
Sebastian F. Hoenig
sfhoenig
Apr 19, 2004 6:32 pm
... The magic words are "differential orbital motion" and "projection". That means that dust ejected by the comet it spread along its orbital *plane*...
1238
rainerkracht
Apr 19, 2004 6:41 pm
... so ... only 3 ... C2. ... Hi Maik and Tony, I'm not 100% sure until now. The 0242 position does not really fit between the 0208 and 0342 positions. My...
1239
Maik Meyer
maiki666
Apr 19, 2004 7:32 pm
Rainer, thanks for your additional analysis. To be honest, I did not check the positions for plausibility. After Tony's second posting with positions from...
1240
Carey Johnson
quarkcsj
Apr 19, 2004 8:07 pm
Well I see that by the time I started typing this and then had to go to a meeting, that someone has already answered but I'll send this anyway. Good question,...
1241
rainerkracht
Apr 19, 2004 8:08 pm
... with ... the ... the ... I agree that the second set of positions is more consistent. But there is a problem with the second set too. The first set gives a...
1242
Carey Johnson
quarkcsj
Apr 19, 2004 8:13 pm
Aaahh, I see it now. That's why the tail has gotten shorter in the down direction, because it's been chunking it's parts off in agles of 5, 4, and 3 o'clock...
1244
Tony Hoffman
tonyjhoffman
Apr 19, 2004 8:26 pm
... along ... what ... that ... the ... Thanks, Rainer and Maik for your evaluations--the puzzle deepens. It did seem to be tailing downward more than a...
1245
karlbattams
Apr 20, 2004 9:21 pm
Hi all, I've seen a few numbers being thrown around as to estimates of the peak brightness of the comet, so I thought I'd share with you my preliminary...
1246
Grei
grei_13
Apr 20, 2004 11:19 pm
Hi everyone. I'm one of the new folks on the block, well at least on this list, and while I've tried to find a comet in the SOHO pictures before over the...
1247
Matson, Robert
rdotdaneelol...
Apr 20, 2004 11:50 pm
In answer to the last post (which unfortunately I deleted so I don't have the name of the submitter), Karl's astrometry for Bradfield just showed up on MPEC a...
1248
Carey Johnson
quarkcsj
Apr 21, 2004 6:20 am
It has been refined It first came out here: http://cfa- www.harvard.edu/iauc/08300/08319.html on the 12th although that has not been released to other than...
1249
Maik Meyer
maiki666
Apr 21, 2004 6:37 am
... you will surely have noticed that almost all of the SOHO comets have orbits that are solely based on SOHO positions. Of the about 750 SOHO comets only a...
1250
Grei
grei_13
Apr 21, 2004 9:59 am
Aye, I noticed that most of the SOHO comets had orbits plotted, but I was not aware if it was solely based on the data from the images or if there was...
1251
Sebastian F. Hoenig
sfhoenig
Apr 21, 2004 10:09 am
... From what I calculated the perturbation is negligable. This is also something that can be expected regarding the inclination of 63deg and the Argument of...
1252
Carey Johnson
quarkcsj
Apr 22, 2004 5:28 am
... If it is there is help here: http://cfa-www.harvard.edu/iau/info/OrbElsExplanation.html and here: http://cfa-www.harvard.edu/iau/icq/ICQGlossary.html ...
1253
Robert Howard
rockmh
Apr 24, 2004 3:48 am
If you look at the full animation of the Bradfield flyby you will notice that just as Bradfield starts to leave the c3 frame, sol manages to flare a bit and...
1254
Carey Johnson
quarkcsj
Apr 26, 2004 3:00 am
My estimates on the tail, based on the numbers I had to plug into my star program to make the tail match what I saw against the background stars was 0.12AU....
1255
Grei
grei_13
Apr 26, 2004 3:56 am
Admittedly 99% of what I know about astronomy and comets in particular is self taught, but I don't think that the particles of a comet's tail would ever end up...
1256
Tony Hoffman
tonyjhoffman
Apr 26, 2004 12:40 pm
As a point of reference, coronal mass ejections are *very* frequent in SOHO images (up to 1 a day at solar minimum, 5 a day at solar maximum, if I remember the...
1257
rainerkracht
Apr 27, 2004 7:31 pm
LASCO recovery is scheduled for Thursday: http://soho.nascom.nasa.gov/soc/timeline Rainer...
1258
XingMing Zhou
soho_comet
May 1, 2004 2:55 am
Faint, with short tail. 1024 X 1024, 0,0 in lower left corner. Apr 30,2004 Time X ,Y 0550 461,71 0606 469,83 0626 479,99 Regards, XingMing Zhou...
1259
Michael Boschat
mikeboschat
May 1, 2004 3:11 am
Hmmmm...looks like one, need one image before 0550 UT... ... -- Clear skies ... Michael Boschat Halifax Center - Royal Astronomical Society of Canada Astronomy...
1260
Tony Hoffman
tonyjhoffman
May 1, 2004 5:05 am
XingMing, It looks real to me. Congratulations on what should, if there are enough images, be your 50th comet! Are you having trouble connecting to the...
1261
Maik Meyer
maiki666
May 1, 2004 5:42 am
Hi all, congrats Karl to number 49. The next one may be the happy one. Please remember, I will assign the prize after the confirmation by the MPEC is out. This...
