OBS-V: C/2006 M4 (SWAN)

OBS-V: C/2006 M4 (SWAN)

OCT 29, 2006

The sky was much clearer than a few days ago. It happened to be a weekend so that I planned to go on with my observation of the comet C/2006 M4 (SWAN) in my grandma’s home where lies in the northeastern suburb. So I did.

The sky was almost dark though a crescent still hung in the low sky. However, the sky near the western horizon was hazy because the road not far from my spot was under re-construction. But it didn’t matter much. A not-very-bright light was on that influenced my searching a bit as well.

It was about a quarter past ten (UT) that I started my observation. The position of the comet was very easy found as well as I could see it exactly through the finder, which formed a giant difference between the one did in the city and in the suburb. I caught the sight of the bright comet through the main telescope immediately. The strong condensation and the large size of its diameter gave me a deep impression.

I made two sketches and measured some data of it. Here comes the measurement:

Comet C/2006 M4 (SWAN)
2006 Oct. 29.47UT, ml=5.0, Dia.=11′, DC=7.5, 10.0cm-refractor, f/7, (28X/70X)
PS: I observed in the northern suburb and sky was much darker, however, an avenue not far from my observational spot is under construction so that the lower sky was influenced by the dust. In spite of these, the comet was very easy to be seen and the coma was really large.

I stopped me observation at about twelve o’ clock that was it took me 1 hour and forty-five minutes to complete my whole observation.

I had to take the agricultural courses in Sihui, Zhaoqing from Oct 30 to Nov 3. It was really hard to squeeze the free time out but finally I came with an idea was that doing my observations of the comet C/2006 M4 (SWAN) after finishing my bathing. So I did and it really helped a lot during these days. The only equipment with me there was my militarian binoculars 15×50.

OCT 30, 2006

I settled in the yard at about two o’clock (UT). The sky was really blue there. I did my observation at once after finishing my bathing as I promised before. It was about 10: 15UT. Maybe I behaved a strange way that a guard followed me all the time. I was told that I could only walk within the square, which was shone by two very bright lights seriously. To make matters worse, the moon lit brightly as well. In spite of all of these, I could get to the position easily where the comet was. Soon I saw the comet in the field without much difficulty. It located between the stars ε and ζ Her. , next to 53 Her. It was more diffuse than several days ago and the brightness has faded down to about 5.3m according to my measurement. To my surprise, I can see the tail of 1-deg. in p.a. 35 deg. I finished my observation at about 11: 00 UT.

OCT 31, 2006

The sky turned to hazy in the evening and covered with thin clouds. Moonlight also influenced strongly. I observed the comet almost the same time. The three fix stars mentioned above were still easily seen but the comet was not. I spent quite a lot of time proving whether I caught it or not. Thanks to my effort, I caught the sight of the barely-seen comet finally. The magnitude of it was hard to measure under such poor condition. I could only say it was fainter than 5.3m. The observation was completed at about 10: 50 UT.

NOV 01, 2006

The moon was hidden from the clouds; no stars were seen that night. I didn’t do my observation.

NOV 02, 2006

The last night we had in that place. We beat the teacher there 3: 0 in a football match. I didn’t feel much pressure during the match. I began with my search at about 10: 20 UT. The sky turned fine again and the transparency was excellent today. However, the moon lit more strongly, which serious influenced my observation of my lovely comet. But I caught the comet without any difficulty. It was surprised that I could see its tail of 1.5-deg. in p.a. 35-deg.!!! Supposing that if no moonlight, it’ll be more enormous. My search was over at about 11: 10 UT.

NOV 05, 2006

Weekend again and I’ve already come back, so I did my observation of the comet C/2006 M4 (SWAN) in the northern suburb again. I started my observation at about 10: 15 UT. Firstly I could see the comet in the finder barely, but, when the extremely bright moon rose above the mountains in the east, a lot of faintest stars in the field were hidden. I could still catch details of the comet without too much hardness. Here comes the consequence of the observation this time:

C/2006 M4 (SWAN):
2006 Nov. 05.46 UT: m1=5.6, Dia.=7′, DC=7, 10.0cm-refractor, f/7, 28x…

PS: Moonlight strongly interfered. Very clear sky! Though I didn’t see the tail of
the comet, I could "feel" that it directed in P.A.=40 deg.

I completed my observation at 12: 05 UT.

All of the recent observations were written into the ICQ format:

IIIYYYYMnL YYYY MM DD.DD eM/mm.m:r AAA.ATF/xxxx /dd.ddnDC /t.ttmANG ICQ XX*OBSxx
   2006M4  2006 10 29.47  M  5.0 TK 10.0R 7  28  11    7/  1     40 ICQ XX  XUxx
   2006M4  2006 10 30.45  M  5.3 TK  5.0B    15  10    7/  1     35 ICQ XX  XUxx
   2006M4  2006 10 31.45  M [5.3 TK  5.0B    15   8    6            ICQ XX  XUxx
   2006M4  2006 11 02.45  M  5.4 TK  5.0B    15   9    6   1.5   35 ICQ XX  XUxx

   2006M4  2006 11 05.46  M  5.6 TJ 10.0R 7  28   7    7            ICQ XX  XUxx

OBS-V: C/2006 M4 (SWAN)

Imaging Process (3)



Go on with the Solwind files. I’ve tried to get hang of the skills for nearly a week. I downloaded the files in which some known Solwind comets were detected so that I can be familiar with it. Some images and animations are offered below.


Solwind-7 or C/1981 W1 discovered by R. Kracht in the images of 1981 Nov 20 on July 30, 2005.


More to come.

Imaging Process (3)

Imaging Process(2)


Go on! But now are the Solwind images, not the SOHO files. Are there any potential Kreutz comets in those files? Yeah! But most of them were dug out by R. Kracht, who is one of the greatest German SOHO hunters in the world. Let me check them cautiously when I get hang of the skills. As I know, nobody in China has found any Solwind comets, which embarrass me “a bit”. 

Ooh, here are the tiny “achievements”.

1980/02/10 00:37:38 UT

1980/02/10 00:47:23 UT

1980/02/10 00:57:09 UT

1980/02/10 01:06:55 UT

1980/02/10 01:16:40 UT

 The combined image is Solwind-10 that was discovered by Kracht on July 23, 2005, in the images of 1984 September 15. Copyright @ Kracht.

Solwind-10, a non-Kreutz comet, was discovered by Kracht. 

Contrasted with SMM C/P images.

Okay, that’s all I’ve for now. Uuh… I’m really tired since I got back. Well, goodnight!

Imaging Process(2)

SOHO comets (Sep. & Oct.)

Sep 13 2006 14:33:53 Mr Sungrazer


Soho# Date/Time of Post Discoverer Tel Group Images of..
1186 Sep02,06 12:54:52 H.Su C2 Meyer Sep02,06
1187 Sep11,06 15:04:09 T.Hoffman C3 Kreutz Sep11-12,06
Well, it looks like we only have six or seven images showing
Tony's Kreutz. Oh well, better than nothing, I suppose...
Well done to Hua Su for spotting the first Meyer-group comet we
have had in a very long time! Fortunately we got plenty of images
for that one.
We should get our normal image quota back next week. Until then,
please keeping checking what few images we have for the return of
C/2002 R5 (there's a prize for its recovery...).
As always, email me with any questions, concerns, etc.












Sep 20 2006 13:26:49 Mr Sungrazer


Soho# Date/Time of Post Discoverer Tel Group Images of..
1188 Sep18,06 03:11:18 R.Matson C3,C2 Kreutz Sep18,06
1189 Sep18,06 17:01:56 R.Matson C3,C2 Kreutz Sep18-19,06
1190 Sep18,06 17:04:52 R.Matson C3,C2 Kreutz Sep18-19,06
1191 Sep18,06 17:12:05 R.Matson C3,C2 Kreutz Sep18-19,06
1192 Sep18,06 17:44:10 R.Matson C3,C2 Kreutz Sep18-19,06
Wow! Many congratulations to Rob on his five-comet haul! It is
amazing for several reasons, including the first time we've had
five C3 comets in less than a day and the first time a comet
hunter has found five realtime comets in a day (four of which
were within less than an hour)!! Amazing stuff -- well done, Rob!
We're officially out of that horrible keyhole now so we should
have plenty of realtime data and almost all gaps filled 100%.
I hope you all like (or at least tolerate) that changes I have
made to the comet report form. Please let me know if you have
any problems with it. I have decided to keep a permanent link to
the old repotr form in case any of you have a preference. The
link can be found immediately beneath the current report form.
Email me with questions, etc.
















Oct 06 2006 15:21:04 Mr Sungrazer


Soho# Date/Time of Post Discoverer Tel Group Images of..
1193 Sep26,06 17:40:42 R.Matson C3,C2 Kreutz Sep26-27,06
1194 Oct02,06 11:14:54 H.Su C3,C2 Kreutz Sep30,06
1195 Oct02,06 13:31:51 R.Matson C3,C2 Kreutz Oct02,06
1196 *Oct03,06 10:54* H.Su C3,C2 Kreutz Oct03,06
1197 *Oct03,06 11:40* G.Sun,T.Chen C3,C2 Kreutz Oct03,06
1198 Oct06,06 03:59:29 W.Xu C2 Kreutz Oct06,06
Note that the posts marked with a * were reports made to the
sohohunter chat page. Gouyou Sun and Tao Chen reported their
comet within a minute of each other and, as I can not be
certain on the timing of the sohohunter reports, they get
joint credit for the discovery.
As always, all (sensible) unretracted claims were checked. Please
email me if you have any questions.
I do not think the comet website will go down again any time soon
so you should not need to make any more reports to the sohohunter
page. If you are unsure, you are welcome to email your reports to
Have a great weekend!
















Oct 20 2006 15:00:28 Mr Sungrazer


Soho# Date/Time of Post Discoverer Tel Group Images of..
1199 Oct10,06 16:15:36 B.Zhou C2 Meyer Oct10,06
1200 Oct10,06 19:57:03 B.Zhou C2 Kreutz Oct10,06
1201 Oct15,06 18:08:14 T.Hoffman C3,C2 Kreutz Oct15,06
1202 Oct16,06 08:50:43 T.Hoffman C3,C2 Kreutz Oct15,06
1203 Oct17,06 11:27:00 T.Scarmato C3,C2 Kreutz Oct16,06
1204 Oct19,06 18:00:40 S.Farmer Jr. C3,C2 Kreutz Oct19-20,06
1205 Oct20,06 00:39:37 T.Hoffman C2 Meyer Oct20,06
1206 Oct17,06 18:12:03 B.Zhou C2 Kreutz Oct12,06
I'm pretty certain I checked all the claims but if you feel
particularly hard-done-by then please email me.











Nov 02 2006 11:12:08 Mr Sungrazer

Confirmations, as promised:

Soho# Date/Time of Post Discoverer Tel Group Images of..
1207 Oct24,06 10:13:49 H.Su C3,C2 Kreutz Oct24,06
1208 Oct24.06 14:03:06 T.Chen C2 Kreutz Oct24,06
1209 Oct25,06 10:48:26 H.Su C2 Kreutz Oct25,06
1210 Oct29,06 09:27:08 H.Su C3,C2 Kreutz Oct28,06
1211 Oct29,06 10:08:34 L.Cane C3,C2 Kreutz Oct28,06
1212 Oct29,06 10:14:50 Kracht/Su/Chen C2 Kreutz Oct30,06
1213 Nov01,06 20:01:32 J.Sachs C3,C2 Kreutz Nov01-??,06
1214 Nov02,06 10:09:56 H.Su C2 Kreutz Apr06,03
XC55 Oct30,06 09:49:27 B.Zhou C2 ?Kreutz? Oct17,03
There was a lot of "noise" on the reports page this time around.
90% of this can be eliminated if people would wait for a third
image before making a report. So please do so unless you are
convinced your object is real.
Bo's archive claim looks like it's real but it is just too faint
to be sure. It couldn't get good positions for it, either, so it
becomes X-Comet #55. Sorry, Bo! The archive report from Hua was
much better and I got six or seven good positions for it.
Congratulations to John on his fantastic Kreutz comet -- already
it is looking very nice indeed and must be at least a 4th mag
object. It wouldn't surprise me to see it saturate C2 a little.
Great find, John!
Please email me with questions, concerns, etc.

SOHO comets (Sep. & Oct.)