My SOHO comet discoveries

　

SOHO C3 image

(Click to enlarge)

SOHO C2 images

(Click to enlarge)

I started my search for SOHO comets in August, 2005. At the beginning I made a great number of false reports unfortunately. In late October, things were turning better. Then, I discovered my first  SOHO comet in time on November 19, 2005, which made a double comet with the one that Jiangao Ruan found. Since then I've discovered several comets, but also losing quite a lot. All the comets I found up to now are Kreutz group. To know more about the Kreutz group, please pay a visit here: Kreutz group. 

　

SOHO comets discovered to date: 8

PS: All comets are members of the Kreutz group if not stated otherwise. 

No. Disc. Date IAU designation   SOHO des.    Discovery     Discoverers
               MPEC link                      Telescope     Notes / Images
 1  11/19/2005 C/2005 W7  (SOHO) SOHO-1050       C3         Wentao Xu (Animation-1, Animation-2)
 2  05/20/2006 C/2006 K10 (SOHO) SOHO-1143       C2         Wentao Xu (Animation)
 3  06/05/2006 C/2006 L4  (SOHO) SOHO-1159       C2         Wentao Xu (Animation)
 4  07/14/2006 C/2006 N3  (SOHO) SOHO-1173       C3         Wentao Xu (Animation)
 5  10/06/2006 C/2006 T5  (SOHO) SOHO-1198       C2         Wentao Xu (Animation)
 6  12/27/2006 C/2006 Y13 (SOHO) SOHO-1247       C3         Wentao Xu (Animation)
 7  12/28/2006 C/2006 Y15 (SOHO) SOHO-1250       C3         Wentao Xu (Animation)
 8  01/19/2007 C/2007 B5  (SOHO) SOHO-1258       C3         Wentao Xu (Animation)

　

The discovery stories: 

1. C/2005 W7  (SOHO)

Reports + further measurements

PS: Those pixel coordinates can be converted into equational or ecliptic ones according to the dates and times, which may be enough for rough orbital calcutions. I can certainly use my own not-very-accurate-datum for my own work. There are more about these work and files what we call "SOHO comet astrometry" here: SOHO comet astrometry text files. 

IAU Astrometry Files for my comets 

PS: All of the measurements are taken by D.Biesecker, C.St.Cyr, D.Hammer, K.McGleam and K.Battams.

Notes: 

# Observations: This shows the complete numbers of observations (positions) recorded for the comet. It also shows the year of the comet discovery.

DATE TIME (hrs): This is the date and time of the observation.

S/C-X (AU) S/C-Y (AU) S/C-Y (AU): This is the position of the SOHO satellite from Earth (in AU).

# OBJECTS: This is the number of objects in this observation. This number includes the object (comet) and stars recorded.

SAO: This is the HD Catalog number (incorrectly labelled as SAO in the reports: now corrected) of the stars recorded. A zero implies the position is that of the comet.

x-pixel y-pixel: This is the x,y position of the object (comet or star). The origin (0,0) is always in the lower-left of the image. The image size is 1024x1024 for the vast majority of the files.

RA(HIC) DEC(HIC) / KNOW / DATE TIME (UT) / EXP: The "RA" and "DEC" are position elements of the recorded stars. "Know" refers to whether the object is a known (eg a star = 1) or unknown (eg a comet = 0) object. "Date" and "time" are the image date and time. "Exp" is the exposure time of the image
Note: There is a minor change in IAU files later than SOHO-819. In the first line, along-side #Observations you will see the SOHO# (format: SOHO-xxx), camera (eg C2, C3, SWAN, etc) and discoverer(s) name(s).

　

SOHO-1050- C/2005 W7 (SOHO)

My eighth discovery: 

Jan 19 2007 05:29:23 Wentao Xu 
Potential comet:
Images: C3; 1024x1024 images.
(0,0) Upper Left.
2007/01/19
   Kreutz group comet.
0742  258  710
0818  262  707
0842  265  704
0942  272  696
--Wentao Xu
Jan 19 2007 05:55:04 Wentao Xu 
Further to my post of...
Images: C3; 1024x1024 images.
(0,0) Upper Left.
2007/01/19     05:29:23
Kreutz group comet.
0418  235  736
0442  239  733
0518  242  729
0618  248  721
0642  251  718
1020  278  691
--Wentao Xu

More measurements (frames in the animation): 

picture name         position
20070119_0418_c3.gif (235,736)
20070119_0442_c3.gif (238,733)
20070119_0518_c3.gif (242,729)
20070119_0618_c3.gif (249,722)
20070119_0642_c3.gif (251,719)
20070119_0742_c3.gif (259,711)
20070119_0818_c3.gif (262,707)
20070119_0842_c3.gif (265,704)
20070119_0942_c3.gif (272,696)
20070119_1020_c3.gif (277,691)
20070119_1042_c3.gif (279,689)
20070119_1142_c3.gif (287,681)
20070119_1818_c3.gif (341,626)
20070119_1842_c3.gif (346,623)
20070119_1942_c3.gif (356,614)
20070119_2042_c3.gif (366,605)
20070119_2142_c3.gif (376,596)
20070119_2218_c3.gif (382,592)

　

My seventh discovery: 

Dec 29 2006 00:43:47 Wentao Xu 
Potential comet:
Images: C3; 1024x1024 images.
(0,0) Upper Left.
2006/12/29
   Kreutz group comet.
0342  365  694
0418  367  689
0442  368  685
0518  371  681
--Wentao Xu
Dec 29 2006 05:14:15 Wentao Xu 
Further to my post of...
Images: C3; 1024x1024 images.
(0,0) Upper Left.
2006/12/29     00:43:47
0218  361  709
0542  372  676
0618  375  670
0642  375  666
--Wentao Xu

The images I had for measuring coordinates of the comet: 

picture size: 1024 * 1024

picture name         position
20061229_0218_c3.gif (361,709)
20061229_0242_c3.gif (362,706)
20061229_0318_c3.gif (364,698)
20061229_0342_c3.gif (365,694)
20061229_0418_c3.gif (367,689)
20061229_0442_c3.gif (368,685)
20061229_0518_c3.gif (371,681)
20061229_0542_c3.gif (372,676)
20061229_0618_c3.gif (375,670)
20061229_0642_c3.gif (375,666)

　

My sixth discovery: 

Dec 28 2006 00:25:55 Wentao Xu 
Potential comet:
Images: C3; 1024x1024 images.
(0,0) Upper Left.
2006/12/18
   Kreutz group comet.
0342  360  687
0418  363  682
0442  364  679
--Wentao Xu
Dec 28 2006 00:44:54 Wentao Xu 
Further to my post of...
Images: C3; 1024x1024 images.
(0,0) Upper Left.
2006/12/28     00:25:55
Kreutz group comet.
0142  353  704
0342  360  687
0418  362  682
0442  363  679
0518  365  674
--Wentao Xu

C3: 

picture size: 1024 * 1024

picture name         position
20061228_0142_c3.gif (353,704)
20061228_0342_c3.gif (360,687)
20061228_0418_c3.gif (362,682)
20061228_0442_c3.gif (363,679)
20061228_0518_c3.gif (365,674)
20061228_0618_c3.gif (369,664)
20061228_0642_c3.gif (371,661)
20061228_0742_c3.gif (375,652)
20061228_0842_c3.gif (379,643)
20061228_0918_c3.gif (382,637)
20061228_1118_c3.gif (392,618)
20061228_1142_c3.gif (396,614)
20061228_1218_c3.gif (398,610)
20061228_1242_c3.gif (400,606)

C2: 

picture size: 1024 * 1024

picture name         position
20061228_1230_c2.gif ( 7,855)
20061228_1254_c2.gif (19,836)
20061228_1331_c2.gif (37,806)
20061228_1354_c2.gif (49,789)
20061228_1406_c2.gif (56,779)
20061228_1430_c2.gif (69,759)

　

My fifth discovery: 

Oct 06 2006 03:59:29 Wentao Xu 
Potential comet:
Images: C2; 1024x1024 images.
(0,0) Upper Left.
20061006
   Kreutz group comet.
0654  958  956
0731  922  923
--Wentao Xu
Oct 06 2006 04:16:44 Wentao Xu 
Further to my post of...
Images: C2; 1024x1024 images.
(0,0) Upper Left.
20061006     03:59:29
Kreutz group comet.
0654  958  956
0731  921  923
0754  898  902
--Wentao Xu

　

My fourth discovery: 

Jul 14 2006 07:32:11 Wentao Xu 
Potential comet:
Images: C3    (0,0) Upper Left.
1024x1024 images.
20060714
   Kreutz group comet.
0842  694  793
0918  691  789
0942  690  787
1020  687  783

--Wentao Xu
Jul 14 2006 08:46:46 Wentao Xu 
Further to my post of...
Images: C3    (0,0) Upper Left.
1024x1024 images.
20060714     07:32:11
Kreutz group comet.
1142  683  774
1218  681  770

--Wentao Xu

　

My third discovery: 

Jun 05 2006 09:06:09 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Potential comet:
Images: C2    (0,0) Upper Left.
1024x1024 images.
20060604
   Kreutz group comet.
1400  725  1014
1412  726  1006

--Wentao Xu
Jun 05 2006 09:12:05 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Further to my post of...
Images: C2    (0,0) Upper Left.
1024x1024 images.
20060605     09:06:09
Kreutz group comet.
1436  729  992
1448  730  985
1500  731  977
1512  732  970
1536  733  954

--Wentao Xu

　

My second discovery: 

May 20 2006 10:13:46 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Potential comet:
Images: C2    (0,0) Upper Left.
1024x1024 images.
20060520
   Kreutz group comet.
1331  531  1008
1354  539  991

--Wentao Xu
May 20 2006 10:16:36 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Further to my post of...
Images: C2    (0,0) Upper Left.
1024x1024 images.
20060520     10:13:46
Kreutz group comet.
1406  542  986

--Wentao Xu
May 20 2006 10:49:12 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Further to my post of...
Images: C2    (0,0) Upper Left.
1024x1024 images.
20060520     10:13:46
Kreutz group comet.
1430  548  969

--Wentao Xu
May 20 2006 11:07:09 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Further to my post of...
Images: C2    (0,0) Upper Left.
1024x1024 images.
20060520     10:13:46
Kreutz group comet.
1454  555  952

--Wentao Xu

Measurement: 

picture size: 1024 * 1024

picture name          position
20060520_1331_c2.gif (532,1008)
20060520_1354_c2.gif (539,994)
20060520_1406_c2.gif (542,986)
20060520_1430_c2.gif (548,969)
20060520_1454_c2.gif (555,952)
20060520_1506_c2.gif (559,944)
20060520_1530_c2.gif (567,926)
20060520_1554_c2.gif (573,908)
20060520_1606_c2.gif (578,898)
20060520_1630_c2.gif (584,879)
20060520_1654_c2.gif (591,860)

My first discovery: 

Nov 19 2005 06:32:59 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Potential comet:
Images: C3    (0,0) Upper Left.
1024x1024 images.
20051119
   Kreutz group comet.
1023  601  788
1044  600  785
1118  598  780

--Wentao Xu
Nov 19 2005 07:05:40 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Further to my post of...
Images: C3    (0,0) Upper Left.
1024x1024 images.
20051119     06:32:5
Kreutz group comet.
1142  595  777

--Wentao Xu
Nov 19 2005 07:57:25 Wentao Xu
wentaopachacoti[at]yahoo.com.cn		 
Further to my post of...
Images: C3    (0,0) Upper Left.
1024x1024 images.
20051119     06:32:59
Kreutz group comet.
1218  592  772

--Wentao Xu

Measurement: 

C3

picture size: 1024 * 1024

picture name          position
20051119_1023_c3.gif (601,788)
20051119_1044_c3.gif (600,785)
20051119_1118_c3.gif (597,780)
20051119_1142_c3.gif (595,777)
20051119_1218_c3.gif (592,771)
20051119_1342_c3.gif (586,760)
20051119_1418_c3.gif (583,754)
20051119_1442_c3.gif (581,751)
20051119_1518_c3.gif (579,746)
20051119_1542_c3.gif (576,742)
20051119_1618_c3.gif (574,737)
20051119_1642_c3.gif (572,734)
20051119_1718_c3.gif (569,728)
20051119_1742_c3.gif (567,725)
20051119_1842_c3.gif (563,716)
20051119_1942_c3.gif (558,707)
20051119_2018_c3.gif (556,702)
20051119_2042_c3.gif (554,698)
20051119_2118_c3.gif (551,692)
20051119_2142_c3.gif (549,689)
20051119_2218_c3.gif (547,683)
20051119_2318_c3.gif (542,674)
20051119_2342_c3.gif (540,670)
20051120_0018_c3.gif (538,664)
20051120_0042_c3.gif (536,661)
20051120_0142_c3.gif (532,651)
20051120_0218_c3.gif (529,645)
20051120_0242_c3.gif (527,641)
20051120_0318_c3.gif (525,635)
20051120_0342_c3.gif (523,631)
20051120_0418_c3.gif (520,625)
20051120_0518_c3.gif (516,615)
20051120_0542_c3.gif (514,610)
20051120_0618_c3.gif (512,604)
20051120_0642_c3.gif (510,600)
20051120_0742_c3.gif (506,589)
20051120_0818_c3.gif (503,582)
20051120_0842_c3.gif (502,578)
20051120_0918_c3.gif (499,571)

C2: 

picture size: 1024 * 1024

picture name          position
20051120_0654_c2.gif (458,1021)
20051120_0731_c2.gif (446,989)
20051120_0754_c2.gif (439,970)
20051120_0806_c2.gif (435,959)
20051120_0830_c2.gif (428,938)
20051120_0854_c2.gif (421,916)
20051120_0906_c2.gif (417,905)
20051120_0930_c2.gif (410,883)
20051120_0954_c2.gif (403,860)
20051120_1034_c2.gif (392,821)
20051120_1056_c2.gif (385,797)
20051120_1106_c2.gif (382,790)
20051120_1130_c2.gif (376,771)
20051120_1154_c2.gif (368,746)
20051120_1206_c2.gif (363,734)

　

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Last update: May 27, 2007

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