Orbital Computation
Kreutz Group Comet
SOHO-1990
in
HI1A & HI1B Images
The bright Kreutz group sungrazer is
discovered by Michal Kusiak from Poland on 2010 Dec 19 in realtime C3 images.
 |
Comet SOHO-1990 in HI1a
Images
Animation from 2010/12/18 00:09 UTC -
2010/12/20 11:29 UTC
normally
each sequence 40 min apart;
original size and cropped;
processed by M.-T. Hui;
Courtesy of STEREO/SECCHI
Note: During the time span, there are at least
four other known Kreutz group comets visible in the animation pior to
SOHO-1990, which is the brightest one amidst. In order of departing the FOV,
they are SOHO-1989, SOHO-1992, SOHO-1993, and SOHO-1994. My SOHO-1991 seems
to get lost. |
 |
Comet SOHO-1990 in HI1b
Images
Animation from 2010/12/18 22:09 UTC -
2010/12/20 06:49 UTC
normally
each sequence 40 min apart;
original size and cropped;
processed by M.-T. Hui;
Courtesy of STEREO/SECCHI |
I managed to do astrometry of this comet in
HI1A data. Here comes my result. Note that the spacecraft vectors for
corresponding observations have been added manually; the values were given by JPL
Horizons.
Observations of SOHO-1990: computed with Astrometrica
- NET UCAC-2
SMK1990 4S2010 12 18.42987 00 15 39.65 -05 26 23.0
C49
SMK1990 4s2010 12 18.42987 2 -1.01982175
-0.76936943 -0.33509167 C49
SMK1990 4S2010 12 18.45765 00 15 23.02 -05 23 25.3
C49
SMK1990 4s2010 12 18.45765 2 -1.01940694
-0.76983731 -0.33529369 C49
SMK1990 4S2010 12 18.48543 00 15 07.42 -05 22 04.2
C49
SMK1990 4s2010 12 18.48543 2 -1.01899187
-0.77030502 -0.33549562 C49
SMK1990 4S2010 12 18.51321 00 14 54.93 -05 20 24.6
C49
SMK1990 4s2010 12 18.51321 2 -1.01857655
-0.77077254 -0.33569747 C49
SMK1990 4S2010 12 18.54098 00 14 41.47 -05 18 24.4
C49
SMK1990 4s2010 12 18.54098 2 -1.01816097
-0.77123988 -0.33589925 C49
SMK1990 4S2010 12 18.56876 00 14 27.75 -05 17 15.9
C49
SMK1990 4s2010 12 18.56876 2 -1.01774513 -0.77170704
-0.33610094 C49
SMK1990 4S2010 12 18.59654 00 14 18.04 -05 15 24.1
C49
SMK1990 4s2010 12 18.59654 2 -1.01732904
-0.77217402 -0.33630256 C49
SMK1990 4S2010 12 18.67987 00 13 26.02 -05 09 52.1
C49
SMK1990 4s2010 12 18.67987 2 -1.01607923
-0.77357385 -0.33690693 C49
SMK1990 4S2010 12 18.70765 00 13 17.35 -05 07 41.3
C49
SMK1990 4s2010 12 18.70765 2 -1.01566211
-0.77404010 -0.33710823 C49
SMK1990 4S2010 12 18.73543 00 12 59.44 -05 06 20.4
C49
SMK1990 4s2010 12 18.73543 2 -1.01524474
-0.77450616 -0.33730945 C49
SMK1990 4S2010 12 18.73601 11 13 55.19 -01 18
30.8
C50
SMK1990 4s2010 12 18.73601 2 +1.00669974
-0.93094152 -0.40136077 C50
SMK1990 4S2010 12 18.79098 00 12 28.27 -05 02 49.2
C49
SMK1990 4s2010 12 18.79098 2 -1.01440923
-0.77543774 -0.33771164 C49
SMK1990 4S2010 12 18.81876 00 12 12.76 -05 02 14.0
C49
SMK1990 4s2010 12 18.81876 2 -1.01399109 -0.77590325
-0.33791262 C49
SMK1990 4S2010 12 18.84712 11 15 23.04 -01 16
54.7
C50
SMK1990 4s2010 12 18.84712 2 +1.00862745
-0.92936331 -0.40066724 C50
SMK1990 4S2010 12 18.87432 00 11 39.25 -04 58 15.8
C49
SMK1990 4s2010 12 18.87432 2 -1.01315404 -0.77683373
-0.33831434 C49
SMK1990 4S2010 12 18.90209 00 11 24.30 -04 56 07.0
C49
SMK1990 4s2010 12 18.90209 2 -1.01273513
-0.77729870 -0.33851508 C49
SMK1990 4S2010 12 18.90268 11 16 20.42 -01 16
32.3
C50
SMK1990 4s2010 12 18.90268 2 +1.00959018
-0.92857288 -0.40031991 C50
SMK1990 4S2010 12 18.92987 00 11 03.79 -04 54 41.8
C49
SMK1990 4s2010 12 18.92987 2 -1.01231597 -0.77776348
-0.33871574 C49
SMK1990 4S2010 12 18.93045 11 16 45.67 -01 15
49.3
C50
SMK1990 4s2010 12 18.93045 2 +1.01007127
-0.92817734 -0.40014610 C50
SMK1990 4S2010 12 18.95765 00 10 51.82 -04 51 51.9
C49
SMK1990 4s2010 12 18.95765 2 -1.01189655
-0.77822807 -0.33891632 C49
SMK1990 4S2010 12 18.98543 00 10 39.03 -04 49 53.1
C49
SMK1990 4s2010 12 18.98543 2 -1.01147688
-0.77869248 -0.33911682 C49
SMK1990 4S2010 12 18.98601 11 17 36.45 -01 15
04.9
C50
SMK1990 4s2010 12 18.98601 2 +1.01103287
-0.92738559 -0.39979820 C50
SMK1990 4S2010 12 19.01379 11 18 00.04 -01 14
32.6
C50
SMK1990 4s2010 12 19.01379 2 +1.01151339
-0.92698939 -0.39962411 C50
SMK1990 4S2010 12 19.04098 00 10 10.18 -04 47 41.1
C49
SMK1990 4s2010 12 19.04098 2 -1.01063677 -0.77962076
-0.33951758 C49
SMK1990 4S2010 12 19.04157 11 18 29.81 -01 14
12.3
C50
SMK1990 4s2010 12 19.04157 2 +1.01199372
-0.92659296 -0.39944992 C50
SMK1990 4S2010 12 19.06876 00 09 51.45 -04 45 34.5
C49
SMK1990 4s2010 12 19.06876 2 -1.01021634
-0.78008462 -0.33971784 C49
SMK1990 4S2010 12 19.06934 11 18 56.59 -01 13
14.3
C50
SMK1990 4s2010 12 19.06934 2 +1.01247386
-0.92619632 -0.39927563 C50
SMK1990 4S2010 12 19.09654 00 09 32.80 -04 43 20.0
C49
SMK1990 4s2010 12 19.09654 2 -1.00979564 -0.78054829
-0.33991802 C49
SMK1990 4S2010 12 19.09712 11 19 21.12 -01 12
30.2
C50
SMK1990 4s2010 12 19.09712 2 +1.01295382
-0.92579946 -0.39910126 C50
SMK1990 4S2010 12 19.12490 11 19 43.66 -01 12
20.5
C50
SMK1990 4s2010 12 19.12490 2 +1.01343358
-0.92540237 -0.39892678 C50
SMK1990 4S2010 12 19.15209 00 09 00.96 -04 39 23.7
C49
SMK1990 4s2010 12 19.15209 2 -1.00895350
-0.78147509 -0.34031814 C49
SMK1990 4S2010 12 19.15268 11 20 16.69 -01 12
05.0
C50
SMK1990 4s2010 12 19.15268 2 +1.01391316
-0.92500507 -0.39875222 C50
SMK1990 4S2010 12 19.17987 00 08 42.38 -04 37 34.8
C49
SMK1990 4s2010 12 19.17987 2 -1.00853204
-0.78193821 -0.34051808 C49
SMK1990 4S2010 12 19.18045 11 20 37.39 -01 11
31.9
C50
SMK1990 4s2010 12 19.18045 2 +1.01439255
-0.92460755 -0.39857755 C50
SMK1990 4S2010 12 19.20765 00 08 26.80 -04 35 39.5
C49
SMK1990 4s2010 12 19.20765 2 -1.00811033
-0.78240115 -0.34071793 C49
SMK1990 4S2010 12 19.20823 11 21 11.11 -01 10
50.9
C50
SMK1990 4s2010 12 19.20823 2 +1.01487174
-0.92420981 -0.39840280 C50
SMK1990 4S2010 12 19.23543 00 08 08.90 -04 34 01.8
C49
SMK1990 4s2010 12 19.23543 2 -1.00768837
-0.78286390 -0.34091771 C49
SMK1990 4S2010 12 19.23601 11 21 34.93 -01 10
43.2
C50
SMK1990 4s2010 12 19.23601 2 +1.01535075
-0.92381184 -0.39822795 C50
SMK1990 4S2010 12 19.26321 00 07 42.71 -04 32 40.8
C49
SMK1990 4s2010 12 19.26321 2 -1.00726615 -0.78332647
-0.34111741 C49
SMK1990 4S2010 12 19.26379 11 22 10.61 -01 09
31.8
C50
SMK1990 4s2010 12 19.26379 2 +1.01582957
-0.92341366 -0.39805300 C50
SMK1990 4S2010 12 19.29098 00 07 27.58 -04 30 12.2
C49
SMK1990 4s2010 12 19.29098 2 -1.00684368 -0.78378885
-0.34131703 C49
SMK1990 4S2010 12 19.29156 11 22 31.38 -01 09
22.3
C50
SMK1990 4s2010 12 19.29156 2 +1.01630820
-0.92301526 -0.39787796 C50
SMK1990 4S2010 12 19.31876 00 07 22.43 -04 28 32.0
C49
SMK1990 4s2010 12 19.31876 2 -1.00642095
-0.78425105 -0.34151656 C49
SMK1990 4S2010 12 19.31934 11 22 54.11 -01 09
01.6
C50
SMK1990 4s2010 12 19.31934 2 +1.01678664
-0.92261664 -0.39770282 C50
SMK1990 4S2010 12 19.34654 00 06 59.65 -04 26 39.0
C49
SMK1990 4s2010 12 19.34654 2 -1.00599797
-0.78471306 -0.34171602 C49
SMK1990 4S2010 12 19.34712 11 23 23.11 -01 08
32.5
C50
SMK1990 4s2010 12 19.34712 2 +1.01726490
-0.92221781 -0.39752759 C50
SMK1990 4S2010 12 19.37432 00 06 43.20 -04 24 58.3
C49
SMK1990 4s2010 12 19.37432 2 -1.00557474
-0.78517488 -0.34191539 C49
SMK1990 4S2010 12 19.37490 11 23 49.96 -01 08
10.5
C50
SMK1990 4s2010 12 19.37490 2 +1.01774296
-0.92181875 -0.39735227 C50
SMK1990 4S2010 12 19.40209 00 06 23.46 -04 22 53.0
C49
SMK1990 4s2010 12 19.40209 2 -1.00515125
-0.78563652 -0.34211468 C49
SMK1990 4S2010 12 19.42987 00 06 06.13 -04 21 03.2
C49
SMK1990 4s2010 12 19.42987 2 -1.00472751
-0.78609798 -0.34231390 C49
SMK1990 4S2010 12 19.43045 11 24 47.78 -01 06
33.2
C50
SMK1990 4s2010 12 19.43045 2 +1.01869851
-0.92101998 -0.39700134 C50
SMK1990 4S2010 12 19.45765 00 05 48.71 -04 19 01.5
C49
SMK1990 4s2010 12 19.45765 2 -1.00430351
-0.78655925 -0.34251303 C49
SMK1990 4S2010 12 19.45823 11 25 14.26 -01 06
17.7
C50
SMK1990 4s2010 12 19.45823 2 +1.01917600
-0.92062026 -0.39682573 C50
SMK1990 4S2010 12 19.48543 00 05 28.62 -04 17 17.0
C49
SMK1990 4s2010 12 19.48543 2 -1.00387926
-0.78702033 -0.34271208 C49
SMK1990 4S2010 12 19.48601 11 25 42.59 -01 05
44.5
C50
SMK1990 4s2010 12 19.48601 2 +1.01965331
-0.92022033 -0.39665003 C50
SMK1990 4S2010 12 19.51321 00 05 11.75 -04 15 12.6
C49
SMK1990 4s2010 12 19.51321 2 -1.00345476
-0.78748123 -0.34291105 C49
SMK1990 4S2010 12 19.51379 11 26 07.43 -01 05
16.5
C50
SMK1990 4s2010 12 19.51379 2 +1.02013042
-0.91982018 -0.39647423 C50
SMK1990 4S2010 12 19.54098 00 04 51.05 -04 13 16.2
C49
SMK1990 4s2010 12 19.54098 2 -1.00303001
-0.78794194 -0.34310994 C49
SMK1990 4S2010 12 19.54156 11 26 40.30 -01 04
50.1
C50
SMK1990 4s2010 12 19.54156 2 +1.02060734
-0.91941981 -0.39629834 C50
SMK1990 4S2010 12 19.56876 00 04 34.90 -04 11 09.6
C49
SMK1990 4s2010 12 19.56876 2 -1.00260500
-0.78840246 -0.34330874 C49
SMK1990 4S2010 12 19.56934 11 27 07.08 -01 04
03.0
C50
SMK1990 4s2010 12 19.56934 2 +1.02108407
-0.91901922 -0.39612236 C50
SMK1990 4S2010 12 19.59654 00 04 15.13 -04 09 24.4
C49
SMK1990 4s2010 12 19.59654 2 -1.00217974
-0.78886280 -0.34350747 C49
SMK1990 4S2010 12 19.59712 11 27 35.82 -01 03
30.9
C50
SMK1990 4s2010 12 19.59712 2 +1.02156061
-0.91861842 -0.39594628 C50
SMK1990 4S2010 12 19.62432 00 03 56.27 -04 07 28.3
C49
SMK1990 4s2010 12 19.62432 2 -1.00175422
-0.78932295 -0.34370612 C49
SMK1990 4S2010 12 19.62490 11 28 05.00 -01 02
58.4
C50
SMK1990 4s2010 12 19.62490 2 +1.02203696
-0.91821739 -0.39577011 C50
SMK1990 4S2010 12 19.65209 00 03 38.10 -04 05 32.3
C49
SMK1990 4s2010 12 19.65209 2 -1.00132845
-0.78978292 -0.34390468 C49
SMK1990 4S2010 12 19.65267 11 28 33.76 -01 02
21.2
C50
SMK1990 4s2010 12 19.65267 2 +1.02251312
-0.91781615 -0.39559384 C50
SMK1990 4S2010 12 19.67987 00 03 17.63 -04 03 33.9
C49
SMK1990 4s2010 12 19.67987 2 -1.00090243
-0.79024269 -0.34410316 C49
SMK1990 4S2010 12 19.70765 00 02 58.22 -04 01 37.0
C49
SMK1990 4s2010 12 19.70765 2 -1.00047616
-0.79070229 -0.34430156 C49
SMK1990 4S2010 12 19.73543 00 02 39.13 -03 59 44.2
C49
SMK1990 4s2010 12 19.73543 2 -1.00004964
-0.79116169 -0.34449988 C49
SMK1990 4S2010 12 19.73601 11 30 02.09 -01 00
31.3
C50
SMK1990 4s2010 12 19.73601 2 +1.02394045
-0.91661111 -0.39506448 C50
SMK1990 4S2010 12 19.76321 00 02 19.27 -03 57 44.8
C49
SMK1990 4s2010 12 19.76321 2 -0.99962286
-0.79162091 -0.34469812 C49
SMK1990 4S2010 12 19.76379 11 30 30.82 -00 59
56.9
C50
SMK1990 4s2010 12 19.76379 2 +1.02441584
-0.91620900 -0.39488783 C50
SMK1990 4S2010 12 19.79098 00 01 59.59 -03 55 38.4
C49
SMK1990 4s2010 12 19.79098 2 -0.99919583
-0.79207994 -0.34489628 C49
SMK1990 4S2010 12 19.79156 11 31 00.65 -00 59
20.0
C50
SMK1990 4s2010 12 19.79156 2 +1.02489104
-0.91580666 -0.39471110 C50
SMK1990 4S2010 12 19.81876 00 01 39.21 -03 53 36.5
C49
SMK1990 4s2010 12 19.81876 2 -0.99876854
-0.79253878 -0.34509436 C49
SMK1990 4S2010 12 19.81934 11 31 30.51 -00 58
43.6
C50
SMK1990 4s2010 12 19.81934 2 +1.02536605
-0.91540411 -0.39453427 C50
SMK1990 4S2010 12 19.84654 00 01 19.06 -03 51 34.3
C49
SMK1990 4s2010 12 19.84654 2 -0.99834101
-0.79299743 -0.34529235 C49
SMK1990 4S2010 12 19.84712 11 32 01.75 -00 57
59.2
C50
SMK1990 4s2010 12 19.84712 2 +1.02584087
-0.91500134 -0.39435734 C50
SMK1990 4S2010 12 19.87432 00 00 58.78 -03 49 34.2
C49
SMK1990 4s2010 12 19.87432 2 -0.99791322
-0.79345590 -0.34549026 C49
SMK1990 4S2010 12 19.87490 11 32 31.80 -00 57
21.8
C50
SMK1990 4s2010 12 19.87490 2 +1.02631550
-0.91459836 -0.39418032 C50
SMK1990 4S2010 12 19.90209 00 00 37.67 -03 47 34.8
C49
SMK1990 4s2010 12 19.90209 2 -0.99748518
-0.79391418 -0.34568809 C49
SMK1990 4S2010 12 19.90267 11 33 03.04 -00 56
41.3
C50
SMK1990 4s2010 12 19.90267 2 +1.02678993
-0.91419515 -0.39400321 C50
SMK1990 4S2010 12 19.92987 00 00 17.07 -03 45 30.7
C49
SMK1990 4s2010 12 19.92987 2 -0.99705689
-0.79437227 -0.34588584 C49
SMK1990 4S2010 12 19.93045 11 33 34.14 -00 56
02.6
C50
SMK1990 4s2010 12 19.93045 2 +1.02726418
-0.91379173 -0.39382600 C50
SMK1990 4S2010 12 19.95765 23 59 55.40 -03 43 23.4
C49
SMK1990 4s2010 12 19.95765 2 -0.99662835
-0.79483018 -0.34608351 C49
SMK1990 4S2010 12 19.95823 11 34 04.48 -00 55
21.1
C50
SMK1990 4s2010 12 19.95823 2 +1.02773823
-0.91338809 -0.39364871 C50
SMK1990 4S2010 12 19.98543 23 59 34.14 -03 41 23.3
C49
SMK1990 4s2010 12 19.98543 2 -0.99619955
-0.79528790 -0.34628110 C49
SMK1990 4S2010 12 19.98601 11 34 36.27 -00 54
35.8
C50
SMK1990 4s2010 12 19.98601 2 +1.02821209
-0.91298424 -0.39347131 C50
SMK1990 4S2010 12 20.01321 23 59 12.73 -03 39 14.8
C49
SMK1990 4s2010 12 20.01321 2 -0.99577051
-0.79574542 -0.34647860 C49
SMK1990 4S2010 12 20.01378 11 35 07.96 -00 53
52.4
C50
SMK1990 4s2010 12 20.01378 2 +1.02868575
-0.91258016 -0.39329382 C50
SMK1990 4S2010 12 20.04098 23 58 49.26 -03 37 00.3
C49
SMK1990 4s2010 12 20.04098 2 -0.99534121
-0.79620276 -0.34667602 C49
SMK1990 4S2010 12 20.04156 11 35 40.35 -00 53
09.6
C50
SMK1990 4s2010 12 20.04156 2 +1.02915923
-0.91217587 -0.39311624 C50
SMK1990 4S2010 12 20.06876 23 58 27.56 -03 35 26.7
C49
SMK1990 4s2010 12 20.06876 2 -0.99491166 -0.79665992
-0.34687336 C49
SMK1990 4S2010 12 20.06934 11 36 12.70 -00 52
23.5
C50
SMK1990 4s2010 12 20.06934 2 +1.02963251
-0.91177137 -0.39293857 C50
SMK1990 4S2010 12 20.09654 23 58 05.33 -03 32 51.2
C49
SMK1990 4s2010 12 20.09654 2 -0.99448186
-0.79711688 -0.34707062 C49
SMK1990 4S2010 12 20.09712 11 36 43.87 -00 51
49.7
C50
SMK1990 4s2010 12 20.09712 2 +1.03010559
-0.91136664 -0.39276080 C50
SMK1990 4S2010 12 20.12432 23 57 43.95 -03 30 49.2
C49
SMK1990 4s2010 12 20.12432 2 -0.99405180
-0.79757365 -0.34726779 C49
SMK1990 4S2010 12 20.12490 11 37 16.59 -00 50
55.4
C50
SMK1990 4s2010 12 20.12490 2 +1.03057849
-0.91096170 -0.39258294 C50
SMK1990 4S2010 12 20.15209 23 57 19.24 -03 28 42.6
C49
SMK1990 4s2010 12 20.15209 2 -0.99362150
-0.79803024 -0.34746489 C49
SMK1990 4S2010 12 20.15267 11 37 51.57 -00 50
05.9
C50
SMK1990 4s2010 12 20.15267 2 +1.03105119
-0.91055654 -0.39240498 C50
SMK1990 4S2010 12 20.17987 23 56 56.12 -03 26 36.0
C49
SMK1990 4s2010 12 20.17987 2 -0.99319095
-0.79848664 -0.34766190 C49
SMK1990 4S2010 12 20.18045 11 38 24.97 -00 49
19.6
C50
SMK1990 4s2010 12 20.18045 2 +1.03152370
-0.91015117 -0.39222693 C50
SMK1990 4S2010 12 20.20765 23 56 32.42 -03 24 28.7
C49
SMK1990 4s2010 12 20.20765 2 -0.99276014
-0.79894285 -0.34785883 C49
SMK1990 4S2010 12 20.20823 11 38 57.55 -00 48
32.5
C50
SMK1990 4s2010 12 20.20823 2 +1.03199602
-0.90974558 -0.39204879 C50
SMK1990 4S2010 12 20.23543 23 56 08.25 -03 22 16.4
C49
SMK1990 4s2010 12 20.23543 2 -0.99232908
-0.79939886 -0.34805567 C49
SMK1990 4S2010 12 20.26321 23 55 44.09 -03 20 04.9
C49
SMK1990 4s2010 12 20.26321 2 -0.99189777
-0.79985470 -0.34825244 C49
SMK1990 4S2010 12 20.29098 23 55 18.36 -03 17 56.7
C49
SMK1990 4s2010 12 20.29098 2 -0.99146622
-0.80031034 -0.34844912 C49
SMK1990 4S2010 12 20.31876 23 54 53.64 -03 15 44.1
C49
SMK1990 4s2010 12 20.31876 2 -0.99103441
-0.80076579 -0.34864572 C49
SMK1990 4S2010 12 20.34654 23 54 26.86 -03 13 27.3
C49
SMK1990 4s2010 12 20.34654 2 -0.99060235
-0.80122105 -0.34884224 C49
Station data:
C49 STEREO-A. SECCHI HI1 imager. Comet detection by M. Kusiak, measurements
by M.-T. Hui, reductions by M.-T. Hui.
C50 STEREO-B. SECCHI HI1 imager. Comet detection by M. Kusiak, measurements
by M.-T. Hui, reductions by M.-T. Hui.
The light curve produced by Comets for Windows
with all the data above is displayed below. Note that the designation SMK1990 =
SOHO 1990. The former was the name I used to refer to the comet according to
the official confirmation worked by K. Battams. The red dots represent that
magnitudes was measured from HI1A images, while the blue ones represent
measurements from HI1B images, both in R band, with star catalog USNO-A 2.0
applied. We can see that the
magnitude diverses when its magnitude is fainter than 10m, which may be
construed as the spin of comet's core with anisotropic activities.
The green line represents the formula of
calculated magnitude observed from the earth, regardless of backward scattering
effect: m1 = 13.6 + 5 log d + 8.30 log r, where d is the distance from geocenter
to the comet, and r is again the distance from heliocenter to the comet (both in
AU). Please notice that the value of K, the slope parameter, is assumed to be
8.3 from historical observations of Kreutz sungrazers from ground-based.
I again attempted to compute back how bright the
comet is before the detection, so as to see if telescopes with large aperture will be able to capture some
potential well-behaved Kreutz group members on the ground. Judging from the result,
it seems that comet SOHO-1990 should have been detectable far before the
discovery by M. Kusiak. However, I think there is a great uncertainty
as now only one example is taken into consideration and analysed. It may be of
much interest if more sungrazers are analysed. Furthermore, observations of such
a short arc also contribute an unignorable uncertainty, leading to an unreliable
result that should be treated with enormous caution.
 |
|
 |
|
HI1A |
|
HI1B |
Note that MKSH01 =
SMK1990, both were the designations that I used to refer to the comet. The
measurements in HI1A were conducted prior to the official confirmation
released by K. Battams, thus the temporal name applied.
Gauss curve produced by
Astrometrica. The total PSF is using an aperture circle of
3 x
3 pixel around the brightest
pixel. We can see the
computed Gauss curve
in the right and the real pixels
distributing somewhat deviating from the
ideal line. The Fit RMS, which inlays
under the Gauss curve, is the deviation from the ideal line.
By feeding my measurements into FindOrb, I
obtained my best solution with a relatively small RMS.
Orbital elements:
SMK1990
Perihelion 2010 Dec 21.032562 TT; Constraint: e=1
Epoch 2010 Dec 19.0 TT = JDT 2455549.5 Earth MOID: 0.5702
q635343.128km (2000.0) P Q
Peri. 89.99325 0.15030412 -0.98274872
Node 10.65249 -0.96446924 -0.16971169
e 1.0 Incl. 144.33900 0.21727341 -0.07350426
From 95 observations 2010 Dec. 18-20; RMS error 37.538 arcseconds
Residuals in arcseconds:
101218 C49 7.0+ 27.8- 101219 C50 43.5+ 34.3- 101219 C50 29.6+ 30.1-
101218 C49 27.0- 46.6+ 101219 C49( 125- 12.4-) 101219 C49 .58+ 23.6+
101218 C49 44.5- 24.3+ 101219 C50( 176+ 7.1+) 101219 C50 24.5+ 32.7-
101218 C49 14.4- 20.3+ 101219 C49(94.4- 24.7+) 101219 C49 4.8+ 25.4+
101218 C49 2.2+ 36.6+ 101219 C50(82.1+ 13.8-) 101219 C50 36.8+ 27.9-
101218 C49 16.1+ 1.0+ 101219 C49(87.7+ 13.0+) 101219 C49 10.3+ 24.4+
101218 C49(91.1+ 8.5+) 101219 C50 15.8+ 23.9- 101219 C50 28.1+ 30.7-
101218 C49 18.6- 26.0+ 101219 C49 8.1+ 13.8+ 101219 C49 6.6+ 22.3+
101218 C49(76.8+ 51.5+) 101219 C50 41.4+ 25.9- 101219 C50 34.0+ 30.9-
101218 C49 35.5+ 26.9+ 101219 C49 25.2+ 1.9+ 101219 C49 14.1+ 24.1+
101218 C50(93.3+ 16.9-) 101219 C50 32.7+ 35.4- 101219 C50 34.1+ 33.6-
101218 C49 26.1+ 26.2+ 101219 C49 5.1- 14.2+ 101219 C49 9.1+ 28.6+
101218 C49 24.5+ 44.9- 101219 C49 2.9+ 10.6+ 101219 C50 19.3+ 34.2-
101218 C50(85.3- 20.2-) 101219 C50(70.5+ 2.3-) 101219 C49 13.9+ 25.1+
101218 C49 11.7- 20.2- 101219 C49 11.7+ 18.5+ 101219 C50 22.5+ 31.6-
101218 C49 .83- 1.5+ 101219 C50 49.4+ 19.6- 101220 C49 20.2+ 29.4+
101218 C50 17.5+ 49.2- 101219 C49 17.3- 8.8+ 101220 C50 20.6+ 31.5-
101218 C49(71.5- 20.7-) 101219 C50 53.8+ 19.5- 101220 C49 .44- 39.1+
101218 C50 15.0+ 32.4- 101219 C49 4.1+ 18.6+ 101220 C50 25.0+ 32.8-
101218 C49 13.2- 41.5+ 101219 C50 3.5+ 25.1- 101220 C49 9.6+ 7.1+
101218 C49 34.5+ 52.3+ 101219 C49 29.6- 20.0+ 101220 C50 24.8+ 31.5-
101218 C50 9.1+ 41.1- 101219 C50(71.3+ 32.7-) 101220 C49 16.1+ 36.3+
101219 C50 23.5- 35.9- 101219 C49 7.2+ 31.1+ 101220 C50 2.6+ 43.3-
101219 C49(85.2+ 32.6-) 101219 C50 45.2+ 20.1- 101220 C49 39.6+ 31.2+
101219 C50 34.9+ 42.9- 101219 C49 7.8- 20.4+ 101220 C50 .67- 35.4-
101219 C49 48.7+ 14.9- 101219 C50 45.9+ 22.9- 101220 C49 17.9+ 29.9+
101219 C50 46.7+ 12.5- 101219 C49 6.7- 20.1+ 101220 C50 25.5+ 33.0-
101219 C49 14.9+ 10.4+ 101219 C50 50.6+ 25.8- 101220 C49 24.8+ 27.8+
101219 C50 23.0+ 3.6+ 101219 C49 7.2+ 19.3+ 101220 C50 23.1+ 34.7-
101219 C50 32.5- 15.0- 101219 C50 46.5+ 24.4- 101220 C49 28.2+ 25.5+
101219 C49 33.9+ 27.4+ 101219 C49 10.7- 20.4+ 101220 C50 3.5+ 36.5-
101219 C50(67.6+ 28.2-) 101219 C49 9.9- 19.5+ 101220 C49 29.8+ 27.3+
101219 C49 6.1+ 26.1+ 101219 C49 1.7- 14.0+ 101220 C49 37.0+ 27.4+
101219 C50 19.1- 24.0- 101219 C50 48.0+ 25.1- 101220 C49 26.5+ 23.2+
101219 C49 25.0+ 30.9+ 101219 C49 2.1- 14.6+ 101220 C49 37.3+ 22.4+
101219 C50(87.4+ 12.3-) 101219 C50 32.0+ 28.6- 101220 C49 23.7+ 24.8+
101219 C49 10.9+ 17.8+ 101219 C49 2.9+ 21.6+
( ) -- Rejected Obs
Click here to search SkyMorph for this object
Based upon the orbital elements that I
acquired, I used Comet for Windows by Seiichi Yoshida to show the path that the
comet might have passed through in the midst of constellations. The comet might
have lurked in Monoceros in early October, and then speeds up in parallel with
the Galactic equator approximately and eventually plunges into the Sun in
Scorpius, as seen from the Earth. Were my calculation of the its lightcurve in
coincide with the fact before the discovery, ground-based observers from
southern hemisphere might once have been favored to be capable of discovering
it. Nevertheless, it is always very interesting to search for potential bright
Kreutz group comets along their path from ground-based, for I do believe that
another great daylight sungrazer, like comet C/1965 S1 (Ikeya-Seki), is now
moving towards the Sun and one day it will again become a great sight to behold
once in our lives. So I tend to encourage observers to pay attention to and keep
monitoring the areas that sungrazers of Kreutz group may pass through; however
the way is, visual hunt, or digital and robotic survey, both will be effective.
Copyright
©
Man-To Hui on
2011/02/14
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