MPEC 2005-E87 : COMETS C/2005 E3, 2005 E4 (SOHO)
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M.P.E.C. 2005-E87 Issued 2005 Mar. 15, 18:28 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets and routine data on comets. They are published
on behalf of Commission 20 of the International Astronomical Union by the
Minor Planet Center, Smithsonian Astrophysical Observatory,
Cambridge, MA 02138, U.S.A.
Supported in part by the Brinson Foundation
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html ISSN 1523-6714
COMETS C/2005 E3, 2005 E4 (SOHO)
Observations:
CK05E030 2S2005 03 06.67090 23 16 53.2 -06 08 32 EE087249
CK05E030 2s2005 03 06.67090 2 +0.01101599 -0.00061112 -0.00117436 EE087249
CK05E030 2S2005 03 06.68756 23 16 31.7 -06 06 22 EE087249
CK05E030 2s2005 03 06.68756 2 +0.01101629 -0.00061027 -0.00117417 EE087249
CK05E030 2S2005 03 06.70423 23 16 07.5 -06 03 46 EE087249
CK05E030 2s2005 03 06.70423 2 +0.01101660 -0.00060942 -0.00117398 EE087249
CK05E030 2S2005 03 06.71256 23 16 00.0 -06 02 27 EE087249
CK05E030 2s2005 03 06.71256 2 +0.01101675 -0.00060900 -0.00117389 EE087249
CK05E030 2S2005 03 06.72923 23 15 35.4 -06 00 30 EE087249
CK05E030 2s2005 03 06.72923 2 +0.01101705 -0.00060815 -0.00117370 EE087249
CK05E040 3S2005 03 10.38756 23 33 00.4 -02 48 05 EE087249
CK05E040 3s2005 03 10.38756 2 +0.01107014 -0.00042497 -0.00112664 EE087249
CK05E040 3S2005 03 10.40425 23 33 00.6 -02 46 52 EE087249
CK05E040 3s2005 03 10.40425 2 +0.01107031 -0.00042415 -0.00112640 EE087249
CK05E040 3S2005 03 10.44592 23 32 43.5 -02 39 39 EE087249
CK05E040 3s2005 03 10.44592 2 +0.01107073 -0.00042212 -0.00112581 EE087249
CK05E040 3S2005 03 10.48756 23 32 25.7 -02 35 02 EE087249
CK05E040 3s2005 03 10.48756 2 +0.01107115 -0.00042009 -0.00112521 EE087249
CK05E040 3S2005 03 10.51258 23 32 12.3 -02 30 49 EE087249
CK05E040 3s2005 03 10.51258 2 +0.01107140 -0.00041887 -0.00112486 EE087249
CK05E040 3S2005 03 10.52923 23 32 07.1 -02 28 22 EE087249
CK05E040 3s2005 03 10.52923 2 +0.01107157 -0.00041806 -0.00112462 EE087249
CK05E040 3S2005 03 10.57090 23 31 42.3 -02 24 38 EE087249
CK05E040 3s2005 03 10.57090 2 +0.01107198 -0.00041603 -0.00112402 EE087249
CK05E040 3S2005 03 10.61256 23 31 16.9 -02 19 05 EE087249
CK05E040 3s2005 03 10.61256 2 +0.01107239 -0.00041400 -0.00112342 EE087249
CK05E040 3S2005 03 10.67923 23 30 34.5 -02 12 19 EE087249
CK05E040 3s2005 03 10.67923 2 +0.01107303 -0.00041076 -0.00112246 EE087249
CK05E040 3S2005 03 10.69590 23 30 21.5 -02 11 04 EE087249
CK05E040 3s2005 03 10.69590 2 +0.01107319 -0.00040995 -0.00112222 EE087249
CK05E040 3S2005 03 10.72090 23 29 59.9 -02 09 29 EE087249
CK05E040 3s2005 03 10.72090 2 +0.01107343 -0.00040874 -0.00112186 EE087249
CK05E040 3S2005 03 10.73756 23 29 48.6 -02 07 36 EE087249
CK05E040 3s2005 03 10.73756 2 +0.01107359 -0.00040793 -0.00112162 EE087249
CK05E040 3S2005 03 10.76256 23 29 27.6 -02 05 28 EE087249
CK05E040 3s2005 03 10.76256 2 +0.01107383 -0.00040672 -0.00112126 EE087249
CK05E040 3S2005 03 10.84590 23 28 18.4 -02 00 56 EE087249
CK05E040 3s2005 03 10.84590 2 +0.01107460 -0.00040269 -0.00112005 EE087249
CK05E040 2S2005 03 10.85423 23 28 13.2 -02 00 03 EE087249
CK05E040 2s2005 03 10.85423 2 +0.01107467 -0.00040228 -0.00111993 EE087249
CK05E040 3S2005 03 10.86256 23 28 04.4 -01 59 17 EE087249
CK05E040 3s2005 03 10.86256 2 +0.01107475 -0.00040188 -0.00111981 EE087249
CK05E040 2S2005 03 10.89593 23 27 36.4 -01 58 15 EE087249
CK05E040 2s2005 03 10.89593 2 +0.01107506 -0.00040027 -0.00111933 EE087249
CK05E040 3S2005 03 10.90423 23 27 24.9 -01 57 48 EE087249
CK05E040 3s2005 03 10.90423 2 +0.01107513 -0.00039987 -0.00111921 EE087249
CK05E040 2S2005 03 10.91256 23 27 21.7 -01 57 25 EE087249
CK05E040 2s2005 03 10.91256 2 +0.01107521 -0.00039946 -0.00111909 EE087249
CK05E040 2S2005 03 10.92090 23 27 13.6 -01 57 19 EE087249
CK05E040 2s2005 03 10.92090 2 +0.01107528 -0.00039906 -0.00111897 EE087249
CK05E040 2S2005 03 10.93756 23 26 58.7 -01 56 34 EE087249
CK05E040 2s2005 03 10.93756 2 +0.01107543 -0.00039826 -0.00111872 EE087249
CK05E040 3S2005 03 10.97099 23 26 25.4 -01 55 40 EE087249
CK05E040 3s2005 03 10.97099 2 +0.01107573 -0.00039664 -0.00111824 EE087249
CK05E040 2S2005 03 10.97923 23 26 20.4 -01 55 14 EE087249
CK05E040 2s2005 03 10.97923 2 +0.01107580 -0.00039625 -0.00111812 EE087249
CK05E040 3S2005 03 10.98784 23 26 08.2 -01 54 38 EE087249
CK05E040 3s2005 03 10.98784 2 +0.01107588 -0.00039583 -0.00111799 EE087249
CK05E040 2S2005 03 10.99606 23 26 02.1 -01 54 03 EE087249
CK05E040 2s2005 03 10.99606 2 +0.01107595 -0.00039543 -0.00111787 EE087249
CK05E040 2S2005 03 11.00423 23 25 54.5 -01 54 17 EE087249
CK05E040 2s2005 03 11.00423 2 +0.01107602 -0.00039504 -0.00111775 EE087249
CK05E040 3S2005 03 11.01256 23 25 44.4 -01 53 34 EE087249
CK05E040 3s2005 03 11.01256 2 +0.01107609 -0.00039464 -0.00111763 EE087249
CK05E040 2S2005 03 11.02090 23 25 40.9 -01 54 08 EE087249
CK05E040 2s2005 03 11.02090 2 +0.01107617 -0.00039424 -0.00111751 EE087249
CK05E040 2S2005 03 11.03756 23 25 22.2 -01 53 35 EE087249
CK05E040 2s2005 03 11.03756 2 +0.01107631 -0.00039344 -0.00111727 EE087249
Observer details:
249 SOHO. SOHO-LASCO coronagraphs C2 and C3 (indicated with a 2 or 3 in the
column preceding S and s in the observation tabulation above). Comet
detections by M. Oates and R. Kracht, measurements by K. Battams,
reductions by B. G. Marsden.
Orbital elements:
Comet T q e Peri. Node Incl. C
CK05E030 2005 Mar. 6.96 0.0050 1.0 77.96 343.12 140.29 X
CK05E040 2005 Mar. 10.54 0.0487 1.0 22.24 80.60 26.43 X
Despite the parabolic orbit solutions, it seems quite likely that
C/2005 E4 is identical with C/1999 N5 (cf. MPEC 2002-F03). The following
represents a tentative linkage of just the C2 observations (which in the
case of C/1999 N5 are those made on July 11.56347 UT and earlier):
Epoch 1999 July 1.0 TT = JDT 2451360.5
T 1999 July 11.19521 TT MPC
q 0.0491937 (2000.0) P Q
n 0.17411674 Peri. 22.16838 -0.20140981 -0.87343833
a 3.1762087 Node 81.77546 +0.81796785 -0.39896927
e 0.9845118 Incl. 26.61126 +0.53885313 +0.27915768
P 5.66
Epoch 2005 Mar. 11.0 TT = JDT 2453440.5
T 2005 Mar. 10.54631 TT MPC
q 0.0491710 (2000.0) P Q
n 0.17406204 Peri. 22.27621 -0.20088010 -0.87458257
a 3.1768741 Node 81.62555 +0.81802940 -0.39760714
e 0.9845222 Incl. 26.49143 +0.53895740 +0.27751377
P 5.66
Residuals in seconds of arc
J997A 249 2.6+ 3.7- Y J997B 249 1.8+ 2.4- Y J997B 249 2.1+ 3.1+ Y
J997A 249 4.6+ 4.0- Y J997B 249 4.7- 1.9+ Y K053A 249 11.4- 9.1+ Y
J997A 249 3.5- 0.3+ Y J997B 249 0.6+ 2.3- Y K053A 249 3.9- 3.0- Y
J997B 249(13.8+ 5.7+)Y J997B 249 2.4+ 0.8+ Y K053A 249 2.4+ 4.7+ Y
J997B 249 1.6+ 1.1- Y J997B 249 0.3+ 3.8+ Y K053A 249 4.6- 9.3- Y
J997B 249 5.2+ 1.2- Y J997B 249 0.7- 0.9+ Y K053A 249 1.9+ 2.0- Y
J997B 249 2.3- 0.7- Y J997B 249 1.3+ 4.6+ Y K053A 249 9.2+ 3.7- Y
J997B 249 1.4- 3.1+ Y J997B 249 2.4+ 0.7- Y K053A 249(28.0- 39.3+)Y
J997B 249 2.6- 2.5+ Y J997B 249 3.0+ 1.1- Y K053B 249(26.4- 12.7+)Y
J997B 249 3.9- 1.9+ Y J997B 249 0.2+ 1.4+ Y K053B 249 6.0+ 2.1- Y
J997B 249 0.6- 0.7+ Y J997B 249 3.1- 0.6- Y K053B 249(37.2- 9.7+)Y
J997B 249 3.3- 4.9+ Y J997B 249 1.4+ 0.7+ Y
J997B 249 2.0- 0.4+ Y J997B 249 4.0+ 2.1- Y
In support of the proposed identification, as well as of the proposed
identification C/1999 J6 = 2004 V9 (cf. MPEC 2004-X73), the respective
orbits have been run back one further revolution (to Epoch 1993 Nov. 29.0 TT).
The tabulation below shows in particular the remarkable agreement of the
perihelion times T (as well as of the perihelion distances q). Indeed,
this circumstance shows, not only that C/1999 J6 and C/1999 N5 probably
separated from each other around that perihelion passage (the remaining slight
discordances being understandable on account of the poor quality of even
the C2 observations), but also that the splitting scenario discussed here and
on MPEC 2004-X73 is in fact likely to be essentially correct. The comets
passed 1.3-1.4 AU from Jupiter in May 1996.
Orbital elements:
Comet T q e Peri. Node Incl. C
CJ99J060 1993 Nov. 22.66 0.0515 0.9834 21.01 83.36 28.34 X
CJ99N050 1993 Nov. 20.98 0.0515 0.9838 21.17 83.10 28.10 X
Three further faint members of this related group of comets (C/1999 P6,
C/1999 P8, C/1999 P9: cf. MPEC 2002-F43) were observed during 1999 Aug. 5-15;
and C/1999 U2 (MPEC 1999-U29), one of the brighter original prototypes (with
C/1999 J6, cf. MPEC 2002-C28), was observed on 1999 Oct. 25. Although neither
the chance of survival nor the specific manner in which these members evolved
from the original parent body is known, it seems likely that C/1999 U2, at
least, will be reobserved on its next return to perihelion, presumably during
the next few months. If this comet indeed separated from C/1999 J6 and
C/1999 N5 near perihelion around 1993 Nov. 20-22, it should have a period
(now) of 5.95 years (i.e., near 2:1 mean-motion resonance with Jupiter) and
return to perihelion within a few days of 2005 Oct. 8.
Brian G. Marsden (C) Copyright 2005 MPC M.P.E.C. 2005-E87
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