MPEC 2023-J12 : COMET P/2018 HT3 (NEOWISE)
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M.P.E.C. 2023-J12 Issued 2023 May 3, 04:19 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets, routine data on comets and natural satellites,
and occasional editorial announcements. They are published
on behalf of Division F of the International Astronomical Union by the
Minor Planet Center, Smithsonian Astrophysical Observatory,
Cambridge, MA 02138, U.S.A.
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL https://www.minorplanetcenter.net/ ISSN 1523-6714
COMET P/2018 HT3 (NEOWISE)
R. Matson reported a discovery of a comet in ultraviolet SWAN images
during Apr. 5-16 UT, noting a diffuse 15" coma. M. Mattiazzo confirmed the
activity from roving position (E114.01, S21.88) observed on Apr. 18, noting
a tail at position angle 150 deg. Subsequently, the object was linked to
2018 HT3 by H. Sato, who noted a very condensed 30" coma and a broad 84" tail
at position angle 90-130 deg observed at iTelescope Deep Sky Chile (X07).
Additional reports of cometary features are as follows:
OC Date Reporter Coma Tail PA Exposures
I41 2012-11-06 S. Deen 3".5 14" 130-350
I47 2023-04-19 M. Masek 78" 30" 85-160 18x60s
L81 2023-04-20 M. Jaeger 60" 90" 105-145 2x100s
I47 2023-04-20 M. Masek 72" 48" 127
W88 2023-04-24 B. Lutkenhoner 9" 20x20s
I47 2023-04-24 M. Masek 60" 23x30s
M21 2023-04-25 A. Aletti 20" 60x30s
Q62 2023-04-27 M. Suzuki 44" 5x60s
I47 2023-04-30 M. Masek 48" 36" 36-159 38x30s
Observations:
PK18H03T C2012 09 06.61357402 26 54.101+62 10 10.22 22.41GVEJ012F51
PK18H03T C2012 09 06.62053902 26 54.876+62 10 23.40 22.23GVEJ012F51
PK18H03T C2012 10 06.63225605 16 13.508+81 26 16.13 20.84GVEJ012F51
PK18H03T C2012 10 06.63914805 16 21.928+81 26 31.28 20.25GVEJ012F51
PK18H03T ZC2012 11 06.50467213 28 53.34 +46 39 42.3 17.9 rWEJ012I41
PK18H03T ZC2012 11 06.53685013 28 58.03 +46 35 09.8 17.7 rWEJ012I41
PK18H03T C2013 06 18.51650719 25 19.008-24 44 58.10 21.29GVEJ012F51
PK18H03T C2013 06 18.54274219 25 16.170-24 44 54.12 21.72GVEJ012F51
PK18H03T* S2018 04 22.96098 20 46 25.56 -39 48 59.5 19 RLEJ012C51
PK18H03T s2018 04 22.96098 1 + 4107.3144 - 3530.9296 - 4216.4971 EJ012C51
PK18H03T S2018 04 23.22278 20 46 11.89 -39 48 15.4 LEJ012C51
PK18H03T s2018 04 23.22278 1 + 4114.1013 - 3507.7829 - 4229.1576 EJ012C51
PK18H03T S2018 04 23.28823 20 46 08.43 -39 48 03.5 LEJ012C51
PK18H03T s2018 04 23.28823 1 + 4115.7704 - 3501.9925 - 4232.3237 EJ012C51
PK18H03T S2018 04 23.35356 20 46 05.09 -39 47 52.7 LEJ012C51
PK18H03T s2018 04 23.35356 1 + 4164.9505 - 3518.3787 - 4170.1244 EJ012C51
PK18H03T S2018 04 23.41901 20 46 01.39 -39 47 42.4 LEJ012C51
PK18H03T s2018 04 23.41901 1 + 4166.6356 - 3512.5498 - 4173.3505 EJ012C51
PK18H03T S2018 04 23.48446 20 45 58.01 -39 47 31.4 LEJ012C51
PK18H03T s2018 04 23.48446 1 + 4168.3261 - 3506.7263 - 4176.5494 EJ012C51
PK18H03T S2018 04 23.54991 20 45 54.51 -39 47 20.9 LEJ012C51
PK18H03T s2018 04 23.54991 1 + 4168.1624 - 3499.9278 - 4181.9710 EJ012C51
PK18H03T S2018 04 23.68082 20 45 47.49 -39 47 00.6 LEJ012C51
PK18H03T s2018 04 23.68082 1 + 4171.4270 - 3488.2530 - 4188.4559 EJ012C51
PK18H03T S2018 04 23.81172 20 45 40.26 -39 46 36.5 LEJ012C51
PK18H03T s2018 04 23.81172 1 + 4174.6469 - 3476.5733 - 4194.9464 EJ012C51
PK18H03T |C2018 05 12.25385 20 19 02.62 -39 13 27.4 20.6 VuEJ012807
PK18H03T |C2018 05 12.25580 20 19 02.36 -39 13 27.2 20.5 VuEJ012807
PK18H03T |C2018 05 12.25933 20 19 01.91 -39 13 26.8 20.9 VuEJ012807
PK18H03T KC2018 05 15.61233220 11 55.541-39 08 00.43 20.84GVEJ012T12
PK18H03T |C2018 05 16.29310 20 10 24.30 -39 06 37.6 20.6 GUEJ012807
PK18H03T |C2018 05 16.29741 20 10 23.71 -39 06 37.3 20.6 GUEJ012807
PK18H03T |C2018 05 16.30233 20 10 23.04 -39 06 36.7 20.5 GUEJ012807
PK18H03T |C2018 06 07.31693 19 09 45.81 -37 26 06.1 21.0 GUEJ012807
PK18H03T |C2018 06 07.32122 19 09 45.03 -37 26 04.3 20.9 GUEJ012807
PK18H03T KC2018 06 07.61407 19 08 52.18 -37 23 38.4 20.4 GUEJ012474
PK18H03T KC2018 06 07.61618 19 08 51.79 -37 23 37.2 20.6 GUEJ012474
PK18H03T KC2018 06 07.61829 19 08 51.41 -37 23 36.2 20.3 GUEJ012474
PK18H03T KC2018 06 07.62041 19 08 51.03 -37 23 35.3 20.3 GUEJ012474
PK18H03T |C2018 06 08.42173 19 06 25.71 -37 16 53.6 20.6 GUEJ012807
PK18H03T |C2018 06 08.42477 19 06 25.14 -37 16 52.1 20.3 GUEJ012807
PK18H03T |C2018 06 08.42780 19 06 24.59 -37 16 50.4 20.3 GUEJ012807
PK18H03T KC2022 11 30.11936 21 37 52.62 +21 31 47.5 oEJ012291
PK18H03T KC2022 11 30.13506 21 37 53.18 +21 31 37.0 oEJ012291
PK18H03T KC2022 11 30.15098 21 37 53.85 +21 31 27.1 oEJ012291
PK18H03T V2023 04 18.48383 03 12 40.51 -20 23 21.8 14.6 VqEJ012247
PK18H03T v2023 04 18.48383 1 114.0100 -21.8800 10 EJ012247
PK18H03T V2023 04 18.48554 03 12 40.53 -20 23 28.7 15.0 VqEJ012247
PK18H03T v2023 04 18.48554 1 114.0100 -21.8800 10 EJ012247
PK18H03T V2023 04 18.48726 03 12 40.68 -20 23 38.6 15.0 VqEJ012247
PK18H03T v2023 04 18.48726 1 114.0100 -21.8800 10 EJ012247
PK18H03T V2023 04 18.49336 03 12 40.87 -20 24 10.5 14.9 VqEJ012247
PK18H03T v2023 04 18.49336 1 114.0100 -21.8800 10 EJ012247
PK18H03T V2023 04 18.49461 03 12 40.83 -20 24 19.0 14.7 VqEJ012247
PK18H03T v2023 04 18.49461 1 114.0100 -21.8800 10 EJ012247
PK18H03T V2023 04 18.49632 03 12 40.86 -20 24 23.8 14.7 VqEJ012247
PK18H03T v2023 04 18.49632 1 114.0100 -21.8800 10 EJ012247
PK18H03T KC2023 04 19.96802 03 13 33.04 -22 31 45.5 14.4 VqEJ012I47
PK18H03T KC2023 04 19.97304 03 13 33.16 -22 32 10.7 14.4 VqEJ012I47
PK18H03T KC2023 04 19.97684 03 13 33.28 -22 32 31.5 14.3 VqEJ012I47
PK18H03T 0C2023 04 20.00290 03 13 34.04 -22 34 48.1 VEJ012X07
PK18H03T 0C2023 04 20.00650 03 13 34.16 -22 35 07.5 VEJ012X07
PK18H03T 0C2023 04 20.01008 03 13 34.29 -22 35 25.0 14.7 GVEJ012X07
PK18H03T %C2023 04 20.74615 03 13 56.37 -23 39 52.7 15.4 GVEJ012L81
PK18H03T %C2023 04 20.74784 03 13 56.37 -23 40 01.2 15.4 GVEJ012L81
PK18H03T KC2023 04 20.97154 03 14 02.78 -23 59 38.9 14.6 VqEJ012I47
PK18H03T KC2023 04 20.97395 03 14 02.84 -23 59 52.3 14.4 VqEJ012I47
PK18H03T 3C2023 04 22.97486 03 14 50.136-26 57 42.70 16.1 GVEJ012W88
PK18H03T 3C2023 04 22.98328 03 14 50.282-26 58 27.52 16.7 GVEJ012W88
PK18H03T %C2023 04 23.96892 03 15 08.225-28 27 22.79 16.5 GVEJ012W88
PK18H03T %C2023 04 23.97688 03 15 08.350-28 28 05.77 16.5 GVEJ012W88
PK18H03T KC2023 04 24.96716 03 15 23.25 -29 58 18.4 14.6 VqEJ012I47
PK18H03T 3C2023 04 24.97145 03 15 23.266-29 58 43.00 16.6 GVEJ012W88
PK18H03T KC2023 04 24.97284 03 15 23.26 -29 58 48.3 14.5 VqEJ012I47
PK18H03T 3C2023 04 24.97986 03 15 23.328-29 59 28.75 16.3 GVEJ012W88
PK18H03T KC2023 04 25.73477 03 15 32.64 -31 08 57.3 VEJ012M21
PK18H03T KC2023 04 25.74212 03 15 32.63 -31 09 36.5 VEJ012M21
PK18H03T KC2023 04 25.74756 03 15 32.80 -31 10 07.1 VEJ012M21
PK18H03T KC2023 04 25.75378 03 15 32.75 -31 10 40.5 17.3 GVEJ012M21
PK18H03T [C2023 04 27.36587 03 15 47.717-33 40 52.07 15.1 GVEJ012Q62
PK18H03T [C2023 04 27.37019 03 15 47.741-33 41 17.09 15.0 GVEJ012Q62
PK18H03T KC2023 04 30.96449 03 15 59.90 -39 26 36.1 15.0 VqEJ012I47
PK18H03T KC2023 04 30.97383 03 15 59.84 -39 27 30.9 15.0 VqEJ012I47
Observer details:
247 Roving Observer. Observer M. Mattiazzo. C11 RASA f/2.2 + Canon 6D.
291 LPL/Spacewatch II. Observer R. A. Mastaler. 1.8-m f/2.7 reflector + CCD.
474 Mount John Observatory, Lake Tekapo. Observers A. C. Gilmore, P. M.
Kilmartin. Measurer P. M. Kilmartin. 1.0-m f/7.7 reflector + CCD.
807 Cerro Tololo Observatory, La Serena. Observers T. Linder, R. Holmes.
0.61-m f/6.5 astrograph + CCD, 1.00-m f/10.0 astrograph + CCD.
C51 WISE. Observer Near-Earth Object Wide-field Infrared Survey Explorer.
Measurers A. K. Mainzer, J. M. Bauer, T. Grav, J. R. Masiero, J. W.
Dailey, R. M. Cutri, E. L. Wright, C. Nugent, S. Sonnett, E. Kramer, J.
Masiero.
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, K. Chambers, T. Lowe, A.
Schultz, I. Smith. Measurers S. Chastel, M. Huber, Y. Ramanjooloo, R.
Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
I41 Palomar Mountain--ZTF. Observer . Measurer S. Deen. 1.2-m Oschin
Schmidt + CCD.
I47 Pierre Auger Observatory, Malargue. Observer M. Masek. 0.3-m f/6.8
reflector + CCD.
L81 Skygems Namibia Remote Observatory. Observers M. Jaeger, L. Demetz.
Measurer M. Jaeger. 0.2-m f/2.8 reflector + CCD.
M21 Schiaparelli Southern Observatory, Hakos. Observers A. Aletti, F.
Bellini, L. Buzzi, G. Galli. Measurers L. Buzzi, A. Aletti. 0.36-m f/8.4
reflector + CCD.
Q62 iTelescope Observatory, Siding Spring. Observer M. Suzuki. 0.51-m f/6.8
Corrected Dall-Kirkham Astrograph + CCD.
T12 University of Hawaii 88-inch telescope, Maunakea. Observer D. Hung.
Measurer D. J. Tholen. 2.24-m f/10.1 reflector + CCD.
W88 Slooh.com Chile Observatory, La Dehesa. Observers B. Lutkenhoner, N.
Paul. 0.43-m f/6.8 Corrected Dall-Kirkham + CCD.
X07 iTelescope Deep Sky Chile, Rio Hurtado. Observer H. Sato. 0.065-m f/3.5
refractor + CMOS.
Orbital elements:
P/2018 HT3 (NEOWISE)
Epoch 2023 Feb. 25.0 TT = JDT 2460000.5
T 2023 Mar. 29.61969 TT Rudenko
q 0.5189620 (2000.0) P Q
n 0.19204212 Peri. 216.36590 -0.68755435 -0.54827785
a 2.9753522 Node 283.21203 +0.72613187 -0.52025825
e 0.8255796 Incl. 29.27704 -0.00122987 -0.65476923
P 5.13
From 67 observations 2012 Sept. 6-2023 Apr. 30, mean residual 0".3.
Ephemeris:
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2023 04 03 02 48 45.6 -00 24 42 0.7406 0.5275 31.0 102.7 14.6
...
2023 04 18 03 12 22.1 -19 41 54 0.5477 0.6606 37.6 112.0 14.9
...
2023 04 26 03 15 36.8 -31 33 29 0.4798 0.7671 47.4 105.2 15.3
...
2023 05 02 03 16 00.4 -41 09 06 0.4411 0.8526 57.1 97.1 15.5
2023 05 03 03 15 58.0 -42 49 22 0.4356 0.8671 58.9 95.6 15.6
2023 05 04 03 15 54.2 -44 31 02 0.4303 0.8816 60.7 94.1 15.6
...
2023 05 10 03 15 05.3 -55 12 25 0.4046 0.9691 72.6 83.9 15.9
...
2023 05 18 03 12 18.4 -70 51 08 0.3879 1.0852 90.3 68.7 16.3
...
2023 06 02 15 32 54.4 -78 54 14 0.4291 1.2971 122.7 41.1 17.3
M. P. C. Staff (C) Copyright 2023 MPC M.P.E.C. 2023-J12
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