MPEC 2019-B44 : COMET P/2019 A4 (PANSTARRS)
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M.P.E.C. 2019-B44 Issued 2019 Jan. 17, 17:21 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets and routine data on comets. 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/2019 A4 (PANSTARRS)
This comet was reported on Jan. 10 as having a 3".6 FWHM (compared to
~1".6 FWHM for nearby stars) and a ~7" tail in P.A. ~275. In subsequently-
reported prediscovery images from Jan. 3, R. Weryk (F51) reported a 2".2 FWHM
(compared to stellar 1".259 FWHM) and a ~8" tail towards the west. Weryk
and R. Wainscoat (568, Jan. 11) described a 1".34 FWHM (stellar 0".66 +/-
0".04) and a 10" tail in P.A. 280. R. S. McMillan (691, Jan. 12) reported a
faint coma and a 4"-6" in P.A. ~280. H. Sato (Q62, Jan. 12) described a
strongly-condensed 8" coma and a 10" tail in P.A. 280. D. D. Balam (658)
reported a condensed 6" coma and a 12" tail in P.A. 288.
Observations:
PK19A040 C2019 01 03.54298107 42 48.977+17 25 50.60 VEB044F51
PK19A040 C2019 01 03.55524307 42 48.259+17 25 56.64 20.1 GVEB044F51
PK19A040 C2019 01 03.56748907 42 47.554+17 26 02.74 20.0 GVEB044F51
PK19A040* C2019 01 10.36534 07 36 21.791+18 24 35.82 20.6 wUEB044F51
PK19A040 C2019 01 10.37717 07 36 21.057+18 24 42.33 20.5 wUEB044F51
PK19A040 C2019 01 10.38916 07 36 20.347+18 24 48.66 20.6 wUEB044F51
PK19A040 C2019 01 11.35667 07 35 23.39 +18 33 18.7 19.5 RoEB044691
PK19A040 C2019 01 11.36463 07 35 22.92 +18 33 22.9 19.7 RoEB044691
PK19A040 ^C2019 01 11.36870707 35 23.027+18 33 25.89 20.33GVEB044568
PK19A040 ^C2019 01 11.36989707 35 22.954+18 33 26.54 20.39GVEB044568
PK19A040 C2019 01 11.36994 07 35 22.51 +18 33 25.6 19.4 RoEB044691
PK19A040 ^C2019 01 11.37109707 35 22.885+18 33 27.19 20.45GVEB044568
PK19A040 KC2019 01 11.86104907 34 54.02 +18 37 43.9 20.1 GVEB044L01
PK19A040 pC2019 01 11.88389907 34 52.71 +18 37 55.7 20.2 GVEB044L01
PK19A040 KC2019 01 11.96637 07 34 47.68 +18 38 41.0 19.4 RqEB044L27
PK19A040 9C2019 01 11.98363 07 34 46.78 +18 38 51.0 20.1 GVEB044G40
PK19A040 KC2019 01 11.98641 07 34 46.44 +18 38 51.2 19.4 RqEB044L27
PK19A040 9C2019 01 12.00073 07 34 45.73 +18 39 00.6 19.8 GVEB044G40
PK19A040 KC2019 01 12.00644 07 34 45.23 +18 39 01.6 19.6 RqEB044L27
PK19A040 HC2019 01 12.29106 07 34 28.59 +18 41 33.8 19.8 RoEB044691
PK19A040 HC2019 01 12.29841 07 34 28.17 +18 41 37.5 19.6 RoEB044691
PK19A040 HC2019 01 12.30575 07 34 27.70 +18 41 41.7 19.7 RoEB044691
PK19A040 C2019 01 12.47555 07 34 17.43 +18 43 10.0 VEB044I52
PK19A040 C2019 01 12.47851 07 34 17.20 +18 43 11.7 20.2 GVEB044I52
PK19A040 C2019 01 12.48279 07 34 16.91 +18 43 14.3 19.5 GVEB044I52
PK19A040 C2019 01 12.48576 07 34 16.75 +18 43 16.2 19.4 GVEB044I52
PK19A040 1C2019 01 12.56064 07 34 12.80 +18 44 02.4 VEB044Q62
PK19A040 1C2019 01 12.56511 07 34 12.56 +18 44 05.2 19.3 GVEB044Q62
PK19A040 1C2019 01 15.19810 07 31 37.67 +19 07 15.7 LEB044658
PK19A040 1C2019 01 15.20023 07 31 37.55 +19 07 16.8 LEB044658
PK19A040 1C2019 01 15.20450 07 31 37.30 +19 07 19.1 LEB044658
PK19A040 1C2019 01 15.20666 07 31 37.17 +19 07 20.4 LEB044658
PK19A040 C2019 01 15.24843 07 31 34.70 +19 07 44.2 20.1 GVEB044I52
PK19A040 C2019 01 15.25159 07 31 34.42 +19 07 46.4 19.4 GVEB044I52
PK19A040 C2019 01 15.25777 07 31 34.09 +19 07 48.8 19.6 GVEB044I52
PK19A040 C2019 01 15.26227 07 31 33.84 +19 07 51.9 19.6 GVEB044I52
PK19A040 KC2019 01 16.01741 07 30 49.23 +19 14 30.9 19.5 GVEB044K38
PK19A040 KC2019 01 16.04655 07 30 47.52 +19 14 45.9 19.6 GVEB044K38
PK19A040 KC2019 01 16.07870 07 30 45.55 +19 15 04.3 20.0 GVEB044K38
PK19A040 C2019 01 17.17730 07 29 41.76 +19 24 47.7 VEB044I52
PK19A040 C2019 01 17.18055 07 29 41.64 +19 24 51.0 19.3 GVEB044I52
PK19A040 C2019 01 17.18434 07 29 41.36 +19 24 51.8 19.4 GVEB044I52
PK19A040 C2019 01 17.18751 07 29 41.24 +19 24 53.4 19.3 GVEB044I52
Observer details:
568 Mauna Kea. Observers R. Wainscoat, L. Wells, S. Prunet. Measurers
R. Weryk, R. Wainscoat. 3.6-m Canada-France-Hawaii Telescope + CCD.
658 National Research Council of Canada. Observer D. D. Balam. 1.82-m
reflector + CCD.
691 Steward Observatory, Kitt Peak-Spacewatch. Observers M. J. Brucker,
R. A. Mastaler. 0.9-m f/3 reflector + CCD.
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, K. Chambers, T. Lowe,
E. Magnier, A. Schultz, M. Willman. Measurers S. Chastel, M. Huber,
Y. Ramanjooloo, R. Wainscoat, R. Weryk, K. Chambers, L. Denneau,
J. Fairlamb, H. Flewelling, C.-C. Lin, E. Magnier. 1.8-m
Ritchey-Chretien + CCD.
G40 Slooh.com Canary Islands Observatory. Observer B. Lutkenhoner. 0.5-m
f/6.8 Corrected Dall-Kirkham + CCD.
I52 Steward Observatory, Mt. Lemmon Station. Observers B. M. Africano,
G. J. Leonard, D. C. Fuls. Measurers B. M. Africano, E. J. Christensen,
G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer, H. Groeller,
R. A. Kowalski, S. M. Larson, G. J. Leonard, R. L. Seaman, F. C. Shelly.
1.0-m reflector + CCD.
K38 M57 Observatory, Saltrio. Observer G. Baj. 0.3-m f/5.5 Ritchey-Chretien
+ CCD.
L01 Visnjan Observatory, Tican. Observers K. Korlevic, F. Valentine.
Measurer K. Korlevic. 1.0-m f/2.9 reflector + CCD.
L27 29PREMOTE Observatory, Dauban. Observer J.-F. Soulier. 0.20-m f/4
Newtonian reflector + CCD.
Q62 iTelescope Observatory, Siding Spring. Observer H. Sato. 0.51-m f/6.8
astrograph + CCD + f/4.5 focal reducer.
Orbital elements:
P/2019 A4 (PANSTARRS)
Epoch 2018 Nov. 18.0 TT = JDT 2458440.5
T 2018 Nov. 29.53062 TT MPCW
q 2.3561010 (2000.0) P Q
n 0.23426596 Peri. 339.90577 -0.16985269 -0.96575377
a 2.6061331 Node 119.42691 +0.93213489 -0.22203465
e 0.0959399 Incl. 13.01407 +0.31980401 +0.13423961
P 4.21
From 43 observations 2019 Jan. 3-17, mean residual 0".5.
P/2019 A4 (PANSTARRS)
Epoch 2023 Feb. 25.0 TT = JDT 2460000.5
T 2023 Feb. 18.51152 TT MPCW
q 2.3627954 (2000.0) P Q
n 0.23428326 Peri. 340.98412 -0.18703008 -0.96259032
a 2.6060048 Node 119.37112 +0.92793847 -0.23861914
e 0.0933265 Incl. 13.00163 +0.32241268 +0.12837750
P 4.21
From 43 observations 2019 Jan. 3-17, mean residual 0".5.
P/2019 A4 (PANSTARRS)
Epoch 2019 Apr. 27.0 TT = JDT 2458600.5
T 2018 Nov. 29.39703 TT MPCW
q 2.3560621 (2000.0) P Q
n 0.23432458 Peri. 339.86878 -0.16923084 -0.96586051
a 2.6056984 Node 119.42695 +0.93227933 -0.22143727
e 0.0958040 Incl. 13.01488 +0.31971265 +0.13445823
P 4.21
From 43 observations 2019 Jan. 3-17, mean residual 0".5.
Ephemeris:
P/2019 A4 (PANSTARRS)
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2018 12 18 07 55 05.5 +15 23 41 1.4666 2.3570 147.6 12.9 19.6
...
2019 01 02 07 44 12.3 +17 13 02 1.3938 2.3590 165.6 6.0 19.4
...
2019 01 10 07 36 42.9 +18 21 24 1.3792 2.3605 175.1 2.0 19.4
...
2019 01 16 07 30 50.5 +19 14 25 1.3801 2.3618 175.4 1.9 19.4
2019 01 17 07 29 52.0 +19 23 16 1.3812 2.3621 174.3 2.4 19.4
2019 01 18 07 28 53.7 +19 32 06 1.3826 2.3623 173.2 2.8 19.4
...
2019 01 24 07 23 15.5 +20 24 22 1.3970 2.3639 165.9 5.8 19.5
...
2019 02 01 07 16 35.0 +21 30 28 1.4312 2.3663 156.2 9.7 19.5
...
2019 02 16 07 08 26.3 +23 16 32 1.5365 2.3716 138.9 15.9 19.7
Gareth V. Williams (C) Copyright 2019 MPC M.P.E.C. 2019-B44
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