MPEC 2021-D113 : COMET C/2021 C4 (ATLAS)
The following Minor Planet Electronic Circular may be linked-to from your own Web pages, but must not otherwise be redistributed electronically.A form allowing access to any MPEC is at the bottom of this page.
Read MPEC 2021-D112
Read MPEC 2021-D114
M.P.E.C. 2021-D113 Issued 2021 February 26, 05:20 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 C/2021 C4 (ATLAS)
An object detected on Feb. 12 UT by ATLAS-HKO (T05) was initially reported
as a posssible NEO. B. Lutkenhoner reports it displayed a 7" coma in exposures
taken by Slooh.com Chile Observatory (W88) on Feb 16. Additional reports of
cometary features are as follows:
OC Date Reporter Coma Tail PA Exposures
Q62 2021-02-20 C. Jacques 10"
X02 2021-02-22 E. Guido 8" 5x90s
Q62 2021-02-22 H. Sato 8" 6x60s
Observations:
CK21C040* C2021 02 12.61103914 54 20.38 -43 58 05.0 18.73cVED113T05
CK21C040 C2021 02 12.61378414 54 20.26 -43 58 04.7 19.00cVED113T05
CK21C040 C2021 02 12.61698514 54 20.21 -43 58 05.2 18.74cVED113T05
CK21C040 C2021 02 12.62700314 54 19.69 -43 58 03.9 19.11cVED113T05
CK21C040 |C2021 02 13.29560 14 53 54.29 -43 57 04.0 18.8 VuED113807
CK21C040 |C2021 02 13.29776 14 53 54.17 -43 57 03.8 18.4 VuED113807
CK21C040 |C2021 02 13.30215 14 53 54.05 -43 57 03.3 18.7 VuED113807
CK21C040 |C2021 02 13.30437 14 53 53.90 -43 57 03.4 18.9 VuED113807
CK21C040 |C2021 02 13.30644 14 53 53.84 -43 57 03.0 18.9 VuED113807
CK21C040 |C2021 02 15.28339 14 52 34.16 -43 53 56.1 18.8 GVED113807
CK21C040 |C2021 02 15.28446 14 52 34.11 -43 53 56.0 18.6 GVED113807
CK21C040 |C2021 02 15.28555 14 52 34.08 -43 53 55.9 18.7 GVED113807
CK21C040 |C2021 02 15.28663 14 52 34.05 -43 53 56.2 18.9 GVED113807
CK21C040 3C2021 02 16.31253 14 51 50.26 -43 52 09.1 18.8 GVED113W88
CK21C040 3C2021 02 16.33314 14 51 49.38 -43 52 06.5 18.7 GVED113W88
CK21C040 C2021 02 17.65423114 50 50.66 -43 49 37.6 19.1 GVED113474
CK21C040 C2021 02 17.65822914 50 50.47 -43 49 37.1 19.1 GVED113474
CK21C040 C2021 02 17.66222814 50 50.23 -43 49 36.6 18.7 GVED113474
CK21C040 1C2021 02 17.77106 14 50 45.31 -43 49 23.9 VED113Q62
CK21C040 1C2021 02 17.77446 14 50 45.18 -43 49 23.4 18.7 GVED113Q62
CK21C040 KC2021 02 18.61371 14 50 06.34 -43 47 41.7 19.0 RqED113E94
CK21C040 KC2021 02 18.63182 14 50 05.53 -43 47 39.9 18.9 RqED113E94
CK21C040 KC2021 02 18.64995 14 50 04.61 -43 47 38.4 18.9 RqED113E94
CK21C040 KC2021 02 18.66808 14 50 03.69 -43 47 35.9 18.9 RqED113E94
CK21C040 3C2021 02 18.67596 14 50 03.57 -43 47 34.6 18.1 RVED113Q62
CK21C040 3C2021 02 18.68202 14 50 03.13 -43 47 33.6 17.9 RVED113Q62
CK21C040 3C2021 02 18.69214 14 50 02.79 -43 47 32.1 18.2 RVED113Q62
CK21C040 5C2021 02 20.59926 14 48 30.17 -43 43 19.2 18.1 RVED113Q62
CK21C040 5C2021 02 20.60270 14 48 29.98 -43 43 18.5 18.1 RVED113Q62
CK21C040 5C2021 02 20.60742 14 48 29.77 -43 43 17.7 18.1 RVED113Q62
CK21C040 C2021 02 20.62326814 48 28.89 -43 43 16.0 18.6 GVED113474
CK21C040 C2021 02 20.62726914 48 28.67 -43 43 15.3 18.8 GVED113474
CK21C040 C2021 02 20.63127014 48 28.49 -43 43 14.7 18.9 GVED113474
CK21C040 KC2021 02 22.23405 14 47 06.38 -43 39 19.0 18.5 GVED113X02
CK21C040 KC2021 02 22.24027 14 47 05.96 -43 39 17.9 18.9 GVED113X02
CK21C040 1C2021 02 22.63902 14 46 44.89 -43 38 17.0 VED113Q62
CK21C040 1C2021 02 22.64159 14 46 44.78 -43 38 16.4 18.5 GVED113Q62
Observer details:
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.
E94 Possum Observatory, Gisborne. Observer J. Drummond. 0.41-m f/4.5
Newtonian reflector + CCD.
Q62 iTelescope Observatory, Siding Spring. Observers H. Sato, R. Ligustri, C.
Jacques, E. Pimentel, J. Barros. Measurers H. Sato, R. Ligustri, C.
Jacques. 0.51-m f/6.8 astrograph + CCD + f/4.5 focal reducer, 0.50-m
f/4.5 astrograph + CCD.
T05 ATLAS-HKO, Haleakala. Observers L. Denneau, J. Tonry, A. Heinze, H.
Weiland. Measurers L. Denneau, J. Tonry, A. Heinze, H. Weiland, H.
Flewelling, A. Fitzsimmons, J. Robinson, N. Erasmus. 0.5-m reflector +
CCD.
W88 Slooh.com Chile Observatory, La Dehesa. Observer B. Lutkenhoner. 0.43-m
f/6.8 Corrected Dall-Kirkham + CCD.
X02 Telescope Live, El Sauce. Observers E. Guido, M. Rocchetto, E. Bryssinck,
M. Fulle, G. Milani, C. Nassef, G. Savini, A. Valvasori. Measurer E.
Guido. 0.6-m f/6.5 astrograph + CCD.
Orbital elements:
C/2021 C4 (ATLAS)
Epoch 2021 Jan. 26.0 TT = JDT 2459240.5
T 2021 Jan. 21.04894 TT Rudenko
q 4.5041455 (2000.0) P Q
z -0.0000112 Peri. 320.80609 -0.64524298 -0.74232238
+/-0.0000000 Node 194.26203 -0.37306167 +0.09984880
e 1.0000504 Incl. 132.85204 -0.66669820 +0.66256147
From 37 observations 2021 Feb. 12-22, mean residual 0".4.
C/2021 C4 (ATLAS)
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5
T 2021 Jan. 21.03130 TT Rudenko
q 4.5041497 (2000.0) P Q
z -0.0000000 Peri. 320.80393 -0.64520922 -0.74234936
+/-0.0000000 Node 194.26269 -0.37306661 +0.09982018
e 1.0000000 Incl. 132.85149 -0.66672810 +0.66253555
From 37 observations 2021 Feb. 12-22, mean residual 0".4.
Ephemeris:
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2021 01 27 15 01 29.3 -44 10 51 4.6929 4.5044 73.0 12.1 18.9
...
2021 02 11 14 55 19.2 -44 00 11 4.4373 4.5073 87.7 12.6 18.8
...
2021 02 19 14 49 48.1 -43 46 53 4.2986 4.5102 96.0 12.6 18.7
...
2021 02 25 14 44 35.0 -43 31 41 4.1963 4.5130 102.4 12.4 18.7
2021 02 26 14 43 37.4 -43 28 37 4.1796 4.5135 103.4 12.3 18.7
2021 02 27 14 42 38.2 -43 25 25 4.1629 4.5141 104.5 12.3 18.6
...
2021 03 05 14 36 11.4 -43 02 26 4.0654 4.5176 111.1 11.8 18.6
...
2021 03 13 14 26 14.1 -42 20 31 3.9444 4.5230 119.9 11.0 18.5
...
2021 03 28 14 04 09.5 -40 19 13 3.7589 4.5357 136.6 8.7 18.4
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-D113
Read MPEC 2021-D112
Read MPEC 2021-D114
Enter an MPEC number in one of the following forms:
- 1997-B01 (the full form)
- J97B01 (the packed version of the full form)
- B01 (the abbreviated form)