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v. 3.14.2
Leonard (C/2021 U4)
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Name
C6DP222 → C/2021 U4
Type
Comet
Status
Not Following
Source
Minor Planet Center
UTC date
------------ Any 1.0m ------------
LSC 1.0m - W85-87; (CTIO, Chile)
ELP 1.0m - V37,V39; (McDonald, Texas)
COJ 1.0m - Q63-64; (Siding Spring, Aust.)
CPT 1.0m - K91-93; (Sutherland, S. Africa)
TFN 1.0m - Z31,Z24; (Tenerife, Spain)
------------ Any 0.4m ------------
LSC 0.4m - W89,W79; (CTIO, Chile)
ELP 0.4m - V38; (McDonald, Texas)
OGG 0.4m - T03-04; (Maui, Hawaii)
COJ 0.4m - Q58-59; (Siding Spring, Aust.)
CPT 0.4m - L09; (Sutherland, S. Africa)
TFN 0.4m - Z17,Z21; (Tenerife, Spain)
------------ Any 2.0m ------------
FTS 2.0m - E10; (Siding Spring, Aust.) [MuSCAT4]
FTN 2.0m - F65; (Maui, Hawaii ) [MuSCAT3]
------------ Non LCO ------------
Mt John 1.8m - 474 (Mt John, NZ)
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Measurements
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Last Update: 2021-Nov-08 00:00
Orbital Elements
MPC Comet
Epoch of elements (MJD)
59600.0
Jan. 21, 2022
Orbital inclination in deg
152.87773
Longitude of Ascending Node (deg)
241.80509
Arg of perihelion (deg)
237.27958
Eccentricity
0.9601887
Perihelion distance (AU)
1.7874266
Epoch of perihelion
Dec. 21, 2021, 10:38 p.m.
Epoch of perihelion (MJD)
59569.94326
Total Magnitude (M1)
18.8
Slope Parameter (k1)
4.5
Physical Parameters
Phase Slope
MPC Default
1.8
Reciprocal of semimajor axis
E2021-W31
0.022536 au
+/- 0.0000817
+/- 0.0000817
K1
autocmod 2.9e
2
4.5
M1
2 parameter fit from 33 observations, autocmod 2.9e
2
18.8
+/- 0.4
Diameter
Initial Diameter Guess using H=18.1 and albedo=0.14 (0.01 to 0.5)
MPC Default
852.04 m
+2336.0 / -401.0
Follow-up Details
NEOCP
digest2
score
96
Number of observations
36
Arc length (days)
32.00
Time since last observation (days)
111.05
Spectroscopy Details
Known Taxonomies
None
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