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Minor planet follow-up portal
v. 3.14.3
2009 HC21
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Type
NEO (Apollo)
Status
Actively Following
Characterization Target
Source
Yarkovsky
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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Last Update: 2024-Apr-18 19:14
Orbital Elements
MPC Minor Planet
Epoch of elements (MJD)
60277.0
Nov. 29, 2023
Orbital inclination in deg
19.35415
Longitude of Ascending Node (deg)
213.29334
Arg of perihelion (deg)
126.9253
Eccentricity
0.1569759
Mean distance (AU)
1.1682953
Mean Anomaly (deg)
88.68131
Absolute Magnitude (H)
22.12
Slope Parameter (G)
0.15
Albedo (average)
0.17
Albedo (range)
0.01 - 0.60
Diameter in meters (average)
134
Diameter in meters
(range)
65 - 501
Physical Parameters
Diameter
Initial Diameter Guess using H=22.12 and albedo=0.14 (0.01 to 0.5)
MPC Default
133.8 m
+367.0 / -63.0
Absolute Magnitude
MPO740171
22.1
Follow-up Details
Number of observations
72
Arc length (days)
2191.00
Time since last observation (days)
3536.79
Spectroscopy Details
Known Taxonomies
None
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