1981 EJ20

1981EJ20, 16380, 1997 YQ21, 1997YQ21, J81E20J, J97Y21Q

All data for this body: [vot]

MPC data
Name (number) 1981 EJ20 (16380)
a 2.66683
e 0.09339
i / sin(i) 8.9528 / 0.15562
q 2.41778
Q 2.91589
ω 103.4484
Node 358.9936
m 111.8647
n 0.2263
Epoch 2460800.5
nobs 1830
nopp 20
Years observed 1981-2025
rms 0.73
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.666
ep 0.111
sin(ip) 0.159
G 0.150
H 14.880
Mass
D 7.25 1.019
pV 0.040 0.0108
Value
Rotational Period
Period quality None
Spectral Class C
Spectral Class Score 5.610
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.6662 0.1105 0.1589 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
6.54 2.010 2.010 Masiero 2021PSJ.....2..162M NEATM
7.08 2.240 2.240 Masiero 2012ApJ...759L...8M NEATM
7.42 1.930 1.930 Masiero 2021PSJ.....2..162M NEATM
7.90 2.010 2.010 Masiero 2021PSJ.....2..162M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.033 0.0120 0.0190 Masiero 2021PSJ.....2..162M NEATM
0.039 0.0190 0.0360 Masiero 2021PSJ.....2..162M NEATM
0.050 0.0210 0.0350 Masiero 2021PSJ.....2..162M NEATM
0.051 0.0230 0.0230 Masiero 2012ApJ...759L...8M NEATM
G data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.15 MPC-2023-12-94 MPC-2023-12-94 Phot
H data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
14.88 MPC-2023-12-04 MPC-2023-12-04 Phot
Spectral Class Data
[raw, vot]

Class 1 Class 2 Probability of Class 1 Probability of Class 2 Taxonomy Wavelength Author Reference Method
C 0.935 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT