Sooner

18876, 1978 ES8, 1978ES8, 1984 YF2, 1984YF2, 1984 YP1, 1984YP1, 1997 JS, 1997JS, 1999 XM, 1999XM, J78E08S, J84Y01P, J84Y02F, J97J00S, J99X00M

All data for this body: [vot]

MPC data
Name (number) Sooner (18876)
a 2.41337
e 0.24071
i / sin(i) 8.8347 / 0.15358
q 1.83244
Q 2.99430
ω 357.0231
Node 75.4179
m 285.0300
n 0.2629
Epoch 2460800.5
nobs 2032
nopp 24
Years observed 1978-2025
rms 0.75
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.419
ep 0.247
sin(ip) 0.126
G 0.150
H 14.650
Mass
D 3.07 0.038
pV 0.345 0.0302
Value
Rotational Period
Period quality None
Spectral Class S
Spectral Class Score 7.082
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.4186 0.2467 0.1257 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
3.07 0.042 0.042 Masiero 2011ApJ...741...68M NEATM
3.09 0.090 0.090 Masiero 2012ApJ...759L...8M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.322 0.0340 0.0340 Masiero 2012ApJ...759L...8M NEATM
0.430 0.0661 0.0661 Masiero 2011ApJ...741...68M 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
14.65 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
S DeMeo-Carry VIS DeMeo 2013Icar..226..723D PHOT
S 0.95 Bus VIS Carvano 2010A&A...510A..43C PHOT
S S 0.5303 0.5303 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT