1999 ST21

1999ST21, 2000 WE41, 2000WE41, 96871, J99S21T, K00W41E

All data for this body: [vot]

MPC data
Name (number) 1999 ST21 (96871)
a 2.69528
e 0.03234
i / sin(i) 13.5053 / 0.23354
q 2.60810
Q 2.78245
ω 208.6534
Node 239.8153
m 191.7422
n 0.2227
Epoch 2460800.5
nobs 1264
nopp 19
Years observed 1999-2025
rms 0.76
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.695
ep 0.054
sin(ip) 0.249
G 0.150
H 15.060
Mass
D 2.92 0.166
pV 0.272 0.0748
Value
Rotational Period 81.423
Period quality 2
Spectral Class S
Spectral Class Score 10.706
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.6946 0.0539 0.2486 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
2.92 0.166 0.166 Masiero 2011ApJ...741...68M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.272 0.0748 0.0748 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
15.06 MPC-2023-12-04 MPC-2023-12-04 Phot
Periods
[raw, vot]

Value Quality Side real or Synodic Author Reference Method
81.4233 2 Synodic Pal 2020ApJS..247...26P Lightcurve
Spectral Class Data
[raw, vot]

Class 1 Class 2 Probability of Class 1 Probability of Class 2 Taxonomy Wavelength Author Reference Method
L S 0.4808 0.5140 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
Ds Ad None None Movis NIR Popescu 2018A&A...617A..12P PHOT
S S 0.5038 0.5140 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
S S 0.5774 0.5140 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
S S 0.7031 0.5140 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT