1997 WM21

1997WM21, 16831, 1990 VP1, 1990VP1, 1992 JU1, 1992JU1, J90V01P, J92J01U, J97W21M

All data for this body: [vot]

MPC data
Name (number) 1997 WM21 (16831)
a 2.24370
e 0.14703
i / sin(i) 5.6459 / 0.09838
q 1.91381
Q 2.57359
ω 264.4711
Node 232.3920
m 9.0003
n 0.2933
Epoch 2460800.5
nobs 3816
nopp 22
Years observed 1990-2025
rms 0.68
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.252
ep 0.206
sin(ip) 0.112
G 0.150
H 14.060
Mass
D 4.44 0.081
pV 0.289 0.0233
Value
Rotational Period 8.107
Period quality 2+
Spectral Class None
Spectral Class Score
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.2516 0.2058 0.1119 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
4.35 0.086 0.086 Masiero 2011ApJ...741...68M NEATM
5.22 0.250 0.250 Masiero 2012ApJ...759L...8M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.215 0.0320 0.0320 Masiero 2012ApJ...759L...8M NEATM
0.372 0.0340 0.0340 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
14.06 MPC-2023-12-04 MPC-2023-12-04 Phot
Periods
[raw, vot]

Value Quality Side real or Synodic Author Reference Method
8.1065 2+ Synodic Oey 2017MPBu...44..193O Lightcurve
8.1072 2+ Synodic Pravec LCDB Lightcurve