Helenyao

1998 SY138, 1998SY138, 1999 XS231, 1999XS231, 28137, J98SD8Y, J99XN1S

All data for this body: [vot]

MPC data
Name (number) Helenyao (28137)
a 2.39395
e 0.07615
i / sin(i) 7.2805 / 0.12673
q 2.21166
Q 2.57625
ω 228.8137
Node 8.6818
m 206.2299
n 0.2661
Epoch 2460800.5
nobs 2278
nopp 21
Years observed 1993-2025
rms 0.77
Best values
[raw, vot]

Value Standard error
Parent Vesta (4)
 
ap 2.393
ep 0.097
sin(ip) 0.124
G 0.150
H 14.860
Mass
D
pV
Value
Rotational Period
Period quality None
Spectral Class None
Spectral Class Score
Family data
[raw, vot]

Parent Parent name Family ID Family name Cj Author Reference Method
4 Vesta 0 Vesta Novakovic 2019EPSC...13.1671N HCM
4 Vesta 401 Vesta Nesvorny doi.org/10.26033/6cg5-pt13 HCM-2020-08-14
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.3928 0.0971 0.1244 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
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
14.86 MPC-2023-12-04 MPC-2023-12-04 Phot