1981 EY4

1981EY4, 1999 NW18, 1999NW18, 37539, J81E04Y, J99N18W

All data for this body: [vot]

MPC data
Name (number) 1981 EY4 (37539)
a 2.61695
e 0.11097
i / sin(i) 9.2003 / 0.15989
q 2.32655
Q 2.90735
ω 31.2380
Node 311.6119
m 353.0265
n 0.2328
Epoch 2460800.5
nobs 1605
nopp 22
Years observed 1981-2025
rms 0.72
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.617
ep 0.077
sin(ip) 0.173
G 0.150
H 14.950
Mass
D 4.59 0.327
pV 0.154 0.0213
Value
Rotational Period
Period quality None
Spectral Class X
Spectral Class Score 1.921
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.6173 0.0775 0.1728 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
4.57 0.332 0.332 Masiero 2011ApJ...741...68M NEATM
5.28 1.852 1.852 Masiero 2017AJ....154..168M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.091 0.0644 0.0644 Masiero 2017AJ....154..168M NEATM
0.161 0.0226 0.0226 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
14.95 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 Ad None None Movis NIR Popescu 2018A&A...617A..12P PHOT
X X 0.3201 0.3201 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT