2004 EH21

2004EH21, 1998 BY34, 1998BY34, J98B34Y, K04E21H, K6825

All data for this body: [vot]

MPC data
Name (number) 2004 EH21 (206825)
a 3.08643
e 0.08352
i / sin(i) 5.2390 / 0.09131
q 2.82866
Q 3.34421
ω 337.5680
Node 178.3521
m 343.8171
n 0.1818
Epoch 2460800.5
nobs 490
nopp 18
Years observed 1998-2025
rms 0.89
Best values
[raw, vot]

Value Standard error
Parent Hygiea (10)
 
ap 3.083
ep 0.122
sin(ip) 0.090
G 0.150
H 16.050
Mass
D 3.40 0.736
pV 0.073 0.0387
Value
Rotational Period
Period quality None
Spectral Class C
Spectral Class Score 2.360
Family data
[raw, vot]

Parent Parent name Family ID Family name Cj Author Reference Method
10 Hygiea 0 Hygiea Novakovic 2019EPSC...13.1671N HCM
10 Hygiea 601 Hygiea Nesvorny doi.org/10.26033/6cg5-pt13 HCM-2020-08-14
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
3.0828 0.1223 0.0900 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
3.40 0.736 0.736 Masiero 2011ApJ...741...68M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.073 0.0387 0.0387 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
16.05 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 0.08 Bus VIS Carvano 2010A&A...510A..43C PHOT
C C 0.1673 0.1830 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
C C 0.1994 0.1830 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT