1998 UM21

1998UM21, 1990 VT5, 1990VT5, 44447, J90V05T, J98U21M

All data for this body: [vot]

MPC data
Name (number) 1998 UM21 (44447)
a 2.56870
e 0.19140
i / sin(i) 13.6372 / 0.23577
q 2.07706
Q 3.06035
ω 169.2624
Node 213.8813
m 156.8273
n 0.2394
Epoch 2460800.5
nobs 1506
nopp 22
Years observed 1990-2025
rms 0.77
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.570
ep 0.166
sin(ip) 0.237
G 0.150
H 14.800
Mass
D 3.74 0.157
pV 0.167 0.0312
Value
Rotational Period
Period quality None
Spectral Class S
Spectral Class Score 21.414
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.5701 0.1658 0.2375 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
3.74 0.157 0.157 Masiero 2011ApJ...741...68M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.167 0.0312 0.0312 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
14.80 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
D S 0.2545 0.6260 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
S 1.000000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC
S S 0.4764 0.6260 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
S S 0.7223 0.6260 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
S S 0.7383 0.6260 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
S S 0.7986 0.6260 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
V 0.11 Bus VIS Carvano 2010A&A...510A..43C PHOT
V S 0.6624 0.6260 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT