1998 XN21

1998XN21, 1991 PB16, 1991PB16, 44501, J91P16B, J98X21N

All data for this body: [vot]

MPC data
Name (number) 1998 XN21 (44501)
a 3.22390
e 0.19844
i / sin(i) 2.7442 / 0.04788
q 2.58415
Q 3.86365
ω 296.8228
Node 115.6184
m 239.0276
n 0.1703
Epoch 2460800.5
nobs 2363
nopp 23
Years observed 1991-2025
rms 0.74
Best values
[raw, vot]

Value Standard error
Parent
 
ap 3.198
ep 0.198
sin(ip) 0.029
G 0.150
H 13.580
Mass
D 10.09 0.117
pV 0.056 0.0104
Value
Rotational Period
Period quality None
Spectral Class C
Spectral Class Score 8.849
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
3.1980 0.1983 0.0288 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
10.09 0.117 0.117 Masiero 2011ApJ...741...68M NEATM
9.43 3.490 3.490 Nugent 2016AJ....152...63N NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.055 0.0106 0.0106 Masiero 2011ApJ...741...68M NEATM
0.070 0.0600 0.0600 Nugent 2016AJ....152...63N 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
13.58 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
B 0.106 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT
B C 0.2812 0.3810 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
C DeMeo-Carry VIS DeMeo 2013Icar..226..723D PHOT
C 0.61 Bus VIS Carvano 2010A&A...510A..43C PHOT
C C 0.4298 0.3810 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
C C 0.5084 0.3810 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT