1999 XD221

1999XD221, 1979 HH1, 1979HH1, 1998 VF28, 1998VF28, 25581, J79H01H, J98V28F, J99XM1D

All data for this body: [vot]

MPC data
Name (number) 1999 XD221 (25581)
a 2.64868
e 0.09173
i / sin(i) 10.8354 / 0.18799
q 2.40571
Q 2.89166
ω 336.4029
Node 253.1128
m 236.8591
n 0.2286
Epoch 2460800.5
nobs 3613
nopp 22
Years observed 1979-2025
rms 0.69
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.646
ep 0.120
sin(ip) 0.204
G 0.150
H 13.240
Mass
D 9.12 0.070
pV 0.090 0.0086
Value
Rotational Period
Period quality None
Spectral Class D
Spectral Class Score 22.661
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.6464 0.1202 0.2038 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
12.08 0.380 0.380 Masiero 2012ApJ...759L...8M NEATM
14.54 4.210 4.210 Nugent 2016AJ....152...63N NEATM
8.62 0.170 0.170 Masiero 2014ApJ...791..121M NEATM
9.10 0.078 0.078 Masiero 2011ApJ...741...68M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.040 0.0400 0.0400 Nugent 2016AJ....152...63N NEATM
0.076 0.0100 0.0100 Masiero 2012ApJ...759L...8M NEATM
0.135 0.0197 0.0197 Masiero 2011ApJ...741...68M NEATM
0.220 0.0500 0.0500 Masiero 2014ApJ...791..121M 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
13.24 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 D 0.3559 0.8990 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
D DeMeo-Carry VIS DeMeo 2013Icar..226..723D PHOT
D 0.217 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT
D 0.96 Bus VIS Carvano 2010A&A...510A..43C PHOT
D D 0.5806 0.8990 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
D D 0.9747 0.8990 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
D D 0.9953 0.8990 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT