1981 UB1

1981UB1, 05550, 1975 RQ2, 1975RQ2, 1977 AM, 1977AM, 1981 SP5, 1981SP5, 1983 CP2, 1983CP2, 1986 WD8, 1986WD8, J75R02Q, J77A00M, J81S05P, J81U01B, J83C02P, J86W08D

All data for this body: [vot]

MPC data
Name (number) 1981 UB1 (5550)
a 3.08708
e 0.18143
i / sin(i) 1.1147 / 0.01945
q 2.52700
Q 3.64716
ω 284.9968
Node 145.7836
m 329.4454
n 0.1817
Epoch 2460800.5
nobs 3967
nopp 31
Years observed 1954-2025
rms 0.68
Best values
[raw, vot]

Value Standard error
Parent Themis (24)
 
ap 3.092
ep 0.163
sin(ip) 0.016
G 0.150
H 12.360
Mass
D 18.69 0.073
pV 0.073 0.0114
Value
Rotational Period
Period quality None
Spectral Class X
Spectral Class Score 8.656
Family data
[raw, vot]

Parent Parent name Family ID Family name Cj Author Reference Method
24 Themis 0 Themis Novakovic 2019EPSC...13.1671N HCM
24 Themis 602 Themis -0.6400 Nesvorny doi.org/10.26033/6cg5-pt13 HCM-2020-08-14
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
3.0919 0.1626 0.0162 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
18.32 0.110 0.110 Masiero 2014ApJ...791..121M NEATM
18.99 0.097 0.097 Masiero 2011ApJ...741...68M NEATM
19.40 6.280 6.280 Nugent 2016AJ....152...63N NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.060 0.0400 0.0400 Nugent 2016AJ....152...63N NEATM
0.071 0.0147 0.0147 Masiero 2011ApJ...741...68M NEATM
0.080 0.0200 0.0200 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
12.36 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 0.211 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT
X X 0.6210 0.7470 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
X X 0.8216 0.7470 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
Xt Xt None None Movis NIR Popescu 2018A&A...617A..12P PHOT