1998 HJ81

1998HJ81, 55955, J98H81J

All data for this body: [vot]

MPC data
Name (number) 1998 HJ81 (55955)
a 3.20878
e 0.16450
i / sin(i) 2.5262 / 0.04408
q 2.68095
Q 3.73662
ω 216.8423
Node 61.4850
m 195.4428
n 0.1715
Epoch 2460800.5
nobs 1343
nopp 25
Years observed 1992-2025
rms 0.88
Best values
[raw, vot]

Value Standard error
Parent Themis (24)
 
ap 3.190
ep 0.183
sin(ip) 0.031
G 0.150
H 14.480
Mass
D 7.61 0.100
pV 0.058 0.0038
Value
Rotational Period
Period quality None
Spectral Class C
Spectral Class Score 2.000
Family data
[raw, vot]

Parent Parent name Family ID Family name Cj Author Reference Method
24 Themis 602 Themis 0.3200 Nesvorny doi.org/10.26033/6cg5-pt13 HCM-2020-08-14
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
3.1904 0.1826 0.0309 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
7.61 0.100 0.100 Masiero 2011ApJ...741...68M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.058 0.0038 0.0038 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
14.48 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 DeMeo-Carry VIS DeMeo 2013Icar..226..723D PHOT
X 0.19 Bus VIS Carvano 2010A&A...510A..43C PHOT
X X 0.2474 0.2474 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT