1999 JA18

1999JA18, 17949, 1978 SS1, 1978SS1, 1991 RK30, 1991RK30, J78S01S, J91R30K, J99J18A

All data for this body: [vot]

MPC data
Name (number) 1999 JA18 (17949)
a 2.67764
e 0.18461
i / sin(i) 12.2258 / 0.21177
q 2.18332
Q 3.17196
ω 293.8029
Node 10.4364
m 267.0913
n 0.2249
Epoch 2460800.5
nobs 4059
nopp 23
Years observed 1978-2025
rms 0.64
Best values
[raw, vot]

Value Standard error
Parent Eunomia (15)
 
ap 2.678
ep 0.156
sin(ip) 0.215
G 0.150
H 13.660
Mass
D 5.17 0.196
pV 0.316 0.0379
Value
Rotational Period
Period quality None
Spectral Class S
Spectral Class Score 3.738
Family data
[raw, vot]

Parent Parent name Family ID Family name Cj Author Reference Method
15 Eunomia 0 Eunomia Novakovic 2019EPSC...13.1671N HCM
15 Eunomia 502 Eunomia 0.3900 Nesvorny doi.org/10.26033/6cg5-pt13 HCM-2020-08-14
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.6783 0.1562 0.2152 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
5.17 0.196 0.196 Masiero 2011ApJ...741...68M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.316 0.0379 0.0379 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
13.66 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
L DeMeo-Carry VIS DeMeo 2013Icar..226..723D PHOT
S S 0.6230 0.6230 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT