Ilmatar

00385, 1894 EA, 1894EA, 1918 CC, 1918CC, 1942 FQ, 1942FQ, 1953 TQ, 1953TQ, 1987 QG3, 1987QG3, I94E00A, J18C00C, J42F00Q, J53T00Q, J87Q03G

All data for this body: [vot]

MPC data
Name (number) Ilmatar (385)
a 2.84793
e 0.12677
i / sin(i) 13.5803 / 0.23481
q 2.48689
Q 3.20898
ω 189.1200
Node 344.8395
m 101.1031
n 0.2051
Epoch 2460800.5
nobs 8765
nopp 68
Years observed 1894-2025
rms 0.49
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.847
ep 0.185
sin(ip) 0.237
G 0.150
H 7.810
Mass 8.905e+17 3.642e+17
D 85.80 0.424
pV 0.211 0.0061
Value
Rotational Period 62.300
Period quality 3
Spectral Class E
Spectral Class Score 3.220
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.8467 0.1849 0.2375 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Mass data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
1.0390e+18 5.1500e+17 5.1500e+17 Fienga 2020MNRAS.492..589F Ephem
7.4200e+17 Folkner 2014IPNPR.196C...1F Ephem
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
68.13 6.810 6.810 Ali-Lagoa 2018A&A...612A..85A NEATM
69.00 nan nan Marchis 2006Icar..185...39M AO
80.87 8.090 8.090 Ali-Lagoa 2018A&A...612A..85A NEATM
83.69 0.750 0.750 Usui 2011PASJ...63.1117U NEATM
85.84 0.580 0.580 Masiero 2014ApJ...791..121M NEATM
91.53 1.600 1.600 Tedesco 2002AJ....123.1056T STM
93.41 2.882 2.882 Ryan&Woodward 2010AJ....140..933R IRAS-STM
94.45 2.560 2.560 Masiero 2011ApJ...741...68M NEATM
96.69 5.079 5.079 Ryan&Woodward 2010AJ....140..933R IRAS-NEATM
96.80 9.680 9.680 Ali-Lagoa 2018A&A...612A..85A NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.187 0.0370 0.0370 Ali-Lagoa 2018A&A...612A..85A NEATM
0.196 0.0207 0.0207 Ryan&Woodward 2010AJ....140..933R IRAS-NEATM
0.200 0.0327 0.0327 Masiero 2011ApJ...741...68M NEATM
0.206 0.0130 0.0130 Ryan&Woodward 2010AJ....140..933R IRAS-STM
0.213 0.0080 0.0080 Tedesco 2002AJ....123.1056T STM
0.240 0.0400 0.0400 Masiero 2014ApJ...791..121M NEATM
0.268 0.0540 0.0540 Ali-Lagoa 2018A&A...612A..85A NEATM
0.377 0.0750 0.0750 Ali-Lagoa 2018A&A...612A..85A 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
7.81 MPC-2023-12-04 MPC-2023-12-04 Phot
Periods
[raw, vot]

Value Quality Side real or Synodic Author Reference Method
62.35 3 Synodic Zeigler 1986MPBu...13...25Z Lightcurve
62.539 2 Sidereal Durech 2020A&A...643A..59D Model
Spectral Class Data
[raw, vot]

Class 1 Class 2 Probability of Class 1 Probability of Class 2 Taxonomy Wavelength Author Reference Method
E L 0.460000 0.460000 Mahlke VISNIR Mahlke 2022A&A...665A..26M SPEC
S Tholen VIS Clark 1995Icar..113..387C PHOT
Sp Howell VISNIR Howell 1994JGR....9910847H PHOT