Helenos

01872, 1971 FG, 1971FG, J71F00G

All data for this body: [vot]

MPC data
Name (number) Helenos (1872)
a 5.32063
e 0.04885
i / sin(i) 14.6461 / 0.25285
q 5.06072
Q 5.58055
ω 116.1875
Node 188.7696
m 76.2439
n 0.0803
Epoch 2460800.5
nobs 3370
nopp 36
Years observed 1954-2025
rms 0.68
Best values
[raw, vot]

Value Standard error
Parent
 
ap
ep
sin(ip)
G 0.150
H 10.780
Mass
D 33.33 0.409
pV 0.074 0.0096
Value
Rotational Period
Period quality None
Spectral Class X
Spectral Class Score 5.638
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
32.71 0.560 0.560 Grav 2011ApJ...742...40G NEATM
34.05 0.600 0.600 Grav 2012ApJ...759...49G NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.067 0.0120 0.0120 Grav 2012ApJ...759...49G NEATM
0.087 0.0160 0.0160 Grav 2011ApJ...742...40G 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
10.78 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 0.739 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT
D D 0.7288 0.5330 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
X DeMeo-Carry VIS DeMeo 2013Icar..226..723D PHOT
X 0.48 Bus VIS Carvano 2010A&A...510A..43C PHOT
X D 0.4463 0.5330 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT