Helsinki

01495, 1938 SW, 1938SW, J38S00W

All data for this body: [vot]

MPC data
Name (number) Helsinki (1495)
a 2.64060
e 0.15428
i / sin(i) 12.7146 / 0.22010
q 2.23320
Q 3.04799
ω 268.8909
Node 13.0235
m 139.0331
n 0.2297
Epoch 2460800.5
nobs 9227
nopp 39
Years observed 1930-2025
rms 0.45
Best values
[raw, vot]

Value Standard error
Parent Eunomia (15)
 
ap 2.639
ep 0.138
sin(ip) 0.224
G 0.150
H 11.660
Mass
D 13.12 0.021
pV 0.205 0.0149
Value
Rotational Period 5.331
Period quality 3
Spectral Class S
Spectral Class Score 33.413
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 -0.1200 Nesvorny doi.org/10.26033/6cg5-pt13 HCM-2020-08-14
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.6392 0.1377 0.2239 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
12.10 0.200 0.200 Hanus 2018Icar..309..297H RADIOMETRY_TPM
12.24 0.060 0.060 Masiero 2014ApJ...791..121M NEATM
12.75 0.090 0.090 Masiero 2012ApJ...759L...8M NEATM
13.09 2.950 2.950 Nugent 2016AJ....152...63N NEATM
13.28 0.023 0.023 Masiero 2011ApJ...741...68M NEATM
14.62 0.480 0.480 Usui 2011PASJ...63.1117U NEATM
14.81 2.960 2.960 Ali-Lagoa 2018A&A...612A..85A NEATM
14.88 1.490 1.490 Ali-Lagoa 2018A&A...612A..85A NEATM
18.37 1.700 1.700 Tedesco 2002AJ....123.1056T STM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.120 0.0260 0.0260 Tedesco 2002AJ....123.1056T STM
0.234 0.0238 0.0238 Masiero 2011ApJ...741...68M NEATM
0.239 0.0480 0.0480 Ali-Lagoa 2018A&A...612A..85A NEATM
0.241 0.0960 0.0960 Ali-Lagoa 2018A&A...612A..85A NEATM
0.250 0.1300 0.1300 Nugent 2016AJ....152...63N NEATM
0.270 0.0500 0.0500 Masiero 2014ApJ...791..121M NEATM
0.302 0.0590 0.0590 Masiero 2012ApJ...759L...8M 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
11.66 MPC-2023-12-04 MPC-2023-12-04 Phot
Periods
[raw, vot]

Value Quality Side real or Synodic Author Reference Method
5.33116 3 Synodic Oey 2007MPBu...34....2O Lightcurve
5.33116 3 Synodic Oey 2007MPBu...34....2O Lightcurve
5.33117 3 Synodic Behrend LCDB Lightcurve
5.33127 2 Sidereal Durech 2023A&A...675A..24D Model
5.33131 2 Sidereal Hanus 2013A&A...551A..67H Model
Spectral Class Data
[raw, vot]

Class 1 Class 2 Probability of Class 1 Probability of Class 2 Taxonomy Wavelength Author Reference Method
S DeMeo-Carry VIS DeMeo 2013Icar..226..723D PHOT
S Tholen VISNIR Nathues 2010Icar..208..252N SPEC+PHOT
S 0.764 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT
S S 0.8083 0.9760 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
S S 0.9966 0.9760 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
S S 0.9999 0.9760 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT
Sl Bus VISNIR Nathues 2010Icar..208..252N SPEC+PHOT
SQ 0.71 Bus VIS Carvano 2010A&A...510A..43C PHOT