Helsinki

01495, 1938 SW, 1938SW, J38S00W

All data for this body: [vot]

MPC data

Name (number)	Helsinki (1495)
a	2.63841
e	0.15479
i / sin(i)	12.7250 / 0.22027
q	2.23001
Q	3.04681
ω	268.4967
Node	13.0614
m	1.4289
n	0.2300
Epoch	2460200.5

n_obs	8438
n_opp	38
Years observed	1930-2023
rms	0.33

Best values

	Value	Standard error
Parent	Eunomia (15)

a_p	2.639
e_p	0.138
sin(i_p)	0.224

	Value	Standard error
G	0.150
H	11.700
Mass
D	13.12	0.021
pV	0.205	0.0149

Family data

Parent	Parent name	Family ID	Family name	C_j	Author	Reference	Method
15	Eunomia	502	Eunomia	-0.1200	Nesvorny	doi.org/10.26033/6cg5-pt13	HCM-2020-08-14

Proper elements data

a_p	e_p	sin(i_p)	Author	Reference	Method
2.6392	0.1377	0.2239	Novakovic_Radovic_Todovic	2003A&A...403.1165K	Numeric-Oct-2022

Diameter data

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

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

Value	Uncertainty up	Uncertainty down	Author	Reference	Method
0.15			MPC-2023-12-94	MPC-2023-12-94	Phot

H data

Value	Uncertainty up	Uncertainty down	Author	Reference	Method
11.70			MPC-2023-12-04	MPC-2023-12-04	Phot