Somnium

03258, 1979 HF3, 1979HF3, 1980 YG, 1980YG, 1983 RJ, 1983RJ, J79H03F, J80Y00G, J83R00J

All data for this body: [vot]

MPC data

Name (number)	Somnium (3258)
a	2.20606
e	0.19628
i / sin(i)	7.5532 / 0.13145
q	1.77306
Q	2.63906
ω	296.8441
Node	44.9841
m	263.4735
n	0.3008
Epoch	2460800.5

n_obs	4100
n_opp	26
Years observed	1979-2025
rms	0.64

Best values

	Value	Standard error
Parent

a_p	2.206
e_p	0.127
sin(i_p)	0.123
G	0.150
H	13.300
Mass
D
pV

	Value
Rotational Period	5.337
Period quality	3
Spectral Class	S
Spectral Class Score	37.330

Proper elements data

a_p	e_p	sin(i_p)	Author	Reference	Method
2.2060	0.1270	0.1235	Novakovic_Radovic_Todovic	2003A&A...403.1165K	Numeric-Nov-2024

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
13.30			MPC-2023-12-04	MPC-2023-12-04	Phot

Periods

Value	Quality	Side real or Synodic	Author	Reference	Method
5.33083	2	Sidereal	Hanus	2016A&A...586A.108H	Model
5.3379	3	Synodic	Oey	2007MPBu...34...81O	Lightcurve

Spectral Class Data

Class 1	Class 2	Probability of Class 1	Probability of Class 2	Taxonomy	Wavelength	Author	Reference	Method
A	S	0.5972	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
L	S	0.4846	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
S				Bus	VIS	Bus	2002Icar..158..146B	SPEC
S				DeMeo-Carry	VIS	DeMeo	2013Icar..226..723D	PHOT
S		0.96		Bus	VIS	Carvano	2010A&A...510A..43C	PHOT
S		0.990000		Mahlke	VIS	Mahlke	2022A&A...665A..26M	SPEC
S	S	0.6335	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
S	S	0.6444	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
S	S	0.6458	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
S	S	0.9899	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
S	S	0.9964	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
V	S	0.6041	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT
X	S	0.4547	0.4120	Bus-Demeo	VIS	Sergeyev	2021A&A...652A..59S	PHOT