Asteroids

2015SO2 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.886

Aphelion (Q)

1.102

Eccentricity (e)

0.109

Inclination (i)

9.2

deg

Orbit period (P)

362.1

Earth MOID

0.01804

U parameter

1.5

Next Earth close approach

Date

2123-04-21

Nominal distance (from Earth center)

0.16729

25026084

Maximum Brightness

23.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.7

mag

Diameter

50 - 110*

Taxonomic type

Rotation period (T)

0.5800

Discovery Information

Discovery Date

2015-09-21

Observatory

Crni Vrh

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.994150

1-sigma variation

3.225E-8

Unit

Eccentricity (e)

Value

0.108850

1-sigma variation

0.000001

Unit

Inclination (i)

Value

9.1675

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

182.7001

1-sigma variation

2.218E-5

Unit

Arg. of Perihelion (ω)

Value

291.8806

1-sigma variation

4.343E-5

Unit

Mean Anomaly (M)

Value

341.71979

1-sigma variation

0.00011

Unit

Perihelion distance

Value

0.885937

1-sigma variation

Unit

Aphelion distance

Value

1.102364

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.053890

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.020749

1-sigma variation

Unit

MOID

Value

0.018041

1-sigma variation

Unit

Orbit Period

Value

362.0567

1-sigma variation

Unit

U parameter

Value

1.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.03987E-15	2.33753E-14	2.36847E-12	6.63688E-13	7.60983E-13	-2.92099E-12
e	2.33753E-14	5.83677E-13	4.90535E-11	1.45137E-11	9.74775E-12	-5.26344E-11
i	2.36847E-12	4.90535E-11	5.79890E-9	1.55603E-9	2.18413E-9	-7.44720E-9
Ω	6.63688E-13	1.45137E-11	1.55603E-9	4.91832E-10	4.67618E-10	-1.95306E-9
ω	7.60983E-13	9.74775E-12	2.18413E-9	4.67618E-10	1.88584E-9	-4.00391E-9
M	-2.92099E-12	-5.26344E-11	-7.44720E-9	-1.95306E-9	-4.00391E-9	1.15329E-8

Date of computation: 2025-09-10 00:30 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

0.5800

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

1.65

Unit

mag

Source

[1]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

23.7

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

50 - 110*

Unit

Source

[3]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Thirouin, A.; Moskovitz, N.; Binzel, R.P.; Christensen, E.; et al. (2016) Astron. J. 152, A163.
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

1079

Unit

Source

[1]

Unobserved

Value

2588

Unit

Source

[1]

Normalized RMS of residuals

Value

0.464832

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-09-21.03625

Unit

Source

[2]

Last Observation

Value

2018-09-04.377078

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

106 (5)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Close Approaches for 2015SO2 from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	2010-09-28 16:57	< 1 min	0.1782511	0.1782446	0.0000022
EARTH	2011-09-30 03:36	< 1 min	0.1341364	0.1341313	0.0000017
EARTH	2012-09-30 00:08	< 1 min	0.0948838	0.0948802	0.0000012
EARTH	2013-09-30 13:06	< 1 min	0.0632852	0.0632832	0.0000007
EARTH	2014-09-30 15:54	< 1 min	0.0430871	0.0430867	0.0000001
EARTH	2015-09-30 18:20	< 1 min	0.0368473	0.0368464	0.0000003
EARTH	2016-09-30 00:20	< 1 min	0.0446486	0.0446473	0.0000004
EARTH	2017-09-30 03:17	< 1 min	0.0662541	0.0662530	0.0000004
EARTH	2018-09-29 23:37	< 1 min	0.0987181	0.0987173	0.0000003
EARTH	2019-09-29 12:07	< 1 min	0.1379951	0.1379939	0.0000004
EARTH	2020-09-27 11:24	< 1 min	0.1818357	0.1818337	0.0000007
EARTH	2123-04-21 12:41	2.1	0.1672890	0.1672219	0.0000224
EARTH	2124-04-16 19:20	2.4	0.1280408	0.1279810	0.0000199
EARTH	2125-04-13 02:07	2.7	0.0945944	0.0945456	0.0000163

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
257.49872808	264.67516996	0.01866282	MINIMUM
70.28171798	87.52353203	0.04703805	MINIMUM
344.83688805	355.58572781	0.17601313	SADDLE
162.96415709	177.07449836	0.18631245	SADDLE
359.59157639	191.90015494	1.89676245	SADDLE
184.79273239	17.16656668	2.08101937	MAXIMUM

Download:

MOID Plots

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