Asteroids

2025SO20 help

Last update: 2025-10-09 12:45 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.872

Aphelion (Q)

1.811

Eccentricity (e)

0.350

Inclination (i)

2.4

deg

Orbit period (P)

567.4

Earth MOID

0.00019

U parameter

6.4

Next Earth close approach

Date

2039-09-02

Nominal distance (from Earth center)

0.10921

16337528

Maximum Brightness

30.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.5

mag

Diameter

5 - 12*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-29

Observatory

Catalina Sky Survey

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

1.341254

1-sigma variation

0.000111

Unit

Eccentricity (e)

Value

0.350080

1-sigma variation

0.000069

Unit

Inclination (i)

Value

2.4145

1-sigma variation

0.0004

Unit

Long. of Ascending Node (Ω)

Value

5.4729

1-sigma variation

4.401E-5

Unit

Arg. of Perihelion (ω)

Value

299.5417

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

63.95132

1-sigma variation

0.00908

Unit

Perihelion distance

Value

0.871708

1-sigma variation

Unit

Aphelion distance

Value

1.810800

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.001234

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.423765

1-sigma variation

Unit

MOID

Value

0.000186

1-sigma variation

Unit

Orbit Period

Value

567.3680

1-sigma variation

Unit

U parameter

Value

6.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.23238E-8	7.66276E-9	4.40513E-8	1.87705E-9	-4.07188E-8	-1.00788E-6
e	7.66276E-9	4.76542E-9	2.74161E-8	1.13590E-9	-2.55719E-8	-6.26569E-7
i	4.40513E-8	2.74161E-8	1.58755E-7	5.79225E-9	-1.53667E-7	-3.59895E-6
Ω	1.87705E-9	1.13590E-9	5.79225E-9	1.93722E-9	3.33819E-9	-1.58134E-7
ω	-4.07188E-8	-2.55719E-8	-1.53667E-7	3.33819E-9	2.11168E-7	3.29574E-6
M	-1.00788E-6	-6.26569E-7	-3.59895E-6	-1.58134E-7	3.29574E-6	8.24429E-5

Date of computation: 2025-10-09 12:45 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

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

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

28.498

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

5 - 12*

Unit

Source

[2]

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

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.643593

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-29.402169

Unit

Source

[2]

Last Observation

Value

2025-10-01.387876

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

54 (1)

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 2025SO20 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	1963-05-29 15:55	> 1 d	0.0600091	0.0334806	0.0187367
EARTH	1968-07-19 17:19	> 1 d	0.1269987	0.1221761	0.0016193
EARTH	1973-09-23 15:54	1390.5	0.0307055	0.0136659	0.0056802
MARS	1976-07-03 14:18	59.0	0.0346573	0.0319027	0.0018024
EARTH	1978-10-10 19:13	572.2	0.1535288	0.1313217	0.0074024
EARTH	2010-05-24 10:42	709.8	0.1215803	0.0995032	0.0074264
EARTH	2015-06-15 17:59	> 1 d	0.0714525	0.0590929	0.0042534
EARTH	2020-08-10 18:44	> 1 d	0.1272438	0.1255931	0.0005511
EARTH	2025-09-28 06:46	< 1 min	0.0009150	0.0009144	0.0000002
EARTH	2039-09-02 18:47	> 1 d	0.1092096	0.0908629	0.0061234
EARTH	2053-07-19 22:17	> 1 w	0.1469458	0.1430353	0.0013314
EARTH	2067-06-06 17:11	> 1 d	0.0846519	0.0500086	0.0126155
EARTH	2081-05-22 01:11	886.6	0.0400913	0.0360607	0.0029318
EARTH	2084-10-06 16:03	628.8	0.0983366	0.0774556	0.0069605
EARTH	2095-05-13 04:20	229.7	0.1548867	0.1447310	0.0033920
EARTH	2098-09-25 22:19	366.3	0.0270388	0.0217838	0.0017523
MARS	2104-04-20 03:03	26.3	0.0394148	0.0291904	0.0036254
EARTH	2112-06-16 12:12	> 1 d	0.1075658	0.0753007	0.0110873
EARTH	2115-10-14 13:58	> 1 d	0.1974565	0.1323365	0.0217086

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
43.81282128	264.88720815	0.00018594	MINIMUM
313.76382198	139.84403217	0.03573703	MINIMUM
358.08602912	201.39043254	0.14928199	SADDLE
179.29851912	23.03001039	0.82731741	SADDLE
358.79679880	22.42049354	1.85629691	SADDLE
179.45659685	203.13199591	2.82707612	MAXIMUM

Download:

MOID Plots

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