Asteroids

2025SW20 help

Last update: 2025-09-30 14:37 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.757

Aphelion (Q)

3.327

Eccentricity (e)

0.629

Inclination (i)

17.4

deg

Orbit period (P)

1065.6

Earth MOID

0.00411

U parameter

8.1

Next Earth close approach

Date

2031-04-26

Nominal distance (from Earth center)

0.19242

28786077

Maximum Brightness

25.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.6

mag

Diameter

13 - 28*

Taxonomic type

Rotation period (T)

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

2.041760

1-sigma variation

0.003838

Unit

Eccentricity (e)

Value

0.629458

1-sigma variation

0.000766

Unit

Inclination (i)

Value

17.4456

1-sigma variation

0.0156

Unit

Long. of Ascending Node (Ω)

Value

183.8777

1-sigma variation

1.406E-5

Unit

Arg. of Perihelion (ω)

Value

110.4242

1-sigma variation

0.0066

Unit

Mean Anomaly (M)

Value

33.67006

1-sigma variation

0.10203

Unit

Perihelion distance

Value

0.756559

1-sigma variation

Unit

Aphelion distance

Value

3.326962

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.581433

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.007979

1-sigma variation

Unit

MOID

Value

0.004105

1-sigma variation

Unit

Orbit Period

Value

1065.6278

1-sigma variation

Unit

U parameter

Value

8.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.47265E-5	2.93889E-6	5.99101E-5	-4.50428E-8	2.51892E-5	-3.91550E-4
e	2.93889E-6	5.86502E-7	1.19557E-5	-8.97671E-9	5.02594E-6	-7.81395E-5
i	5.99101E-5	1.19557E-5	2.43740E-4	-1.83904E-7	1.02528E-4	-1.59290E-3
Ω	-4.50428E-8	-8.97671E-9	-1.83904E-7	1.97635E-10	-8.01450E-8	1.19780E-6
ω	2.51892E-5	5.02594E-6	1.02528E-4	-8.01450E-8	4.33196E-5	-6.69747E-4
M	-3.91550E-4	-7.81395E-5	-1.59290E-3	1.19780E-6	-6.69747E-4	1.04106E-2

Date of computation: 2025-09-30 14:37 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

26.629

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

13 - 28*

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

0.638857

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-27.216836

Unit

Source

[2]

Last Observation

Value

2025-09-30.303287

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

16 (0)

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 2025SW20 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	1961-10-07 00:55	> 1 mo	0.1907465	0.0033929	1.4339063
EARTH	1967-04-29 13:34	> 1 mo	0.1859786	0.1811851	0.2379284
EARTH	1993-09-29 19:11	> 1 mo	0.0535142	0.0045098	0.5299557
EARTH	2025-09-26 11:09	< 1 min	0.0044116	0.0043984	0.0000044
EARTH	2031-04-26 12:38	> 1 d	0.1924230	0.1896810	0.0172195
EARTH	2063-09-28 18:00	> 1 mo	0.0493761	0.0053633	0.6130624
EARTH	2107-10-05 08:03	> 1 mo	0.1530414	0.0042098	3.4736913

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
36.23448257	262.91642272	0.00410502	MINIMUM
318.94704652	114.62461094	0.18706467	MINIMUM
354.72090220	182.45493818	0.36744949	SADDLE
358.58271025	11.06788590	1.72284933	SADDLE
179.04187235	13.34826844	2.39870895	SADDLE
180.42420329	194.02503076	4.31315932	MAXIMUM

Download:

MOID Plots

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