Asteroids

2025WG4 help

Last update: 2025-11-29 13:15 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.554

Aphelion (Q)

5.769

Eccentricity (e)

0.825

Inclination (i)

33.0

deg

Orbit period (P)

2053.6

Earth MOID

0.00662

U parameter

9.0

Next Earth close approach

Date

2098-11-23

Nominal distance (from Earth center)

0.01258

1881460

Maximum Brightness

15.1

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

21.1

mag

Diameter

160 - 400*

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

3.161828

1-sigma variation

0.050337

Unit

Eccentricity (e)

Value

0.824696

1-sigma variation

0.002953

Unit

Inclination (i)

Value

32.9658

1-sigma variation

0.1131

Unit

Long. of Ascending Node (Ω)

Value

63.3402

1-sigma variation

0.0184

Unit

Arg. of Perihelion (ω)

Value

269.3694

1-sigma variation

0.0419

Unit

Mean Anomaly (M)

Value

8.00806

1-sigma variation

0.20587

Unit

Perihelion distance

Value

0.554280

1-sigma variation

Unit

Aphelion distance

Value

5.769376

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.033477

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.012009

1-sigma variation

Unit

MOID

Value

0.006616

1-sigma variation

Unit

Orbit Period

Value

2053.5521

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.53385E-3	1.48631E-4	5.69491E-3	9.23669E-4	2.10732E-3	-1.03629E-2
e	1.48631E-4	8.71839E-6	3.34059E-4	5.41818E-5	1.23601E-4	-6.07867E-4
i	5.69491E-3	3.34059E-4	1.28016E-2	2.07633E-3	4.73338E-3	-2.32909E-2
Ω	9.23669E-4	5.41818E-5	2.07633E-3	3.36765E-4	7.67711E-4	-3.77760E-3
ω	2.10732E-3	1.23601E-4	4.73338E-3	7.67711E-4	1.75652E-3	-8.61857E-3
M	-1.03629E-2	-6.07867E-4	-2.32909E-2	-3.77760E-3	-8.61857E-3	4.23821E-2

Date of computation: 2025-11-29 13:15 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

21.093

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

160 - 400*

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

0.623282

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-11-24.357138

Unit

Source

[2]

Last Observation

Value

2025-11-28.476041

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

85 (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 2025WG4 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	1997-11-20 23:12	> 1 mo	0.0903675	0.0105752	3.4925908
EARTH	2014-06-01 16:14	> 1 mo	0.1601618	0.0181436	1.6404446
EARTH	2025-11-19 08:39	< 1 min	0.1059131	0.1048660	0.0003490
EARTH	2098-11-23 02:03	> 1 mo	0.0125768	0.0110455	6.1666875

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
325.58603579	140.92499252	0.00661563	MINIMUM
33.88826485	321.29593424	0.01812082	MINIMUM
359.55961085	231.26959772	0.62419718	SADDLE
359.31898960	50.28517584	1.48582470	SADDLE
179.94677378	51.10359609	4.96811311	SADDLE
179.87774741	231.07469566	6.64098193	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2025WG4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2051-05-23.487	70314.487	-3.833	2.392	1.07 ± 0.743	7.96E4	3.18E-11	1.52E3	-7.84
2057-05-22.640	72505.640	-2.597	0.000	0.53 ± 0.747	1.08E5	1.68E-7	1.58E3	-4.20
2057-11-23.721	72690.721	-1.984	0.000	0.40 ± 0.164	5.95E6	1.95E-8	1.61E3	-5.13
2085-11-23.068	82917.068	-1.198	0.000	0.99 ± 0.049	2.03E5	1.31E-6	1.63E3	-3.57


Based on 85 optical observations (of which 0 are rejected as outliers) from 2025/11/24.357 to 2025/11/28.476.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.07 and 1.07 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251129 141113.381 UTC.

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Download Impactor Table as: