Asteroids

2025WC4 help

Last update: 2026-05-07 13:00 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.811

Aphelion (Q)

2.273

Eccentricity (e)

0.474

Inclination (i)

26.9

deg

Orbit period (P)

699.2

Earth MOID

0.01295

U parameter

1.4

Next Earth close approach

Date

2026-06-21

Nominal distance (from Earth center)

0.02608

3901750

Maximum Brightness

15.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.2

mag

Diameter

240 - 500*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-11-24

Observatory

Pan-STARRS 1, Haleakala

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.541775

1-sigma variation

7.913E-8

Unit

Eccentricity (e)

Value

0.473954

1-sigma variation

3.495E-7

Unit

Inclination (i)

Value

26.8588

1-sigma variation

2.682E-5

Unit

Long. of Ascending Node (Ω)

Value

87.3063

1-sigma variation

2.168E-5

Unit

Arg. of Perihelion (ω)

Value

114.4104

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

18.10182

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.811045

1-sigma variation

Unit

Aphelion distance

Value

2.272506

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.502510

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.016486

1-sigma variation

Unit

MOID

Value

0.012947

1-sigma variation

Unit

Orbit Period

Value

699.2462

1-sigma variation

Unit

U parameter

Value

1.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.26142E-15	-2.21195E-14	-1.35814E-12	7.83975E-13	-4.73921E-12	2.01020E-12
e	-2.21195E-14	1.22139E-13	5.11810E-12	-2.78416E-12	1.89124E-11	-4.87614E-12
i	-1.35814E-12	5.11810E-12	7.19557E-10	-5.14326E-10	1.49914E-9	-6.73797E-10
Ω	7.83975E-13	-2.78416E-12	-5.14326E-10	4.69962E-10	-1.02976E-9	4.30702E-10
ω	-4.73921E-12	1.89124E-11	1.49914E-9	-1.02976E-9	4.45433E-9	-2.01448E-9
M	2.01020E-12	-4.87614E-12	-6.73797E-10	4.30702E-10	-2.01448E-9	1.50246E-9

Date of computation: 2026-05-07 13:00 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

20.225

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

240 - 500*

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

[-]

Download this part as:

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

1642

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.696669

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-11-07.447611

Unit

Source

[2]

Last Observation

Value

2026-05-07.16046

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

114 (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

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2025WC4 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1959-06-21 01:00	1.8	0.0186061	0.0185568	0.0000164
EARTH	1982-06-12 00:08	1.8	0.1254281	0.1253730	0.0000184
EARTH	2026-06-21 04:00	< 1 min	0.0260816	0.0260786	0.0000010
EARTH	2049-06-21 18:00	1.1	0.0397672	0.0397268	0.0000135
EARTH	2097-06-12 01:06	4.4	0.1180671	0.1179301	0.0000457
EARTH	2120-06-21 03:44	4.5	0.0216490	0.0215374	0.0000373

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
42.84709106	163.52523413	0.01294665	MINIMUM
302.31131694	9.14016486	0.28858338	MINIMUM
347.22531537	75.22627287	0.45320207	SADDLE
174.72240682	276.92226078	1.42733326	SADDLE
357.77863183	274.55826866	1.76768177	SADDLE
183.78853445	102.73937036	3.21479409	MAXIMUM

Download:

MOID Plots

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