Asteroids

2025WK4 help

Last update: 2025-12-30 12:45 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.984

Aphelion (Q)

2.056

Eccentricity (e)

0.353

Inclination (i)

5.3

deg

Orbit period (P)

684.6

Earth MOID

0.01378

U parameter

6.5

Next Earth close approach

Date

2041-01-25

Nominal distance (from Earth center)

0.15174

22699707

Maximum Brightness

23.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.2

mag

Diameter

24 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-11-25

Observatory

Pan-STARRS 2, 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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.520144

1-sigma variation

0.000156

Unit

Eccentricity (e)

Value

0.352714

1-sigma variation

0.000066

Unit

Inclination (i)

Value

5.3369

1-sigma variation

0.0008

Unit

Long. of Ascending Node (Ω)

Value

245.3746

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

203.3520

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

344.80820

1-sigma variation

0.00249

Unit

Perihelion distance

Value

0.983968

1-sigma variation

Unit

Aphelion distance

Value

2.056320

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.953920

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.018651

1-sigma variation

Unit

MOID

Value

0.013779

1-sigma variation

Unit

Orbit Period

Value

684.5822

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.41976E-8	1.02907E-8	1.28639E-7	-5.22823E-8	2.33506E-8	3.87699E-7
e	1.02907E-8	4.37640E-9	5.47073E-8	-2.22345E-8	9.93080E-9	1.64879E-7
i	1.28639E-7	5.47073E-8	6.83934E-7	-2.77975E-7	1.24181E-7	2.06107E-6
Ω	-5.22823E-8	-2.22345E-8	-2.77975E-7	1.13049E-7	-5.05409E-8	-8.37674E-7
ω	2.33506E-8	9.93080E-9	1.24181E-7	-5.05409E-8	2.29630E-8	3.73971E-7
M	3.87699E-7	1.64879E-7	2.06107E-6	-8.37674E-7	3.73971E-7	6.21185E-6

Date of computation: 2025-12-30 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

25.227

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

24 - 50*

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

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.533682

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-11-15.14807

Unit

Source

[2]

Last Observation

Value

2025-12-30.25822

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

44 (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

Note: Ephemerides requests are limited to a maximum of 100 points and a final date not exceeding 2080/07/22 14:12.

Close Approaches for 2025WK4 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	1967-12-06 02:55	> 1 d	0.0153112	0.0125647	0.0030029
EARTH	1982-11-05 11:51	1308.1	0.1946024	0.1489703	0.0152193
EARTH	2011-01-07 06:36	> 1 d	0.0731274	0.0502153	0.0089095
EARTH	2025-12-10 00:08	< 1 min	0.0226647	0.0226528	0.0000040
EARTH	2041-01-25 02:34	> 1 d	0.1517382	0.1155236	0.0125487
EARTH	2072-11-25 19:13	> 1 d	0.0301613	0.0117413	0.0164086
EARTH	2087-11-10 02:06	> 1 w	0.1554263	0.0057788	0.1237116
EARTH	2116-02-01 06:57	> 1 w	0.1880851	0.0715421	0.2069316

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
347.50976042	329.91435811	0.01377876	MINIMUM
180.18678712	167.35402701	1.03995248	SADDLE
359.63030378	167.03012718	2.00136527	SADDLE
179.56298989	346.92396056	3.03984663	MAXIMUM

Download:

MOID Plots

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