Asteroids

2025YK4 help

Last update: 2025-12-27 13:31 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.841

Aphelion (Q)

1.839

Eccentricity (e)

0.373

Inclination (i)

17.5

deg

Orbit period (P)

566.6

Earth MOID

0.00122

U parameter

7.1

Next Earth close approach

Date

2057-12-05

Nominal distance (from Earth center)

0.17447

26101045

Maximum Brightness

25.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

17 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-12-22

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

1.340006

1-sigma variation

0.000297

Unit

Eccentricity (e)

Value

0.372658

1-sigma variation

0.000166

Unit

Inclination (i)

Value

17.4695

1-sigma variation

0.0064

Unit

Long. of Ascending Node (Ω)

Value

88.9980

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

297.2612

1-sigma variation

0.0025

Unit

Mean Anomaly (M)

Value

10.77081

1-sigma variation

0.00755

Unit

Perihelion distance

Value

0.840642

1-sigma variation

Unit

Aphelion distance

Value

1.839371

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.001686

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.373776

1-sigma variation

Unit

MOID

Value

0.001220

1-sigma variation

Unit

Orbit Period

Value

566.5768

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.79973E-8	4.92020E-8	1.90056E-6	7.12441E-9	7.36491E-7	-2.23850E-6
e	4.92020E-8	2.75112E-8	1.06278E-6	3.95241E-9	4.11581E-7	-1.25152E-6
i	1.90056E-6	1.06278E-6	4.10742E-5	1.46432E-7	1.58725E-5	-4.83305E-5
Ω	7.12441E-9	3.95241E-9	1.46432E-7	3.37505E-9	6.86753E-8	-1.86171E-7
ω	7.36491E-7	4.11581E-7	1.58725E-5	6.86753E-8	6.22216E-6	-1.87595E-5
M	-2.23850E-6	-1.25152E-6	-4.83305E-5	-1.86171E-7	-1.87595E-5	5.69546E-5

Date of computation: 2025-12-27 13:31 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

25.977

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

17 - 40*

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

0.485901

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-22.258896

Unit

Source

[2]

Last Observation

Value

2025-12-26.53251

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

53 (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 2025YK4 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	1977-07-22 12:15	640.2	0.1987841	0.1970844	0.0068857
EARTH	1980-12-24 11:19	> 1 d	0.0682247	0.0007686	0.0727374
EARTH	1994-12-07 08:12	> 1 d	0.1611480	0.0217788	0.0561361
EARTH	2025-12-20 16:33	< 1 min	0.0023831	0.0023803	0.0000009
EARTH	2057-12-05 19:12	> 1 d	0.1744747	0.0285099	0.0625180
EARTH	2060-12-26 14:13	> 1 d	0.1025691	0.0029539	0.0696535
EARTH	2086-07-21 07:10	240.8	0.1949873	0.1949696	0.0003317
EARTH	2092-12-19 03:28	> 1 d	0.0251508	0.0006367	0.0170172

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
44.66142240	347.73919228	0.00121957	MINIMUM
296.02571365	198.57670371	0.19864974	MINIMUM
344.23422659	263.20667889	0.31572415	SADDLE
173.29265081	100.84500574	0.91443089	SADDLE
354.64220815	99.11387370	1.82724252	SADDLE
180.64859317	285.98845690	2.81188164	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2025YK4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2070-12-21.200	77466.200	-1.467	0.15 ± 0.002	3.63E6	9.68E-8	5.76E-1	-7.34
2080-12-20.711	81118.711	2.811	0.52 ± 0.002	1.54E5	1.19E-7	5.80E-1	-7.33
2086-12-21.227	83310.227	-4.795	0.12 ± 0.032	1.03E6	1.02E-11	5.73E-1	-11.45
2086-12-21.228	83310.228	-1.305	0.90 ± 0.005	1.17E5	3.76E-6	5.77E-1	-5.88


Based on 53 optical observations (of which 0 are rejected as outliers) from 2025/12/22.259 to 2025/12/26.533.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.30 and 1.30 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251227 140704.503 UTC.

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Download Impactor Table as: