Asteroids

2025KY4 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

1.006

Aphelion (Q)

1.303

Eccentricity (e)

0.129

Inclination (i)

4.8

deg

Orbit period (P)

453.3

Earth MOID

0.01751

U parameter

6.2

Next Earth close approach

Date

2056-07-08

Nominal distance (from Earth center)

0.06967

10422002

Maximum Brightness

24.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.9

mag

Diameter

11 - 25*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-05-27

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

1.154804

1-sigma variation

0.000054

Unit

Eccentricity (e)

Value

0.128656

1-sigma variation

0.000043

Unit

Inclination (i)

Value

4.8167

1-sigma variation

0.0013

Unit

Long. of Ascending Node (Ω)

Value

245.8025

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

44.3032

1-sigma variation

0.0012

Unit

Mean Anomaly (M)

Value

106.39166

1-sigma variation

0.00642

Unit

Perihelion distance

Value

1.006232

1-sigma variation

Unit

Aphelion distance

Value

1.303376

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.025038

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.264280

1-sigma variation

Unit

MOID

Value

0.017514

1-sigma variation

Unit

Orbit Period

Value

453.2738

1-sigma variation

Unit

U parameter

Value

6.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.96849E-9	2.32506E-9	7.07697E-8	1.94597E-8	-6.31663E-8	-3.49521E-7
e	2.32506E-9	1.82111E-9	5.54293E-8	1.52416E-8	-4.94641E-8	-2.73769E-7
i	7.07697E-8	5.54293E-8	1.68727E-6	4.63954E-7	-1.50641E-6	-8.33234E-6
Ω	1.94597E-8	1.52416E-8	4.63954E-7	1.27608E-7	-4.14157E-7	-2.29123E-6
ω	-6.31663E-8	-4.94641E-8	-1.50641E-6	-4.14157E-7	1.35220E-6	7.43160E-6
M	-3.49521E-7	-2.73769E-7	-8.33234E-6	-2.29123E-6	7.43160E-6	4.11581E-5

Date of computation: 2025-11-24 16:53 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

26.907

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

11 - 25*

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

178

Unit

Source

[1]

Normalized RMS of residuals

Value

0.727654

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-05-27.296852

Unit

Source

[2]

Last Observation

Value

2025-06-12.35693

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

41 (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 2025KY4 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	1979-08-27 17:21	1419.3	0.1748862	0.1262726	0.0173857
EARTH	1984-06-22 19:19	> 1 d	0.0533863	0.0353506	0.0060122
EARTH	1989-05-29 18:54	1303.6	0.0498970	0.0256472	0.0085288
EARTH	1989-09-30 12:19	> 1 w	0.1632875	0.1491253	0.0051139
EARTH	2020-04-26 15:16	> 1 d	0.1829372	0.1779145	0.0016832
EARTH	2020-08-21 00:05	272.7	0.1255763	0.1209215	0.0015769
EARTH	2025-06-05 06:31	< 1 min	0.0185297	0.0185150	0.0000049
EARTH	2056-07-08 09:51	> 1 d	0.0696668	0.0505913	0.0067305
EARTH	2061-05-26 10:57	944.4	0.0880423	0.0606545	0.0091786
EARTH	2061-10-15 01:26	> 1 w	0.1842236	0.1710039	0.0046578
EARTH	2092-07-04 04:48	> 1 w	0.0664672	0.0237422	0.0225364
EARTH	2097-05-27 13:33	> 1 d	0.0758140	0.0152396	0.0298703
EARTH	2097-10-11 23:29	> 1 w	0.1778570	0.1406110	0.0161117

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
327.90145138	152.05949030	0.01751421	MINIMUM
183.60810971	11.71585518	0.32677381	SADDLE
359.67122317	8.46653807	1.98911753	SADDLE
178.55625335	187.33064518	2.32041247	MAXIMUM

Download:

MOID Plots

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