Asteroids

2025OU4 help

Last update: 2026-07-30 14:25 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.718

Aphelion (Q)

1.528

Eccentricity (e)

0.361

Inclination (i)

12.9

deg

Orbit period (P)

434.6

Earth MOID

0.00442

U parameter

6.9

Next Earth close approach

Date

2027-02-09

Nominal distance (from Earth center)

0.14697

21986516

Maximum Brightness

25.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.8

mag

Diameter

12 - 26*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-07-27

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

1.122801

1-sigma variation

0.000154

Unit

Eccentricity (e)

Value

0.360561

1-sigma variation

0.000147

Unit

Inclination (i)

Value

12.8587

1-sigma variation

0.0057

Unit

Long. of Ascending Node (Ω)

Value

306.6015

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

97.3654

1-sigma variation

0.0048

Unit

Mean Anomaly (M)

Value

204.48443

1-sigma variation

0.03246

Unit

Perihelion distance

Value

0.717962

1-sigma variation

Unit

Aphelion distance

Value

1.527639

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.008569

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.050998

1-sigma variation

Unit

MOID

Value

0.004422

1-sigma variation

Unit

Orbit Period

Value

434.5626

1-sigma variation

Unit

U parameter

Value

6.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.35764E-8	2.25721E-8	8.69886E-7	1.26627E-8	-7.31626E-7	-4.98405E-6
e	2.25721E-8	2.16109E-8	8.32836E-7	1.21242E-8	-7.00429E-7	-4.77175E-6
i	8.69886E-7	8.32836E-7	3.20963E-5	4.67196E-7	-2.69940E-5	-1.83894E-4
Ω	1.26627E-8	1.21242E-8	4.67196E-7	6.80709E-9	-3.92864E-7	-2.67688E-6
ω	-7.31626E-7	-7.00429E-7	-2.69940E-5	-3.92864E-7	2.27074E-5	1.54666E-4
M	-4.98405E-6	-4.77175E-6	-1.83894E-4	-2.67688E-6	1.54666E-4	1.05363E-3

Date of computation: 2026-07-30 14:25 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

26.799

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

12 - 26*

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

380

Unit

Source

[1]

Normalized RMS of residuals

Value

0.759529

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-07-27.45095

Unit

Source

[2]

Last Observation

Value

2025-07-30.962431

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

42 (7)

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

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 2025OU4 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	1951-08-03 16:49	> 1 d	0.0751843	0.0005163	0.0669926
EARTH	1957-07-25 11:18	> 1 d	0.1098642	0.0021648	0.1292295
EARTH	1959-02-04 20:14	> 1 w	0.0722468	0.0246970	0.1340765
EARTH	1965-01-24 10:55	> 1 w	0.1137929	0.0298645	0.1324399
EARTH	1988-08-06 06:37	494.5	0.1367973	0.1109560	0.0086142
EARTH	1994-07-29 04:29	> 1 d	0.0397063	0.0040616	0.0274575
EARTH	1996-02-08 16:45	> 1 d	0.1360737	0.0525484	0.0289629
EARTH	2002-01-26 22:43	> 1 d	0.0884108	0.0280537	0.0275658
EARTH	2025-07-30 20:07	< 1 s	0.0046819	0.0046760	0.0000020
EARTH	2027-02-09 17:03	77.9	0.1469708	0.1431517	0.0012739
EARTH	2033-01-18 12:23	> 1 d	0.1694108	0.1443242	0.0084267
EARTH	2050-07-27 06:20	> 1 d	0.0858902	0.0049927	0.0277023
EARTH	2052-02-05 11:04	> 1 d	0.0602127	0.0293101	0.0243523
EARTH	2069-08-07 07:56	340.2	0.1502602	0.1346124	0.0052162
EARTH	2075-07-24 19:20	1003.7	0.1489792	0.1019804	0.0156696
EARTH	2077-02-01 14:27	> 1 d	0.0300366	0.0294943	0.0036062
EARTH	2094-08-04 15:41	> 1 d	0.0914617	0.0041848	0.1371403
EARTH	2100-07-22 19:40	> 1 d	0.1988706	0.0028360	0.1413723
EARTH	2102-01-30 19:12	> 1 w	0.0629751	0.0309901	0.1287184
EARTH	2119-08-02 14:51	1423.9	0.0214932	0.0065605	0.0218262
EARTH	2121-02-12 07:28	208.7	0.1855993	0.1743049	0.0037935

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
285.03969549	203.51310165	0.00442249	MINIMUM
67.83204142	27.83824372	0.02825238	MINIMUM
355.69483557	294.54716548	0.33318974	SADDLE
177.34584446	117.31297515	0.58847238	SADDLE
356.60169615	115.90677209	1.71532127	SADDLE
178.90328546	298.42259970	2.50469663	MAXIMUM

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MOID Plots

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