Asteroids

2025OR4 help

Last update: 2025-07-29 08:29 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.943

Aphelion (Q)

1.352

Eccentricity (e)

0.178

Inclination (i)

1.4

deg

Orbit period (P)

449.1

Earth MOID

0.00460

U parameter

7.4

Next Earth close approach

Date

2025-08-12

Nominal distance (from Earth center)

0.00895

1338697

Maximum Brightness

19.1

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.6

mag

Diameter

13 - 29*

Taxonomic type

Rotation period (T)

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.147730

1-sigma variation

0.000311

Unit

Eccentricity (e)

Value

0.178115

1-sigma variation

0.000353

Unit

Inclination (i)

Value

1.3834

1-sigma variation

0.0036

Unit

Long. of Ascending Node (Ω)

Value

151.9544

1-sigma variation

0.0655

Unit

Arg. of Perihelion (ω)

Value

225.6497

1-sigma variation

0.0997

Unit

Mean Anomaly (M)

Value

238.73817

1-sigma variation

0.06286

Unit

Perihelion distance

Value

0.943302

1-sigma variation

Unit

Aphelion distance

Value

1.352158

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.279745

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.021897

1-sigma variation

Unit

MOID

Value

0.004596

1-sigma variation

Unit

Orbit Period

Value

449.1156

1-sigma variation

Unit

U parameter

Value

7.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.64878E-8	9.72819E-8	7.34229E-7	-2.21921E-6	1.25887E-6	1.90746E-5
e	9.72819E-8	1.24761E-7	1.19200E-6	-1.28586E-5	1.75273E-5	1.70377E-5
i	7.34229E-7	1.19200E-6	1.32541E-5	-1.97131E-4	2.85258E-4	1.08013E-4
Ω	-2.21921E-6	-1.28586E-5	-1.97131E-4	4.28961E-3	-6.51084E-3	4.33980E-4
ω	1.25887E-6	1.75273E-5	2.85258E-4	-6.51084E-3	9.93295E-3	-1.08761E-3
M	1.90746E-5	1.70377E-5	1.08013E-4	4.33980E-4	-1.08761E-3	3.95146E-3

Date of computation: 2025-07-29 08:29 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

26.555

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

13 - 29*

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

0.64541

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-07-26.35441

Unit

Source

[2]

Last Observation

Value

2025-07-28.905152

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

15 (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 2025OR4 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	1954-06-29 22:24	> 1 mo	0.1946496	0.0347290	0.0693553
EARTH	1954-11-18 04:19	> 1 mo	0.0362878	0.0187223	0.0721715
EARTH	1965-07-28 13:11	> 1 mo	0.1597740	0.0079100	0.5847866
EARTH	1971-12-09 03:50	> 1 mo	0.0855305	0.0234273	0.7036334
EARTH	1982-08-16 06:21	> 1 w	0.0111161	0.0063616	0.0323163
EARTH	1993-11-26 16:29	1346.6	0.0244866	0.0236682	0.0013288
EARTH	2009-09-30 21:00	> 1 mo	0.0575639	0.0517931	0.0031305
EARTH	2025-08-12 02:08	31.4	0.0089486	0.0088920	0.0000189
EARTH	2031-12-13 22:18	1032.0	0.1489206	0.0993619	0.0166469
EARTH	2042-07-30 17:48	> 1 d	0.1367647	0.0211963	0.0388069
EARTH	2048-12-01 17:41	> 1 d	0.0280926	0.0257399	0.0149581
EARTH	2059-08-02 08:52	> 1 w	0.1137640	0.0056373	0.2391123
EARTH	2065-12-12 15:26	> 1 w	0.1251729	0.0255587	0.2474940
EARTH	2076-08-12 04:33	> 1 w	0.0120158	0.0031625	0.0873102
EARTH	2082-08-25 14:11	> 1 mo	0.0321971	0.0047587	2.3009237
EARTH	2083-01-21 02:12	> 1 mo	0.1930313	0.0494307	1.6730818
EARTH	2088-07-02 01:16	> 1 mo	0.1859996	0.0172789	2.7936557
EARTH	2088-11-13 07:46	> 1 mo	0.0492774	0.0284554	2.2863912
EARTH	2094-12-10 08:37	> 1 mo	0.0646863	0.0260438	8.1391137
EARTH	2123-08-10 09:23	> 1 mo	0.0343287	0.0026855	17.8157805

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
311.71225602	219.52330107	0.00459594	MINIMUM
38.21358055	321.01456476	0.02377160	MINIMUM
356.13489641	271.72534380	0.05781018	SADDLE
176.43666544	91.69229491	0.35185454	SADDLE
354.56248620	89.84435828	1.94382206	SADDLE
176.13608622	271.44163251	2.35095017	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025OR4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS	TS
2093-08-14.506	85738.506	-0.316	0.000	1.59 ± 0.130	1.71E6	1.02E-6	1.24E-7	-7.04	0
2125-08-15.636	97426.636	-0.270	0.000	1.58 ± 0.196	4.61E6	3.81E-7	4.63E-8	-7.63	n/a


Based on 15 optical observations (of which 0 are rejected as outliers) from 2025/07/26.354 to 2025/07/28.905.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 2.79 and 2.79 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20250729 084101.503 UTC.

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Download Impactor Table as: