Asteroids

2025UN8 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.991

Aphelion (Q)

4.009

Eccentricity (e)

0.604

Inclination (i)

1.9

deg

Orbit period (P)

1443.9

Earth MOID

0.00360

U parameter

7.8

Next Earth close approach

Date

2029-08-24

Nominal distance (from Earth center)

0.16026

23974621

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.5

mag

Diameter

5 - 12*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-10-28

Observatory

Mt. Lemmon 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.500129

1-sigma variation

0.004325

Unit

Eccentricity (e)

Value

0.603576

1-sigma variation

0.000688

Unit

Inclination (i)

Value

1.8796

1-sigma variation

0.0015

Unit

Long. of Ascending Node (Ω)

Value

213.3424

1-sigma variation

4.835E-5

Unit

Arg. of Perihelion (ω)

Value

163.6929

1-sigma variation

0.0035

Unit

Mean Anomaly (M)

Value

59.36373

1-sigma variation

0.15405

Unit

Perihelion distance

Value

0.991110

1-sigma variation

Unit

Aphelion distance

Value

4.009148

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.769573

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.012063

1-sigma variation

Unit

MOID

Value

0.003597

1-sigma variation

Unit

Orbit Period

Value

1443.9167

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.87056E-5	2.97490E-6	6.57406E-6	-7.48125E-8	-1.49962E-5	-6.66250E-4
e	2.97490E-6	4.73120E-7	1.04552E-6	-1.18964E-8	-2.38500E-6	-1.05959E-4
i	6.57406E-6	1.04552E-6	2.31114E-6	-2.52304E-8	-5.27156E-6	-2.34152E-4
Ω	-7.48125E-8	-1.18964E-8	-2.52304E-8	2.33814E-9	5.64891E-8	2.66491E-6
ω	-1.49962E-5	-2.38500E-6	-5.27156E-6	5.64891E-8	1.20634E-5	5.34122E-4
M	-6.66250E-4	-1.05959E-4	-2.34152E-4	2.66491E-6	5.34122E-4	2.37302E-2

Date of computation: 2026-03-17 23:26 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

28.478

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

5 - 12*

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

160

Unit

Source

[1]

Normalized RMS of residuals

Value

0.569613

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-10-27.227503

Unit

Source

[2]

Last Observation

Value

2025-11-01.42574

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

29 (3)

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 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2025UN8 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	1950-11-07 21:55	> 1 mo	0.1650319	0.0058690	1.3723042
EARTH	1954-10-25 03:53	> 1 mo	0.0768262	0.0156808	0.7376135
EARTH	1958-10-02 00:40	> 1 mo	0.0422473	0.0111832	0.1526299
EARTH	1962-09-01 10:36	> 1 mo	0.1848976	0.0195594	0.6674552
EARTH	2025-10-25 16:26	< 1 min	0.0110360	0.0110025	0.0000112
EARTH	2029-08-24 18:23	> 1 d	0.1602604	0.0250948	0.0597847
EARTH	2080-11-14 13:49	> 1 mo	0.0681805	0.0056597	0.5845552
EARTH	2084-08-23 19:52	> 1 w	0.1307436	0.0266617	0.2541358

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
5.04396084	286.81310085	0.00383240	MINIMUM
358.66782071	94.06782307	1.99356461	SADDLE
179.66668959	95.33392287	3.00637354	SADDLE
179.67955806	275.34111650	5.00769580	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2025UN8

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2111-10-27.951	92385.951	-3.777	0.000	0.19 ± 0.000	7.64E6	1.33E-10	1.17E-2	-11.83	0


Based on 29 optical observations (of which 3 are rejected as outliers) from 2025/10/27.228 to 2025/11/01.426.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.61 and 1.61 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251101 133126.492 UTC.

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Download Impactor Table as: