Asteroids

2025UN help

Last update: 2025-10-19 13:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.838

Aphelion (Q)

1.782

Eccentricity (e)

0.360

Inclination (i)

1.7

deg

Orbit period (P)

547.4

Earth MOID

0.00114

U parameter

6.6

Next Earth close approach

Date

2028-10-15

Nominal distance (from Earth center)

0.01509

2257217

Maximum Brightness

23.3

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.7

mag

Diameter

5 - 11*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-10-17

Observatory

Palomar Mountain--ZTF

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

1.309546

1-sigma variation

0.000131

Unit

Eccentricity (e)

Value

0.360430

1-sigma variation

0.000087

Unit

Inclination (i)

Value

1.6812

1-sigma variation

0.0004

Unit

Long. of Ascending Node (Ω)

Value

25.5236

1-sigma variation

3.371E-5

Unit

Arg. of Perihelion (ω)

Value

291.0602

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

56.25864

1-sigma variation

0.01019

Unit

Perihelion distance

Value

0.837546

1-sigma variation

Unit

Aphelion distance

Value

1.781546

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.012113

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.304686

1-sigma variation

Unit

MOID

Value

0.001135

1-sigma variation

Unit

Orbit Period

Value

547.3682

1-sigma variation

Unit

U parameter

Value

6.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.71162E-8	1.13768E-8	4.65263E-8	2.75733E-9	-6.26689E-8	-1.33378E-6
e	1.13768E-8	7.56263E-9	3.08962E-8	1.84379E-9	-4.18091E-8	-8.86503E-7
i	4.65263E-8	3.08962E-8	1.30481E-7	5.92762E-9	-1.63167E-7	-3.62669E-6
Ω	2.75733E-9	1.84379E-9	5.92762E-9	1.13638E-9	-1.29680E-8	-2.14406E-7
ω	-6.26689E-8	-4.18091E-8	-1.63167E-7	-1.29680E-8	2.65655E-7	4.87518E-6
M	-1.33378E-6	-8.86503E-7	-3.62669E-6	-2.14406E-7	4.87518E-6	1.03937E-4

Date of computation: 2025-10-19 13:53 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

28.695

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

5 - 11*

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

0.630675

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-10-17.311444

Unit

Source

[2]

Last Observation

Value

2025-10-18.89916

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

72 (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 2025UN 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	1951-10-26 11:13	> 1 w	0.1402933	0.0003456	0.2663399
EARTH	1954-09-29 10:51	> 1 w	0.1042191	0.0007076	0.0445560
EARTH	1957-07-28 13:01	> 1 mo	0.1796117	0.1433524	0.0122664
EARTH	1960-05-29 07:08	> 1 mo	0.0388775	0.0095861	0.3303014
EARTH	1963-05-13 18:49	> 1 w	0.1896236	0.0089839	0.3249597
MARS	1968-11-25 16:56	> 1 w	0.0326500	0.0311660	0.0427948
EARTH	1991-10-14 10:22	> 1 d	0.0269308	0.0011528	0.0174193
EARTH	1994-08-13 12:05	> 1 w	0.1796971	0.1737256	0.0019919
EARTH	1997-06-07 18:55	> 1 d	0.0907469	0.0347045	0.0188311
EARTH	2000-05-14 08:07	> 1 d	0.1650651	0.1015513	0.0211912
EARTH	2025-10-16 17:38	< 1 min	0.0011499	0.0011491	0.0000003
EARTH	2028-10-15 00:20	405.7	0.0150886	0.0068485	0.0027557
EARTH	2031-09-30 07:48	> 1 d	0.1015603	0.0783141	0.0077494
EARTH	2034-09-04 04:11	> 1 w	0.1573601	0.1337508	0.0078802
EARTH	2037-08-11 11:52	> 1 w	0.1786911	0.1722008	0.0021795
EARTH	2040-07-19 20:22	> 1 w	0.1712320	0.1458056	0.0085070
EARTH	2043-06-25 11:19	> 1 w	0.1333698	0.0479704	0.0289553
MARS	2046-01-10 19:54	> 1 d	0.0199747	0.0164784	0.0181874
EARTH	2046-06-03 21:27	> 1 w	0.0638561	0.0184105	0.0479083
EARTH	2049-05-26 09:22	> 1 d	0.0216615	0.0193407	0.0234948
EARTH	2052-05-18 19:02	> 1 d	0.1179121	0.0194005	0.1221573
MARS	2073-11-03 04:40	> 1 w	0.0258245	0.0049836	0.3270213
EARTH	2107-10-25 15:53	> 1 w	0.0939187	0.0002265	0.2642133
EARTH	2110-10-18 08:49	> 1 w	0.0028544	0.0003297	0.2632273
EARTH	2113-06-21 18:14	> 1 mo	0.1330424	0.0167085	22.7379490

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
48.54935278	282.91652875	0.00113520	MINIMUM
308.43518821	144.36449562	0.01953397	MINIMUM
358.07404699	213.13008673	0.17940521	SADDLE
179.14629249	34.38715427	0.79578112	SADDLE
358.31258788	33.46502213	1.82389201	SADDLE
179.18914412	214.40740080	2.79631634	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025UN

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2075-10-17.403	79227.403	4.390	0.000	0.52 ± 0.004	5.76E5	1.28E-10	9.92E-3	-11.67
2094-10-17.875	86167.875	4.427	0.000	0.97 ± 0.002	1.58E5	4.09E-10	9.92E-3	-11.31
2113-10-18.269	93107.269	0.211	0.000	1.50 ± 0.013	3.03E4	2.41E-6	9.87E-3	-7.64
2113-10-18.356	93107.356	4.561	0.000	1.13 ± 0.001	2.32E5	1.04E-10	9.91E-3	-12.01
2113-10-18.377	93107.377	4.545	0.000	1.32 ± 0.001	1.57E5	2.30E-10	9.92E-3	-11.66
2119-10-18.706	95298.706	0.836	2.575	1.50 ± 0.018	4.71E4	5.59E-9	9.54E-3	-10.32
2120-10-18.505	95664.505	1.287	0.000	1.10 ± 0.001	5.06E6	7.17E-8	9.88E-3	-9.20
2121-10-18.245	96029.245	0.236	0.000	0.30 ± 0.000	7.71E7	1.50E-8	9.87E-3	-9.89
2121-10-18.307	96029.307	0.238	0.000	1.11 ± 0.027	1.05E8	7.53E-9	9.87E-3	-10.19
2123-10-18.921	96759.921	0.003	0.000	0.67 ± 0.004	3.36E7	3.28E-8	9.87E-3	-9.56
2123-10-18.970	96759.970	3.937	0.000	1.12 ± 0.000	2.15E7	1.60E-11	9.89E-3	-12.87
2123-10-19.297	96760.297	2.313	0.000	0.91 ± 0.000	1.19E6	5.50E-8	9.91E-3	-9.33
2124-10-18.019	97125.019	4.038	0.000	1.36 ± 0.001	2.60E6	5.81E-11	9.93E-3	-12.31
2124-10-18.388	97125.388	0.976	0.000	0.39 ± 0.016	4.21E7	1.71E-8	9.89E-3	-9.84
2125-10-18.359	97490.359	-1.826	0.000	1.11 ± 0.001	3.42E3	4.46E-5	9.86E-3	-6.43
2125-10-18.362	97490.362	-1.888	0.000	0.54 ± 0.001	7.17E3	2.74E-5	9.87E-3	-6.64


Based on 72 optical observations (of which 0 are rejected as outliers) from 2025/10/17.311 to 2025/10/18.899.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.50 and 1.50 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251019 143309.297 UTC.

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