Asteroids

2025UX18 help

Last update: 2025-11-03 00:45 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.745

Aphelion (Q)

1.115

Eccentricity (e)

0.199

Inclination (i)

6.8

deg

Orbit period (P)

327.6

Earth MOID

0.00004

U parameter

6.3

Next Earth close approach

Date

2027-02-28

Nominal distance (from Earth center)

0.16788

25114872

Maximum Brightness

29.8

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

30.3

mag

Diameter

2.3 - 5*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-10-31

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.930113

1-sigma variation

0.000036

Unit

Eccentricity (e)

Value

0.198771

1-sigma variation

0.000113

Unit

Inclination (i)

Value

6.8349

1-sigma variation

0.0038

Unit

Long. of Ascending Node (Ω)

Value

216.5844

1-sigma variation

0.0014

Unit

Arg. of Perihelion (ω)

Value

59.6601

1-sigma variation

0.0072

Unit

Mean Anomaly (M)

Value

123.22178

1-sigma variation

0.00855

Unit

Perihelion distance

Value

0.745234

1-sigma variation

Unit

Aphelion distance

Value

1.114993

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.196192

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.000079

1-sigma variation

Unit

MOID

Value

0.000040

1-sigma variation

Unit

Orbit Period

Value

327.6440

1-sigma variation

Unit

U parameter

Value

6.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.27060E-9	-3.64576E-9	-1.20855E-7	-4.79400E-8	2.45238E-7	1.31820E-7
e	-3.64576E-9	1.27493E-8	4.31716E-7	1.28511E-7	-6.02602E-7	-7.46762E-7
i	-1.20855E-7	4.31716E-7	1.46509E-5	4.22466E-6	-1.95752E-5	-2.62177E-5
Ω	-4.79400E-8	1.28511E-7	4.22466E-6	1.84794E-6	-9.65219E-6	-3.52093E-6
ω	2.45238E-7	-6.02602E-7	-1.95752E-5	-9.65219E-6	5.17971E-5	9.16631E-6
M	1.31820E-7	-7.46762E-7	-2.62177E-5	-3.52093E-6	9.16631E-6	7.30288E-5

Date of computation: 2025-11-03 00:45 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

30.281

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

2.3 - 5*

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

0.318679

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-10-31.221262

Unit

Source

[2]

Last Observation

Value

2025-11-01.288653

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

18 (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 2025UX18 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	1963-01-07 10:45	368.4	0.1951263	0.1818535	0.0044706
EARTH	1965-12-11 05:04	> 1 w	0.0950739	0.0932331	0.0031496
EARTH	1968-10-27 08:03	1331.1	0.0613826	0.0033404	0.0723662
EARTH	1982-01-07 12:56	> 1 d	0.1188290	0.1003079	0.0850024
EARTH	1984-11-09 03:21	> 1 mo	0.0531207	0.0108555	0.1224577
EARTH	1987-10-29 01:29	> 1 d	0.1675830	0.0070921	0.1577360
EARTH	2001-01-02 06:51	> 1 d	0.0998105	0.0966965	0.0017068
EARTH	2003-11-02 16:46	> 1 d	0.0230159	0.0014434	0.0221028
EARTH	2006-10-28 20:34	670.5	0.1724782	0.0990609	0.0244863
EARTH	2020-01-07 17:54	106.8	0.1795081	0.1604829	0.0065289
EARTH	2022-12-18 01:27	> 1 d	0.0964190	0.0959598	0.0002024
EARTH	2025-10-30 04:23	1.9	0.0003147	0.0003132	0.0000005
EARTH	2027-02-28 04:15	23.6	0.1678826	0.1673289	0.0001847
EARTH	2034-12-06 07:54	> 1 d	0.1508857	0.1470444	0.0012871
EARTH	2044-03-18 01:07	> 1 d	0.1224774	0.1143361	0.0029446
EARTH	2051-10-30 15:15	66.5	0.0279492	0.0082218	0.0065771
EARTH	2053-03-03 00:26	165.2	0.1304093	0.1278735	0.0008599
EARTH	2060-10-31 10:30	> 1 d	0.0427866	0.0002020	0.0264264
EARTH	2069-12-09 03:37	> 1 d	0.1557336	0.1498006	0.0019956
EARTH	2079-02-01 18:05	> 1 w	0.1617352	0.1330879	0.0103785
EARTH	2079-04-03 17:42	> 1 w	0.1551239	0.1211882	0.0164150
EARTH	2086-11-01 06:17	> 1 d	0.1186249	0.0003528	0.0585485
EARTH	2088-03-07 06:04	> 1 d	0.0945792	0.0939720	0.0065315
EARTH	2095-10-31 06:54	> 1 d	0.0248019	0.0013565	0.0728144
EARTH	2105-01-03 22:53	> 1 mo	0.1727091	0.1723864	0.0042216
EARTH	2105-04-23 04:56	> 1 mo	0.1965784	0.1559525	0.1642166
EARTH	2112-11-01 08:43	> 1 w	0.1049695	0.0005366	0.5954048
EARTH	2114-03-06 10:09	> 1 mo	0.1011111	0.0945333	0.2122890
EARTH	2121-11-18 02:30	> 1 mo	0.1170810	0.0292917	0.4131880

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
109.94905382	296.20683922	0.00003961	MINIMUM
261.38984509	64.42550253	0.09601291	MINIMUM
190.09569426	3.01026156	0.17280037	SADDLE
5.48117788	181.52647736	0.28822947	SADDLE
1.37654140	356.36766801	1.72654783	SADDLE
179.58418714	174.50737487	2.13027960	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025UX18

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2112-10-29.798	92753.798	-4.048	0.000	1.77 ± 0.007	1.16E6	1.18E-10	8.69E-4	-12.79	0


Based on 18 optical observations (of which 0 are rejected as outliers) from 2025/10/31.221 to 2025/11/01.289.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.85 and 1.85 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251103 051546.446 UTC.

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Download Impactor Table as: