Asteroids

2025UK9 help

Last update: 2025-10-30 01:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.737

Aphelion (Q)

1.263

Eccentricity (e)

0.263

Inclination (i)

2.3

deg

Orbit period (P)

365.3

Earth MOID

0.00050

U parameter

6.3

Next Earth close approach

Date

2026-10-31

Nominal distance (from Earth center)

0.00248

371120

Maximum Brightness

19.7

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

29.9

mag

Diameter

2.7 - 6*

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.000155

1-sigma variation

0.000046

Unit

Eccentricity (e)

Value

0.262968

1-sigma variation

0.000095

Unit

Inclination (i)

Value

2.2571

1-sigma variation

0.0008

Unit

Long. of Ascending Node (Ω)

Value

38.1809

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

102.9404

1-sigma variation

0.0036

Unit

Mean Anomaly (M)

Value

307.55444

1-sigma variation

0.01331

Unit

Perihelion distance

Value

0.737146

1-sigma variation

Unit

Aphelion distance

Value

1.263164

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.003288

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.129419

1-sigma variation

Unit

MOID

Value

0.000499

1-sigma variation

Unit

Orbit Period

Value

365.3419

1-sigma variation

Unit

U parameter

Value

6.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.14193E-9	4.37922E-9	3.71786E-8	6.08345E-9	-1.64032E-7	6.15501E-7
e	4.37922E-9	9.03099E-9	7.68643E-8	1.20083E-8	-3.29987E-7	1.26253E-6
i	3.71786E-8	7.68643E-8	6.55077E-7	1.00435E-7	-2.78769E-6	1.07289E-5
Ω	6.08345E-9	1.20083E-8	1.00435E-7	2.02574E-8	-4.96210E-7	1.72528E-6
ω	-1.64032E-7	-3.29987E-7	-2.78769E-6	-4.96210E-7	1.29353E-5	-4.68501E-5
M	6.15501E-7	1.26253E-6	1.07289E-5	1.72528E-6	-4.68501E-5	1.77088E-4

Date of computation: 2025-10-30 01:00 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

29.949

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

2.7 - 6*

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

0.48451

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-10-28.308163

Unit

Source

[2]

Last Observation

Value

2025-10-30.001255

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

21 (1)

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 2025UK9 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	1951-05-24 16:51	> 1 w	0.1243926	0.0120135	0.1205846
EARTH	1952-05-22 08:11	> 1 d	0.0160717	0.0149498	0.0233026
EARTH	1953-05-28 18:24	> 1 d	0.1490923	0.0149958	0.0745279
EARTH	1985-10-29 15:03	> 1 d	0.0409190	0.0012876	0.0566466
EARTH	1986-10-29 01:58	> 1 w	0.1174620	0.0035904	0.0488209
EARTH	1991-04-17 14:29	> 1 w	0.1617139	0.1301552	0.0105956
EARTH	1991-06-09 09:28	> 1 d	0.1614650	0.1250127	0.0121546
EARTH	1992-05-21 21:07	420.5	0.0165381	0.0150557	0.0030321
EARTH	1993-05-28 16:09	417.1	0.1456289	0.1233224	0.0074434
EARTH	2024-10-23 19:50	17.8	0.1668713	0.1659005	0.0003236
EARTH	2025-10-30 21:33	< 1 min	0.0028030	0.0027995	0.0000011
EARTH	2026-10-31 02:20	16.0	0.0024808	0.0012238	0.0004271
EARTH	2027-10-25 05:11	1097.4	0.1755617	0.1032712	0.0240972
VENUS	2038-09-26 20:58	> 1 mo	0.0346850	0.0160191	0.2298753
VENUS	2050-06-07 20:28	> 1 mo	0.0457363	0.0176754	0.4762821
EARTH	2057-06-09 18:15	> 1 d	0.0700061	0.0245635	0.0247732
EARTH	2058-06-07 05:43	> 1 d	0.0806843	0.0231847	0.0415061
EARTH	2059-07-12 01:36	> 1 mo	0.1882294	0.0400384	0.0498166
EARTH	2062-09-23 02:21	> 1 mo	0.1976659	0.0270817	0.1520080
EARTH	2063-10-27 12:42	> 1 mo	0.1036550	0.0027286	0.3991145
EARTH	2064-10-30 09:26	> 1 w	0.0389024	0.0001517	0.4776720
EARTH	2065-10-24 16:06	> 1 w	0.1938553	0.0002130	0.3727535
VENUS	2066-12-10 18:37	> 1 mo	0.0460465	0.0033518	0.2957495
EARTH	2094-06-11 16:58	> 1 mo	0.0937731	0.0267860	2.3015396
EARTH	2095-06-08 06:46	> 1 mo	0.0752650	0.0262286	2.0601299
EARTH	2096-07-15 10:37	> 1 mo	0.1934268	0.0230732	0.8421224
EARTH	2099-10-05 06:45	> 1 w	0.1689322	0.0387318	0.1125430
EARTH	2099-12-14 15:02	> 1 mo	0.1885755	0.0612677	0.0816456
EARTH	2100-11-02 01:01	> 1 w	0.0360998	0.0003594	0.7914580
EARTH	2101-10-29 03:34	> 1 mo	0.1114165	0.0006268	1.2049616
VENUS	2125-06-07 05:43	> 1 mo	0.0107355	0.0081966	0.7735964

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
271.57511003	296.98226984	0.00049937	MINIMUM
92.69578804	147.09136819	0.02068555	MINIMUM
2.97193142	42.81073085	0.25273995	SADDLE
181.60994386	221.58062846	0.25299156	SADDLE
3.37810742	223.31079787	1.75058479	SADDLE
181.93279206	41.81637466	2.25044711	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025UK9

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2040-10-30.796	66457.796	4.751	1.23 ± 0.004	2.03E4	6.50E-10	1.43E-3	-11.14
2040-10-30.828	66457.828	4.398	0.68 ± 0.004	1.44E4	5.76E-9	1.43E-3	-10.20
2041-10-30.845	66822.845	4.014	0.42 ± 0.006	4.31E4	1.02E-8	1.42E-3	-9.98
2041-10-30.918	66822.918	4.965	0.13 ± 0.038	2.66E5	2.36E-11	1.43E-3	-12.61
2052-10-30.780	70840.780	4.407	0.87 ± 0.005	1.91E6	3.92E-11	1.42E-3	-12.61
2053-10-31.041	71206.041	4.735	1.49 ± 0.006	5.21E5	2.07E-11	1.43E-3	-12.90
2055-10-30.851	71935.851	4.915	1.58 ± 0.103	9.37E4	3.85E-11	1.42E-3	-12.66
2056-10-30.341	72301.341	0.620	0.73 ± 0.016	1.53E5	7.55E-6	1.42E-3	-7.38
2057-10-30.492	72666.492	0.620	0.27 ± 0.000	2.47E7	4.72E-8	1.42E-3	-9.60
2057-10-30.634	72666.634	3.802	0.91 ± 0.005	1.96E5	4.52E-9	1.42E-3	-10.62
2059-10-31.557	73397.557	3.644	0.20 ± 0.020	2.56E4	7.22E-8	1.43E-3	-9.44
2062-10-30.687	74492.687	3.569	1.45 ± 0.163	3.19E5	4.58E-9	1.44E-3	-10.67
2064-10-30.178	75223.178	3.097	1.51 ± 0.021	7.19E6	1.07E-9	1.41E-3	-11.33
2065-10-31.088	75589.088	3.088	1.13 ± 0.003	6.10E4	1.95E-7	1.42E-3	-9.08
2070-10-30.981	77414.981	1.986	1.66 ± 0.003	2.12E5	3.54E-7	1.42E-3	-8.87
2071-10-31.287	77780.287	-2.575	1.21 ± 0.008	7.62E4	5.18E-7	1.42E-3	-8.71
2074-10-31.673	78876.673	1.506	1.06 ± 0.310	9.29E7	4.57E-9	1.43E-3	-10.79
2075-10-31.413	79241.413	3.087	0.81 ± 0.000	1.29E8	9.13E-11	1.43E-3	-12.50
2076-10-30.655	79606.655	-0.750	1.50 ± 0.001	1.37E7	4.29E-8	1.42E-3	-9.84
2076-10-30.737	79606.737	1.248	1.74 ± 0.034	5.71E6	2.74E-8	1.41E-3	-10.04
2077-10-30.538	79971.538	1.241	0.04 ± 0.077	8.49E6	7.73E-8	1.42E-3	-9.59
2077-10-30.965	79971.965	-0.781	0.94 ± 0.003	3.18E6	2.81E-7	1.42E-3	-9.03
2078-10-31.267	80337.267	-0.749	1.65 ± 0.005	9.68E6	9.53E-8	1.42E-3	-9.51
2079-10-31.411	80702.411	3.371	0.35 ± 0.060	8.70E4	5.52E-8	1.42E-3	-9.75
2079-10-31.926	80702.926	1.510	1.76 ± 0.000	1.30E8	1.71E-9	1.43E-3	-11.26
2083-10-30.937	82162.937	1.226	0.58 ± 0.000	6.12E7	1.05E-8	1.42E-3	-10.51
2084-10-30.559	82528.559	-0.759	1.67 ± 0.000	9.50E7	6.11E-9	1.42E-3	-10.75
2084-10-30.611	82528.611	-0.818	1.07 ± 0.023	4.24E6	1.95E-7	1.41E-3	-9.25
2084-10-31.189	82529.189	1.552	1.17 ± 0.025	2.79E6	1.16E-7	1.42E-3	-9.47
2085-10-30.857	82893.857	-0.765	0.83 ± 0.000	1.07E7	8.81E-8	1.42E-3	-9.60
2087-10-31.277	83624.277	0.346	0.96 ± 0.027	6.36E5	1.78E-6	1.42E-3	-8.30
2088-10-30.343	83989.343	-0.777	1.78 ± 0.009	8.46E6	1.32E-8	1.42E-3	-10.44
2088-10-30.456	83989.456	0.346	1.20 ± 0.000	1.45E8	8.62E-9	1.42E-3	-10.63
2089-10-30.110	84354.110	-0.768	0.63 ± 0.000	1.81E8	5.82E-9	1.42E-3	-10.80
2089-10-30.808	84354.808	-2.808	0.54 ± 2.437	9.18E6	1.29E-9	1.41E-3	-11.46
2093-10-30.807	85815.807	-0.915	1.59 ± 0.019	3.07E5	2.69E-6	1.41E-3	-8.17
2094-10-30.901	86180.901	-0.915	0.99 ± 0.000	1.03E8	9.13E-9	1.41E-3	-10.64
2096-10-30.432	86911.432	0.362	1.63 ± 0.024	2.80E7	1.96E-8	1.42E-3	-10.32
2096-10-31.068	86912.068	-1.124	0.62 ± 0.012	4.99E4	1.43E-5	1.42E-3	-7.46
2096-10-31.069	86912.069	-1.182	0.49 ± 0.013	3.29E4	2.08E-5	1.42E-3	-7.30
2096-10-31.106	86912.106	-1.267	0.50 ± 0.015	1.19E5	5.20E-6	1.42E-3	-7.90
2097-10-31.070	87277.070	0.366	1.49 ± 0.011	4.01E5	3.31E-6	1.42E-3	-8.10
2097-10-31.211	87277.211	-1.123	1.02 ± 0.000	3.59E6	2.07E-7	1.42E-3	-9.30
2097-10-31.211	87277.211	-1.183	0.41 ± 0.002	2.35E6	2.96E-7	1.42E-3	-9.15
2097-10-31.248	87277.248	-1.266	0.51 ± 0.006	6.69E6	9.18E-8	1.42E-3	-9.66
2097-10-31.522	87277.522	0.485	0.68 ± 0.012	6.87E5	1.69E-6	1.43E-3	-8.39
2098-10-31.246	87642.246	0.366	0.25 ± 0.000	5.51E7	2.39E-8	1.42E-3	-10.25
2098-10-31.711	87642.711	0.485	1.21 ± 0.063	3.58E7	3.38E-8	1.43E-3	-10.09
2100-11-01.018	88373.018	4.345	1.03 ± 0.042	1.05E7	1.04E-11	1.43E-3	-13.62
2101-10-31.627	88737.627	0.958	0.93 ± 0.002	1.59E6	4.85E-7	1.42E-3	-8.96
2102-10-31.691	89102.691	1.028	1.49 ± 0.045	1.11E8	4.30E-9	1.42E-3	-11.01
2104-10-31.107	89833.107	0.614	1.58 ± 0.131	2.42E7	4.56E-8	1.40E-3	-10.00
2104-10-31.647	89833.647	0.354	0.73 ± 0.024	2.10E7	5.78E-8	1.43E-3	-9.90
2105-10-31.600	90198.600	-0.780	0.52 ± 0.000	1.74E8	5.98E-9	1.43E-3	-10.88
2106-10-31.677	90563.677	-0.736	1.33 ± 0.063	3.33E7	2.95E-8	1.42E-3	-10.20
2106-10-31.696	90563.696	0.608	0.91 ± 0.039	1.06E4	1.10E-4	1.41E-3	-6.63
2106-10-31.709	90563.709	0.608	1.56 ± 0.053	1.76E4	6.77E-5	1.41E-3	-6.84
2106-11-01.024	90564.024	0.977	1.31 ± 0.000	7.07E5	1.13E-6	1.42E-3	-8.62
2108-10-31.607	91294.607	3.828	1.73 ± 0.208	8.31E6	2.60E-11	1.44E-3	-13.26
2109-10-31.479	91659.479	0.690	1.25 ± 0.001	1.71E5	5.33E-6	1.41E-3	-7.96
2109-10-31.760	91659.760	1.023	0.27 ± 0.005	2.90E6	2.88E-7	1.42E-3	-9.23
2109-10-31.760	91659.760	1.023	0.27 ± 0.006	2.91E6	2.87E-7	1.42E-3	-9.23
2110-10-31.337	92024.337	1.189	0.62 ± 0.019	2.37E7	2.85E-8	1.41E-3	-10.24
2110-10-31.565	92024.565	0.690	1.01 ± 0.000	2.79E7	4.04E-8	1.41E-3	-10.09
2111-11-01.776	92390.776	-0.575	0.85 ± 0.036	3.83E6	2.83E-7	1.42E-3	-9.24
2114-11-01.405	93486.405	-0.830	1.79 ± 0.015	5.84E6	3.84E-8	1.41E-3	-10.13
2114-11-01.960	93486.960	0.826	1.30 ± 0.016	3.50E6	2.88E-7	1.43E-3	-9.25
2115-10-31.759	93850.759	-0.768	0.87 ± 0.000	6.34E7	1.47E-8	1.42E-3	-10.55
2115-11-01.905	93851.905	3.457	1.45 ± 0.036	5.50E5	3.78E-9	1.42E-3	-11.14
2116-10-31.636	94216.636	-0.792	1.26 ± 0.003	4.44E6	1.66E-7	1.42E-3	-9.50
2116-11-01.050	94217.050	3.457	0.68 ± 0.032	8.46E7	3.94E-11	1.43E-3	-13.12
2117-10-31.864	94581.864	-0.863	0.84 ± 0.032	9.84E6	9.92E-8	1.42E-3	-9.73
2118-11-01.750	94947.750	0.660	0.66 ± 0.000	2.06E7	5.48E-8	1.41E-3	-9.99
2119-10-31.928	95311.928	0.899	0.09 ± 1.293	5.18E6	1.27E-7	1.43E-3	-9.63
2119-11-01.729	95312.729	-2.196	1.35 ± 0.003	1.88E6	4.50E-8	1.42E-3	-10.08
2120-11-01.050	95678.050	2.129	1.33 ± 0.010	1.31E6	7.55E-8	1.42E-3	-9.86
2121-11-01.926	96043.926	-2.223	0.74 ± 0.019	1.37E5	8.12E-7	1.42E-3	-8.83
2122-11-01.169	96408.169	0.365	0.44 ± 0.009	1.85E7	7.01E-8	1.42E-3	-9.90
2122-11-01.912	96408.912	1.320	0.20 ± 0.537	4.84E6	1.15E-7	1.43E-3	-9.68
2122-11-01.954	96408.954	1.316	1.30 ± 0.010	5.54E6	1.02E-7	1.43E-3	-9.73


Based on 21 optical observations (of which 1 are rejected as outliers) from 2025/10/28.308 to 2025/10/30.001.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.78 and 1.78 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251030 011501.215 UTC.

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