Asteroids

2025UU9 help

Last update: 2025-11-24 19:20 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.780

Aphelion (Q)

1.044

Eccentricity (e)

0.145

Inclination (i)

6.6

deg

Orbit period (P)

318.1

Earth MOID

0.03724

U parameter

6.6

Next Earth close approach

Date

2032-11-21

Nominal distance (from Earth center)

0.1713

25626684

Maximum Brightness

26.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

11 - 24*

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

0.911867

1-sigma variation

0.000060

Unit

Eccentricity (e)

Value

0.144989

1-sigma variation

0.000121

Unit

Inclination (i)

Value

6.5910

1-sigma variation

0.0067

Unit

Long. of Ascending Node (Ω)

Value

213.1901

1-sigma variation

0.0007

Unit

Arg. of Perihelion (ω)

Value

341.4193

1-sigma variation

0.0050

Unit

Mean Anomaly (M)

Value

233.87464

1-sigma variation

0.00183

Unit

Perihelion distance

Value

0.779657

1-sigma variation

Unit

Aphelion distance

Value

1.044078

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.222201

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.040771

1-sigma variation

Unit

MOID

Value

0.037236

1-sigma variation

Unit

Orbit Period

Value

318.0504

1-sigma variation

Unit

U parameter

Value

6.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.57452E-9	-7.21266E-9	-4.02678E-7	-4.39749E-8	-2.99681E-7	-9.95843E-8
e	-7.21266E-9	1.45553E-8	8.12569E-7	8.87121E-8	6.04083E-7	2.01848E-7
i	-4.02678E-7	8.12569E-7	4.53678E-5	4.95451E-6	3.37497E-5	1.12332E-5
Ω	-4.39749E-8	8.87121E-8	4.95451E-6	5.41759E-7	3.69631E-6	1.21069E-6
ω	-2.99681E-7	6.04083E-7	3.37497E-5	3.69631E-6	2.53814E-5	7.97113E-6
M	-9.95843E-8	2.01848E-7	1.12332E-5	1.21069E-6	7.97113E-6	3.33136E-6

Date of computation: 2025-11-24 19:20 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

26.996

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

11 - 24*

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

[-]

Download this part as:

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

0.795214

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-10-28.264477

Unit

Source

[2]

Last Observation

Value

2025-11-08.242706

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

35 (2)

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 2025UU9 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	1951-06-13 05:10	> 1 mo	0.1888484	0.1799414	0.0101602
EARTH	1951-11-14 15:21	> 1 w	0.0472700	0.0395797	0.0228434
EARTH	1971-09-24 16:54	> 1 w	0.0809728	0.0705277	0.0140980
EARTH	1972-02-07 04:05	> 1 mo	0.1920139	0.1665113	0.0108533
EARTH	1978-06-15 17:53	> 1 w	0.1874945	0.1781617	0.0056836
EARTH	1978-11-12 23:32	> 1 d	0.0444083	0.0388679	0.0108136
EARTH	1991-09-04 21:41	565.8	0.1574262	0.1149072	0.0159800
EARTH	1998-10-22 09:41	> 1 d	0.0477521	0.0430758	0.0040527
EARTH	2005-11-21 10:54	293.2	0.1185590	0.0953112	0.0079798
EARTH	2018-09-09 05:50	493.8	0.1139432	0.1066306	0.0025469
EARTH	2025-06-30 16:30	49.6	0.1753514	0.1748832	0.0001561
EARTH	2025-11-01 23:50	< 1 min	0.0379852	0.0378801	0.0000350
EARTH	2032-11-21 10:48	24.3	0.1713038	0.1597116	0.0038787
EARTH	2045-09-14 05:52	> 1 d	0.0952844	0.0850921	0.0041610
EARTH	2052-06-29 20:47	> 1 w	0.1753145	0.1670103	0.0031221
EARTH	2052-11-01 00:13	> 1 d	0.0392501	0.0387944	0.0010874
EARTH	2059-11-21 18:05	555.9	0.1189527	0.0728689	0.0167142
EARTH	2072-09-02 14:34	145.0	0.1794996	0.1328375	0.0168080
EARTH	2079-09-19 21:21	> 1 d	0.0850700	0.0750713	0.0055521
EARTH	2080-02-12 07:16	> 1 w	0.1962343	0.1875278	0.0032124
EARTH	2086-10-22 23:14	> 1 d	0.0477287	0.0452483	0.0015633
EARTH	2093-06-10 19:55	> 1 d	0.1903540	0.1886227	0.0005894
EARTH	2093-11-13 13:09	301.3	0.0498351	0.0480176	0.0006108
EARTH	2100-11-22 06:07	145.3	0.1778055	0.1624664	0.0051471
EARTH	2113-09-08 13:16	> 1 d	0.1145490	0.0947753	0.0078212
EARTH	2120-10-21 12:16	> 1 d	0.0482038	0.0433437	0.0042601

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
211.98524650	301.88397167	0.03723600	MINIMUM
2.64811884	95.19722713	0.22432084	SADDLE
7.98024759	281.35486772	1.77798168	SADDLE
186.92163114	100.30802132	2.04662218	MAXIMUM

Download:

MOID Plots

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