Asteroids

2025UU9 help

Last update: 2025-11-03 13:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.779

Aphelion (Q)

1.044

Eccentricity (e)

0.145

Inclination (i)

6.6

deg

Orbit period (P)

318.0

Earth MOID

0.03728

U parameter

6.8

Next Earth close approach

Date

2032-11-21

Nominal distance (from Earth center)

0.1768

26449031

Maximum Brightness

26.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

10 - 23*

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

0.911783

1-sigma variation

0.000074

Unit

Eccentricity (e)

Value

0.145159

1-sigma variation

0.000150

Unit

Inclination (i)

Value

6.6002

1-sigma variation

0.0083

Unit

Long. of Ascending Node (Ω)

Value

213.1911

1-sigma variation

0.0009

Unit

Arg. of Perihelion (ω)

Value

341.4255

1-sigma variation

0.0064

Unit

Mean Anomaly (M)

Value

233.87814

1-sigma variation

0.00333

Unit

Perihelion distance

Value

0.779429

1-sigma variation

Unit

Aphelion distance

Value

1.044136

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.222429

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.040823

1-sigma variation

Unit

MOID

Value

0.037283

1-sigma variation

Unit

Orbit Period

Value

318.0061

1-sigma variation

Unit

U parameter

Value

6.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.54979E-9	-1.11832E-8	-6.18708E-7	-6.67358E-8	-4.56427E-7	-1.66898E-7
e	-1.11832E-8	2.25424E-8	1.24669E-6	1.34393E-7	9.15073E-7	3.42850E-7
i	-6.18708E-7	1.24669E-6	6.90010E-5	7.44594E-6	5.09888E-5	1.84613E-5
Ω	-6.67358E-8	1.34393E-7	7.44594E-6	8.04966E-7	5.55310E-6	1.91584E-6
ω	-4.56427E-7	9.15073E-7	5.09888E-5	5.55310E-6	4.06301E-5	9.39619E-6
M	-1.66898E-7	3.42850E-7	1.84613E-5	1.91584E-6	9.39619E-6	1.10835E-5

Date of computation: 2025-11-03 13:00 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

27.032

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

10 - 23*

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

0.781956

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

2025-11-02.36208

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

32 (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	1951-10-14 02:28	> 1 mo	0.0580719	0.0504671	0.0316296
EARTH	1958-11-21 13:18	> 1 d	0.1144580	0.0497995	0.0882161
EARTH	1971-09-11 05:39	> 1 d	0.1088933	0.0852187	0.0284377
EARTH	1978-06-24 15:53	> 1 w	0.1806564	0.1704586	0.0051876
EARTH	1978-11-07 02:30	> 1 d	0.0369935	0.0368369	0.0015336
EARTH	1991-09-04 07:41	247.9	0.1787864	0.1298643	0.0176967
EARTH	1998-10-17 00:58	> 1 d	0.0537866	0.0474513	0.0054362
EARTH	2005-11-20 23:57	505.4	0.1074012	0.0798013	0.0096916
EARTH	2018-09-08 13:12	545.0	0.1176007	0.1082813	0.0032688
EARTH	2025-06-30 15:59	63.0	0.1755693	0.1749889	0.0001935
EARTH	2025-11-01 23:51	< 1 min	0.0380334	0.0379036	0.0000433
EARTH	2032-11-21 09:46	38.9	0.1768009	0.1623300	0.0048449
EARTH	2045-09-17 05:32	> 1 d	0.0896257	0.0791511	0.0047934
EARTH	2046-02-14 01:11	> 1 w	0.1986084	0.1920157	0.0024248
EARTH	2052-06-24 21:42	> 1 w	0.1796444	0.1702057	0.0037585
EARTH	2052-11-04 10:50	> 1 d	0.0384504	0.0384471	0.0000720
EARTH	2059-11-22 06:57	255.3	0.1470005	0.0698952	0.0285861
EARTH	2072-09-03 13:59	> 1 d	0.1478179	0.0920361	0.0354844
EARTH	2079-09-29 04:21	> 1 w	0.0732270	0.0655033	0.0154136
EARTH	2080-02-02 08:41	> 1 mo	0.1872663	0.1544974	0.0148426
EARTH	2086-07-02 03:21	> 1 mo	0.1734882	0.1548079	0.0154147
EARTH	2086-10-29 22:31	> 1 w	0.0421546	0.0409511	0.0081553
EARTH	2093-06-04 03:59	> 1 mo	0.1964005	0.1869751	0.0148103
EARTH	2093-11-17 07:07	> 1 w	0.0654924	0.0455736	0.0492125
EARTH	2100-11-22 06:04	528.9	0.1974245	0.0574697	0.0636550
EARTH	2113-09-08 18:25	> 1 d	0.1126269	0.0876750	0.0130492
EARTH	2120-10-18 16:32	> 1 d	0.0517154	0.0441866	0.0053963

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
211.98177737	301.88330766	0.03728314	MINIMUM
2.63335793	95.18785458	0.22455195	SADDLE
7.97153002	281.35344358	1.77775249	SADDLE
186.91434257	100.30809286	2.04668135	MAXIMUM

Download:

MOID Plots

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