Asteroids

2025WU9 help

Last update: 2025-12-31 13:01 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.653

Aphelion (Q)

1.052

Eccentricity (e)

0.234

Inclination (i)

4.7

deg

Orbit period (P)

287.6

Earth MOID

0.00040

U parameter

5.7

Next Earth close approach

Date

2029-12-03

Nominal distance (from Earth center)

0.05835

8728706

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.3

mag

Diameter

6 - 13*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-11-29

Observatory

JPL SynTrack Robotic Telescope, Auberry

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

0.852608

1-sigma variation

0.000012

Unit

Eccentricity (e)

Value

0.234265

1-sigma variation

0.000028

Unit

Inclination (i)

Value

4.7079

1-sigma variation

0.0007

Unit

Long. of Ascending Node (Ω)

Value

249.1004

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

321.0428

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

224.91050

1-sigma variation

0.00168

Unit

Perihelion distance

Value

0.652872

1-sigma variation

Unit

Aphelion distance

Value

1.052344

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.333719

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.000927

1-sigma variation

Unit

MOID

Value

0.000402

1-sigma variation

Unit

Orbit Period

Value

287.5559

1-sigma variation

Unit

U parameter

Value

5.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.47538E-10	-3.34830E-10	-8.16524E-9	7.60264E-10	-6.21337E-9	-2.01148E-8
e	-3.34830E-10	7.60698E-10	1.85631E-8	-1.73069E-9	1.39816E-8	4.58970E-8
i	-8.16524E-9	1.85631E-8	4.53675E-7	-4.24597E-8	3.39312E-7	1.12303E-6
Ω	7.60264E-10	-1.73069E-9	-4.24597E-8	4.02881E-9	-3.13121E-8	-1.05270E-7
ω	-6.21337E-9	1.39816E-8	3.39312E-7	-3.13121E-8	2.79176E-7	8.10950E-7
M	-2.01148E-8	4.58970E-8	1.12303E-6	-1.05270E-7	8.10950E-7	2.81737E-6

Date of computation: 2025-12-31 13:01 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

28.291

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

6 - 13*

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

0.618305

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-11-26.21492

Unit

Source

[2]

Last Observation

Value

2025-11-30.828573

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

65 (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 2025WU9 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1958-09-27 06:05	683.4	0.0780535	0.0777998	0.0001281
EARTH	1962-12-03 13:17	316.2	0.1417560	0.1167747	0.0083276
VENUS	1963-03-30 01:44	1341.2	0.0470715	0.0283486	0.0085694
EARTH	1969-09-18 14:10	315.0	0.1970118	0.1689497	0.0095135
EARTH	1973-11-15 18:01	> 1 d	0.0573137	0.0405221	0.0056686
EARTH	1984-09-17 05:51	1.5	0.1032110	0.0979392	0.0018338
EARTH	1988-12-03 01:50	55.2	0.0251343	0.0238412	0.0004311
EARTH	1999-11-21 23:35	> 1 d	0.0439914	0.0322839	0.0039151
VENUS	2008-02-22 00:40	381.2	0.0291441	0.0274078	0.0007985
EARTH	2010-10-04 19:20	699.4	0.0794541	0.0791560	0.0001168
EARTH	2014-12-03 05:20	39.4	0.1590100	0.1550215	0.0013295
EARTH	2021-09-17 21:51	7.8	0.1509374	0.1497440	0.0003983
EARTH	2025-11-30 14:49	< 1 s	0.0049169	0.0049151	0.0000006
EARTH	2029-12-03 17:07	7.7	0.0583478	0.0565946	0.0005844
EARTH	2033-12-02 06:16	26.7	0.1630461	0.1604446	0.0008672
VENUS	2035-10-29 21:40	146.7	0.0440973	0.0409544	0.0010609
EARTH	2060-09-14 16:55	19.2	0.1642559	0.1612302	0.0010117
EARTH	2064-09-14 13:45	47.5	0.0981709	0.0963815	0.0006087
EARTH	2068-09-24 23:01	344.1	0.0809449	0.0807593	0.0000719
EARTH	2072-10-17 21:34	475.9	0.0848126	0.0846299	0.0000628
EARTH	2076-11-05 20:15	190.5	0.0728055	0.0724022	0.0001346
VENUS	2078-11-07 12:35	18.8	0.0489456	0.0489033	0.0000141
EARTH	2080-11-21 17:57	72.7	0.0436124	0.0432023	0.0001367
EARTH	2084-11-28 22:53	112.4	0.0129594	0.0113550	0.0005352
EARTH	2088-11-13 07:16	> 1 d	0.0621363	0.0557247	0.0021499
EARTH	2092-10-19 17:20	> 1 d	0.0858763	0.0834566	0.0009259
EARTH	2096-09-21 02:16	> 1 d	0.0828207	0.0823621	0.0007610
EARTH	2100-09-12 17:24	312.5	0.1036081	0.0875450	0.0068116
EARTH	2104-09-13 09:33	315.2	0.1794514	0.1453255	0.0117759
VENUS	2105-04-26 08:56	> 1 d	0.0270002	0.0156094	0.0123061
VENUS	2123-10-16 09:06	> 1 d	0.0238638	0.0147897	0.0245879

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
228.10538476	328.10495711	0.00040160	MINIMUM
145.41213274	262.32091307	0.07735556	MINIMUM
168.31483097	280.64834563	0.08046414	SADDLE
3.76745565	112.29718484	0.35616474	SADDLE
5.26607425	294.23603233	1.64677349	SADDLE
183.99983465	112.95887529	2.05862093	MAXIMUM

Download:

MOID Plots

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