Asteroids

529366 2009WM1 help

Last update: 2026-09-03 14:54 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.981

Aphelion (Q)

1.380

Eccentricity (e)

0.169

Inclination (i)

25.8

deg

Orbit period (P)

468.5

Earth MOID

0.00047

U parameter

0.1

Next Earth close approach

Date

2050-11-28

Nominal distance (from Earth center)

0.11332

16953147

Maximum Brightness

18.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.4

mag

Diameter

220 - 500*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2009-11-17

Observatory

University of Arizona Catalina Sky 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.180458

1-sigma variation

5.072E-9

Unit

Eccentricity (e)

Value

0.168879

1-sigma variation

5.357E-8

Unit

Inclination (i)

Value

25.7662

1-sigma variation

1.686E-5

Unit

Long. of Ascending Node (Ω)

Value

240.2481

1-sigma variation

1.013E-5

Unit

Arg. of Perihelion (ω)

Value

162.6470

1-sigma variation

3.426E-5

Unit

Mean Anomaly (M)

Value

342.74155

1-sigma variation

0.00005

Unit

Perihelion distance

Value

0.981104

1-sigma variation

Unit

Aphelion distance

Value

1.379812

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.355154

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.000473

1-sigma variation

Unit

MOID

Value

0.000475

1-sigma variation

Unit

Orbit Period

Value

468.4617

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.57279E-17	-1.58511E-16	1.33526E-14	-1.87548E-15	1.10430E-13	-1.86187E-13
e	-1.58511E-16	2.86939E-15	-4.12315E-14	7.33915E-15	-5.54727E-13	1.03534E-12
i	1.33526E-14	-4.12315E-14	2.84202E-10	1.20756E-10	-1.60773E-10	4.69280E-11
Ω	-1.87548E-15	7.33915E-15	1.20756E-10	1.02530E-10	-1.79541E-10	1.18764E-10
ω	1.10430E-13	-5.54727E-13	-1.60773E-10	-1.79541E-10	1.17357E-9	-1.44898E-9
M	-1.86187E-13	1.03534E-12	4.69280E-11	1.18764E-10	-1.44898E-9	2.03098E-9

Date of computation: 2026-09-03 14:54 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

20.379

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

220 - 500*

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

5158

Unit

Source

[1]

Unobserved

Value

1013

Unit

Source

[1]

Normalized RMS of residuals

Value

0.694481

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-11-17.4641

Unit

Source

[2]

Last Observation

Value

2024-01-01.08802

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

162 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

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Plot

Computation parameters

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Initial Date: *

Final Date: *

Output option:

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Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 529366 2009WM1 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	1950-11-27 00:28	< 1 min	0.0905091	0.0904832	0.0000086
EARTH	1959-11-17 22:27	< 1 min	0.1033847	0.1033592	0.0000085
EARTH	1991-11-23 22:07	< 1 min	0.0175462	0.0175453	0.0000003
EARTH	2000-11-20 01:05	< 1 min	0.0475653	0.0475636	0.0000006
EARTH	2009-11-14 10:44	< 1 min	0.1660316	0.1660306	0.0000003
EARTH	2050-11-28 10:09	< 1 min	0.1133248	0.1133206	0.0000014
EARTH	2059-11-23 12:10	< 1 min	0.0046725	0.0046684	0.0000013
EARTH	2081-12-01 18:20	22.2	0.1858664	0.1847481	0.0003728
EARTH	2094-11-19 17:19	37.2	0.0686804	0.0670961	0.0005281
EARTH	2116-11-25 17:07	3.4	0.0413611	0.0412107	0.0000501

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
14.67870257	316.51934780	0.00047496	MINIMUM
212.31180012	144.54437409	0.34685082	MINIMUM
287.69852043	216.24819188	0.48058726	SADDLE
114.72908270	62.66672366	0.55081773	SADDLE
336.79573360	95.11863742	1.97450942	SADDLE
183.37767812	302.14735552	2.36716758	MAXIMUM

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MOID Plots

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