Asteroids

2011DU9 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.939

Aphelion (Q)

2.933

Eccentricity (e)

0.515

Inclination (i)

3.4

deg

Orbit period (P)

983.9

Earth MOID

0.00045

U parameter

7.8

Next Earth close approach

Date

2037-12-06

Nominal distance (from Earth center)

0.16653

24912282

Maximum Brightness

25.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

26.8

mag

Diameter

12 - 26*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-02-27

Observatory

OAM Observatory, La Sagra

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

1.935928

1-sigma variation

0.001307

Unit

Eccentricity (e)

Value

0.514791

1-sigma variation

0.000339

Unit

Inclination (i)

Value

3.4205

1-sigma variation

0.0020

Unit

Long. of Ascending Node (Ω)

Value

155.0622

1-sigma variation

0.0006

Unit

Arg. of Perihelion (ω)

Value

328.4251

1-sigma variation

0.0019

Unit

Mean Anomaly (M)

Value

178.46079

1-sigma variation

2.09059

Unit

Perihelion distance

Value

0.939330

1-sigma variation

Unit

Aphelion distance

Value

2.932526

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.001378

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.523871

1-sigma variation

Unit

MOID

Value

0.000446

1-sigma variation

Unit

Orbit Period

Value

983.8576

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.70905E-6	4.43145E-7	2.61930E-6	-7.91798E-7	2.50843E-6	-2.73304E-3
e	4.43145E-7	1.14905E-7	6.79171E-7	-2.05176E-7	6.50201E-7	-7.08659E-4
i	2.61930E-6	6.79171E-7	4.01467E-6	-1.21201E-6	3.84212E-6	-4.18868E-3
Ω	-7.91798E-7	-2.05176E-7	-1.21201E-6	4.07547E-7	-1.22727E-6	1.26621E-3
ω	2.50843E-6	6.50201E-7	3.84212E-6	-1.22727E-6	3.78956E-6	-4.01138E-3
M	-2.73304E-3	-7.08659E-4	-4.18868E-3	1.26621E-3	-4.01138E-3	4.37056E0

Date of computation: 2025-09-10 00:30 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

26.763

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

12 - 26*

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

5309

Unit

Source

[1]

Normalized RMS of residuals

Value

0.658225

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-02-27.01686

Unit

Source

[2]

Last Observation

Value

2011-03-11.391399

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

64 (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 2011DU9 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	1954-03-15 00:40	> 1 d	0.1635464	0.0048217	0.0903315
EARTH	1967-01-22 05:33	> 1 mo	0.0575923	0.0521037	0.0209601
EARTH	1979-12-01 01:48	> 1 w	0.1918507	0.0546268	0.1844652
EARTH	2011-02-23 19:02	< 1 min	0.0019218	0.0019183	0.0000012
EARTH	2037-12-06 02:11	> 1 w	0.1665283	0.0558248	0.1599217
EARTH	2046-03-10 08:06	> 1 w	0.0925874	0.0042473	0.1816199
EARTH	2072-12-30 15:24	> 1 mo	0.0496763	0.0496365	0.0050355
EARTH	2108-02-13 19:33	> 1 mo	0.0337547	0.0065618	0.6381967

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
18.30649974	52.28278680	0.00025909	MINIMUM
345.35460904	355.78109312	0.05036266	MINIMUM
356.63035014	15.08971980	0.05540182	SADDLE
180.11729168	201.47489809	1.91803035	SADDLE
0.55019864	201.88397806	1.95438203	SADDLE
180.22989453	21.53533095	3.91683887	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2011DU9

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2046-02-23.864	68399.864	-0.547	0.44 ± 0.003	1.57E3	6.82E-4	1.25E-1	-3.70
2054-02-23.827	71321.827	-0.608	1.36 ± 0.003	1.28E5	4.58E-6	1.25E-1	-6.00
2101-02-24.094	88488.094	-0.552	1.53 ± 0.000	2.08E8	2.42E-9	1.23E-1	-9.70


Based on 64 optical observations (of which 0 are rejected as outliers) from 2011/02/27.017 to 2011/03/11.391.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.62 and 1.62 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: