Asteroids

2011DU9

Last update: 2023-10-02 13:05 UTC

Orbital Properties

Epoch

60200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.939

Aphelion (Q)

2.931

Eccentricity (e)

0.515

Inclination (i)

3.4

deg

Orbit period (P)

983.4

Earth MOID

0.00070

U parameter

7.8

Next Earth close approach

Date

2037-12-06

Nominal distance (from Earth center)

0.16669

24936266

Maximum Brightness

25.3

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.7

mag

Diameter

16*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-02-27

Observatory

OAM Observatory, La Sagra

Orbit Visualiser

Click the button to start Orbit Visualiser

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion
Aphelion
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

60200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.935306

1-sigma variation

0.001319

Unit

Eccentricity (e)

Value

0.514737

1-sigma variation

0.000346

Unit

Inclination (i)

Value

3.4204

1-sigma variation

0.0020

Unit

Ascending Node (Ω)

Value

155.0830

1-sigma variation

0.0014

Unit

Arg. of Perihelion (ω)

Value

328.4099

1-sigma variation

0.0041

Unit

Mean Anomaly (M)

Value

245.70656

1-sigma variation

1.79566

Unit

Perihelion

Value

0.939132

1-sigma variation

Unit

Aphelion

Value

2.931479

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.002184

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.523346

1-sigma variation

Unit

MOID

Value

0.000703

1-sigma variation

Unit

Orbit Period

Value

983.3831

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.73896E-6	4.56848E-7	2.69982E-6	-1.84630E-6	5.33033E-6	-2.36793E-3
e	4.56848E-7	1.20021E-7	7.09283E-7	-4.84917E-7	1.40013E-6	-6.22087E-4
i	2.69982E-6	7.09283E-7	4.19191E-6	-2.86497E-6	8.27328E-6	-3.67632E-3
Ω	-1.84630E-6	-4.84917E-7	-2.86497E-6	2.00099E-6	-5.72451E-6	2.51409E-3
ω	5.33033E-6	1.40013E-6	8.27328E-6	-5.72451E-6	1.64467E-5	-7.25828E-3
M	-2.36793E-3	-6.22087E-4	-3.67632E-3	2.51409E-3	-7.25828E-3	3.22439E0

Date of computation: 2023-08-01 23:50 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

26.677

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

Unit

Source

[-]

Diameter

Value

16*

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 ODIM	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

4588

Unit

Source

[1]

Astrometry Summary

RMS of Residuals
First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

RMS of Residuals

Value

0.658121

Unit

arcsec

Source

[1]

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2123

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1954-03-15 00:50	> 1 d	0.1636372	0.0048255	0.0896964
EARTH	1967-01-22 07:07	> 1 mo	0.0575711	0.0519350	0.0212137
EARTH	1979-12-01 02:09	> 1 w	0.1916647	0.0546229	0.1844343
EARTH	2011-02-23 19:02	< 1 min	0.0019218	0.0019183	0.0000012
EARTH	2037-12-06 01:51	> 1 w	0.1666886	0.0558293	0.1599489
EARTH	2046-03-10 07:39	> 1 w	0.0924054	0.0042375	0.1815862
EARTH	2072-12-30 16:27	> 1 mo	0.0496713	0.0496353	0.0048136
EARTH	2108-02-14 03:54	> 1 mo	0.0331079	0.0062301	0.6517519

Download as:

2011DU9

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2046-02-23.864	68399.864	-0.547	0.44 ± 0.003	1.57E3	6.82E-4	8.52E-5	-3.75
2054-02-23.827	71321.827	-0.608	1.36 ± 0.003	1.28E5	4.58E-6	5.73E-7	-6.04
2101-02-24.094	88488.094	-0.552	1.53 ± 0.000	2.08E8	2.42E-9	2.98E-10	-9.72


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.
Aegis software version= 4.0, Date of computation=20220711 093027.606 UTC.

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Download Impactor Table as: