Asteroids

2011EO40 help

Last update: 2026-08-26 14:46 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.760

Aphelion (Q)

2.548

Eccentricity (e)

0.540

Inclination (i)

3.4

deg

Orbit period (P)

777.0

Earth MOID

0.04802

U parameter

1.0

Next Earth close approach

Date

2028-02-09

Nominal distance (from Earth center)

0.07318

10948225

Maximum Brightness

19.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

110 - 240*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-03-10

Observatory

University of Arizona 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.653996

1-sigma variation

3.016E-8

Unit

Eccentricity (e)

Value

0.540378

1-sigma variation

3.508E-7

Unit

Inclination (i)

Value

3.3615

1-sigma variation

1.752E-5

Unit

Long. of Ascending Node (Ω)

Value

50.1692

1-sigma variation

0.0006

Unit

Arg. of Perihelion (ω)

Value

17.2265

1-sigma variation

0.0007

Unit

Mean Anomaly (M)

Value

98.31137

1-sigma variation

0.00010

Unit

Perihelion distance

Value

0.760212

1-sigma variation

Unit

Aphelion distance

Value

2.547779

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.217806

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.409541

1-sigma variation

Unit

MOID

Value

0.048019

1-sigma variation

Unit

Orbit Period

Value

776.9624

1-sigma variation

Unit

U parameter

Value

1.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.09541E-16	-1.02857E-14	3.73553E-13	-1.02754E-11	1.18677E-11	-2.32678E-12
e	-1.02857E-14	1.23040E-13	-4.92419E-12	1.34192E-10	-1.57245E-10	3.05448E-11
i	3.73553E-13	-4.92419E-12	3.06972E-10	-9.89920E-9	1.13529E-8	-1.59706E-9
Ω	-1.02754E-11	1.34192E-10	-9.89920E-9	4.20097E-7	-4.66484E-7	4.84545E-8
ω	1.18677E-11	-1.57245E-10	1.13529E-8	-4.66484E-7	5.21175E-7	-5.69546E-8
M	-2.32678E-12	3.05448E-11	-1.59706E-9	4.84545E-8	-5.69546E-8	9.53149E-9

Date of computation: 2026-08-26 14:46 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

21.953

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

110 - 240*

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

5511

Unit

Source

[1]

Unobserved

Value

154

Unit

Source

[1]

Normalized RMS of residuals

Value

0.620832

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-03-10.21653

Unit

Source

[2]

Last Observation

Value

2026-04-11.30727

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

34 (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

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 2011EO40 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
MARS	1955-11-27 19:43	< 1 min	0.0331208	0.0331171	0.0000012
EARTH	1959-09-10 13:58	< 1 min	0.1217943	0.1217896	0.0000016
EARTH	1962-01-24 10:31	< 1 min	0.1132776	0.1132705	0.0000023
EARTH	1976-10-14 21:53	< 1 min	0.1636577	0.1636524	0.0000018
EARTH	1979-02-17 23:23	< 1 min	0.1965290	0.1965259	0.0000010
MARS	1987-11-16 15:19	< 1 min	0.0396687	0.0396645	0.0000014
EARTH	2008-09-13 19:27	< 1 min	0.0791490	0.0791434	0.0000019
EARTH	2011-01-28 18:58	< 1 min	0.0953500	0.0953488	0.0000004
EARTH	2025-09-25 07:12	< 1 min	0.0772443	0.0772424	0.0000006
EARTH	2028-02-09 20:43	< 1 min	0.0731844	0.0731773	0.0000024
EARTH	2042-10-31 00:51	2.0	0.1991015	0.1990986	0.0000010
EARTH	2074-09-18 03:02	< 1 min	0.0517458	0.0517402	0.0000019
EARTH	2077-02-02 20:45	< 1 min	0.0677096	0.0677027	0.0000023
EARTH	2091-10-02 09:19	2.9	0.1091357	0.1091014	0.0000114
EARTH	2094-02-13 05:10	1.2	0.1084523	0.1084192	0.0000111
MARS	2100-09-24 02:55	< 1 min	0.0406929	0.0406733	0.0000065
EARTH	2123-09-09 00:46	< 1 min	0.1903714	0.1903473	0.0000080
EARTH	2126-01-10 10:21	4.5	0.1720858	0.1720649	0.0000070

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
317.02041170	252.38716451	0.04801929	MINIMUM
41.42156125	31.85389566	0.05772523	MINIMUM
359.16682020	322.20380240	0.22713297	SADDLE
179.69814778	142.57132144	1.53463400	SADDLE
358.81467869	141.59103794	1.77346570	SADDLE
179.62607786	322.53787013	3.53452961	MAXIMUM

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MOID Plots

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