Asteroids

2011EO40 help

Last update: 2025-08-17 15:15 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.760

Aphelion (Q)

2.548

Eccentricity (e)

0.540

Inclination (i)

3.4

deg

Orbit period (P)

777.1

Earth MOID

0.04804

U parameter

2.6

Next Earth close approach

Date

2025-09-25

Nominal distance (from Earth center)

0.07725

11555701

Maximum Brightness

20.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.9

mag

Diameter

110 - 250*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-03-10

Observatory

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.654159

1-sigma variation

4.397E-7

Unit

Eccentricity (e)

Value

0.540428

1-sigma variation

0.000004

Unit

Inclination (i)

Value

3.3616

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

50.1710

1-sigma variation

0.0018

Unit

Arg. of Perihelion (ω)

Value

17.2312

1-sigma variation

0.0020

Unit

Mean Anomaly (M)

Value

5.63700

1-sigma variation

0.00062

Unit

Perihelion distance

Value

0.760206

1-sigma variation

Unit

Aphelion distance

Value

2.548113

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.217391

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.408206

1-sigma variation

Unit

MOID

Value

0.048041

1-sigma variation

Unit

Orbit Period

Value

777.0777

1-sigma variation

Unit

U parameter

Value

2.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.93343E-13	-1.96963E-12	3.99222E-11	-6.66225E-10	7.39700E-10	-2.68375E-10
e	-1.96963E-12	2.00783E-11	-4.08847E-10	6.87105E-9	-7.63381E-9	2.74543E-9
i	3.99222E-11	-4.08847E-10	8.72469E-9	-1.58312E-7	1.76333E-7	-5.76607E-8
Ω	-6.66225E-10	6.87105E-9	-1.58312E-7	3.29935E-6	-3.67453E-6	1.02021E-6
ω	7.39700E-10	-7.63381E-9	1.76333E-7	-3.67453E-6	4.09610E-6	-1.13676E-6
M	-2.68375E-10	2.74543E-9	-5.76607E-8	1.02021E-6	-1.13676E-6	3.84034E-7

Date of computation: 2025-08-17 15:15 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

21.883

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

110 - 250*

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

5274

Unit

Source

[1]

Unobserved

Value

0.9

Unit

Source

[1]

Normalized RMS of residuals

Value

0.590917

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

2025-08-17.471084

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

27 (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 2011EO40 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
MARS	1955-11-27 19:44	2.7	0.0331260	0.0330748	0.0000171
EARTH	1959-09-10 13:59	4.1	0.1217874	0.1217134	0.0000247
EARTH	1962-01-24 10:34	9.2	0.1132672	0.1131527	0.0000382
EARTH	1976-10-14 21:52	3.0	0.1636549	0.1636150	0.0000133
EARTH	1979-02-17 23:23	< 1 min	0.1965305	0.1965176	0.0000043
MARS	1987-11-16 15:19	1.1	0.0396703	0.0396487	0.0000072
EARTH	2008-09-13 19:27	1.7	0.0791563	0.0790736	0.0000276
EARTH	2011-01-28 18:57	2.3	0.0953508	0.0953418	0.0000030
EARTH	2025-09-25 07:13	3.2	0.0772451	0.0772345	0.0000035
EARTH	2028-02-09 20:43	2.6	0.0731903	0.0731154	0.0000250
EARTH	2042-10-31 00:55	24.7	0.1991049	0.1990649	0.0000133
EARTH	2074-09-18 03:01	3.0	0.0517498	0.0516990	0.0000170
EARTH	2077-02-02 20:44	5.1	0.0677124	0.0676680	0.0000148
EARTH	2091-10-02 09:12	26.9	0.1091116	0.1087937	0.0001060
EARTH	2094-02-13 05:07	11.3	0.1084307	0.1081402	0.0000969
MARS	2100-09-24 02:54	5.3	0.0407042	0.0405499	0.0000515
EARTH	2123-09-09 00:47	6.9	0.1903564	0.1901539	0.0000675

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
317.03003950	255.55276271	0.04804069	MINIMUM
41.48116850	34.98300389	0.05779293	MINIMUM
359.21405342	325.36720672	0.22676074	SADDLE
179.71130628	145.69285907	1.53322614	SADDLE
358.85706266	144.74739466	1.77520721	SADDLE
179.63941082	325.65973311	3.53448633	MAXIMUM

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MOID Plots

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