Asteroids

2011ES4 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.830

Aphelion (Q)

1.363

Eccentricity (e)

0.243

Inclination (i)

3.4

deg

Orbit period (P)

419.2

Earth MOID

0.00026

U parameter

0.7

Next Earth close approach

Date

2027-03-13

Nominal distance (from Earth center)

0.01342

2008095

Maximum Brightness

19.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.8

mag

Diameter

18 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-03-02

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

1.096169

1-sigma variation

1.212E-8

Unit

Eccentricity (e)

Value

0.243246

1-sigma variation

2.110E-7

Unit

Inclination (i)

Value

3.3701

1-sigma variation

1.017E-5

Unit

Long. of Ascending Node (Ω)

Value

339.7931

1-sigma variation

1.310E-5

Unit

Arg. of Perihelion (ω)

Value

274.8112

1-sigma variation

3.068E-5

Unit

Mean Anomaly (M)

Value

66.07778

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.829530

1-sigma variation

Unit

Aphelion distance

Value

1.362808

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.001160

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.062354

1-sigma variation

Unit

MOID

Value

0.000264

1-sigma variation

Unit

Orbit Period

Value

419.1939

1-sigma variation

Unit

U parameter

Value

0.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.46793E-16	1.81514E-15	7.88018E-15	6.73115E-14	-1.94057E-13	-4.41928E-13
e	1.81514E-15	4.45321E-14	6.17280E-13	8.96292E-13	-5.92230E-12	-4.88082E-12
i	7.88018E-15	6.17280E-13	1.03384E-10	1.06515E-10	-1.88268E-10	-1.45124E-11
Ω	6.73115E-14	8.96292E-13	1.06515E-10	1.71486E-10	-2.27039E-10	-2.10692E-10
ω	-1.94057E-13	-5.92230E-12	-1.88268E-10	-2.27039E-10	9.41468E-10	4.94034E-10
M	-4.41928E-13	-4.88082E-12	-1.45124E-11	-2.10692E-10	4.94034E-10	1.35184E-9

Date of computation: 2026-06-04 23:11 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

25.843

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

18 - 40*

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

3489

Unit

Source

[1]

Unobserved

Value

2094

Unit

Source

[1]

Normalized RMS of residuals

Value

0.571206

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-02-23.261386

Unit

Source

[2]

Last Observation

Value

2020-09-12.348696

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

145 (3)

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

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 2011ES4 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	1954-07-15 10:45	5.2	0.1650783	0.1650706	0.0000026
EARTH	1962-06-09 22:13	4.2	0.1955201	0.1955198	0.0000001
EARTH	1970-05-07 21:57	3.0	0.1780330	0.1780291	0.0000013
EARTH	1978-03-21 00:19	< 1 min	0.0928061	0.0927996	0.0000022
EARTH	1986-03-10 10:16	< 1 min	0.0196087	0.0196076	0.0000004
EARTH	1987-09-09 01:47	< 1 min	0.1163322	0.1163279	0.0000014
EARTH	1995-08-06 17:20	< 1 min	0.1306214	0.1306178	0.0000012
EARTH	2003-05-25 15:42	< 1 min	0.1935879	0.1935876	0.0000001
EARTH	2011-03-13 09:52	< 1 min	0.0285754	0.0285748	0.0000002
EARTH	2012-09-10 18:43	< 1 min	0.1776404	0.1776377	0.0000009
EARTH	2019-03-04 16:11	< 1 min	0.1422562	0.1422539	0.0000008
EARTH	2020-09-02 07:47	< 1 s	0.0098865	0.0098865	0.0000000
EARTH	2027-03-13 22:46	< 1 min	0.0134233	0.0134232	0.0000000
EARTH	2035-05-01 20:13	26.5	0.1649969	0.1649573	0.0000132
EARTH	2043-06-22 00:58	47.2	0.1887530	0.1887290	0.0000080
EARTH	2051-08-24 00:52	21.9	0.0857140	0.0854678	0.0000821
EARTH	2058-03-07 01:31	4.4	0.1283722	0.1281327	0.0000798
EARTH	2059-09-07 14:20	5.0	0.0826585	0.0824420	0.0000722
EARTH	2066-03-18 06:52	< 1 min	0.0588749	0.0588520	0.0000076
EARTH	2074-05-27 03:04	67.0	0.1895632	0.1895382	0.0000084
EARTH	2082-07-29 08:58	116.5	0.1422886	0.1420024	0.0000954
EARTH	2089-03-05 13:50	11.3	0.1601875	0.1596064	0.0001937
EARTH	2090-09-06 06:21	15.0	0.0625696	0.0619854	0.0001948
EARTH	2097-03-28 08:13	5.2	0.1057625	0.1057177	0.0000149
EARTH	2105-06-20 13:42	170.5	0.1890780	0.1890018	0.0000254
EARTH	2113-09-02 07:03	41.6	0.0131104	0.0119260	0.0003948
EARTH	2120-03-04 03:49	394.3	0.1875812	0.1681848	0.0064671
EARTH	2121-09-03 02:52	730.6	0.0029336	0.0007564	0.0074843

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
71.09163950	239.10501019	0.00025765	MINIMUM
291.63484184	70.25924391	0.01322398	MINIMUM
1.58581827	154.82172278	0.19440591	SADDLE
181.02358367	334.41331782	0.38361077	SADDLE
1.91366480	335.26684542	1.81403461	SADDLE
181.29901907	154.63581083	2.37821714	MAXIMUM

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MOID Plots

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