Asteroids

2011GA help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.736

Aphelion (Q)

2.864

Eccentricity (e)

0.591

Inclination (i)

9.8

deg

Orbit period (P)

882.1

Earth MOID

0.00722

U parameter

0.0

Next Earth close approach

Date

2028-05-10

Nominal distance (from Earth center)

0.11333

16953347

Maximum Brightness

18.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.7

mag

Diameter

190 - 400*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-04-01

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

1.799975

1-sigma variation

7.436E-9

Unit

Eccentricity (e)

Value

0.591140

1-sigma variation

3.484E-8

Unit

Inclination (i)

Value

9.8271

1-sigma variation

6.794E-6

Unit

Long. of Ascending Node (Ω)

Value

200.3307

1-sigma variation

5.723E-6

Unit

Arg. of Perihelion (ω)

Value

109.7080

1-sigma variation

9.692E-6

Unit

Mean Anomaly (M)

Value

53.69261

1-sigma variation

2.086E-6

Unit

Perihelion distance

Value

0.735937

1-sigma variation

Unit

Aphelion distance

Value

2.864012

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.460585

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.021682

1-sigma variation

Unit

MOID

Value

0.007221

1-sigma variation

Unit

Orbit Period

Value

882.0599

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.52945E-17	2.27631E-16	-1.46197E-15	-6.33316E-15	-4.27538E-14	-1.52098E-14
e	2.27631E-16	1.21352E-15	1.71781E-14	5.38251E-15	-2.71946E-13	-5.69266E-14
i	-1.46197E-15	1.71781E-14	4.61614E-11	2.72562E-11	-2.89212E-11	-8.84172E-14
Ω	-6.33316E-15	5.38251E-15	2.72562E-11	3.27576E-11	-3.38994E-11	2.44262E-12
ω	-4.27538E-14	-2.71946E-13	-2.89212E-11	-3.38994E-11	9.39297E-11	9.62443E-12
M	-1.52098E-14	-5.69266E-14	-8.84172E-14	2.44262E-12	9.62443E-12	4.35158E-12

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

20.74

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

190 - 400*

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

4614

Unit

Source

[1]

Unobserved

Value

948

Unit

Source

[1]

Normalized RMS of residuals

Value

0.507597

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-04-01.33339

Unit

Source

[2]

Last Observation

Value

2023-11-18.321584

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

173 (2)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2023-10-16

Unit

Source

[3]

Last Observation

Value

2023-10-18

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

4 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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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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 2011GA 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	1960-10-19 13:04	1.0	0.0674905	0.0674540	0.0000122
EARTH	1965-05-27 20:58	1.4	0.1843944	0.1843740	0.0000068
EARTH	1977-10-13 19:58	< 1 min	0.0249395	0.0249346	0.0000016
EARTH	1982-05-14 15:06	< 1 min	0.0953577	0.0953571	0.0000002
EARTH	2023-10-15 07:08	< 1 s	0.0174333	0.0174333	0.0000000
EARTH	2028-05-10 08:30	< 1 s	0.1133261	0.1133254	0.0000002
EARTH	2052-09-30 07:06	< 1 min	0.1533863	0.1533834	0.0000009
EARTH	2093-10-18 23:58	< 1 min	0.0405220	0.0405190	0.0000010
EARTH	2098-05-15 12:44	< 1 s	0.1032014	0.1032012	0.0000001
EARTH	2122-10-16 04:09	< 1 min	0.0296340	0.0296210	0.0000044

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
40.83923355	282.25177551	0.00711963	MINIMUM
316.04777463	130.56997147	0.09670718	MINIMUM
357.09764948	203.76223957	0.31430722	SADDLE
358.78349298	27.18201078	1.71587224	SADDLE
179.40463333	28.52488793	1.89709229	SADDLE
179.95958824	208.80284690	3.86950475	MAXIMUM

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MOID Plots

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