Asteroids

2011CQ1 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.666

Aphelion (Q)

1.009

Eccentricity (e)

0.205

Inclination (i)

5.3

deg

Orbit period (P)

279.8

Earth MOID

0.00025

U parameter

6.5

Next Earth close approach

Date

2034-02-09

Nominal distance (from Earth center)

0.18808

28136566

Maximum Brightness

31.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

32.1

mag

Diameter

1.0 - 2.2*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-02-04

Observatory

University of Arizona Catalina Sky 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

0.837217

1-sigma variation

0.000037

Unit

Eccentricity (e)

Value

0.204619

1-sigma variation

0.000047

Unit

Inclination (i)

Value

5.2847

1-sigma variation

0.0012

Unit

Long. of Ascending Node (Ω)

Value

314.9279

1-sigma variation

0.0011

Unit

Arg. of Perihelion (ω)

Value

335.3175

1-sigma variation

0.0097

Unit

Mean Anomaly (M)

Value

233.45027

1-sigma variation

0.08673

Unit

Perihelion distance

Value

0.665906

1-sigma variation

Unit

Aphelion distance

Value

1.008527

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.338053

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.000388

1-sigma variation

Unit

MOID

Value

0.000248

1-sigma variation

Unit

Orbit Period

Value

279.8048

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.37370E-9	-1.72045E-9	4.48695E-8	4.23133E-8	-3.46645E-7	3.21126E-6
e	-1.72045E-9	2.20110E-9	-5.60118E-8	-5.23435E-8	4.17271E-7	-3.99522E-6
i	4.48695E-8	-5.60118E-8	1.46940E-6	1.38495E-6	-1.13894E-5	1.04995E-4
Ω	4.23133E-8	-5.23435E-8	1.38495E-6	1.31251E-6	-1.09144E-5	9.92885E-5
ω	-3.46645E-7	4.17271E-7	-1.13894E-5	-1.09144E-5	9.36166E-5	-8.20039E-4
M	3.21126E-6	-3.99522E-6	1.04995E-4	9.92885E-5	-8.20039E-4	7.52219E-3

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

32.11

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

1.0 - 2.2*

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

0.5

Unit

Source

[1]

Unobserved

Value

5620

Unit

Source

[1]

Normalized RMS of residuals

Value

0.520307

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-02-04.23507

Unit

Source

[2]

Last Observation

Value

2011-02-04.750965

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

35 (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):

* - these fields are required

Plot

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 2011CQ1 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	1950-05-05 12:06	> 1 w	0.0840549	0.0742029	0.0032969
EARTH	1956-02-22 21:53	1015.5	0.0565719	0.0535269	0.0010150
EARTH	1962-01-29 18:08	860.2	0.0617248	0.0339523	0.0092580
EARTH	1987-06-19 18:21	20.4	0.0337932	0.0326614	0.0003789
EARTH	1993-06-09 15:37	1169.6	0.0336517	0.0260317	0.0026339
EARTH	1999-01-05 07:06	> 1 d	0.1802744	0.1768629	0.0011372
EARTH	1999-04-11 15:24	> 1 d	0.0930614	0.0929425	0.0000398
EARTH	1999-07-12 19:33	> 1 d	0.1775961	0.1742580	0.0011130
EARTH	2005-02-10 06:47	230.0	0.0291810	0.0273906	0.0005968
EARTH	2011-02-04 19:38	< 1 s	0.0000792	0.0000792	0.0000000
EARTH	2024-01-26 04:40	835.3	0.0289830	0.0253993	0.0011984
EARTH	2034-02-09 21:38	42.3	0.1880813	0.1819344	0.0020491
EARTH	2036-12-14 00:06	318.0	0.0957098	0.0898814	0.0020152
EARTH	2047-01-20 12:43	> 1 d	0.0393231	0.0312737	0.0027611
EARTH	2057-01-24 13:56	> 1 d	0.0316211	0.0190566	0.0042990
EARTH	2066-12-15 13:48	274.2	0.0804976	0.0788812	0.0005466
EARTH	2074-02-11 07:41	124.9	0.1201801	0.1028495	0.0057797
EARTH	2084-01-13 14:10	> 1 d	0.0492346	0.0387451	0.0041026
EARTH	2093-12-10 02:44	7.6	0.1766017	0.1545588	0.0074658
EARTH	2101-02-08 20:47	828.9	0.0293641	0.0140272	0.0051669
EARTH	2111-01-31 00:20	> 1 d	0.0197927	0.0058534	0.0174044
EARTH	2120-12-09 22:54	93.6	0.1723456	0.0752483	0.0873731

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
209.79393762	32.79934231	0.00062391	MINIMUM
356.51380762	184.88661729	0.35380924	SADDLE
358.54103857	7.43491844	1.64930078	SADDLE
179.72824627	188.66476160	2.02613652	MAXIMUM

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MOID Plots

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