Asteroids

2011XC2 help

Last update: 2025-07-21 23:57 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.840

Aphelion (Q)

3.164

Eccentricity (e)

0.581

Inclination (i)

28.8

deg

Orbit period (P)

1034.6

Earth MOID

0.00045

U parameter

8.3

Next Earth close approach

Date

2028-11-29

Nominal distance (from Earth center)

0.06088

9107246

Maximum Brightness

20.2

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

23.1

mag

Diameter

60 - 140*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2011-12-08

Observatory

Lincoln Laboratory ETS, New Mexico

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.001936

1-sigma variation

0.003049

Unit

Eccentricity (e)

Value

0.580602

1-sigma variation

0.000672

Unit

Inclination (i)

Value

28.8072

1-sigma variation

0.0186

Unit

Long. of Ascending Node (Ω)

Value

70.6167

1-sigma variation

0.0017

Unit

Arg. of Perihelion (ω)

Value

306.6575

1-sigma variation

0.0133

Unit

Mean Anomaly (M)

Value

278.88558

1-sigma variation

4.00903

Unit

Perihelion distance

Value

0.839608

1-sigma variation

Unit

Aphelion distance

Value

3.164264

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.000557

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.017560

1-sigma variation

Unit

MOID

Value

0.000454

1-sigma variation

Unit

Orbit Period

Value

1034.6031

1-sigma variation

Unit

U parameter

Value

8.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.29649E-6	2.04993E-6	5.66015E-5	-4.74738E-6	4.04021E-5	-1.22236E-2
e	2.04993E-6	4.52024E-7	1.24818E-5	-1.04520E-6	8.90709E-6	-2.69537E-3
i	5.66015E-5	1.24818E-5	3.44767E-4	-2.86228E-5	2.45680E-4	-7.44232E-2
Ω	-4.74738E-6	-1.04520E-6	-2.86228E-5	2.96673E-6	-2.12170E-5	6.24206E-3
ω	4.04021E-5	8.90709E-6	2.45680E-4	-2.12170E-5	1.76231E-4	-5.31231E-2
M	-1.22236E-2	-2.69537E-3	-7.44232E-2	6.24206E-3	-5.31231E-2	1.60723E1

Date of computation: 2025-07-21 23:57 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

23.119

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

60 - 140*

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

Unit

Source

[1]

Unobserved

Value

4960

Unit

Source

[1]

Normalized RMS of residuals

Value

0.368676

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-12-08.19806

Unit

Source

[2]

Last Observation

Value

2011-12-30.386484

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

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 2011XC2 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
EARTH	1950-12-08 09:48	> 1 mo	0.0869455	0.0017321	9.3655718
EARTH	1986-12-04 14:25	> 1 w	0.0211400	0.0000067	0.3672251
EARTH	2011-12-03 15:20	1.6	0.0023221	0.0023148	0.0000024
EARTH	2028-11-29 01:01	> 1 w	0.0608782	0.0031319	0.2501764
EARTH	2045-11-22 12:39	> 1 w	0.1591439	0.0134581	0.1108316

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
29.02891888	328.89010871	0.00045353	MINIMUM
313.97759406	192.43027886	0.43729123	MINIMUM
339.28090018	236.60200645	0.48675441	SADDLE
353.79125552	87.23802266	1.79842300	SADDLE
175.39990437	95.95003763	2.27692298	SADDLE
181.98199852	279.46180328	4.10298954	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2011XC2

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS	TS
2056-12-02.413	72334.413	-2.995	0.000	0.41 ± 0.008	1.29E4	7.40E-7	4.03E-5	-4.72	0


Based on 35 optical observations (of which 0 are rejected as outliers) from 2011/12/08.198 to 2011/12/30.386.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.14 and 1.14 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250305 083405.365 UTC.

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Download Impactor Table as: