Asteroids

549948 2011WL2 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.772

Aphelion (Q)

1.383

Eccentricity (e)

0.283

Inclination (i)

14.1

deg

Orbit period (P)

408.6

Earth MOID

0.00129

U parameter

0.1

Next Earth close approach

Date

2030-10-29

Nominal distance (from Earth center)

0.08575

12827938

Maximum Brightness

18.6

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

2011-11-16

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.077585

1-sigma variation

2.900E-9

Unit

Eccentricity (e)

Value

0.283417

1-sigma variation

1.247E-7

Unit

Inclination (i)

Value

14.1311

1-sigma variation

6.625E-6

Unit

Long. of Ascending Node (Ω)

Value

212.9001

1-sigma variation

2.331E-5

Unit

Arg. of Perihelion (ω)

Value

88.8670

1-sigma variation

2.143E-5

Unit

Mean Anomaly (M)

Value

84.47104

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.772179

1-sigma variation

Unit

Aphelion distance

Value

1.382990

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.019780

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.002051

1-sigma variation

Unit

MOID

Value

0.001291

1-sigma variation

Unit

Orbit Period

Value

408.5787

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.41239E-18	-2.56304E-16	-7.36971E-15	9.99382E-15	2.41373E-14	-6.03817E-14
e	-2.56304E-16	1.55433E-14	3.37716E-13	4.47228E-13	-6.84382E-13	-2.37307E-13
i	-7.36971E-15	3.37716E-13	4.38881E-11	7.15853E-11	-1.06374E-10	4.74591E-11
Ω	9.99382E-15	4.47228E-13	7.15853E-11	5.43376E-10	-2.56118E-10	-4.73571E-10
ω	2.41373E-14	-6.84382E-13	-1.06374E-10	-2.56118E-10	4.59078E-10	-3.27865E-10
M	-6.03817E-14	-2.37307E-13	4.74591E-11	-4.73571E-10	-3.27865E-10	1.43595E-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

20.735

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

[-]

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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

3931

Unit

Source

[1]

Unobserved

Value

2007

Unit

Source

[1]

Normalized RMS of residuals

Value

0.515598

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2010-04-14.17699

Unit

Source

[2]

Last Observation

Value

2021-01-17.35134

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

286 (1)

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 549948 2011WL2 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	1954-04-17 11:30	< 1 min	0.0781061	0.0780948	0.0000038
EARTH	1974-10-31 19:34	< 1 min	0.1333166	0.1333138	0.0000009
EARTH	1982-04-28 23:36	< 1 min	0.1342705	0.1342687	0.0000006
EARTH	1983-10-24 23:44	< 1 min	0.0340644	0.0340623	0.0000007
EARTH	1991-04-17 15:45	< 1 min	0.0793133	0.0793107	0.0000009
EARTH	2010-04-29 07:26	< 1 min	0.1387187	0.1387170	0.0000006
EARTH	2011-10-24 17:32	< 1 min	0.0438326	0.0438323	0.0000001
EARTH	2019-04-14 06:45	< 1 min	0.1505566	0.1505550	0.0000005
EARTH	2030-10-29 23:40	< 1 min	0.0857495	0.0857479	0.0000005
EARTH	2038-04-21 04:00	< 1 min	0.0120685	0.0120682	0.0000001
EARTH	2039-10-18 09:25	< 1 min	0.1956831	0.1956786	0.0000015
EARTH	2057-04-25 08:21	1.2	0.0824826	0.0824381	0.0000148
EARTH	2058-10-21 23:02	< 1 min	0.1057635	0.1057187	0.0000149
EARTH	2076-05-02 21:50	< 1 min	0.1830899	0.1830730	0.0000056
EARTH	2077-10-25 22:53	< 1 min	0.0056860	0.0056728	0.0000044
EARTH	2086-05-02 13:43	37.6	0.1750577	0.1741061	0.0003172
EARTH	2087-10-23 07:06	20.2	0.0833651	0.0822414	0.0003746
EARTH	2096-04-24 06:31	43.3	0.0843299	0.0828243	0.0005021
EARTH	2097-10-19 02:28	15.3	0.1771625	0.1756226	0.0005133
EARTH	2106-04-21 02:45	31.4	0.0180284	0.0179363	0.0000453
EARTH	2116-04-13 23:56	245.4	0.1401761	0.1283363	0.0039507

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
74.36103074	292.25383560	0.00151657	MINIMUM
285.17516560	108.25572767	0.01364923	MINIMUM
359.62692353	200.38322007	0.32780216	SADDLE
179.88126461	20.08780269	0.49098251	SADDLE
358.85475857	19.27918637	1.74360905	SADDLE
178.99029732	199.40158569	2.38232185	MAXIMUM

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MOID Plots

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