Asteroids

2021LE help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.805

Aphelion (Q)

1.608

Eccentricity (e)

0.333

Inclination (i)

1.0

deg

Orbit period (P)

484.2

Earth MOID

0.01403

U parameter

7.3

Next Earth close approach

Date

2054-11-14

Nominal distance (from Earth center)

0.07336

10974504

Maximum Brightness

22.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.1

mag

Diameter

26 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-06-01

Observatory

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.206669

1-sigma variation

0.000297

Unit

Eccentricity (e)

Value

0.332896

1-sigma variation

0.000315

Unit

Inclination (i)

Value

0.9568

1-sigma variation

0.0011

Unit

Long. of Ascending Node (Ω)

Value

168.1709

1-sigma variation

0.0249

Unit

Arg. of Perihelion (ω)

Value

162.7788

1-sigma variation

0.0276

Unit

Mean Anomaly (M)

Value

87.86695

1-sigma variation

0.51360

Unit

Perihelion distance

Value

0.804973

1-sigma variation

Unit

Aphelion distance

Value

1.608364

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.579421

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.193328

1-sigma variation

Unit

MOID

Value

0.014027

1-sigma variation

Unit

Orbit Period

Value

484.1505

1-sigma variation

Unit

U parameter

Value

7.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.82647E-8	9.32733E-8	3.28098E-7	-3.86694E-6	6.19020E-6	-1.52587E-4
e	9.32733E-8	9.89681E-8	3.49260E-7	-3.67717E-6	6.19758E-6	-1.61259E-4
i	3.28098E-7	3.49260E-7	1.23595E-6	-1.16961E-5	2.07455E-5	-5.67284E-4
Ω	-3.86694E-6	-3.67717E-6	-1.16961E-5	6.20682E-4	-6.55961E-4	6.67089E-3
ω	6.19020E-6	6.19758E-6	2.07455E-5	-6.55961E-4	7.63007E-4	-1.06895E-2
M	-1.52587E-4	-1.61259E-4	-5.67284E-4	6.67089E-3	-1.06895E-2	2.63784E-1

Date of computation: 2025-09-10 00:30 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

25.086

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

26 - 60*

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

1571

Unit

Source

[1]

Normalized RMS of residuals

Value

0.633929

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-06-01.21079

Unit

Source

[2]

Last Observation

Value

2021-06-03.20637

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

21 (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 2021LE 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	1956-11-10 09:07	> 1 w	0.0312732	0.0135485	0.1198828
EARTH	1960-10-16 00:59	> 1 w	0.1317409	0.0254868	0.0376365
EARTH	1968-07-28 05:07	> 1 mo	0.1938622	0.1125687	0.0277918
EARTH	1972-06-11 03:29	> 1 mo	0.0906026	0.0167127	0.1779958
EARTH	1976-05-27 05:40	> 1 w	0.0710296	0.0166145	0.2275391
EARTH	2001-11-11 15:48	> 1 d	0.0413910	0.0138424	0.0421575
EARTH	2005-10-27 07:00	> 1 w	0.0996928	0.0150096	0.0372902
EARTH	2009-09-15 10:00	> 1 w	0.1901210	0.1630205	0.0090860
EARTH	2017-07-07 09:09	> 1 d	0.1594257	0.1412452	0.0060699
EARTH	2021-06-03 21:31	< 1 min	0.0323054	0.0322163	0.0000297
EARTH	2025-05-26 07:41	862.9	0.0990485	0.0662531	0.0110149
EARTH	2054-11-14 04:44	> 1 d	0.0733600	0.0141686	0.0712718
EARTH	2058-11-03 22:38	> 1 d	0.0600397	0.0144932	0.0494302
EARTH	2062-09-25 17:24	> 1 w	0.1753769	0.1490390	0.0088170
EARTH	2070-07-19 17:51	> 1 w	0.1799758	0.1441178	0.0120202
EARTH	2074-06-09 12:46	> 1 w	0.0727782	0.0170175	0.0572690
EARTH	2078-05-28 07:37	> 1 d	0.0754706	0.0169950	0.0791888
EARTH	2103-11-17 22:17	> 1 d	0.1102138	0.0263984	0.0288058
EARTH	2107-11-06 10:36	> 1 d	0.0529430	0.0304521	0.0077593
EARTH	2111-09-23 00:25	> 1 d	0.1824101	0.1661173	0.0054427
EARTH	2119-06-30 22:18	> 1 w	0.1420255	0.0229267	0.0431351
EARTH	2123-06-02 03:39	> 1 d	0.0270379	0.0170142	0.0753222

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
57.33757631	304.84137748	0.01399951	MINIMUM
298.73469548	148.30673528	0.01672807	MINIMUM
357.53182061	226.02114499	0.20591498	SADDLE
178.78054886	47.37818117	0.62016376	SADDLE
357.64500776	46.16415298	1.79395786	SADDLE
178.78009603	227.36845966	2.61992778	MAXIMUM

Download:

MOID Plots

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