Asteroids

2018LE1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.812

Aphelion (Q)

1.233

Eccentricity (e)

0.206

Inclination (i)

1.8

deg

Orbit period (P)

377.6

Earth MOID

0.00113

U parameter

5.8

Next Earth close approach

Date

2044-11-14

Nominal distance (from Earth center)

0.07116

10645571

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

27.5

mag

Diameter

8 - 19*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-06-05

Observatory

Pan-STARRS 1, Haleakala

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

1.022477

1-sigma variation

0.000019

Unit

Eccentricity (e)

Value

0.205876

1-sigma variation

0.000063

Unit

Inclination (i)

Value

1.8048

1-sigma variation

0.0006

Unit

Long. of Ascending Node (Ω)

Value

245.3777

1-sigma variation

0.0008

Unit

Arg. of Perihelion (ω)

Value

262.2342

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

161.99580

1-sigma variation

0.08290

Unit

Perihelion distance

Value

0.811974

1-sigma variation

Unit

Aphelion distance

Value

1.232981

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.007267

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.034399

1-sigma variation

Unit

MOID

Value

0.001135

1-sigma variation

Unit

Orbit Period

Value

377.6409

1-sigma variation

Unit

U parameter

Value

5.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.71199E-10	1.22247E-9	1.15552E-8	1.39905E-8	-2.71135E-9	-1.59728E-6
e	1.22247E-9	4.03077E-9	3.81058E-8	4.65893E-8	-9.40328E-9	-5.26091E-6
i	1.15552E-8	3.81058E-8	3.60277E-7	4.41244E-7	-8.96539E-8	-4.97287E-5
Ω	1.39905E-8	4.65893E-8	4.41244E-7	5.87827E-7	-1.55581E-7	-6.02678E-5
ω	-2.71135E-9	-9.40328E-9	-8.96539E-8	-1.55581E-7	6.84643E-8	1.17262E-5
M	-1.59728E-6	-5.26091E-6	-4.97287E-5	-6.02678E-5	1.17262E-5	6.87321E-3

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

27.511

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

8 - 19*

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

Unit

Source

[1]

Unobserved

Value

2648

Unit

Source

[1]

Normalized RMS of residuals

Value

0.642595

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-06-05.39422

Unit

Source

[2]

Last Observation

Value

2018-06-21.385419

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

56 (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

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 2018LE1 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	1957-11-20 09:19	> 1 d	0.1066930	0.0326792	0.0246823
EARTH	1958-10-14 05:02	> 1 w	0.1814450	0.1469940	0.0114983
EARTH	1959-01-28 19:11	> 1 w	0.1560051	0.1364562	0.0065358
EARTH	1960-04-30 14:09	> 1 w	0.1129044	0.0606462	0.0175664
EARTH	1961-06-08 07:19	1247.4	0.1949829	0.1264880	0.0228323
EARTH	1978-11-26 14:16	84.1	0.0169096	0.0150783	0.0006111
EARTH	1980-03-08 11:12	1061.2	0.1655408	0.1649978	0.0001810
EARTH	1981-05-31 21:01	82.6	0.0752211	0.0713142	0.0013023
EARTH	1997-10-30 07:46	1392.1	0.1489438	0.1457998	0.0010481
EARTH	1998-01-10 18:18	> 1 d	0.1336668	0.1315892	0.0006928
EARTH	1999-04-24 08:40	> 1 d	0.1183775	0.1149067	0.0011573
EARTH	1999-06-08 18:19	1321.5	0.1264173	0.1216776	0.0015801
EARTH	2015-11-23 13:56	10.4	0.0488024	0.0487664	0.0000120
EARTH	2017-02-18 23:17	5.8	0.1677028	0.1675295	0.0000578
EARTH	2018-05-28 12:53	< 1 min	0.0040958	0.0040917	0.0000014
EARTH	2044-11-14 05:51	296.4	0.0711612	0.0567494	0.0048079
EARTH	2045-10-29 04:28	> 1 d	0.1292413	0.1193283	0.0033046
EARTH	2045-12-23 21:29	> 1 d	0.1248909	0.1167037	0.0027328
EARTH	2047-02-19 08:31	> 1 d	0.1790338	0.1784300	0.0002013
EARTH	2048-04-14 20:26	> 1 d	0.1368003	0.1328418	0.0013203
EARTH	2048-06-23 02:30	> 1 d	0.1426077	0.1374205	0.0017292
EARTH	2049-05-30 22:34	180.7	0.0497783	0.0441473	0.0018770
EARTH	2074-11-13 21:01	> 1 d	0.1023226	0.0204681	0.0274399
EARTH	2075-11-09 16:14	> 1 w	0.1124784	0.0397854	0.0242339
EARTH	2075-12-14 16:35	> 1 w	0.1105846	0.0491410	0.0208547
EARTH	2077-02-17 03:50	> 1 w	0.1781389	0.1749624	0.0010603
EARTH	2078-04-16 14:45	> 1 w	0.1346942	0.0990894	0.0119293
EARTH	2078-06-22 04:47	> 1 w	0.1405822	0.0949539	0.0152352
EARTH	2079-06-01 01:13	1358.1	0.0633199	0.0059403	0.0191620
EARTH	2103-11-12 05:59	> 1 d	0.1705855	0.0054734	0.1188390
EARTH	2104-11-22 00:27	> 1 d	0.0525930	0.0050608	0.1218835
EARTH	2106-02-07 21:25	> 1 mo	0.1733949	0.1324133	0.0137867
EARTH	2107-04-07 11:15	> 1 mo	0.1471609	0.0676562	0.0273286
EARTH	2107-07-01 11:34	> 1 mo	0.1580994	0.0397739	0.0397857
EARTH	2108-05-31 07:00	> 1 d	0.0497143	0.0005645	0.0440965

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
87.44148787	144.19226742	0.00082975	MINIMUM
279.48265122	313.61869796	0.00564593	MINIMUM
4.22944963	49.70738004	0.17910222	SADDLE
182.82880034	228.23344451	0.22463151	SADDLE
4.23255975	229.69283094	1.82270069	SADDLE
182.64555468	48.07085150	2.22143173	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2018LE1

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2102-05-26.872	88944.872	-3.628	0.000	1.16 ± 0.005	5.14E4	4.07E-8	2.31E-2	-9.06	0


Based on 56 optical observations (of which 1 are rejected as outliers) from 2018/06/05.394 to 2018/06/21.385.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 2.14 and 2.14 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: