Asteroids

2018FE4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.651

Aphelion (Q)

2.644

Eccentricity (e)

0.605

Inclination (i)

19.2

deg

Orbit period (P)

772.3

Earth MOID

0.00631

U parameter

8.0

Next Earth close approach

Date

2037-04-05

Nominal distance (from Earth center)

0.13819

20673215

Maximum Brightness

23.1

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

24.7

mag

Diameter

30 - 70*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-03-21

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

1.647398

1-sigma variation

0.001180

Unit

Eccentricity (e)

Value

0.604929

1-sigma variation

0.000524

Unit

Inclination (i)

Value

19.2004

1-sigma variation

0.0205

Unit

Long. of Ascending Node (Ω)

Value

183.5554

1-sigma variation

0.0035

Unit

Arg. of Perihelion (ω)

Value

92.6550

1-sigma variation

0.0536

Unit

Mean Anomaly (M)

Value

199.18740

1-sigma variation

2.17521

Unit

Perihelion distance

Value

0.650840

1-sigma variation

Unit

Aphelion distance

Value

2.643957

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.076418

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.013206

1-sigma variation

Unit

MOID

Value

0.006308

1-sigma variation

Unit

Orbit Period

Value

772.3183

1-sigma variation

Unit

U parameter

Value

8.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.39343E-6	6.18089E-7	2.42057E-5	4.16587E-6	-6.32899E-5	-2.56769E-3
e	6.18089E-7	2.74169E-7	1.07370E-5	1.84788E-6	-2.80738E-5	-1.13896E-3
i	2.42057E-5	1.07370E-5	4.20488E-4	7.23670E-5	-1.09943E-3	-4.46043E-2
Ω	4.16587E-6	1.84788E-6	7.23670E-5	1.24546E-5	-1.89215E-4	-7.67652E-3
ω	-6.32899E-5	-2.80738E-5	-1.09943E-3	-1.89215E-4	2.87465E-3	1.16625E-1
M	-2.56769E-3	-1.13896E-3	-4.46043E-2	-7.67652E-3	1.16625E-1	4.73152E0

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

24.677

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

30 - 70*

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

2770

Unit

Source

[1]

Normalized RMS of residuals

Value

0.627886

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-03-20.4591

Unit

Source

[2]

Last Observation

Value

2018-03-30.585238

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

32 (2)

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 2018FE4 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	1950-10-03 22:18	> 1 mo	0.1646366	0.0100894	1.8475200
EARTH	1963-03-21 06:35	> 1 w	0.1860420	0.0282404	0.2321656
EARTH	1967-09-25 05:45	> 1 mo	0.0210151	0.0117004	0.7832884
EARTH	1999-03-24 00:42	> 1 d	0.1300092	0.0253040	0.0760676
EARTH	2003-09-25 16:51	> 1 w	0.0132698	0.0085272	0.1532877
EARTH	2018-03-29 15:07	< 1 s	0.0339222	0.0338197	0.0000342
EARTH	2022-09-28 13:18	> 1 d	0.0491040	0.0064544	0.0565516
EARTH	2037-04-05 08:31	> 1 w	0.1381919	0.0320803	0.1540132
EARTH	2073-03-20 20:45	> 1 w	0.1890902	0.0347721	0.2666670
EARTH	2077-09-19 15:03	> 1 w	0.1116317	0.0013648	0.2766532
EARTH	2092-03-27 22:22	> 1 w	0.0506847	0.0406216	0.1209886
EARTH	2096-09-26 19:55	> 1 w	0.0193551	0.0004519	0.1927747

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
49.94444600	261.32708307	0.00688711	MINIMUM
309.38326252	85.48245963	0.03453049	MINIMUM
359.52899283	172.91288971	0.45517762	SADDLE
359.97645224	353.89954444	1.61232250	SADDLE
179.83048258	354.05820182	1.74481711	SADDLE
180.16114795	174.23192540	3.61901249	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2018FE4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2085-09-26.066	82859.066	-3.347	0.80 ± 0.014	4.25E6	5.60E-10	5.05E0	-8.95
2085-09-26.070	82859.070	-3.338	0.31 ± 0.014	1.08E6	3.08E-9	5.06E0	-8.21
2098-09-26.171	87607.171	0.887	1.04 ± 0.014	7.04E5	3.70E-7	5.24E0	-6.20
2098-09-26.172	87607.172	0.894	1.01 ± 0.014	1.32E6	2.88E-7	5.21E0	-6.31
2098-09-26.180	87607.180	0.346	0.32 ± 0.013	8.97E5	9.16E-7	5.21E0	-5.81
2100-09-26.693	88337.693	-0.633	0.84 ± 0.014	4.86E6	1.05E-7	5.16E0	-6.76
2100-09-26.693	88337.693	-0.771	0.89 ± 0.021	1.59E7	2.74E-8	5.15E0	-7.35
2101-09-26.902	88702.902	4.047	0.37 ± 0.014	9.92E5	2.40E-10	5.38E0	-9.40


Based on 32 optical observations (of which 2 are rejected as outliers) from 2018/03/20.459 to 2018/03/30.585.
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=20250805 130500.123 UTC.

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Download Impactor Table as: