Asteroids

2018FE4

Last update: 2023-09-26 15:19 UTC

Orbital Properties

Epoch

60200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.650

Aphelion (Q)

2.644

Eccentricity (e)

0.605

Inclination (i)

19.2

deg

Orbit period (P)

772.0

Earth MOID

0.00675

U parameter

8.0

Next Earth close approach

Date

2037-04-05

Nominal distance (from Earth center)

0.13818

20671299

Maximum Brightness

23.1

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

24.7

mag

Diameter

40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-03-21

Observatory

Mt. Lemmon Survey

Orbit Visualiser

Click the button to start Orbit Visualiser

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion
Aphelion
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

60200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.646940

1-sigma variation

0.001256

Unit

Eccentricity (e)

Value

0.605107

1-sigma variation

0.000538

Unit

Inclination (i)

Value

19.2061

1-sigma variation

0.0207

Unit

Ascending Node (Ω)

Value

183.6489

1-sigma variation

0.0020

Unit

Arg. of Perihelion (ω)

Value

92.5382

1-sigma variation

0.0528

Unit

Mean Anomaly (M)

Value

186.21466

1-sigma variation

1.76697

Unit

Perihelion

Value

0.650365

1-sigma variation

Unit

Aphelion

Value

2.643515

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.074135

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.014125

1-sigma variation

Unit

MOID

Value

0.006749

1-sigma variation

Unit

Orbit Period

Value

771.9961

1-sigma variation

Unit

U parameter

Value

8.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.57768E-6	6.75683E-7	2.59628E-5	2.52189E-6	-6.62785E-5	-2.21941E-3
e	6.75683E-7	2.89379E-7	1.11193E-5	1.08007E-6	-2.83855E-5	-9.50521E-4
i	2.59628E-5	1.11193E-5	4.27254E-4	4.15012E-5	-1.09070E-3	-3.65234E-2
Ω	2.52189E-6	1.08007E-6	4.15012E-5	4.03123E-6	-1.05945E-4	-3.54769E-3
ω	-6.62785E-5	-2.83855E-5	-1.09070E-3	-1.05945E-4	2.78437E-3	9.32376E-2
M	-2.21941E-3	-9.50521E-4	-3.65234E-2	-3.54769E-3	9.32376E-2	3.12217E0

Date of computation: 2023-08-01 23:50 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

24.71

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

Unit

Source

[-]

Diameter

Value

40*

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 ODIM	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

2006

Unit

Source

[1]

Astrometry Summary

RMS of Residuals
First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

RMS of Residuals

Value

0.62786

Unit

arcsec

Source

[1]

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2123

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1950-10-03 22:27	> 1 mo	0.1647797	0.0100838	1.8362868
EARTH	1963-03-21 06:33	> 1 w	0.1860598	0.0284256	0.2251415
EARTH	1967-09-25 05:39	> 1 mo	0.0210755	0.0117000	0.7740228
EARTH	1999-03-24 00:42	> 1 d	0.1300027	0.0253822	0.0777663
EARTH	2003-09-25 16:52	> 1 w	0.0132574	0.0085274	0.1531811
EARTH	2018-03-29 15:07	< 1 s	0.0339222	0.0338197	0.0000342
EARTH	2022-09-28 13:17	> 1 d	0.0490998	0.0064546	0.0565503
EARTH	2037-04-05 08:30	> 1 w	0.1381791	0.0320813	0.1539939
EARTH	2073-03-20 20:43	> 1 w	0.1891129	0.0347711	0.2666224
EARTH	2077-09-19 15:01	> 1 w	0.1116549	0.0013663	0.2766117
EARTH	2092-03-27 22:21	> 1 w	0.0506951	0.0406215	0.1210485
EARTH	2096-09-26 19:54	> 1 w	0.0193387	0.0004516	0.1927605

Download as:

2018FE4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2085-09-26.066	82859.066	-3.347	0.80 ± 0.014	4.25E6	5.60E-10	2.83E-9	-8.97
2085-09-26.070	82859.070	-3.338	0.31 ± 0.014	1.08E6	3.08E-9	1.56E-8	-8.23
2098-09-26.171	87607.171	0.887	1.04 ± 0.014	7.04E5	3.70E-7	1.94E-6	-6.22
2098-09-26.172	87607.172	0.894	1.01 ± 0.014	1.32E6	2.88E-7	1.50E-6	-6.33
2098-09-26.180	87607.180	0.346	0.32 ± 0.013	8.97E5	9.16E-7	4.77E-6	-5.83
2100-09-26.693	88337.693	-0.633	0.84 ± 0.014	4.86E6	1.05E-7	5.42E-7	-6.78
2100-09-26.693	88337.693	-0.771	0.89 ± 0.021	1.59E7	2.74E-8	1.41E-7	-7.37
2101-09-26.902	88702.902	4.047	0.37 ± 0.014	9.92E5	2.40E-10	1.29E-9	-9.42


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.
Aegis software version= 4.0, Date of computation=20220708 172058.259 UTC.

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