Asteroids

2018MX4 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.018

Aphelion (Q)

3.571

Eccentricity (e)

0.556

Inclination (i)

0.8

deg

Orbit period (P)

1269.5

Earth MOID

0.00283

U parameter

8.4

Next Earth close approach

Date

2098-08-26

Nominal distance (from Earth center)

0.17694

26470379

Maximum Brightness

25.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.9

mag

Diameter

11 - 25*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-06-17

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.294484

1-sigma variation

0.006910

Unit

Eccentricity (e)

Value

0.556149

1-sigma variation

0.001089

Unit

Inclination (i)

Value

0.8444

1-sigma variation

0.1211

Unit

Long. of Ascending Node (Ω)

Value

99.9883

1-sigma variation

0.1887

Unit

Arg. of Perihelion (ω)

Value

190.2812

1-sigma variation

1.4704

Unit

Mean Anomaly (M)

Value

94.57987

1-sigma variation

1.11006

Unit

Perihelion distance

Value

1.018409

1-sigma variation

Unit

Aphelion distance

Value

3.570558

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.514245

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.007696

1-sigma variation

Unit

MOID

Value

0.002835

1-sigma variation

Unit

Orbit Period

Value

1269.4800

1-sigma variation

Unit

U parameter

Value

8.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.77422E-5	7.52252E-6	8.36640E-4	1.30363E-3	-1.01602E-2	7.67003E-3
e	7.52252E-6	1.18529E-6	1.31826E-4	2.05407E-4	-1.60090E-3	1.20853E-3
i	8.36640E-4	1.31826E-4	1.46614E-2	2.28449E-2	-1.78048E-1	1.34410E-1
Ω	1.30363E-3	2.05407E-4	2.28449E-2	3.55963E-2	-2.77430E-1	2.09434E-1
ω	-1.01602E-2	-1.60090E-3	-1.78048E-1	-2.77430E-1	2.16223E0	-1.63229E0
M	7.67003E-3	1.20853E-3	1.34410E-1	2.09434E-1	-1.63229E0	1.23223E0

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

26.88

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

11 - 25*

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

2903

Unit

Source

[1]

Normalized RMS of residuals

Value

0.556675

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-06-17.31332

Unit

Source

[2]

Last Observation

Value

2018-06-27.077682

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

30 (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

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 2018MX4 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	1951-07-13 13:10	> 1 mo	0.0058805	0.0014673	0.0358937
EARTH	1958-08-18 16:44	> 1 mo	0.1353703	0.0078157	0.4675130
EARTH	2018-06-27 18:21	< 1 s	0.0141727	0.0141400	0.0000109
EARTH	2025-07-02 06:07	> 1 w	0.0070799	0.0017224	0.0215602
EARTH	2098-08-26 09:53	> 1 mo	0.1769436	0.0088995	0.8085939
EARTH	2105-07-06 14:43	> 1 mo	0.0027502	0.0015205	0.1325105
MARS	2112-02-02 02:36	> 1 mo	0.0296515	0.0086172	4.3567596

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
357.70573591	184.73530065	0.00186087	MINIMUM
359.78539527	8.69062534	2.00175797	SADDLE
179.93834054	8.87270112	2.58678380	SADDLE
179.93418978	188.86903862	4.58848131	MAXIMUM

Download:

MOID Plots

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