Asteroids

2018JD help

Last update: 2026-07-30 14:25 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

1.007

Aphelion (Q)

2.126

Eccentricity (e)

0.357

Inclination (i)

10.9

deg

Orbit period (P)

716.0

Earth MOID

2.542E-6

U parameter

7.0

Next Earth close approach

Date

2067-05-19

Nominal distance (from Earth center)

0.0497

7435610

Maximum Brightness

23.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

26.6

mag

Diameter

13 - 29*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-05-04

Observatory

University of Arizona 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.566310

1-sigma variation

0.000308

Unit

Eccentricity (e)

Value

0.357379

1-sigma variation

0.000128

Unit

Inclination (i)

Value

10.8597

1-sigma variation

0.0028

Unit

Long. of Ascending Node (Ω)

Value

47.4242

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

187.8670

1-sigma variation

0.0010

Unit

Mean Anomaly (M)

Value

41.61746

1-sigma variation

0.44755

Unit

Perihelion distance

Value

1.006544

1-sigma variation

Unit

Aphelion distance

Value

2.126076

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.124053

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.000002

1-sigma variation

Unit

MOID

Value

0.000003

1-sigma variation

Unit

Orbit Period

Value

716.0033

1-sigma variation

Unit

U parameter

Value

7.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.49781E-8	3.93191E-8	8.51352E-7	-1.74939E-8	2.93981E-7	-1.37928E-4
e	3.93191E-8	1.62773E-8	3.52443E-7	-7.24213E-9	1.21703E-7	-5.70994E-5
i	8.51352E-7	3.52443E-7	7.63154E-6	-1.56790E-7	2.63540E-6	-1.23634E-3
Ω	-1.74939E-8	-7.24213E-9	-1.56790E-7	3.22493E-9	-5.41300E-8	2.54047E-5
ω	2.93981E-7	1.21703E-7	2.63540E-6	-5.41300E-8	9.10774E-7	-4.26921E-4
M	-1.37928E-4	-5.70994E-5	-1.23634E-3	2.54047E-5	-4.26921E-4	2.00300E-1

Date of computation: 2026-07-30 14:25 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

26.565

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

13 - 29*

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

3103

Unit

Source

[1]

Normalized RMS of residuals

Value

0.894131

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-05-03.35963

Unit

Source

[2]

Last Observation

Value

2018-05-08.614703

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

35 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

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 2018JD 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	2014-06-18 11:24	994.4	0.1905401	0.1724682	0.0061000
EARTH	2016-05-27 19:00	951.0	0.0840752	0.0751470	0.0029974
EARTH	2018-05-06 11:37	< 1 s	0.0089722	0.0089643	0.0000026
EARTH	2067-05-19 22:12	> 1 w	0.0497040	0.0097936	0.0698005
EARTH	2069-04-16 06:38	> 1 d	0.1436809	0.0299707	0.0574172
EARTH	2120-05-25 20:51	> 1 mo	0.0730267	0.0201889	0.5582274
EARTH	2122-04-21 23:30	> 1 mo	0.1075423	0.0194405	0.5723721

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
354.56896110	122.19544578	0.00000254	MINIMUM
181.55676020	312.13357724	1.13771176	SADDLE
2.25550664	313.29019825	1.99524782	SADDLE
180.62812978	131.51614961	3.13689838	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2018JD

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2067-05-08.562	76143.562	-0.702	1.26 ± 0.000	3.05E2	2.37E-3	1.58E-1	-3.36
2067-05-08.571	76143.571	-0.701	1.52 ± 0.000	1.78E3	3.95E-4	1.58E-1	-4.13
2067-05-08.573	76143.573	-0.701	1.61 ± 0.000	1.86E3	3.62E-4	1.58E-1	-4.17
2090-05-08.264	84544.264	-0.756	1.59 ± 0.000	6.52E5	6.25E-7	1.58E-1	-7.13


Based on 35 optical observations (of which 0 are rejected as outliers) from 2018/05/03.360 to 2018/05/08.615.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.72 and 1.72 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20260805 053441.314 UTC.

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