Asteroids

2018MD7 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.843

Aphelion (Q)

1.051

Eccentricity (e)

0.110

Inclination (i)

8.2

deg

Orbit period (P)

336.7

Earth MOID

0.00273

U parameter

2.7

Next Earth close approach

Date

2029-12-25

Nominal distance (from Earth center)

0.16738

25040330

Maximum Brightness

25.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

22.5

mag

Diameter

80 - 190*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-06-21

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

0.947092

1-sigma variation

1.662E-7

Unit

Eccentricity (e)

Value

0.109821

1-sigma variation

3.314E-7

Unit

Inclination (i)

Value

8.2298

1-sigma variation

3.175E-5

Unit

Long. of Ascending Node (Ω)

Value

134.3194

1-sigma variation

1.560E-5

Unit

Arg. of Perihelion (ω)

Value

313.4895

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

207.37706

1-sigma variation

0.00077

Unit

Perihelion distance

Value

0.843081

1-sigma variation

Unit

Aphelion distance

Value

1.051103

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.116343

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.003090

1-sigma variation

Unit

MOID

Value

0.002730

1-sigma variation

Unit

Orbit Period

Value

336.6563

1-sigma variation

Unit

U parameter

Value

2.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.76325E-14	-5.01293E-14	-4.12522E-12	-1.15393E-12	2.66925E-12	-1.26717E-10
e	-5.01293E-14	1.09856E-13	1.00066E-11	3.26740E-12	-1.21050E-11	2.39447E-10
i	-4.12522E-12	1.00066E-11	1.00783E-9	3.14930E-10	-1.27355E-9	2.01227E-8
Ω	-1.15393E-12	3.26740E-12	3.14930E-10	2.43385E-10	-6.31328E-10	5.84300E-9
ω	2.66925E-12	-1.21050E-11	-1.27355E-9	-6.31328E-10	3.36452E-9	-1.61689E-8
M	-1.26717E-10	2.39447E-10	2.01227E-8	5.84300E-9	-1.61689E-8	5.86237E-7

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

22.529

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

80 - 190*

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

Radar R

Unit

Source

[3]

Download this part as:

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude
[3]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

467

Unit

Source

[1]

Unobserved

Value

2610

Unit

Source

[1]

Normalized RMS of residuals

Value

0.5772

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-04-23.1399

Unit

Source

[2]

Last Observation

Value

2018-08-03.550813

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

67 (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

2018-08-01

Unit

Source

[3]

Last Observation

Value

2018-08-01

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (0)

Unit

Source

[1]

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
[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 2018MD7 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	1955-03-01 07:50	430.9	0.0946405	0.0943179	0.0001229
EARTH	1955-07-19 20:31	279.1	0.1198612	0.1173812	0.0008280
EARTH	1969-01-23 21:33	14.5	0.1240925	0.1240816	0.0000036
EARTH	1969-08-07 12:38	< 1 min	0.0133609	0.0132989	0.0000206
EARTH	1981-02-18 03:49	5.4	0.1038902	0.1038844	0.0000019
EARTH	1981-08-03 06:54	1.6	0.0561200	0.0560857	0.0000115
EARTH	1993-03-23 16:53	4.1	0.1343192	0.1342847	0.0000115
EARTH	1993-11-20 01:37	30.7	0.1844672	0.1844661	0.0000004
EARTH	2006-01-07 05:02	15.7	0.1520822	0.1520637	0.0000062
EARTH	2006-08-06 10:23	< 1 min	0.1060820	0.1060243	0.0000192
EARTH	2018-01-21 14:04	< 1 min	0.1336754	0.1336737	0.0000005
EARTH	2018-08-07 05:39	< 1 s	0.0588633	0.0588627	0.0000002
EARTH	2029-12-25 14:26	17.0	0.1673843	0.1673676	0.0000055
EARTH	2030-08-05 00:40	< 1 min	0.1687777	0.1687215	0.0000187
EARTH	2041-03-17 20:40	9.9	0.1203066	0.1202727	0.0000113
EARTH	2041-07-09 09:10	8.3	0.1378052	0.1377372	0.0000227
EARTH	2053-02-10 03:43	20.6	0.1111941	0.1111730	0.0000071
EARTH	2053-08-06 00:16	< 1 min	0.0043036	0.0042279	0.0000253
EARTH	2068-02-22 07:53	> 1 d	0.0840102	0.0833877	0.0007545
EARTH	2068-07-28 13:14	1024.7	0.1011330	0.0836173	0.0058554
EARTH	2083-03-27 05:10	1108.1	0.1924945	0.1658633	0.0092544
EARTH	2084-01-04 02:02	> 1 d	0.1405856	0.1286754	0.0048195
EARTH	2084-08-05 01:07	265.9	0.0796940	0.0471989	0.0108317
EARTH	2099-01-29 23:13	> 1 d	0.1008341	0.0923753	0.0039052
EARTH	2099-08-05 23:04	170.4	0.0076577	0.0020872	0.0098926
EARTH	2117-03-18 03:12	> 1 mo	0.1827784	0.0945768	1.3901923
EARTH	2118-01-15 06:52	> 1 mo	0.1153608	0.0935467	0.8873995
EARTH	2118-08-06 10:46	> 1 d	0.0101942	0.0023246	1.5771960

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
230.97062299	212.30851780	0.00133772	MINIMUM
63.95239428	54.28018396	0.10385207	MINIMUM
137.24080008	126.23477944	0.14596631	SADDLE
332.44369799	315.84328826	0.18525059	SADDLE
353.53401401	159.04791935	1.85583060	SADDLE
180.70734011	346.29760016	2.03252137	MAXIMUM

Download:

MOID Plots

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