Asteroids

2018PD20 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.727

Aphelion (Q)

1.412

Eccentricity (e)

0.320

Inclination (i)

9.5

deg

Orbit period (P)

404.2

Earth MOID

0.00061

U parameter

6.5

Next Earth close approach

Date

2027-02-10

Nominal distance (from Earth center)

0.15579

23305462

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.4

mag

Diameter

9 - 20*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-08-11

Observatory

ATLAS-MLO, Mauna Loa

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

1.069863

1-sigma variation

0.000062

Unit

Eccentricity (e)

Value

0.320256

1-sigma variation

0.000088

Unit

Inclination (i)

Value

9.5153

1-sigma variation

0.0026

Unit

Long. of Ascending Node (Ω)

Value

317.5747

1-sigma variation

0.0007

Unit

Arg. of Perihelion (ω)

Value

260.5798

1-sigma variation

0.0011

Unit

Mean Anomaly (M)

Value

271.77845

1-sigma variation

0.21852

Unit

Perihelion distance

Value

0.727233

1-sigma variation

Unit

Aphelion distance

Value

1.412492

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.001393

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.074534

1-sigma variation

Unit

MOID

Value

0.000606

1-sigma variation

Unit

Orbit Period

Value

404.1946

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.82426E-9	5.42222E-9	1.62854E-7	4.06366E-8	6.86840E-8	-1.35132E-5
e	5.42222E-9	7.69094E-9	2.31015E-7	5.79110E-8	9.71010E-8	-1.91601E-5
i	1.62854E-7	2.31015E-7	6.93963E-6	1.74212E-6	2.91442E-6	-5.75467E-4
Ω	4.06366E-8	5.79110E-8	1.74212E-6	4.70286E-7	7.02917E-7	-1.43637E-4
ω	6.86840E-8	9.71010E-8	2.91442E-6	7.02917E-7	1.25946E-6	-2.42665E-4
M	-1.35132E-5	-1.91601E-5	-5.75467E-4	-1.43637E-4	-2.42665E-4	4.77498E-2

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

27.394

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

9 - 20*

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

2590

Unit

Source

[1]

Normalized RMS of residuals

Value

0.59518

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-08-11.47154

Unit

Source

[2]

Last Observation

Value

2018-08-14.4261

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

36 (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

Close Approaches for 2018PD20 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	1956-03-09 12:00	43.8	0.1464351	0.1439714	0.0008246
EARTH	1978-08-05 02:43	1383.3	0.0637692	0.0340928	0.0098937
EARTH	1985-03-04 23:26	450.5	0.0838595	0.0780879	0.0027411
EARTH	1989-08-20 02:52	442.0	0.1687421	0.1488630	0.0066266
EARTH	2007-07-04 20:22	> 1 d	0.1925210	0.1867306	0.0019356
EARTH	2014-02-26 09:51	65.0	0.1491808	0.1455446	0.0012171
EARTH	2018-08-10 14:33	< 1 min	0.0002239	0.0002236	0.0000001
EARTH	2027-02-10 11:18	1036.2	0.1557874	0.1417393	0.0047113
EARTH	2037-01-22 21:38	753.4	0.0820586	0.0546626	0.0097293
EARTH	2039-08-18 10:57	612.6	0.1719771	0.1403994	0.0105262
EARTH	2049-08-08 21:06	972.2	0.0352443	0.0009519	0.0151464
EARTH	2058-02-04 21:44	1311.6	0.1235009	0.0991086	0.0083066
EARTH	2068-01-20 16:07	> 1 d	0.1390603	0.0361340	0.0407022
EARTH	2070-08-15 08:57	> 1 d	0.1048811	0.0021965	0.0501280
EARTH	2080-08-02 16:50	> 1 d	0.1610499	0.0071230	0.0758582
EARTH	2089-01-24 09:37	> 1 d	0.0567177	0.0338275	0.0704985
EARTH	2091-08-18 17:09	> 1 d	0.1685354	0.0035263	0.0747534
EARTH	2101-08-01 06:19	1094.8	0.1946777	0.1355446	0.0197701
EARTH	2110-01-21 05:55	> 1 d	0.1412863	0.0487774	0.0335084
EARTH	2112-08-15 02:26	> 1 d	0.0784490	0.0042461	0.0458362
EARTH	2121-02-16 20:48	> 1 w	0.1780056	0.0617473	0.0595980

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
80.49349248	215.90064890	0.00003026	MINIMUM
287.08766618	24.00936834	0.03498670	MINIMUM
4.57771958	121.13898451	0.31415845	SADDLE
182.96071568	298.53827838	0.46288528	SADDLE
3.54560032	299.68339311	1.71368180	SADDLE
181.48795272	117.48185680	2.41178637	MAXIMUM

Download:

MOID Plots

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