Asteroids

2020AD1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.901

Aphelion (Q)

1.205

Eccentricity (e)

0.144

Inclination (i)

3.6

deg

Orbit period (P)

394.7

Earth MOID

0.00498

U parameter

1.8

Next Earth close approach

Date

2033-12-07

Nominal distance (from Earth center)

0.16234

24285579

Maximum Brightness

23.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.1

mag

Diameter

16 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-01-04

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

1.053099

1-sigma variation

6.245E-8

Unit

Eccentricity (e)

Value

0.144386

1-sigma variation

4.949E-7

Unit

Inclination (i)

Value

3.6460

1-sigma variation

8.311E-6

Unit

Long. of Ascending Node (Ω)

Value

98.1946

1-sigma variation

1.974E-5

Unit

Arg. of Perihelion (ω)

Value

99.8567

1-sigma variation

1.934E-5

Unit

Mean Anomaly (M)

Value

87.48933

1-sigma variation

0.00017

Unit

Perihelion distance

Value

0.901046

1-sigma variation

Unit

Aphelion distance

Value

1.205153

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.073837

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.011978

1-sigma variation

Unit

MOID

Value

0.004980

1-sigma variation

Unit

Orbit Period

Value

394.7322

1-sigma variation

Unit

U parameter

Value

1.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.89995E-15	2.68100E-14	1.05883E-14	1.59831E-13	-8.26072E-13	-1.04805E-11
e	2.68100E-14	2.44968E-13	2.44132E-13	-1.19393E-12	-6.19725E-12	-7.63264E-11
i	1.05883E-14	2.44132E-13	6.90645E-11	1.25125E-10	-1.02392E-10	-7.33513E-11
Ω	1.59831E-13	-1.19393E-12	1.25125E-10	3.89527E-10	-2.25745E-10	-3.57723E-10
ω	-8.26072E-13	-6.19725E-12	-1.02392E-10	-2.25745E-10	3.74201E-10	2.28745E-9
M	-1.04805E-11	-7.63264E-11	-7.33513E-11	-3.57723E-10	2.28745E-9	2.85201E-8

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

26.137

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

16 - 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 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

566

Unit

Source

[1]

Unobserved

Value

1558

Unit

Source

[1]

Normalized RMS of residuals

Value

0.542287

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2019-12-28.540275

Unit

Source

[2]

Last Observation

Value

2021-07-16.84554

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

57 (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 2020AD1 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	1956-01-16 21:49	4.9	0.0956723	0.0955638	0.0000362
EARTH	1957-06-29 03:48	24.1	0.0395076	0.0392072	0.0001001
EARTH	1972-01-02 18:38	173.3	0.1044624	0.1039393	0.0001745
EARTH	1972-02-28 00:50	276.9	0.1020478	0.1017036	0.0001147
EARTH	1972-09-19 04:26	211.6	0.1983753	0.1982558	0.0000398
EARTH	1973-07-12 01:38	11.2	0.1347110	0.1341217	0.0001964
EARTH	1987-01-16 22:29	1.5	0.0615451	0.0615392	0.0000020
EARTH	1988-06-30 13:30	4.2	0.0304832	0.0304206	0.0000209
EARTH	2003-12-03 22:44	22.7	0.1530770	0.1530460	0.0000103
EARTH	2004-04-04 17:16	30.6	0.1232354	0.1232329	0.0000008
EARTH	2004-09-03 17:48	25.4	0.1788604	0.1788360	0.0000082
EARTH	2005-07-14 06:41	1.1	0.1737064	0.1736397	0.0000223
EARTH	2020-01-17 21:14	< 1 min	0.0233318	0.0233317	0.0000000
EARTH	2021-07-04 07:56	< 1 min	0.0071368	0.0071367	0.0000000
EARTH	2033-12-07 03:10	8.6	0.1623391	0.1623263	0.0000043
EARTH	2034-04-18 06:14	10.2	0.1163525	0.1163517	0.0000003
EARTH	2034-08-23 03:40	8.9	0.1692563	0.1692467	0.0000032
EARTH	2047-01-22 16:46	< 1 min	0.0309993	0.0309845	0.0000050
EARTH	2048-07-10 07:12	< 1 min	0.0829561	0.0829142	0.0000140
EARTH	2060-12-15 23:12	44.6	0.1453628	0.1452896	0.0000244
EARTH	2061-04-04 09:02	55.6	0.1160879	0.1160751	0.0000043
EARTH	2061-09-03 02:46	47.3	0.1839328	0.1838888	0.0000147
EARTH	2074-01-18 05:24	1.8	0.1296227	0.1294863	0.0000455
EARTH	2075-07-02 17:12	7.8	0.0194593	0.0193476	0.0000372
EARTH	2088-12-22 21:30	745.8	0.1263320	0.1248430	0.0004971
EARTH	2089-03-18 01:18	1032.4	0.1116751	0.1110418	0.0002111
EARTH	2089-09-12 19:09	770.3	0.1947243	0.1941414	0.0001943
EARTH	2090-07-16 00:33	39.8	0.1931419	0.1908386	0.0007678
EARTH	2103-01-19 21:04	53.0	0.0652798	0.0627378	0.0008507
EARTH	2104-07-04 22:32	120.0	0.0076037	0.0068409	0.0003369
EARTH	2119-01-18 19:21	> 1 d	0.0237801	0.0220063	0.0267436
EARTH	2120-07-01 09:02	> 1 w	0.0390802	0.0086081	0.1318768

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
75.31617081	179.28488046	0.00422293	MINIMUM
292.46024687	20.01022692	0.02808382	MINIMUM
3.54473243	98.90272759	0.11696067	SADDLE
183.48813136	279.61363703	0.21850232	SADDLE
6.70090193	282.57661528	1.89737317	SADDLE
185.43160370	101.29860333	2.20638696	MAXIMUM

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MOID Plots

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