Asteroids

2020OB help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.486

Aphelion (Q)

2.787

Eccentricity (e)

0.703

Inclination (i)

25.7

deg

Orbit period (P)

764.4

Earth MOID

0.01173

U parameter

9.0

Next Earth close approach

Date

2043-07-25

Nominal distance (from Earth center)

0.05567

8327730

Maximum Brightness

20.3

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

23.6

mag

Diameter

50 - 110*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-07-16

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

1.636100

1-sigma variation

0.011530

Unit

Eccentricity (e)

Value

0.703237

1-sigma variation

0.002443

Unit

Inclination (i)

Value

25.7050

1-sigma variation

0.0939

Unit

Long. of Ascending Node (Ω)

Value

120.8592

1-sigma variation

0.0087

Unit

Arg. of Perihelion (ω)

Value

283.6282

1-sigma variation

0.0748

Unit

Mean Anomaly (M)

Value

269.63733

1-sigma variation

10.49870

Unit

Perihelion distance

Value

0.485535

1-sigma variation

Unit

Aphelion distance

Value

2.786666

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.274757

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.024871

1-sigma variation

Unit

MOID

Value

0.011735

1-sigma variation

Unit

Orbit Period

Value

764.3871

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.32931E-4	2.81663E-5	1.08258E-3	9.98584E-5	-8.62147E-4	-1.21045E-1
e	2.81663E-5	5.96809E-6	2.29387E-4	2.11586E-5	-1.82675E-4	-2.56479E-2
i	1.08258E-3	2.29387E-4	8.81672E-3	8.13233E-4	-7.02103E-3	-9.85786E-1
Ω	9.98584E-5	2.11586E-5	8.13233E-4	7.50153E-5	-6.47665E-4	-9.09298E-2
ω	-8.62147E-4	-1.82675E-4	-7.02103E-3	-6.47665E-4	5.59203E-3	7.85060E-1
M	-1.21045E-1	-2.56479E-2	-9.85786E-1	-9.09298E-2	7.85060E-1	1.10222E2

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

23.586

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

50 - 110*

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

2220

Unit

Source

[1]

Normalized RMS of residuals

Value

0.653707

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-07-14.477491

Unit

Source

[2]

Last Observation

Value

2020-07-19.417372

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

29 (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

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 2020OB 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	1953-07-26 22:11	> 1 mo	0.0943640	0.0221519	1.4534616
EARTH	1960-02-03 14:32	> 1 mo	0.1788066	0.1626258	0.7758124
EARTH	1976-07-29 23:31	> 1 mo	0.1615105	0.0221395	2.1559931
EARTH	1983-02-09 09:03	> 1 mo	0.1636962	0.1628974	0.1981412
EARTH	2020-07-20 02:29	< 1 min	0.0484940	0.0479638	0.0001767
EARTH	2043-07-25 15:26	> 1 mo	0.0556674	0.0094263	1.4049458
EARTH	2050-02-02 20:45	> 1 mo	0.1843708	0.1702301	0.4860097
EARTH	2073-02-11 18:30	> 1 w	0.1838856	0.1702905	0.1238715
EARTH	2110-07-15 04:20	> 1 mo	0.1858242	0.0057287	1.0251370

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
302.92415361	195.48850167	0.01173491	MINIMUM
49.91129273	33.87385270	0.16602624	MINIMUM
355.62166631	291.96541561	0.59252175	SADDLE
356.96937281	115.50285467	1.46171227	SADDLE
178.31952008	120.42019637	1.92006607	SADDLE
180.44257164	301.40094966	3.70935508	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2020OB

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2114-07-23.839	93385.839	1.839	1.01 ± 0.004	1.41E6	9.31E-8	3.14E1	-6.26
2116-07-23.401	94116.401	-0.403	0.50 ± 0.003	8.40E4	9.56E-6	2.89E1	-4.29
2116-07-23.402	94116.402	-0.403	0.70 ± 0.021	8.78E4	9.02E-6	2.89E1	-4.31
2121-07-23.664	95942.664	-1.464	0.94 ± 0.010	8.86E5	1.74E-7	2.78E1	-6.06


Based on 29 optical observations (of which 1 are rejected as outliers) from 2020/07/14.477 to 2020/07/19.417.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.09 and 1.09 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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