Asteroids

2020OY4 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.625

Aphelion (Q)

1.414

Eccentricity (e)

0.387

Inclination (i)

3.6

deg

Orbit period (P)

376.1

Earth MOID

0.00015

U parameter

6.4

Next Earth close approach

Date

2028-03-05

Nominal distance (from Earth center)

0.16827

25173121

Maximum Brightness

28.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

2.6 - 6*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-07-26

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

1.019648

1-sigma variation

0.000047

Unit

Eccentricity (e)

Value

0.387227

1-sigma variation

0.000034

Unit

Inclination (i)

Value

3.5945

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

305.3558

1-sigma variation

2.722E-5

Unit

Arg. of Perihelion (ω)

Value

112.1391

1-sigma variation

0.0043

Unit

Mean Anomaly (M)

Value

183.25556

1-sigma variation

0.13566

Unit

Perihelion distance

Value

0.624813

1-sigma variation

Unit

Aphelion distance

Value

1.414484

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.000989

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.228116

1-sigma variation

Unit

MOID

Value

0.000148

1-sigma variation

Unit

Orbit Period

Value

376.0746

1-sigma variation

Unit

U parameter

Value

6.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.20333E-9	1.58974E-9	-2.38922E-9	1.25859E-9	-2.01687E-7	-6.36787E-6
e	1.58974E-9	1.15012E-9	-1.67310E-9	9.00540E-10	-1.45315E-7	-4.59432E-6
i	-2.38922E-9	-1.67310E-9	3.54921E-9	-1.48833E-9	2.22060E-7	6.90813E-6
Ω	1.25859E-9	9.00540E-10	-1.48833E-9	7.41174E-10	-1.15709E-7	-3.63790E-6
ω	-2.01687E-7	-1.45315E-7	2.22060E-7	-1.15709E-7	1.84754E-5	5.82909E-4
M	-6.36787E-6	-4.59432E-6	6.90813E-6	-3.63790E-6	5.82909E-4	1.84038E-2

Date of computation: 2026-06-04 23:11 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

30.041

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

2.6 - 6*

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

Unit

Source

[1]

Unobserved

Value

2140

Unit

Source

[1]

Normalized RMS of residuals

Value

0.535107

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-07-26.34008

Unit

Source

[2]

Last Observation

Value

2020-07-28.103613

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

68 (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

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 2020OY4 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	1951-08-16 10:41	> 1 w	0.1818332	0.0099357	0.0886486
EARTH	1953-02-16 09:18	> 1 d	0.1783456	0.0071601	0.0878279
VENUS	1968-06-07 09:43	> 1 w	0.0398792	0.0107806	0.0599968
EARTH	1970-08-04 11:50	> 1 d	0.1245375	0.0019780	0.0830501
EARTH	1972-02-14 04:31	> 1 d	0.1133282	0.0086675	0.0816690
VENUS	1985-01-20 10:04	> 1 w	0.0273621	0.0148837	0.0244152
EARTH	1989-07-28 13:11	337.4	0.0133220	0.0022126	0.0037532
EARTH	1991-02-09 07:45	415.4	0.0285367	0.0126178	0.0056526
VENUS	2002-12-01 12:50	706.6	0.0400808	0.0264755	0.0047874
EARTH	2020-07-28 05:29	< 1 s	0.0002774	0.0002773	0.0000000
EARTH	2021-07-26 15:25	63.6	0.1758961	0.1746165	0.0004265
EARTH	2028-03-05 01:00	341.3	0.1682719	0.1593488	0.0029788
EARTH	2029-03-07 03:08	185.5	0.0450965	0.0415906	0.0015434
EARTH	2054-07-23 22:58	949.6	0.1287667	0.0781817	0.0168617
EARTH	2055-07-30 13:59	624.9	0.0469613	0.0005605	0.0172985
VENUS	2062-01-09 17:38	432.6	0.0308652	0.0236869	0.0025918
EARTH	2063-03-03 23:00	84.5	0.1073374	0.1047039	0.0008787
EARTH	2064-03-09 18:50	146.6	0.0995655	0.0885176	0.0037344
EARTH	2088-07-27 14:41	> 1 d	0.0288660	0.0009613	0.0643098
EARTH	2089-07-29 23:01	> 1 d	0.1463571	0.0251142	0.0404395
EARTH	2097-03-05 16:48	> 1 d	0.0523008	0.0409681	0.0794369
EARTH	2098-03-13 00:40	> 1 d	0.1506890	0.0419525	0.1456488
VENUS	2103-03-28 17:19	> 1 w	0.0199561	0.0187600	0.0912778
EARTH	2123-07-25 20:01	> 1 mo	0.1194595	0.0010432	1.5537120
EARTH	2124-07-31 07:47	> 1 mo	0.0579311	0.0012848	1.5551415

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
270.44852596	204.23785357	0.00029200	MINIMUM
85.32289375	63.65150997	0.04076294	MINIMUM
356.80646504	312.59187816	0.36679958	SADDLE
178.35562813	134.64628988	0.40748023	SADDLE
357.10377791	133.05836642	1.63709167	SADDLE
178.90814819	315.02956333	2.40198109	MAXIMUM

Download:

MOID Plots

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