Asteroids

2020UO4 help

Last update: 2025-04-09 07:59 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Aten

Perihelion (q)

0.884

Aphelion (Q)

1.063

Eccentricity (e)

0.092

Inclination (i)

1.5

deg

Orbit period (P)

350.9

Earth MOID

0.00269

U parameter

1.7

Next Earth close approach

Date

2044-10-19

Nominal distance (from Earth center)

0.12069

18054369

Maximum Brightness

27.1

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

28.5

mag

Diameter

5 - 12*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-10-23

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.973662

1-sigma variation

4.604E-8

Unit

Eccentricity (e)

Value

0.091621

1-sigma variation

1.750E-7

Unit

Inclination (i)

Value

1.4639

1-sigma variation

1.584E-6

Unit

Long. of Ascending Node (Ω)

Value

210.4499

1-sigma variation

8.541E-6

Unit

Arg. of Perihelion (ω)

Value

64.0687

1-sigma variation

9.249E-6

Unit

Mean Anomaly (M)

Value

3.65569

1-sigma variation

0.00010

Unit

Perihelion distance

Value

0.884454

1-sigma variation

Unit

Aphelion distance

Value

1.062870

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.076635

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.011267

1-sigma variation

Unit

MOID

Value

0.002687

1-sigma variation

Unit

Orbit Period

Value

350.9222

1-sigma variation

Unit

U parameter

Value

1.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.11957E-15	-8.05451E-15	-6.51499E-14	-2.26738E-13	1.94394E-13	-4.68889E-12
e	-8.05451E-15	3.06156E-14	2.47817E-13	8.62988E-13	-7.35732E-13	1.78117E-11
i	-6.51499E-14	2.47817E-13	2.50749E-12	6.08404E-12	-4.05810E-12	1.42721E-10
Ω	-2.26738E-13	8.62988E-13	6.08404E-12	7.29457E-11	-7.23279E-11	5.04679E-10
ω	1.94394E-13	-7.35732E-13	-4.05810E-12	-7.23279E-11	8.55506E-11	-4.49247E-10
M	-4.68889E-12	1.78117E-11	1.42721E-10	5.04679E-10	-4.49247E-10	1.03925E-8

Date of computation: 2025-04-09 07:59 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

28.519

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

5 - 12*

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

494

Unit

Source

[1]

Unobserved

Value

1224

Unit

Source

[1]

Normalized RMS of residuals

Value

0.648757

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-10-19.453039

Unit

Source

[2]

Last Observation

Value

2022-02-25.075563

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

82 (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

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 2020UO4 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	1956-10-28 08:42	9.8	0.1840422	0.1824343	0.0005360
EARTH	1957-10-23 13:34	4.6	0.0121404	0.0118605	0.0000933
EARTH	1958-09-24 10:29	166.6	0.0731143	0.0729264	0.0000626
EARTH	1958-11-19 06:44	119.4	0.0671652	0.0670043	0.0000536
EARTH	1959-08-06 11:23	118.4	0.1114390	0.1114078	0.0000104
EARTH	1960-01-01 08:14	73.8	0.0970663	0.0970422	0.0000080
EARTH	1960-07-01 14:53	74.7	0.1170351	0.1170190	0.0000054
EARTH	1961-02-06 20:58	34.2	0.0881536	0.0881393	0.0000048
EARTH	1961-05-24 20:34	36.4	0.0961512	0.0961237	0.0000091
EARTH	1962-03-29 21:03	< 1 min	0.0274357	0.0274157	0.0000067
EARTH	1963-03-28 10:44	1.2	0.0401884	0.0401053	0.0000277
EARTH	1964-03-24 06:52	1.1	0.1293095	0.1292179	0.0000305
EARTH	2018-10-26 16:36	< 1 min	0.1762077	0.1762028	0.0000016
EARTH	2019-10-23 09:29	< 1 min	0.0810443	0.0810416	0.0000009
EARTH	2020-10-20 06:04	< 1 s	0.0042676	0.0042676	0.0000000
EARTH	2021-07-05 07:35	< 1 min	0.1344772	0.1344766	0.0000002
EARTH	2022-02-28 20:20	< 1 s	0.0473119	0.0473118	0.0000000
EARTH	2023-03-04 07:13	< 1 min	0.1978739	0.1978727	0.0000004
EARTH	2044-10-19 14:31	< 1 min	0.1206860	0.1206542	0.0000106
EARTH	2045-08-23 11:50	20.1	0.1037549	0.1037407	0.0000047
EARTH	2045-12-10 04:54	15.2	0.0789226	0.0789154	0.0000024
EARTH	2046-05-30 11:17	15.2	0.1243576	0.1243519	0.0000019
EARTH	2047-03-08 22:13	< 1 min	0.0546821	0.0546585	0.0000079
EARTH	2068-10-20 23:15	20.1	0.0216416	0.0214250	0.0000722
EARTH	2069-06-18 06:18	56.3	0.1382026	0.1381592	0.0000145
EARTH	2070-03-04 23:06	21.3	0.0292533	0.0290136	0.0000801
EARTH	2087-11-27 02:08	> 1 d	0.0646348	0.0631138	0.0005075
EARTH	2088-05-23 16:05	> 1 d	0.1305910	0.1297336	0.0002863
EARTH	2089-02-28 16:30	34.5	0.1309752	0.1277282	0.0010826
EARTH	2105-10-22 18:52	367.4	0.0122106	0.0066745	0.0018456
EARTH	2106-05-30 22:33	> 1 d	0.1447368	0.1429047	0.0006262
EARTH	2107-02-22 13:01	1387.0	0.1473460	0.1134934	0.0113124
EARTH	2120-10-20 13:52	> 1 d	0.0061207	0.0000960	0.1492382
EARTH	2121-07-17 02:02	> 1 mo	0.1298324	0.0316565	0.7179654
EARTH	2122-02-01 03:40	> 1 mo	0.0736002	0.0162451	2.1403888
EARTH	2122-04-21 18:12	> 1 mo	0.0859859	0.0428600	3.1447087
EARTH	2123-03-10 06:25	> 1 mo	0.1363567	0.0135204	8.5063495

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
104.74119864	283.34317199	0.00286036	MINIMUM
259.66750590	66.27266375	0.01703444	MINIMUM
182.64770517	355.11040643	0.08358567	SADDLE
2.22182910	174.95523809	0.13389988	SADDLE
1.32148519	353.95263015	1.86713395	SADDLE
181.04159568	173.67108041	2.07933713	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2020UO4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2118-10-20.651	94935.651	-3.145	1.61 ± 0.000	9.16E3	2.00E-6	1.10E-8	-7.95
2119-10-21.225	95301.225	-1.846	2.21 ± 0.000	6.01E3	6.92E-5	3.83E-7	-6.41
2120-10-20.560	95666.560	0.109	2.85 ± 0.000	3.55E3	4.98E-4	2.75E-6	-5.56


Based on 82 optical observations (of which 1 are rejected as outliers) from 2020/10/19.453 to 2022/02/25.076.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 3.62 and 3.62 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250305 091647.715 UTC.

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