Asteroids

2020UA help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.625

Aphelion (Q)

1.093

Eccentricity (e)

0.273

Inclination (i)

1.9

deg

Orbit period (P)

290.8

Earth MOID

0.00006

U parameter

5.7

Next Earth close approach

Date

2039-07-30

Nominal distance (from Earth center)

0.0786

11758776

Maximum Brightness

26.7

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.3

mag

Diameter

6 - 13*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-10-16

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

0.858918

1-sigma variation

0.000011

Unit

Eccentricity (e)

Value

0.272873

1-sigma variation

0.000006

Unit

Inclination (i)

Value

1.9386

1-sigma variation

0.0004

Unit

Long. of Ascending Node (Ω)

Value

27.6819

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

137.6734

1-sigma variation

0.0035

Unit

Mean Anomaly (M)

Value

26.14400

1-sigma variation

0.04444

Unit

Perihelion distance

Value

0.624543

1-sigma variation

Unit

Aphelion distance

Value

1.093294

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.000374

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.344025

1-sigma variation

Unit

MOID

Value

0.000058

1-sigma variation

Unit

Orbit Period

Value

290.7543

1-sigma variation

Unit

U parameter

Value

5.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.20123E-10	6.93554E-11	4.34436E-9	-9.56420E-10	-3.88875E-8	-4.87013E-7
e	6.93554E-11	4.09177E-11	2.52137E-9	-5.51044E-10	-2.25272E-8	-2.80995E-7
i	4.34436E-9	2.52137E-9	1.57422E-7	-3.45539E-8	-1.40754E-6	-1.76104E-5
Ω	-9.56420E-10	-5.51044E-10	-3.45539E-8	7.62023E-9	3.09520E-7	3.87786E-6
ω	-3.88875E-8	-2.25272E-8	-1.40754E-6	3.09520E-7	1.25955E-5	1.57645E-4
M	-4.87013E-7	-2.80995E-7	-1.76104E-5	3.87786E-6	1.57645E-4	1.97453E-3

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

28.347

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

6 - 13*

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

1810

Unit

Source

[1]

Normalized RMS of residuals

Value

0.661817

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-10-16.31568

Unit

Source

[2]

Last Observation

Value

2020-10-20.956328

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

Close Approaches for 2020UA 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	1950-08-02 05:24	258.2	0.1988284	0.1986202	0.0000694
EARTH	1951-09-07 04:29	114.4	0.1756328	0.1755931	0.0000132
EARTH	1951-12-22 10:59	94.5	0.1974003	0.1973055	0.0000316
EARTH	1952-10-20 19:21	4.7	0.0498412	0.0496298	0.0000705
EARTH	1953-10-17 00:35	17.7	0.1267796	0.1261012	0.0002261
EARTH	1981-05-27 10:05	27.1	0.0454235	0.0446377	0.0002636
EARTH	1982-04-30 19:43	185.8	0.1409312	0.1404175	0.0001713
EARTH	1982-06-15 09:46	126.5	0.1330986	0.1326568	0.0001473
EARTH	1983-07-28 04:02	23.2	0.1967696	0.1967135	0.0000187
EARTH	1984-08-29 13:55	77.6	0.1873786	0.1872678	0.0000369
EARTH	1985-10-13 21:09	96.6	0.0968870	0.0961829	0.0002347
EARTH	1986-10-19 15:22	20.4	0.0731199	0.0719546	0.0003884
EARTH	2015-06-01 23:30	9.3	0.1560660	0.1555121	0.0001847
EARTH	2016-05-25 13:26	4.6	0.0344996	0.0342911	0.0000701
VENUS	2017-02-18 03:51	31.1	0.0448416	0.0446896	0.0000508
EARTH	2017-04-06 19:42	101.1	0.1773613	0.1771802	0.0000604
EARTH	2017-07-03 01:37	68.7	0.1641644	0.1640002	0.0000547
EARTH	2018-08-10 23:16	42.6	0.1985197	0.1984740	0.0000152
EARTH	2019-09-18 13:51	21.8	0.1547987	0.1547914	0.0000025
EARTH	2019-12-09 04:34	28.0	0.1749279	0.1749160	0.0000040
EARTH	2020-10-21 01:58	< 1 s	0.0002975	0.0002974	0.0000000
EARTH	2024-10-22 05:23	12.6	0.1124266	0.1108111	0.0005385
VENUS	2025-12-02 21:42	137.2	0.0376029	0.0361183	0.0005064
VENUS	2033-09-10 14:01	245.9	0.0094212	0.0071243	0.0013049
VENUS	2039-04-03 07:36	> 1 d	0.0494348	0.0357228	0.0046117
EARTH	2039-07-30 20:22	1.5	0.0786026	0.0668047	0.0040218
EARTH	2043-08-31 14:44	> 1 d	0.0821040	0.0797889	0.0007743
EARTH	2047-10-21 11:58	243.1	0.0052118	0.0017679	0.0015697
EARTH	2054-08-04 12:26	> 1 w	0.0312815	0.0308281	0.0178292
EARTH	2058-10-22 05:39	> 1 w	0.1392987	0.0029382	0.3074419
EARTH	2065-08-25 18:15	> 1 mo	0.0715434	0.0402583	0.1704691
VENUS	2076-05-17 07:11	> 1 mo	0.0397216	0.0260535	0.3065006
EARTH	2076-10-11 00:23	> 1 mo	0.0449651	0.0040908	0.2031859
VENUS	2081-09-03 00:23	> 1 d	0.0229349	0.0078230	0.0958887
EARTH	2083-08-03 10:12	> 1 d	0.0524379	0.0298938	0.1132714
VENUS	2084-12-29 08:18	> 1 w	0.0276862	0.0265877	0.0572678
EARTH	2087-10-21 14:09	> 1 w	0.1577677	0.0042408	0.4235871
VENUS	2090-04-13 10:19	> 1 mo	0.0468772	0.0075727	0.7572057
EARTH	2094-10-06 05:28	> 1 mo	0.0544181	0.0072330	0.2218647
EARTH	2101-08-06 19:22	> 1 w	0.0297646	0.0297432	0.0047640
EARTH	2112-10-21 07:23	> 1 mo	0.0113372	0.0036689	1.4147585
EARTH	2119-10-21 23:11	> 1 mo	0.0099887	0.0037227	18.7826371
VENUS	2122-04-12 21:43	> 1 mo	0.0072531	0.0070657	27.1503722

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
234.30936693	286.42995646	0.00007631	MINIMUM
131.87044338	206.25230363	0.03387204	MINIMUM
181.39298889	244.99159627	0.08913069	SADDLE
4.56929191	67.82098952	0.36893103	SADDLE
4.86960527	248.19729128	1.63104932	SADDLE
182.79867404	66.05050838	2.08566201	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2020UA

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2070-07-27.817	77319.817	-0.903	0.000	1.12 ± 0.372	2.10E8	4.50E-9	9.20E-3	-10.12
2074-07-22.045	78775.045	-1.466	0.000	1.83 ± 0.241	9.20E5	2.11E-7	9.19E-3	-8.49
2076-10-19.537	79595.537	-1.517	0.678	1.75 ± 15.810	2.62E4	5.65E-7	9.61E-3	-8.06
2076-10-20.152	79596.152	-1.402	0.000	1.59 ± 0.025	2.68E6	1.30E-7	9.23E-3	-8.71
2078-10-19.264	80325.264	-1.390	0.000	1.55 ± 0.043	2.78E6	1.40E-7	9.21E-3	-8.70
2080-10-20.028	81057.028	-1.567	0.000	1.06 ± 0.077	1.94E7	2.35E-8	9.19E-3	-9.49
2082-10-19.917	81786.917	-1.519	0.000	1.86 ± 9.038	4.02E7	1.69E-9	9.23E-3	-10.64
2086-10-19.266	83247.266	-1.516	0.000	1.64 ± 1.960	2.42E8	9.47E-10	9.16E-3	-10.92
2098-10-22.180	87633.180	0.754	4.173	0.36 ± 4.036	4.22E6	1.44E-10	9.58E-3	-11.80
2116-10-20.342	94205.342	-1.419	0.000	1.90 ± 0.003	5.64E6	3.15E-8	9.17E-3	-9.57
2119-10-22.231	95302.231	0.753	1.535	1.53 ± 2.700	4.76E6	1.69E-9	9.64E-3	-10.83


Based on 68 optical observations (of which 0 are rejected as outliers) from 2020/10/16.316 to 2020/10/20.956.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 2.02 and 2.02 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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