Asteroids

2020SW help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.743

Aphelion (Q)

1.140

Eccentricity (e)

0.211

Inclination (i)

2.3

deg

Orbit period (P)

333.6

Earth MOID

0.00033

U parameter

4.9

Next Earth close approach

Date

2030-03-29

Nominal distance (from Earth center)

0.17774

26589409

Maximum Brightness

32.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

4 - 10*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-09-18

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

0.941353

1-sigma variation

0.000005

Unit

Eccentricity (e)

Value

0.211168

1-sigma variation

0.000008

Unit

Inclination (i)

Value

2.3252

1-sigma variation

0.0006

Unit

Long. of Ascending Node (Ω)

Value

1.7950

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

118.9606

1-sigma variation

0.0017

Unit

Mean Anomaly (M)

Value

352.11060

1-sigma variation

0.01456

Unit

Perihelion distance

Value

0.742570

1-sigma variation

Unit

Aphelion distance

Value

1.140137

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.001550

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.180444

1-sigma variation

Unit

MOID

Value

0.000326

1-sigma variation

Unit

Orbit Period

Value

333.6010

1-sigma variation

Unit

U parameter

Value

4.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.32069E-11	3.59876E-11	-2.77967E-9	5.64729E-10	-8.39159E-9	-7.01572E-8
e	3.59876E-11	5.75313E-11	-4.39367E-9	8.89912E-10	-1.30745E-8	-1.08541E-7
i	-2.77967E-9	-4.39367E-9	3.38444E-7	-6.87076E-8	1.00840E-6	8.39109E-6
Ω	5.64729E-10	8.89912E-10	-6.87076E-8	1.39582E-8	-2.04791E-7	-1.70518E-6
ω	-8.39159E-9	-1.30745E-8	1.00840E-6	-2.04791E-7	3.03665E-6	2.53598E-5
M	-7.01572E-8	-1.08541E-7	8.39109E-6	-1.70518E-6	2.53598E-5	2.12131E-4

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

28.963

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

4 - 10*

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

2124

Unit

Source

[1]

Normalized RMS of residuals

Value

0.676661

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-09-18.31827

Unit

Source

[2]

Last Observation

Value

2020-09-24.22909

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

229 (2)

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 2020SW 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	1950-04-01 22:17	> 1 d	0.0306385	0.0111727	0.0274428
EARTH	1977-09-24 17:42	13.6	0.0121625	0.0111457	0.0003390
EARTH	1978-09-02 06:43	62.9	0.1322344	0.1322049	0.0000099
EARTH	1978-11-04 17:34	61.4	0.1306736	0.1306423	0.0000105
EARTH	1979-07-22 10:28	152.6	0.1980622	0.1978220	0.0000801
EARTH	1979-12-24 20:48	520.9	0.1728110	0.1727507	0.0000201
EARTH	1981-02-05 16:43	914.9	0.1489369	0.1479278	0.0003367
EARTH	1981-05-13 13:30	769.6	0.1647188	0.1635023	0.0004055
EARTH	1982-03-31 22:21	121.2	0.0343895	0.0313534	0.0010250
EARTH	1983-04-09 02:00	73.2	0.1117979	0.1083629	0.0011454
EARTH	2019-09-19 02:55	< 1 min	0.1403030	0.1402518	0.0000171
EARTH	2020-09-24 11:11	< 1 s	0.0001877	0.0001876	0.0000000
EARTH	2030-03-29 17:15	506.6	0.1777392	0.1771073	0.0002108
EARTH	2030-07-11 21:30	367.4	0.1269374	0.1267551	0.0000608
VENUS	2037-05-27 05:06	154.1	0.0392309	0.0377582	0.0004922
EARTH	2040-05-24 14:27	12.6	0.0988268	0.0985634	0.0000878
EARTH	2041-09-23 11:35	8.5	0.0243272	0.0239319	0.0001318
EARTH	2051-05-24 07:38	74.7	0.0530417	0.0520197	0.0003435
EARTH	2052-09-22 18:48	27.4	0.0934868	0.0917018	0.0005950
EARTH	2062-07-28 10:50	485.4	0.1288103	0.1286501	0.0000534
EARTH	2062-11-29 01:08	757.2	0.1960664	0.1952926	0.0002579
VENUS	2069-05-30 00:32	202.4	0.0253534	0.0253237	0.0000172
EARTH	2072-05-24 11:57	66.2	0.1159692	0.1107854	0.0017321
EARTH	2073-09-17 20:57	884.5	0.0595527	0.0529366	0.0022057
EARTH	2083-05-22 10:59	28.7	0.0376432	0.0357570	0.0008601
EARTH	2084-09-24 23:24	71.5	0.0223538	0.0123815	0.0033311
EARTH	2094-07-30 16:07	> 1 w	0.1274727	0.1196089	0.0027830
EARTH	2094-11-28 14:20	> 1 w	0.1943766	0.1566304	0.0125876
VENUS	2101-05-29 16:17	> 1 w	0.0269510	0.0219598	0.0204657
EARTH	2104-05-24 17:26	> 1 d	0.0593845	0.0355902	0.1089830
EARTH	2105-09-26 19:37	> 1 d	0.0077139	0.0025767	0.1507220
EARTH	2116-05-20 16:14	> 1 d	0.0344933	0.0333243	2.5406166
EARTH	2117-09-24 16:29	> 1 mo	0.0381177	0.0038878	13.7899560

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
251.78222799	260.99893187	0.00033228	MINIMUM
110.08923636	139.93048660	0.03592504	MINIMUM
179.83755173	199.63252938	0.12878573	SADDLE
1.37780328	20.70912864	0.24384252	SADDLE
2.21202562	201.70573408	1.75938973	SADDLE
181.50876973	20.99132038	2.12437378	MAXIMUM

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MOID Plots

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