Asteroids

2020SW help

Last update: 2024-05-01 14:36 UTC

Orbital Properties

Epoch

60400.0

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

0.00012

U parameter

4.9

Next Earth close approach

Date

2030-03-29

Nominal distance (from Earth center)

0.17775

26590402

Maximum Brightness

32.2

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

4 - 10*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-09-18

Observatory

Mt. Lemmon Survey

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.941324

1-sigma variation

0.000005

Unit

Eccentricity (e)

Value

0.211117

1-sigma variation

0.000008

Unit

Inclination (i)

Value

2.3253

1-sigma variation

0.0006

Unit

Long. of Ascending Node (Ω)

Value

1.8028

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

118.9558

1-sigma variation

0.0017

Unit

Mean Anomaly (M)

Value

208.78666

1-sigma variation

0.00792

Unit

Perihelion distance

Value

0.742594

1-sigma variation

Unit

Aphelion distance

Value

1.140053

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.000558

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.180469

1-sigma variation

Unit

MOID

Value

0.000119

1-sigma variation

Unit

Orbit Period

Value

333.5853

1-sigma variation

Unit

U parameter

Value

4.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.33720E-11	3.61890E-11	-2.78984E-9	5.67818E-10	-8.45106E-9	-3.82545E-8
e	3.61890E-11	5.77582E-11	-4.40290E-9	8.93334E-10	-1.31471E-8	-5.89786E-8
i	-2.78984E-9	-4.40290E-9	3.38515E-7	-6.88416E-8	1.01206E-6	4.55412E-6
Ω	5.67818E-10	8.93334E-10	-6.88416E-8	1.40099E-8	-2.05901E-7	-9.27320E-7
ω	-8.45106E-9	-1.31471E-8	1.01206E-6	-2.05901E-7	3.05807E-6	1.38233E-5
M	-3.82545E-8	-5.89786E-8	4.55412E-6	-9.27320E-7	1.38233E-5	6.26511E-5

Date of computation: 2024-04-23 10:08 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

28.977

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

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 ODIM	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

1315

Unit

Source

[1]

Normalized RMS of residuals

Value

0.674739

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2020SW from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1950-04-01 23:30	> 1 d	0.0314604	0.0111816	0.0275389
EARTH	1977-09-24 17:43	13.6	0.0121726	0.0111545	0.0003395
EARTH	1978-09-02 06:44	63.2	0.1322339	0.1322037	0.0000101
EARTH	1978-11-04 17:35	61.1	0.1306731	0.1306412	0.0000107
EARTH	1979-07-22 10:27	152.4	0.1980644	0.1978244	0.0000800
EARTH	1979-12-24 20:54	520.7	0.1728103	0.1727500	0.0000201
EARTH	1981-02-05 16:54	914.8	0.1489272	0.1479180	0.0003367
EARTH	1981-05-13 13:20	769.6	0.1647071	0.1634906	0.0004055
EARTH	1982-03-31 22:25	121.1	0.0343599	0.0313247	0.0010248
EARTH	1983-04-09 02:03	73.2	0.1118309	0.1083960	0.0011454
EARTH	2019-09-19 02:55	< 1 min	0.1403025	0.1402513	0.0000171
EARTH	2020-09-24 11:11	< 1 s	0.0001877	0.0001876	0.0000000
EARTH	2030-03-29 17:09	506.6	0.1777459	0.1771140	0.0002107
EARTH	2030-07-11 21:36	367.4	0.1269393	0.1267571	0.0000607
VENUS	2037-05-27 05:01	154.0	0.0392465	0.0377737	0.0004923
EARTH	2040-05-24 14:27	12.6	0.0988241	0.0985615	0.0000875
EARTH	2041-09-23 11:35	8.5	0.0243314	0.0239348	0.0001322
EARTH	2051-05-24 07:35	74.3	0.0530305	0.0520129	0.0003420
EARTH	2052-09-22 18:49	27.3	0.0934676	0.0916893	0.0005928
EARTH	2062-07-28 10:42	482.8	0.1288120	0.1286526	0.0000532
EARTH	2062-11-29 01:15	753.5	0.1960747	0.1953047	0.0002567
VENUS	2069-05-30 00:37	201.4	0.0253540	0.0253237	0.0000173
EARTH	2072-05-24 11:60	65.9	0.1160258	0.1108722	0.0017219
EARTH	2073-09-17 20:28	881.3	0.0596246	0.0530493	0.0021921
EARTH	2083-05-22 10:60	28.8	0.0376714	0.0357730	0.0008624
EARTH	2084-09-24 23:27	70.5	0.0222450	0.0123159	0.0033167
EARTH	2094-07-30 23:06	> 1 w	0.1273794	0.1191031	0.0029237
EARTH	2094-11-28 07:58	> 1 w	0.1939617	0.1556497	0.0127767
VENUS	2101-05-29 07:25	> 1 w	0.0263212	0.0226307	0.0180027
EARTH	2104-05-24 16:14	> 1 d	0.0556722	0.0356238	0.1175564
EARTH	2105-09-26 23:15	> 1 d	0.0030362	0.0025298	0.1007331
VENUS	2114-04-25 23:04	> 1 mo	0.0338686	0.0336947	2.1207912
EARTH	2117-03-18 11:07	> 1 mo	0.1866228	0.0758874	32.9500003
EARTH	2117-07-14 13:52	> 1 mo	0.1346015	0.0973573	7.6622432
EARTH	2118-09-24 04:18	> 1 mo	0.1506067	0.0031627	97.6334533

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