Asteroids

2020CW help

Last update: 2026-07-30 14:25 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.424

Aphelion (Q)

1.739

Eccentricity (e)

0.608

Inclination (i)

5.9

deg

Orbit period (P)

410.8

Earth MOID

0.00010

U parameter

8.2

Next Earth close approach

Date

2029-01-31

Nominal distance (from Earth center)

0.00144

215425

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

32.4

mag

Diameter

0.9 - 2.0*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-02-01

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

1.081566

1-sigma variation

0.000743

Unit

Eccentricity (e)

Value

0.607624

1-sigma variation

0.000368

Unit

Inclination (i)

Value

5.9369

1-sigma variation

0.0028

Unit

Long. of Ascending Node (Ω)

Value

131.7899

1-sigma variation

0.0063

Unit

Arg. of Perihelion (ω)

Value

120.4627

1-sigma variation

0.0093

Unit

Mean Anomaly (M)

Value

184.92550

1-sigma variation

2.07352

Unit

Perihelion distance

Value

0.424380

1-sigma variation

Unit

Aphelion distance

Value

1.738751

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.000758

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.493373

1-sigma variation

Unit

MOID

Value

0.000101

1-sigma variation

Unit

Orbit Period

Value

410.8447

1-sigma variation

Unit

U parameter

Value

8.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.51964E-7	2.73236E-7	-2.05124E-6	-4.68416E-6	-6.81400E-6	-1.54050E-3
e	2.73236E-7	1.35449E-7	-1.00748E-6	-2.31866E-6	-3.35614E-6	-7.62581E-4
i	-2.05124E-6	-1.00748E-6	7.95731E-6	1.74125E-5	2.60268E-5	5.72521E-3
Ω	-4.68416E-6	-2.31866E-6	1.74125E-5	3.97516E-5	5.78364E-5	1.30733E-2
ω	-6.81400E-6	-3.35614E-6	2.60268E-5	5.78364E-5	8.56239E-5	1.90182E-2
M	-1.54050E-3	-7.62581E-4	5.72521E-3	1.30733E-2	1.90182E-2	4.29947E0

Date of computation: 2026-07-30 14:25 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

32.397

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

0.9 - 2.0*

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

0.1

Unit

Source

[1]

Unobserved

Value

2417

Unit

Source

[1]

Normalized RMS of residuals

Value

0.638537

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-02-01.328881

Unit

Source

[2]

Last Observation

Value

2020-02-01.463919

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

13 (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

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 2020CW 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	1951-09-09 18:09	> 1 mo	0.1732875	0.0249452	19.0758241
EARTH	1961-01-31 04:24	> 1 d	0.0038439	0.0006641	0.1549819
EARTH	1972-01-27 10:25	> 1 w	0.1119306	0.0009656	0.4240221
EARTH	1973-09-22 08:27	> 1 w	0.1151752	0.0250753	0.4229128
EARTH	1984-09-16 20:55	> 1 w	0.0274867	0.0249810	0.0814240
EARTH	1995-09-11 05:10	> 1 w	0.1712748	0.0255592	0.2260868
MERCURY	2002-05-22 16:18	> 1 w	0.0328467	0.0313618	0.0381919
EARTH	2009-02-06 19:14	> 1 d	0.1532702	0.0001777	0.0699513
VENUS	2010-09-16 09:46	> 1 d	0.0340775	0.0336626	0.0091720
EARTH	2020-02-01 12:49	< 1 s	0.0001049	0.0001046	0.0000001
EARTH	2023-10-05 05:41	1019.7	0.0991595	0.0905714	0.0086251
EARTH	2029-01-31 18:45	> 1 d	0.0014400	0.0001511	0.0576413
MERCURY	2030-04-25 17:47	> 1 mo	0.0390498	0.0365655	2.2233493
EARTH	2033-10-14 03:52	> 1 mo	0.1714140	0.0928066	17.3557064
VENUS	2036-11-13 02:52	> 1 mo	0.0198388	0.0100072	35.5727270
EARTH	2040-02-05 13:35	> 1 mo	0.1488152	0.0027973	18.8481813
EARTH	2065-10-04 13:32	> 1 mo	0.1572168	0.0922725	52.6572523
MERCURY	2066-09-05 19:01	> 1 mo	0.0373927	0.0370563	11.8969764
EARTH	2072-01-27 04:05	> 1 mo	0.1503065	0.0008616	65.5088077
MERCURY	2074-05-23 23:24	> 1 mo	0.0432708	0.0366610	40.3763910
EARTH	2076-10-07 03:55	> 1 mo	0.1002630	0.0926948	22.9848244
VENUS	2077-10-21 07:37	> 1 mo	0.0059639	0.0045406	46.9779095
EARTH	2083-02-02 18:39	> 1 mo	0.0285004	0.0023091	300.7740674
VENUS	2095-04-26 00:21	> 1 mo	0.0137120	0.0095259	10.4125351
EARTH	2097-10-07 08:07	> 1 mo	0.0999645	0.0898881	39.2575138
VENUS	2100-11-07 16:23	> 1 mo	0.0096972	0.0088771	87.2041879
EARTH	2104-02-06 08:35	> 1 mo	0.1076658	0.0017296	1045.5386553
EARTH	2118-10-10 02:35	> 1 mo	0.0934445	0.0933935	55.5253522
EARTH	2125-02-05 13:10	> 1 mo	0.1011569	0.0022065	4171.6388898

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
278.41979019	26.99705022	0.00010093	MINIMUM
82.03878381	269.49869983	0.09086135	MINIMUM
0.93952162	148.70195857	0.59278625	SADDLE
179.91117917	328.22838146	0.76177244	SADDLE
1.22715215	329.34029886	1.40913102	SADDLE
180.51097088	148.53117193	2.75052375	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2020CW

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2046-02-01.124	68377.124	4.046	0.44 ± 0.016	1.73E4	1.37E-8	9.78E-5	-10.88
2048-02-01.473	69107.473	-3.747	1.14 ± 0.004	2.72E4	8.84E-9	9.52E-5	-11.11
2057-01-31.567	72394.567	-1.852	0.89 ± 0.051	8.67E4	1.33E-6	9.55E-5	-9.07


Based on 13 optical observations (of which 1 are rejected as outliers) from 2020/02/01.329 to 2020/02/01.464.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.14 and 1.14 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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