Asteroids

2021WJ3 help

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

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.994

Aphelion (Q)

1.646

Eccentricity (e)

0.247

Inclination (i)

7.6

deg

Orbit period (P)

554.1

Earth MOID

0.02391

U parameter

6.9

Next Earth close approach

Date

2065-12-13

Nominal distance (from Earth center)

0.02433

3640006

Maximum Brightness

19.2

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.1

mag

Diameter

16 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-11-28

Observatory

Pan-STARRS 1, Haleakala

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

1.320216

1-sigma variation

0.000207

Unit

Eccentricity (e)

Value

0.246907

1-sigma variation

0.000114

Unit

Inclination (i)

Value

7.6151

1-sigma variation

0.0034

Unit

Long. of Ascending Node (Ω)

Value

76.7431

1-sigma variation

0.0016

Unit

Arg. of Perihelion (ω)

Value

24.4645

1-sigma variation

0.0026

Unit

Mean Anomaly (M)

Value

73.86718

1-sigma variation

0.20135

Unit

Perihelion distance

Value

0.994245

1-sigma variation

Unit

Aphelion distance

Value

1.646187

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.027105

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.584336

1-sigma variation

Unit

MOID

Value

0.023913

1-sigma variation

Unit

Orbit Period

Value

554.0717

1-sigma variation

Unit

U parameter

Value

6.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.27031E-8	2.36418E-8	7.00776E-7	3.32666E-7	-5.43225E-7	-4.16081E-5
e	2.36418E-8	1.30889E-8	3.87972E-7	1.84175E-7	-3.00743E-7	-2.30356E-5
i	7.00776E-7	3.87972E-7	1.15001E-5	5.45917E-6	-8.91432E-6	-6.82806E-4
Ω	3.32666E-7	1.84175E-7	5.45917E-6	2.59161E-6	-4.23173E-6	-3.24136E-4
ω	-5.43225E-7	-3.00743E-7	-8.91432E-6	-4.23173E-6	6.91331E-6	5.29293E-4
M	-4.16081E-5	-2.30356E-5	-6.82806E-4	-3.24136E-4	5.29293E-4	4.05411E-2

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

26.118

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

16 - 40*

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

1295

Unit

Source

[1]

Normalized RMS of residuals

Value

0.540465

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-11-22.436279

Unit

Source

[2]

Last Observation

Value

2021-12-19.38946

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

45 (4)

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 2021WJ3 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	1951-12-11 18:58	> 1 mo	0.0261118	0.0230320	0.3468019
EARTH	1983-12-11 15:16	> 1 w	0.0266562	0.0229221	0.0234912
EARTH	2021-12-11 23:11	< 1 min	0.0253770	0.0253417	0.0000118
EARTH	2025-01-25 18:49	653.7	0.1748711	0.1619797	0.0043339
EARTH	2065-12-13 03:24	> 1 w	0.0243319	0.0242538	0.0041171
EARTH	2069-01-25 11:35	> 1 w	0.1688379	0.0737814	0.2424596
EARTH	2109-11-26 07:41	> 1 mo	0.1782538	0.0007296	2.5208128
EARTH	2112-12-16 07:25	> 1 mo	0.0272623	0.0242924	0.9745814

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
344.52894797	339.80874477	0.02476162	MINIMUM
182.60251311	181.17327234	0.63269610	SADDLE
0.78926712	180.15569054	2.01014604	SADDLE
179.39641485	358.66916206	2.62681423	MAXIMUM

Download:

MOID Plots

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