Asteroids

2021WA5 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.952

Aphelion (Q)

1.659

Eccentricity (e)

0.271

Inclination (i)

3.4

deg

Orbit period (P)

544.6

Earth MOID

0.00236

U parameter

8.2

Next Earth close approach

Date

2027-11-23

Nominal distance (from Earth center)

0.13341

19957523

Maximum Brightness

25.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.2

mag

Diameter

10 - 22*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-11-29

Observatory

Kitt Peak-Bok

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

1.305079

1-sigma variation

0.001365

Unit

Eccentricity (e)

Value

0.270819

1-sigma variation

0.000512

Unit

Inclination (i)

Value

3.4049

1-sigma variation

0.0055

Unit

Long. of Ascending Node (Ω)

Value

256.7652

1-sigma variation

0.0217

Unit

Arg. of Perihelion (ω)

Value

215.2817

1-sigma variation

0.1830

Unit

Mean Anomaly (M)

Value

210.40693

1-sigma variation

0.08218

Unit

Perihelion distance

Value

0.951639

1-sigma variation

Unit

Aphelion distance

Value

1.658518

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.536339

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.005238

1-sigma variation

Unit

MOID

Value

0.002355

1-sigma variation

Unit

Orbit Period

Value

544.5697

1-sigma variation

Unit

U parameter

Value

8.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.86244E-6	6.98086E-7	-7.48463E-6	2.95883E-5	-2.49687E-4	1.12153E-4
e	6.98086E-7	2.61659E-7	-2.80539E-6	1.10904E-5	-9.35882E-5	4.20374E-5
i	-7.48463E-6	-2.80539E-6	3.00801E-5	-1.18908E-4	1.00344E-3	-4.50720E-4
Ω	2.95883E-5	1.10904E-5	-1.18908E-4	4.70065E-4	-3.96674E-3	1.78176E-3
ω	-2.49687E-4	-9.35882E-5	1.00344E-3	-3.96674E-3	3.34743E-2	-1.50358E-2
M	1.12153E-4	4.20374E-5	-4.50720E-4	1.78176E-3	-1.50358E-2	6.75373E-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

27.203

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

10 - 22*

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

[-]

Download this part as:

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

1385

Unit

Source

[1]

Normalized RMS of residuals

Value

0.574317

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-11-29.299216

Unit

Source

[2]

Last Observation

Value

2021-12-06.51743

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

30 (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 2021WA5 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	1950-12-17 03:04	> 1 mo	0.0150001	0.0003649	0.1068799
EARTH	1953-12-18 18:15	> 1 w	0.0192272	0.0006026	0.0333453
EARTH	1957-01-25 14:51	> 1 w	0.0493817	0.0486816	0.0052994
EARTH	1960-02-23 13:51	> 1 w	0.0802198	0.0548286	0.0583245
EARTH	1963-03-07 14:17	> 1 d	0.1900540	0.0583506	0.0860710
EARTH	2018-11-22 18:06	786.5	0.1363879	0.1112106	0.0083940
EARTH	2021-12-05 20:53	< 1 min	0.0222526	0.0221988	0.0000179
EARTH	2024-12-05 13:43	> 1 d	0.0221511	0.0016030	0.0076432
EARTH	2027-11-23 12:53	> 1 d	0.1334078	0.0702381	0.0210714
EARTH	2086-02-27 20:54	> 1 mo	0.0887013	0.0567409	0.2647797
EARTH	2089-01-31 21:54	> 1 mo	0.0522836	0.0520890	0.0128243
EARTH	2091-12-22 13:53	> 1 mo	0.0258656	0.0002852	0.1535557
EARTH	2094-12-10 19:46	> 1 mo	0.0040949	0.0034513	0.1120371
EARTH	2120-01-19 04:09	> 1 mo	0.0500237	0.0439662	14.2469466

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
334.52762955	336.93756091	0.00226314	MINIMUM
180.91074092	190.54624313	0.64401741	SADDLE
0.83410848	190.66717074	1.96737968	SADDLE
180.21667494	10.01243741	2.64202422	MAXIMUM

Download:

MOID Plots

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