Asteroids

2021WZ5 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.990

Aphelion (Q)

1.228

Eccentricity (e)

0.107

Inclination (i)

2.4

deg

Orbit period (P)

426.5

Earth MOID

0.01026

U parameter

6.3

Next Earth close approach

Date

2029-01-07

Nominal distance (from Earth center)

0.04334

6482977

Maximum Brightness

24.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.8

mag

Diameter

5 - 10*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-11-27

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

1.108923

1-sigma variation

0.000053

Unit

Eccentricity (e)

Value

0.107284

1-sigma variation

0.000040

Unit

Inclination (i)

Value

2.4260

1-sigma variation

0.0016

Unit

Long. of Ascending Node (Ω)

Value

249.5918

1-sigma variation

0.0048

Unit

Arg. of Perihelion (ω)

Value

203.7194

1-sigma variation

0.0078

Unit

Mean Anomaly (M)

Value

124.28114

1-sigma variation

0.08377

Unit

Perihelion distance

Value

0.989953

1-sigma variation

Unit

Aphelion distance

Value

1.227893

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.200122

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.012036

1-sigma variation

Unit

MOID

Value

0.010263

1-sigma variation

Unit

Orbit Period

Value

426.5307

1-sigma variation

Unit

U parameter

Value

6.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.79310E-9	2.12609E-9	8.22921E-8	2.52140E-7	-4.13260E-7	-4.42740E-6
e	2.12609E-9	1.61838E-9	6.26372E-8	1.91920E-7	-3.14554E-7	-3.37012E-6
i	8.22921E-8	6.26372E-8	2.42548E-6	7.43081E-6	-1.21801E-5	-1.30442E-4
Ω	2.52140E-7	1.91920E-7	7.43081E-6	2.27662E-5	-3.73162E-5	-3.99669E-4
ω	-4.13260E-7	-3.14554E-7	-1.21801E-5	-3.73162E-5	6.11706E-5	6.55056E-4
M	-4.42740E-6	-3.37012E-6	-1.30442E-4	-3.99669E-4	6.55056E-4	7.01799E-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

28.79

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

5 - 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

[-]

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

1374

Unit

Source

[1]

Normalized RMS of residuals

Value

0.341072

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-11-27.21576

Unit

Source

[2]

Last Observation

Value

2021-12-12.232681

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

21 (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 2021WZ5 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	1955-04-30 04:24	> 1 mo	0.1774055	0.1552538	0.0177965
EARTH	1969-07-21 10:37	> 1 mo	0.1846626	0.1565979	0.0862709
EARTH	1976-09-19 04:05	> 1 mo	0.1229744	0.0140324	0.3363035
EARTH	1977-01-09 20:21	> 1 mo	0.1050371	0.0177064	0.6108377
EARTH	1983-12-09 00:27	> 1 d	0.0081660	0.0076513	0.0011772
EARTH	1991-07-05 11:12	> 1 d	0.1900241	0.1890957	0.0003148
EARTH	1998-11-16 06:32	577.6	0.1234758	0.0963469	0.0090477
EARTH	1999-04-02 09:48	> 1 w	0.1287632	0.1185265	0.0035710
EARTH	2006-08-17 15:01	> 1 w	0.1592367	0.1533100	0.0020020
EARTH	2014-05-29 20:14	> 1 d	0.1832607	0.1816345	0.0005558
EARTH	2021-12-13 05:10	< 1 min	0.0117124	0.0116953	0.0000057
EARTH	2029-01-07 10:58	> 1 d	0.0433360	0.0355490	0.0026443
EARTH	2048-11-23 07:04	> 1 d	0.0575852	0.0032483	0.0378021
EARTH	2056-01-19 13:06	> 1 w	0.0712927	0.0262665	0.0965429
EARTH	2075-11-18 10:35	> 1 w	0.1134536	0.0003372	0.2725438
EARTH	2076-03-27 22:06	> 1 mo	0.1323670	0.0801879	0.1288689
EARTH	2082-10-09 05:22	> 1 mo	0.1196926	0.0453012	0.0912059
EARTH	2083-01-24 15:44	> 1 w	0.0972989	0.0289496	0.1320028
EARTH	2102-12-03 13:02	> 1 mo	0.0196326	0.0097001	0.5718973
EARTH	2110-05-21 18:14	> 1 mo	0.1824880	0.1599426	2.1374945
EARTH	2124-09-26 13:03	> 1 mo	0.1290231	0.0271667	17.9321579
EARTH	2125-02-01 11:11	> 1 mo	0.1172031	0.0336908	32.6419217

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
344.51882947	334.28019169	0.01013172	MINIMUM
180.65201510	171.55059108	0.21262697	SADDLE
358.57071146	169.66117583	2.00593422	SADDLE
178.60883034	349.69705170	2.21167192	MAXIMUM

Download:

MOID Plots

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