Asteroids

2021CZ5 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

1.006

Aphelion (Q)

1.316

Eccentricity (e)

0.133

Inclination (i)

17.0

deg

Orbit period (P)

456.8

Earth MOID

0.04348

U parameter

7.7

Next Earth close approach

Date

2026-02-09

Nominal distance (from Earth center)

0.04792

7168667

Maximum Brightness

20.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.9

mag

Diameter

17 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-02-10

Observatory

Pleasant Groves Observatory

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

1.160729

1-sigma variation

0.000469

Unit

Eccentricity (e)

Value

0.133484

1-sigma variation

0.000318

Unit

Inclination (i)

Value

16.9990

1-sigma variation

0.0247

Unit

Long. of Ascending Node (Ω)

Value

137.4661

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

38.3546

1-sigma variation

0.0228

Unit

Mean Anomaly (M)

Value

268.49960

1-sigma variation

0.80122

Unit

Perihelion distance

Value

1.005791

1-sigma variation

Unit

Aphelion distance

Value

1.315668

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.045255

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.258598

1-sigma variation

Unit

MOID

Value

0.043479

1-sigma variation

Unit

Orbit Period

Value

456.7672

1-sigma variation

Unit

U parameter

Value

7.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.20200E-7	1.48955E-7	1.15837E-5	-1.13784E-7	-1.01860E-5	-3.75968E-4
e	1.48955E-7	1.00828E-7	7.82860E-6	-7.85137E-8	-6.83231E-6	-2.54364E-4
i	1.15837E-5	7.82860E-6	6.10187E-4	-5.81871E-6	-5.41887E-4	-1.97736E-2
Ω	-1.13784E-7	-7.85137E-8	-5.81871E-6	9.50039E-8	3.93975E-6	1.95205E-4
ω	-1.01860E-5	-6.83231E-6	-5.41887E-4	3.93975E-6	5.21086E-4	1.73563E-2
M	-3.75968E-4	-2.54364E-4	-1.97736E-2	1.95205E-4	1.73563E-2	6.41948E-1

Date of computation: 2025-11-24 16:53 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

25.91

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

17 - 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

[-]

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

1817

Unit

Source

[1]

Normalized RMS of residuals

Value

0.797189

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-02-10.08731

Unit

Source

[2]

Last Observation

Value

2021-02-12.499708

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

30 (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

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 2021CZ5 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	2001-02-05 10:38	> 1 d	0.1353246	0.0421171	0.1652954
EARTH	2006-02-07 07:59	> 1 d	0.0778166	0.0433145	0.1044928
EARTH	2011-02-08 13:08	> 1 d	0.0495764	0.0436554	0.0280547
EARTH	2016-02-09 04:53	600.1	0.0440838	0.0437966	0.0021928
EARTH	2021-02-08 16:07	< 1 min	0.0442243	0.0440238	0.0000668
EARTH	2026-02-09 04:57	564.3	0.0479196	0.0439859	0.0076621
EARTH	2031-02-10 00:20	1350.5	0.0656034	0.0440766	0.0383845
EARTH	2036-02-11 02:11	> 1 d	0.1110255	0.0439844	0.0770216
EARTH	2041-02-10 22:39	513.3	0.1776494	0.0450930	0.1035126
EARTH	2105-02-05 12:39	> 1 d	0.1780626	0.0420305	0.1105352
EARTH	2110-02-07 13:28	> 1 d	0.1147028	0.0437411	0.0859000
EARTH	2115-02-09 01:04	> 1 d	0.0710657	0.0445819	0.0473917
EARTH	2120-02-09 21:18	705.6	0.0535350	0.0448877	0.0121174
EARTH	2125-02-09 04:38	318.9	0.0525341	0.0448587	0.0052719

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
328.22460520	37.76543464	0.04347918	MINIMUM
115.81507780	198.07370633	0.23652890	MINIMUM
51.79343842	132.16665612	0.30938344	SADDLE
219.33637236	289.25867000	0.42797010	SADDLE
16.26936090	270.89412756	1.99689405	SADDLE
177.57869854	71.90813590	2.30223081	MAXIMUM

Download:

MOID Plots

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