Asteroids

2021GX3 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.936

Aphelion (Q)

1.245

Eccentricity (e)

0.142

Inclination (i)

10.0

deg

Orbit period (P)

415.8

Earth MOID

0.01988

U parameter

7.5

Next Earth close approach

Date

2029-04-10

Nominal distance (from Earth center)

0.1893

28318175

Maximum Brightness

26.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

11 - 24*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-04-07

Observatory

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.090174

1-sigma variation

0.000315

Unit

Eccentricity (e)

Value

0.141657

1-sigma variation

0.000351

Unit

Inclination (i)

Value

9.9651

1-sigma variation

0.0206

Unit

Long. of Ascending Node (Ω)

Value

23.4037

1-sigma variation

0.0006

Unit

Arg. of Perihelion (ω)

Value

254.9227

1-sigma variation

0.0192

Unit

Mean Anomaly (M)

Value

316.66833

1-sigma variation

0.57875

Unit

Perihelion distance

Value

0.935743

1-sigma variation

Unit

Aphelion distance

Value

1.244605

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.112197

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.026165

1-sigma variation

Unit

MOID

Value

0.019878

1-sigma variation

Unit

Orbit Period

Value

415.7594

1-sigma variation

Unit

U parameter

Value

7.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.91887E-8	1.10483E-7	6.48606E-6	-1.95907E-7	-6.04919E-6	-1.82272E-4
e	1.10483E-7	1.23064E-7	7.22463E-6	-2.18215E-7	-6.73788E-6	-2.03027E-4
i	6.48606E-6	7.22463E-6	4.24137E-4	-1.28112E-5	-3.95552E-4	-1.19190E-2
Ω	-1.95907E-7	-2.18215E-7	-1.28112E-5	3.87067E-7	1.19468E-5	3.60006E-4
ω	-6.04919E-6	-6.73788E-6	-3.95552E-4	1.19468E-5	3.68961E-4	1.11162E-2
M	-1.82272E-4	-2.03027E-4	-1.19190E-2	3.60006E-4	1.11162E-2	3.34949E-1

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

27.01

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

11 - 24*

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

1620

Unit

Source

[1]

Normalized RMS of residuals

Value

0.475195

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-04-05.34973

Unit

Source

[2]

Last Observation

Value

2021-04-17.286351

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (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 2021GX3 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	1955-10-02 17:25	> 1 mo	0.0971874	0.0834986	0.4293719
EARTH	1963-04-18 11:40	> 1 d	0.0202650	0.0201609	0.0077044
EARTH	1980-09-26 18:41	554.0	0.0940402	0.0841605	0.0037831
EARTH	1988-04-22 20:14	> 1 d	0.1292328	0.0143116	0.0441349
EARTH	1988-10-17 17:13	> 1 w	0.1683460	0.1180838	0.0297584
EARTH	1996-04-14 08:36	> 1 d	0.0856697	0.0193289	0.0715112
EARTH	2013-09-30 22:52	> 1 d	0.0885932	0.0809497	0.0088123
EARTH	2021-04-18 09:09	< 1 min	0.0238296	0.0236827	0.0000489
EARTH	2029-04-10 09:16	940.9	0.1892953	0.1248794	0.0215163
EARTH	2038-09-27 14:02	727.1	0.1751484	0.0883153	0.0360446
EARTH	2046-09-30 14:11	> 1 d	0.0868718	0.0811036	0.0180822
EARTH	2054-04-21 03:09	> 1 d	0.0765428	0.0194067	0.0757747
EARTH	2062-04-14 19:02	> 1 d	0.0885087	0.0206109	0.0583955
EARTH	2079-09-27 08:49	1372.4	0.0995398	0.0799651	0.0366508
EARTH	2087-04-12 14:30	> 1 w	0.1922185	0.0495322	0.1076942
EARTH	2087-10-08 11:41	> 1 w	0.1271991	0.0927548	0.0738767
EARTH	2095-04-19 05:15	> 1 d	0.0287678	0.0221609	0.0963381
EARTH	2103-04-15 22:55	> 1 w	0.0918382	0.0207210	0.3913380
EARTH	2120-09-28 04:32	> 1 d	0.1799493	0.0810529	0.3283329

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
296.99298801	104.60443491	0.02089994	MINIMUM
78.39242124	263.69243618	0.08083834	MINIMUM
10.18674900	187.89261771	0.18645554	SADDLE
186.78109197	1.78528484	0.32173648	SADDLE
1.66865317	357.75684836	1.91264143	SADDLE
179.01098062	175.04417382	2.25299690	MAXIMUM

Download:

MOID Plots

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