Asteroids

2021GE2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.610

Aphelion (Q)

1.755

Eccentricity (e)

0.484

Inclination (i)

10.2

deg

Orbit period (P)

469.4

Earth MOID

0.00050

U parameter

7.6

Next Earth close approach

Date

2030-04-02

Nominal distance (from Earth center)

0.02244

3356280

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

4 - 10*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-04-04

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

1.182075

1-sigma variation

0.000383

Unit

Eccentricity (e)

Value

0.484286

1-sigma variation

0.000292

Unit

Inclination (i)

Value

10.2151

1-sigma variation

0.0070

Unit

Long. of Ascending Node (Ω)

Value

13.3827

1-sigma variation

4.829E-5

Unit

Arg. of Perihelion (ω)

Value

78.6977

1-sigma variation

0.0021

Unit

Mean Anomaly (M)

Value

263.33884

1-sigma variation

0.66872

Unit

Perihelion distance

Value

0.609612

1-sigma variation

Unit

Aphelion distance

Value

1.754538

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.173487

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.001512

1-sigma variation

Unit

MOID

Value

0.000501

1-sigma variation

Unit

Orbit Period

Value

469.4247

1-sigma variation

Unit

U parameter

Value

7.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.46389E-7	1.11738E-7	2.67358E-6	-1.70041E-8	8.15571E-7	-2.55860E-4
e	1.11738E-7	8.52901E-8	2.04076E-6	-1.29622E-8	6.22413E-7	-1.95296E-4
i	2.67358E-6	2.04076E-6	4.88299E-5	-3.09995E-7	1.48918E-5	-4.67289E-3
Ω	-1.70041E-8	-1.29622E-8	-3.09995E-7	2.33184E-9	-9.66947E-8	2.97193E-5
ω	8.15571E-7	6.22413E-7	1.48918E-5	-9.66947E-8	4.55618E-6	-1.42545E-3
M	-2.55860E-4	-1.95296E-4	-4.67289E-3	2.97193E-5	-1.42545E-3	4.47193E-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

28.954

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

4 - 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

[-]

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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

1681

Unit

Source

[1]

Normalized RMS of residuals

Value

0.568936

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-04-04.180759

Unit

Source

[2]

Last Observation

Value

2021-04-15.348233

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

19 (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 2021GE2 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	1950-09-14 04:48	> 1 d	0.0819248	0.0783180	0.0148298
EARTH	1952-04-08 11:17	> 1 d	0.1307047	0.0006691	0.0581525
EARTH	1955-09-20 00:48	> 1 d	0.1315276	0.0813019	0.0557033
VENUS	2004-11-14 13:50	> 1 d	0.0474490	0.0434279	0.0177825
EARTH	2011-03-27 12:13	1422.6	0.1609585	0.0783422	0.0275423
EARTH	2014-09-03 20:04	1214.6	0.1897930	0.1426723	0.0162935
EARTH	2016-03-30 22:42	1003.0	0.0672196	0.0191327	0.0160290
EARTH	2019-09-07 20:50	240.4	0.1251978	0.1170107	0.0027899
EARTH	2021-04-03 07:54	< 1 min	0.0016055	0.0016023	0.0000011
EARTH	2030-04-02 11:10	> 1 d	0.0224353	0.0000901	0.0259994
EARTH	2039-03-28 21:35	> 1 d	0.1258882	0.0024284	0.0715032
EARTH	2060-09-21 00:21	> 1 w	0.1088157	0.0684528	0.1776580
EARTH	2069-09-12 11:02	> 1 w	0.0912452	0.0664395	0.2202568
VENUS	2073-10-10 13:16	> 1 w	0.0434051	0.0428200	0.0696315
EARTH	2080-04-07 22:12	> 1 mo	0.0999750	0.0026084	0.7958199
EARTH	2089-04-01 15:43	> 1 mo	0.0409296	0.0019614	1.1570748
EARTH	2110-09-25 11:05	> 1 mo	0.1375075	0.0696513	1.9154025
EARTH	2119-09-16 22:07	> 1 mo	0.0661028	0.0649206	0.5500129

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
71.45522950	90.23780128	0.00006530	MINIMUM
290.43754606	251.69320972	0.06634193	MINIMUM
1.05344114	351.70009086	0.39806639	SADDLE
180.66608001	169.96752213	0.77450562	SADDLE
359.89758062	169.76996533	1.61984688	SADDLE
179.58781551	349.31967972	2.72885378	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2021GE2

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2030-04-03.499	62594.499	0.865	0.000	0.98 ± 0.000	6.13E2	6.74E-4	7.40E-3	-4.08	0


Based on 19 optical observations (of which 0 are rejected as outliers) from 2021/04/04.181 to 2021/04/15.348.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.24 and 1.24 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: