Asteroids

2021GE2 help

Last update: 2024-04-25 23:56 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.610

Aphelion (Q)

1.754

Eccentricity (e)

0.484

Inclination (i)

10.2

deg

Orbit period (P)

469.4

Earth MOID

0.00001

U parameter

7.5

Next Earth close approach

Date

2030-04-02

Nominal distance (from Earth center)

0.02246

3359495

Maximum Brightness

23.1

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

4 - 9*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-04-04

Observatory

Mt. Lemmon Survey

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.182060

1-sigma variation

0.000385

Unit

Eccentricity (e)

Value

0.484233

1-sigma variation

0.000292

Unit

Inclination (i)

Value

10.2156

1-sigma variation

0.0070

Unit

Long. of Ascending Node (Ω)

Value

13.3973

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

78.6798

1-sigma variation

0.0021

Unit

Mean Anomaly (M)

Value

163.20367

1-sigma variation

0.44477

Unit

Perihelion distance

Value

0.609667

1-sigma variation

Unit

Aphelion distance

Value

1.754452

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.172530

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.000037

1-sigma variation

Unit

MOID

Value

0.000012

1-sigma variation

Unit

Orbit Period

Value

469.4156

1-sigma variation

Unit

U parameter

Value

7.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.48554E-7	1.12699E-7	2.69483E-6	-2.20088E-8	7.98779E-7	-1.71426E-4
e	1.12699E-7	8.54997E-8	2.04445E-6	-1.66799E-8	6.05881E-7	-1.30051E-4
i	2.69483E-6	2.04445E-6	4.88864E-5	-3.98690E-7	1.44868E-5	-3.10973E-3
Ω	-2.20088E-8	-1.66799E-8	-3.98690E-7	3.61708E-9	-1.20303E-7	2.53967E-5
ω	7.98779E-7	6.05881E-7	1.44868E-5	-1.20303E-7	4.30752E-6	-9.21757E-4
M	-1.71426E-4	-1.30051E-4	-3.10973E-3	2.53967E-5	-9.21757E-4	1.97819E-1

Date of computation: 2024-04-23 10:08 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

29.019

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 - 9*

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 ODIM	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

1107

Unit

Source

[1]

Normalized RMS of residuals

Value

0.56887

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1950-09-14 04:51	> 1 d	0.0819370	0.0783180	0.0149065
EARTH	1952-04-08 11:20	> 1 d	0.1307522	0.0006691	0.0583283
EARTH	1955-09-20 00:55	> 1 d	0.1315733	0.0813055	0.0558414
VENUS	2004-11-14 13:54	> 1 d	0.0474344	0.0434287	0.0177517
EARTH	2011-03-27 12:14	1422.6	0.1609359	0.0783235	0.0275411
EARTH	2014-09-03 20:05	1214.6	0.1897796	0.1426602	0.0162931
EARTH	2016-03-30 22:43	1003.1	0.0672064	0.0191187	0.0160293
EARTH	2019-09-07 20:50	240.5	0.1251955	0.1170083	0.0027899
EARTH	2021-04-03 07:54	< 1 min	0.0016055	0.0016023	0.0000011
EARTH	2030-04-02 11:09	> 1 d	0.0224568	0.0000902	0.0259998
EARTH	2039-03-28 21:39	> 1 d	0.1258292	0.0024261	0.0712790
EARTH	2060-09-21 00:40	> 1 w	0.1089625	0.0684625	0.1775391
EARTH	2069-09-12 11:23	> 1 w	0.0910633	0.0664354	0.2198263
VENUS	2073-10-10 13:52	> 1 w	0.0433490	0.0428224	0.0661738
EARTH	2080-04-07 22:55	> 1 mo	0.1006335	0.0026202	0.7978404
EARTH	2089-04-01 16:48	> 1 mo	0.0399711	0.0019542	1.1630933
EARTH	2110-09-25 07:17	> 1 mo	0.1358744	0.0694575	2.0375593
EARTH	2119-09-16 18:45	> 1 mo	0.0666128	0.0649322	0.6864679

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2021GE2

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS	TS
2030-04-03.499	62594.499	0.865	0.000	0.98 ± 0.000	6.13E2	6.74E-4	4.99E-6	-4.17	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=20240110 090429.835 UTC.

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Download Impactor Table as: