Asteroids

2021QE3 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.660

Aphelion (Q)

2.306

Eccentricity (e)

0.555

Inclination (i)

8.6

deg

Orbit period (P)

659.7

Earth MOID

0.06368

U parameter

8.6

Next Earth close approach

Date

2070-02-13

Nominal distance (from Earth center)

0.14072

21051999

Maximum Brightness

22.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.5

mag

Diameter

50 - 120*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-08-31

Observatory

Pan-STARRS 2, Haleakala

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

1.483072

1-sigma variation

0.003291

Unit

Eccentricity (e)

Value

0.554855

1-sigma variation

0.001249

Unit

Inclination (i)

Value

8.5997

1-sigma variation

0.0223

Unit

Long. of Ascending Node (Ω)

Value

175.4529

1-sigma variation

0.0219

Unit

Arg. of Perihelion (ω)

Value

59.5249

1-sigma variation

0.0404

Unit

Mean Anomaly (M)

Value

157.78842

1-sigma variation

2.97475

Unit

Perihelion distance

Value

0.660182

1-sigma variation

Unit

Aphelion distance

Value

2.305962

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.194789

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.423177

1-sigma variation

Unit

MOID

Value

0.063683

1-sigma variation

Unit

Orbit Period

Value

659.6930

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.08326E-5	4.11203E-6	7.33475E-5	-7.18943E-5	1.32703E-4	-9.79078E-3
e	4.11203E-6	1.56112E-6	2.78369E-5	-2.72807E-5	5.03400E-5	-3.71656E-3
i	7.33475E-5	2.78369E-5	4.96795E-4	-4.87086E-4	8.99466E-4	-6.62931E-2
Ω	-7.18943E-5	-2.72807E-5	-4.87086E-4	4.77683E-4	-8.82437E-4	6.49795E-2
ω	1.32703E-4	5.03400E-5	8.99466E-4	-8.82437E-4	1.63129E-3	-1.19939E-1
M	-9.79078E-3	-3.71656E-3	-6.62931E-2	6.49795E-2	-1.19939E-1	8.84914E0

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

23.452

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

50 - 120*

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

1516

Unit

Source

[1]

Normalized RMS of residuals

Value

0.551776

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-08-31.29936

Unit

Source

[2]

Last Observation

Value

2021-09-08.373116

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

30 (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 2021QE3 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	1969-08-21 14:24	> 1 mo	0.1000865	0.0796182	59.1436230
EARTH	1971-02-22 07:31	> 1 mo	0.0742671	0.0657611	26.6710375
VENUS	1974-10-21 13:00	> 1 mo	0.0171293	0.0032864	24.2674423
EARTH	2012-08-19 08:42	> 1 mo	0.0799004	0.0782783	0.4766671
EARTH	2014-02-21 14:19	> 1 mo	0.0678474	0.0639950	0.3799944
VENUS	2016-01-08 00:12	> 1 w	0.0062057	0.0019740	0.1119802
EARTH	2021-08-19 22:51	< 1 min	0.0852939	0.0847303	0.0001879
EARTH	2023-03-01 07:37	> 1 d	0.1306871	0.0678300	0.0334268
EARTH	2070-02-13 03:21	> 1 d	0.1407239	0.0635205	0.0649973
EARTH	2077-08-17 15:25	> 1 w	0.0795918	0.0767823	0.0422358
EARTH	2079-02-25 12:22	> 1 w	0.0916443	0.0629118	0.1352832
VENUS	2100-12-04 18:13	> 1 mo	0.0296155	0.0021034	0.4536619
EARTH	2117-02-15 17:11	> 1 mo	0.1157366	0.0615220	1.5572510
EARTH	2124-08-23 16:45	> 1 mo	0.1061777	0.0749015	1.8196376

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
308.43012573	48.11499942	0.06354090	MINIMUM
56.30233746	223.67148147	0.07864965	MINIMUM
3.62374077	138.31715011	0.36799742	SADDLE
181.05471734	313.32806014	1.33172654	SADDLE
1.96287497	315.16005460	1.64527738	SADDLE
180.19397907	132.87381336	3.31118967	MAXIMUM

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MOID Plots

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