Asteroids

2021AE4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.971

Aphelion (Q)

1.348

Eccentricity (e)

0.162

Inclination (i)

15.8

deg

Orbit period (P)

456.1

Earth MOID

0.03886

U parameter

1.3

Next Earth close approach

Date

2026-05-03

Nominal distance (from Earth center)

0.06896

10315542

Maximum Brightness

20.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.7

mag

Diameter

120 - 280*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-01-06

Observatory

Pan-STARRS 1, 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

1.159655

1-sigma variation

3.950E-8

Unit

Eccentricity (e)

Value

0.162396

1-sigma variation

2.757E-7

Unit

Inclination (i)

Value

15.7744

1-sigma variation

1.430E-5

Unit

Long. of Ascending Node (Ω)

Value

49.5398

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

172.4209

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

233.69289

1-sigma variation

0.00005

Unit

Perihelion distance

Value

0.971332

1-sigma variation

Unit

Aphelion distance

Value

1.347979

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.355743

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.038859

1-sigma variation

Unit

MOID

Value

0.038855

1-sigma variation

Unit

Orbit Period

Value

456.1333

1-sigma variation

Unit

U parameter

Value

1.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.56044E-15	-1.00437E-14	-2.11808E-13	2.05470E-12	-5.38880E-12	-7.41895E-13
e	-1.00437E-14	7.59890E-14	1.22153E-12	-1.66047E-11	3.96131E-11	4.37037E-12
i	-2.11808E-13	1.22153E-12	2.04383E-10	1.95287E-10	6.90878E-10	-3.06561E-10
Ω	2.05470E-12	-1.66047E-11	1.95287E-10	1.02802E-8	-1.43436E-8	-1.48045E-9
ω	-5.38880E-12	3.96131E-11	6.90878E-10	-1.43436E-8	2.77957E-8	1.13888E-9
M	-7.41895E-13	4.37037E-12	-3.06561E-10	-1.48045E-9	1.13888E-9	2.09268E-9

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

21.663

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

120 - 280*

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

1665

Unit

Source

[1]

Unobserved

Value

1638

Unit

Source

[1]

Normalized RMS of residuals

Value

0.431459

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2016-09-10.35172

Unit

Source

[2]

Last Observation

Value

2021-04-02.46979

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

40 (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 2021AE4 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	2001-04-21 06:22	1.2	0.1553520	0.1553257	0.0000087
EARTH	2006-04-29 10:45	1.1	0.0953847	0.0953653	0.0000065
EARTH	2011-05-05 09:25	< 1 min	0.0570369	0.0570276	0.0000031
EARTH	2016-05-07 01:13	< 1 min	0.0445136	0.0445118	0.0000006
EARTH	2021-05-06 15:58	< 1 min	0.0472974	0.0472961	0.0000004
EARTH	2026-05-03 04:57	< 1 min	0.0689551	0.0689504	0.0000016
EARTH	2031-04-26 20:31	< 1 min	0.1163901	0.1163822	0.0000027
EARTH	2036-04-17 09:23	< 1 min	0.1838677	0.1838575	0.0000034
EARTH	2097-05-28 17:32	< 1 min	0.1493581	0.1493461	0.0000040
EARTH	2102-05-22 17:07	< 1 min	0.0943637	0.0943548	0.0000030
EARTH	2107-05-17 20:22	< 1 min	0.0596657	0.0596612	0.0000015
EARTH	2112-05-14 23:23	< 1 min	0.0478058	0.0478046	0.0000004
EARTH	2117-05-16 04:42	< 1 min	0.0528677	0.0528670	0.0000002
EARTH	2122-05-20 17:57	< 1 min	0.0802415	0.0802392	0.0000007

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
6.55198453	126.67653902	0.03724833	MINIMUM
139.84883400	267.09440845	0.36784480	SADDLE
3.99812050	303.76928164	1.96238974	SADDLE
184.16987559	124.01804555	2.35636335	MAXIMUM

Download:

MOID Plots

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