Asteroids

2021OE1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.985

Aphelion (Q)

3.815

Eccentricity (e)

0.590

Inclination (i)

3.1

deg

Orbit period (P)

1357.9

Earth MOID

0.00273

U parameter

7.7

Next Earth close approach

Date

2058-08-22

Nominal distance (from Earth center)

0.04375

6545034

Maximum Brightness

28.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

26.1

mag

Diameter

16 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-07-30

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

2.399800

1-sigma variation

0.002660

Unit

Eccentricity (e)

Value

0.589526

1-sigma variation

0.000456

Unit

Inclination (i)

Value

3.0875

1-sigma variation

0.0016

Unit

Long. of Ascending Node (Ω)

Value

312.1775

1-sigma variation

0.0008

Unit

Arg. of Perihelion (ω)

Value

26.1453

1-sigma variation

0.0009

Unit

Mean Anomaly (M)

Value

50.98758

1-sigma variation

0.68563

Unit

Perihelion distance

Value

0.985056

1-sigma variation

Unit

Aphelion distance

Value

3.814545

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.008174

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.341081

1-sigma variation

Unit

MOID

Value

0.002727

1-sigma variation

Unit

Orbit Period

Value

1357.8791

1-sigma variation

Unit

U parameter

Value

7.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.07773E-6	1.21280E-6	4.35817E-6	2.08753E-6	-2.41711E-6	-1.82405E-3
e	1.21280E-6	2.07818E-7	7.46792E-7	3.57707E-7	-4.14182E-7	-3.12559E-4
i	4.35817E-6	7.46792E-7	2.68360E-6	1.28542E-6	-1.48834E-6	-1.12318E-3
Ω	2.08753E-6	3.57707E-7	1.28542E-6	6.15731E-7	-7.12916E-7	-5.37991E-4
ω	-2.41711E-6	-4.14182E-7	-1.48834E-6	-7.12916E-7	8.25864E-7	6.22930E-4
M	-1.82405E-3	-3.12559E-4	-1.12318E-3	-5.37991E-4	6.22930E-4	4.70090E-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

26.05

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

16 - 40*

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

1497

Unit

Source

[1]

Normalized RMS of residuals

Value

0.592679

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-07-30.34617

Unit

Source

[2]

Last Observation

Value

2021-08-08.593915

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

21 (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 2021OE1 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	1954-07-21 13:27	> 1 w	0.0741502	0.0055238	0.1549132
EARTH	1980-10-02 01:07	> 1 w	0.0549579	0.0429569	0.0879012
EARTH	2006-10-07 15:40	> 1 w	0.0981993	0.0430279	0.1303489
EARTH	2021-08-02 09:12	< 1 s	0.0160241	0.0159920	0.0000107
EARTH	2058-08-22 17:10	> 1 mo	0.0437508	0.0203721	0.0778135
EARTH	2084-07-16 07:00	> 1 mo	0.1428937	0.0027515	0.4264310

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
348.22671642	213.64493038	0.00317950	MINIMUM
358.98942621	54.81665294	1.97544992	SADDLE
179.75651846	55.70915867	2.82270325	SADDLE
179.70117477	235.67739681	4.82187959	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2021OE1

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2091-08-03.485	84996.485	-3.835	0.000	1.22 ± 0.000	6.39E3	7.44E-8	2.57E-1	-7.90	0


Based on 21 optical observations (of which 0 are rejected as outliers) from 2021/07/30.346 to 2021/08/08.594.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.51 and 1.51 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: