Asteroids

2021KO2

Last update: 2023-06-03 23:50 UTC

Orbital Properties

Epoch

60000.0

MJD

Orbit type

Aten

Perihelion (q)

0.573

Aphelion (Q)

1.419

Eccentricity (e)

0.424

Inclination (i)

16.9

deg

Orbit period (P)

363.2

Earth MOID

0.00224

U parameter

7.4

Next Earth close approach

Date

2024-05-28

Nominal distance (from Earth center)

0.07962

11911272

Maximum Brightness

25.1

mag

Risk

Object is not in risk list

Object is in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-05-30

Observatory

Tokyo-Kiso

Orbit Visualiser

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External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion
Aphelion
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

60000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.996213

1-sigma variation

0.000217

Unit

Eccentricity (e)

Value

0.424394

1-sigma variation

0.000128

Unit

Inclination (i)

Value

16.8655

1-sigma variation

0.0162

Unit

Ascending Node (Ω)

Value

69.0142

1-sigma variation

0.0005

Unit

Arg. of Perihelion (ω)

Value

62.2304

1-sigma variation

0.0338

Unit

Mean Anomaly (M)

Value

336.90647

1-sigma variation

0.05092

Unit

Perihelion

Value

0.573426

1-sigma variation

Unit

Aphelion

Value

1.419000

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.304912

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.004205

1-sigma variation

Unit

MOID

Value

0.002243

1-sigma variation

Unit

Orbit Period

Value

363.1841

1-sigma variation

Unit

U parameter

Value

7.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.69559E-8	-2.77541E-8	-3.51685E-6	1.09172E-7	7.32306E-6	-1.10335E-5
e	-2.77541E-8	1.64308E-8	2.07905E-6	-6.45245E-8	-4.32986E-6	6.51981E-6
i	-3.51685E-6	2.07905E-6	2.63420E-4	-8.17671E-6	-5.48494E-4	8.26352E-4
Ω	1.09172E-7	-6.45245E-8	-8.17671E-6	2.53828E-7	1.70259E-5	-2.56531E-5
ω	7.32306E-6	-4.32986E-6	-5.48494E-4	1.70259E-5	1.14215E-3	-1.72065E-3
M	-1.10335E-5	6.51981E-6	8.26352E-4	-2.56531E-5	-1.72065E-3	2.59272E-3

Date of computation: 2023-05-08 23:51 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

28.015

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

Unit

Source

[-]

Diameter

Value

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

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

733

Unit

Source

[1]

Astrometry Summary

RMS of Residuals
First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

RMS of Residuals

Value

0.792933

Unit

arcsec

Source

[1]

First Observation

Value

2021-05-30.554688

Unit

Source

[2]

Last Observation

Value

2021-06-01.1579

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

20 (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 2021KO2 from 1950 to 2123

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
VENUS	1966-07-27 09:45	> 1 w	0.0432883	0.0229226	0.1818354
VENUS	1997-05-02 12:30	> 1 d	0.0222112	0.0219935	0.0021650
EARTH	2017-06-05 04:21	178.5	0.1691375	0.1591523	0.0033284
EARTH	2018-06-03 15:24	137.1	0.1234990	0.1156737	0.0026084
EARTH	2019-06-02 05:53	92.3	0.0792717	0.0737527	0.0018397
EARTH	2020-05-31 01:14	46.7	0.0373613	0.0343696	0.0009974
EARTH	2021-05-30 03:60	< 1 s	0.0024779	0.0024746	0.0000011
EARTH	2022-05-30 04:19	40.6	0.0074100	0.0046840	0.0009380
EARTH	2023-05-29 12:40	31.5	0.0408164	0.0379659	0.0009503
EARTH	2024-05-28 00:04	58.9	0.0796219	0.0713453	0.0027591
EARTH	2025-05-27 21:15	10.3	0.1204749	0.1071157	0.0044534
EARTH	2026-05-28 09:30	150.0	0.1616574	0.1436516	0.0060028
VENUS	2028-02-06 06:03	1157.8	0.0252897	0.0201818	0.0064803
VENUS	2071-10-12 07:17	> 1 d	0.0297001	0.0198328	0.0317756
VENUS	2084-09-09 19:42	> 1 d	0.0211897	0.0190687	0.0081190

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