Asteroids

2021TK11 help

Last update: 2025-04-09 07:59 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.943

Aphelion (Q)

3.235

Eccentricity (e)

0.548

Inclination (i)

1.2

deg

Orbit period (P)

1103.1

Earth MOID

0.00104

U parameter

7.3

Next Earth close approach

Date

2027-10-26

Nominal distance (from Earth center)

0.12169

18204778

Maximum Brightness

26.5

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

28.6

mag

Diameter

5 - 11*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-10-11

Observatory

ATLAS-HKO, 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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.089342

1-sigma variation

0.001205

Unit

Eccentricity (e)

Value

0.548428

1-sigma variation

0.000211

Unit

Inclination (i)

Value

1.1979

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

20.1867

1-sigma variation

0.0024

Unit

Arg. of Perihelion (ω)

Value

324.7915

1-sigma variation

0.0356

Unit

Mean Anomaly (M)

Value

75.15152

1-sigma variation

0.01864

Unit

Perihelion distance

Value

0.943488

1-sigma variation

Unit

Aphelion distance

Value

3.235196

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.011266

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.646014

1-sigma variation

Unit

MOID

Value

0.001038

1-sigma variation

Unit

Orbit Period

Value

1103.0946

1-sigma variation

Unit

U parameter

Value

7.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.45304E-6	2.54298E-7	2.16790E-7	-2.90490E-6	4.28824E-5	2.24658E-5
e	2.54298E-7	4.45047E-8	3.79401E-8	-5.08388E-7	7.50487E-6	3.93175E-6
i	2.16790E-7	3.79401E-8	3.26644E-8	-4.33496E-7	6.39813E-6	3.35183E-6
Ω	-2.90490E-6	-5.08388E-7	-4.33496E-7	5.80761E-6	-8.57301E-5	-4.49133E-5
ω	4.28824E-5	7.50487E-6	6.39813E-6	-8.57301E-5	1.26556E-3	6.63015E-4
M	2.24658E-5	3.93175E-6	3.35183E-6	-4.49133E-5	6.63015E-4	3.47349E-4

Date of computation: 2025-04-09 07:59 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

28.616

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

5 - 11*

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

1338

Unit

Source

[1]

Normalized RMS of residuals

Value

0.662192

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-10-11.491861

Unit

Source

[2]

Last Observation

Value

2021-10-15.41029

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

62 (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 2021TK11 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	2018-10-29 17:48	453.3	0.1698069	0.1554650	0.0047806
EARTH	2021-10-11 01:20	< 1 s	0.0009094	0.0009090	0.0000001
EARTH	2024-10-13 23:27	979.8	0.0188778	0.0065790	0.0041093
EARTH	2027-10-26 20:30	1305.7	0.1216914	0.0879717	0.0112400
MARS	2079-05-26 09:19	> 1 w	0.0370739	0.0017522	0.1659840

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
17.81933006	276.25931096	0.00110207	MINIMUM
339.69714379	206.81392400	0.02025544	MINIMUM
358.30884200	240.77013346	0.06542545	SADDLE
358.61406212	61.32390429	1.93487844	SADDLE
179.58410782	62.49372049	2.22826299	SADDLE
179.59009765	242.49274425	4.22720442	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2021TK11

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2064-10-12.979	75205.979	-3.601	0.96 ± 0.000	9.67E4	1.43E-8	1.28E-10	-9.56
2067-10-13.731	76301.731	-3.526	1.27 ± 0.000	7.00E4	3.36E-8	3.02E-10	-9.23
2111-10-14.660	92372.660	-3.938	0.59 ± 0.000	9.83E4	5.18E-9	4.62E-11	-10.34


Based on 62 optical observations (of which 0 are rejected as outliers) from 2021/10/11.492 to 2021/10/15.410.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.49 and 1.49 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250305 083321.558 UTC.

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Download Impactor Table as: