Asteroids

2021TS3 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.018

Aphelion (Q)

1.296

Eccentricity (e)

0.120

Inclination (i)

7.4

deg

Orbit period (P)

454.7

Earth MOID

0.02791

U parameter

6.9

Next Earth close approach

Date

2026-10-06

Nominal distance (from Earth center)

0.13119

19625767

Maximum Brightness

25.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.2

mag

Diameter

10 - 22*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-10-05

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

1.157241

1-sigma variation

0.000146

Unit

Eccentricity (e)

Value

0.120108

1-sigma variation

0.000095

Unit

Inclination (i)

Value

7.3705

1-sigma variation

0.0051

Unit

Long. of Ascending Node (Ω)

Value

18.8416

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

22.5481

1-sigma variation

0.0080

Unit

Mean Anomaly (M)

Value

90.40925

1-sigma variation

0.21549

Unit

Perihelion distance

Value

1.018247

1-sigma variation

Unit

Aphelion distance

Value

1.296234

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.028376

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.280012

1-sigma variation

Unit

MOID

Value

0.027909

1-sigma variation

Unit

Orbit Period

Value

454.7095

1-sigma variation

Unit

U parameter

Value

6.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.14511E-8	1.38543E-8	7.50397E-7	3.50678E-8	-1.17755E-6	-3.15605E-5
e	1.38543E-8	8.94792E-9	4.84648E-7	2.26482E-8	-7.60473E-7	-2.03835E-5
i	7.50397E-7	4.84648E-7	2.62509E-5	1.22659E-6	-4.11911E-5	-1.10404E-3
Ω	3.50678E-8	2.26482E-8	1.22659E-6	5.75042E-8	-1.92561E-6	-5.15941E-5
ω	-1.17755E-6	-7.60473E-7	-4.11911E-5	-1.92561E-6	6.47076E-5	1.73245E-3
M	-3.15605E-5	-2.03835E-5	-1.10404E-3	-5.15941E-5	1.73245E-3	4.64343E-2

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

27.165

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

10 - 22*

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

1436

Unit

Source

[1]

Normalized RMS of residuals

Value

0.829971

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-10-02.403875

Unit

Source

[2]

Last Observation

Value

2021-10-18.141771

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

23 (1)

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 2021TS3 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	1965-10-26 10:08	382.8	0.1856400	0.1424401	0.0144001
EARTH	1970-10-17 02:17	861.8	0.0435651	0.0283511	0.0062418
EARTH	1975-10-12 14:20	> 1 d	0.0430897	0.0259617	0.0210684
EARTH	1980-10-01 22:28	1368.2	0.1856210	0.0974301	0.0294123
EARTH	2016-10-23 09:31	284.3	0.1405812	0.1228847	0.0059003
EARTH	2021-10-14 11:26	< 1 min	0.0278414	0.0277819	0.0000198
EARTH	2026-10-06 06:11	364.6	0.1311902	0.1136334	0.0058583
EARTH	2067-10-19 17:37	> 1 d	0.0767775	0.0205319	0.0260229
EARTH	2072-10-12 16:21	960.4	0.0349314	0.0273002	0.0056571
EARTH	2077-10-01 13:33	13.7	0.1991815	0.1973322	0.0006165
EARTH	2108-10-24 11:53	> 1 d	0.1449584	0.0070184	0.0544771
EARTH	2113-10-13 22:05	> 1 d	0.0349616	0.0275382	0.0287389

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
341.89295303	279.63787216	0.02833981	MINIMUM
186.57964298	124.17367187	0.29451555	SADDLE
354.02750959	113.13216694	2.02488557	SADDLE
173.60627772	292.67974884	2.28840323	MAXIMUM

Download:

MOID Plots

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