Asteroids

2021TE4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.860

Aphelion (Q)

1.425

Eccentricity (e)

0.247

Inclination (i)

2.6

deg

Orbit period (P)

446.1

Earth MOID

0.01167

U parameter

7.4

Next Earth close approach

Date

2032-10-16

Nominal distance (from Earth center)

0.0323

4831690

Maximum Brightness

22.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.9

mag

Diameter

11 - 24*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-10-06

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

1.142506

1-sigma variation

0.000304

Unit

Eccentricity (e)

Value

0.246900

1-sigma variation

0.000344

Unit

Inclination (i)

Value

2.5849

1-sigma variation

0.0041

Unit

Long. of Ascending Node (Ω)

Value

191.4466

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

267.2095

1-sigma variation

0.0027

Unit

Mean Anomaly (M)

Value

77.10976

1-sigma variation

0.45513

Unit

Perihelion distance

Value

0.860421

1-sigma variation

Unit

Aphelion distance

Value

1.424591

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.085422

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.059504

1-sigma variation

Unit

MOID

Value

0.011675

1-sigma variation

Unit

Orbit Period

Value

446.0526

1-sigma variation

Unit

U parameter

Value

7.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.26444E-8	1.04743E-7	1.24452E-6	1.36097E-7	7.25221E-7	-1.38529E-4
e	1.04743E-7	1.18423E-7	1.40703E-6	1.53884E-7	8.20163E-7	-1.56620E-4
i	1.24452E-6	1.40703E-6	1.67765E-5	1.82371E-6	1.00609E-5	-1.86120E-3
Ω	1.36097E-7	1.53884E-7	1.82371E-6	2.01056E-7	1.04240E-6	-2.03481E-4
ω	7.25221E-7	8.20163E-7	1.00609E-5	1.04240E-6	7.47952E-6	-1.08604E-3
M	-1.38529E-4	-1.56620E-4	-1.86120E-3	-2.03481E-4	-1.08604E-3	2.07142E-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

26.93

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

11 - 24*

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

1442

Unit

Source

[1]

Normalized RMS of residuals

Value

0.582964

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-30.433447

Unit

Source

[2]

Last Observation

Value

2021-10-07.06582

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

11 (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 2021TE4 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	1953-10-18 06:33	1180.5	0.0181330	0.0129593	0.0031712
EARTH	1960-03-10 04:48	> 1 d	0.0259137	0.0161102	0.0104420
EARTH	1970-10-10 19:45	> 1 d	0.1215415	0.0163243	0.0356144
EARTH	1977-01-01 12:17	> 1 w	0.1323314	0.1300600	0.0007590
EARTH	1983-03-22 02:59	> 1 d	0.1309356	0.0288451	0.0350313
EARTH	1993-10-21 11:10	> 1 d	0.0228605	0.0115435	0.0162368
EARTH	2000-03-15 09:51	> 1 d	0.0477348	0.0160902	0.0471392
EARTH	2011-01-06 02:18	> 1 w	0.1298498	0.1224782	0.0024584
EARTH	2021-10-21 20:09	2.4	0.0213279	0.0212328	0.0000317
EARTH	2032-10-16 22:26	> 1 d	0.0322979	0.0116029	0.0247360
EARTH	2039-03-18 00:00	> 1 d	0.0721782	0.0141219	0.0439823
EARTH	2050-02-16 08:50	> 1 mo	0.0911560	0.0075155	0.0693994
EARTH	2060-12-04 18:46	> 1 mo	0.1177797	0.0245141	0.0316034
EARTH	2071-10-16 19:30	> 1 d	0.0458493	0.0115376	0.0596294
EARTH	2078-03-13 14:06	> 1 d	0.0171114	0.0149337	0.0348628
EARTH	2089-03-03 06:48	> 1 mo	0.0603999	0.0125643	0.9116565
EARTH	2099-12-29 14:55	> 1 mo	0.1300380	0.0690966	0.0203383
EARTH	2110-10-28 03:10	241.5	0.0466343	0.0239640	0.0104286
EARTH	2121-10-19 19:12	> 1 mo	0.0260141	0.0136950	0.5133137

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
300.78152113	284.96710494	0.01175717	MINIMUM
58.92270133	67.60847211	0.01619003	MINIMUM
359.91601372	356.38721063	0.13002337	SADDLE
179.88830635	176.29786097	0.41191634	SADDLE
359.72140620	176.14351086	1.87621189	SADDLE
179.82445317	356.24902800	2.40770797	MAXIMUM

Download:

MOID Plots

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