Asteroids

2020TH4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

1.013

Aphelion (Q)

2.153

Eccentricity (e)

0.360

Inclination (i)

9.3

deg

Orbit period (P)

727.6

Earth MOID

0.03367

U parameter

8.1

Next Earth close approach

Date

2026-09-21

Nominal distance (from Earth center)

0.09561

14303667

Maximum Brightness

24.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.9

mag

Diameter

11 - 25*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2020-10-11

Observatory

Mt. Lemmon Survey

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

1.583168

1-sigma variation

0.001974

Unit

Eccentricity (e)

Value

0.359993

1-sigma variation

0.000694

Unit

Inclination (i)

Value

9.3436

1-sigma variation

0.0204

Unit

Long. of Ascending Node (Ω)

Value

204.3611

1-sigma variation

0.0079

Unit

Arg. of Perihelion (ω)

Value

155.4481

1-sigma variation

0.0695

Unit

Mean Anomaly (M)

Value

210.29401

1-sigma variation

1.61578

Unit

Perihelion distance

Value

1.013238

1-sigma variation

Unit

Aphelion distance

Value

2.153097

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.044334

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.041445

1-sigma variation

Unit

MOID

Value

0.033668

1-sigma variation

Unit

Orbit Period

Value

727.5934

1-sigma variation

Unit

U parameter

Value

8.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.89753E-6	1.37095E-6	4.03427E-5	-1.55173E-5	1.37282E-4	-3.18990E-3
e	1.37095E-6	4.82229E-7	1.41905E-5	-5.45818E-6	4.82887E-5	-1.12204E-3
i	4.03427E-5	1.41905E-5	4.17583E-4	-1.60617E-4	1.42099E-3	-3.30182E-2
Ω	-1.55173E-5	-5.45818E-6	-1.60617E-4	6.17794E-5	-5.46564E-4	1.27000E-2
ω	1.37282E-4	4.82887E-5	1.42099E-3	-5.46564E-4	4.83556E-3	-1.12358E-1
M	-3.18990E-3	-1.12204E-3	-3.30182E-2	1.27000E-2	-1.12358E-1	2.61075E0

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

26.862

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 - 25*

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

1788

Unit

Source

[1]

Normalized RMS of residuals

Value

0.852792

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2020-10-11.199726

Unit

Source

[2]

Last Observation

Value

2020-10-23.257957

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (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 2020TH4 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	2014-10-27 22:15	> 1 d	0.1614406	0.0424330	0.0401212
EARTH	2016-10-21 23:00	> 1 d	0.0953438	0.0244087	0.0283489
EARTH	2018-10-16 17:07	> 1 d	0.0497019	0.0318775	0.0112902
EARTH	2020-10-11 18:59	< 1 min	0.0343618	0.0342327	0.0000430
EARTH	2022-10-08 23:03	> 1 d	0.0379670	0.0329966	0.0066949
EARTH	2024-10-02 15:34	> 1 w	0.0577370	0.0256586	0.0297112
EARTH	2026-09-21 23:30	> 1 w	0.0956141	0.0068553	0.0494223
EARTH	2028-09-06 19:09	> 1 w	0.1402280	0.0607846	0.0622408
EARTH	2030-08-24 09:59	> 1 w	0.1932092	0.1012362	0.0776844

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
12.55195283	276.78931920	0.03409728	MINIMUM
177.59344973	75.81425803	1.16147872	SADDLE
356.89635258	74.27208706	2.00787750	SADDLE
179.38577513	257.02855226	3.15494856	MAXIMUM

Download:

MOID Plots

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