Asteroids

2026TH1 help

Last update: 2026-10-06 13:16 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Amor

Perihelion (q)

1.031

Aphelion (Q)

3.915

Eccentricity (e)

0.583

Inclination (i)

0.3

deg

Orbit period (P)

1420.5

Earth MOID

0.03220

U parameter

7.7

Next Earth close approach

Date

2057-08-26

Nominal distance (from Earth center)

0.13507

20205845

Maximum Brightness

25.8

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

27.7

mag

Diameter

8 - 17*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-10-04

Observatory

University of Arizona 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

61400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.472981

1-sigma variation

0.003566

Unit

Eccentricity (e)

Value

0.583184

1-sigma variation

0.000590

Unit

Inclination (i)

Value

0.2596

1-sigma variation

0.0003

Unit

Long. of Ascending Node (Ω)

Value

245.0889

1-sigma variation

0.0403

Unit

Arg. of Perihelion (ω)

Value

129.4358

1-sigma variation

0.0440

Unit

Mean Anomaly (M)

Value

20.07907

1-sigma variation

0.04300

Unit

Perihelion distance

Value

1.030779

1-sigma variation

Unit

Aphelion distance

Value

3.915184

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.549025

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.211158

1-sigma variation

Unit

MOID

Value

0.032203

1-sigma variation

Unit

Orbit Period

Value

1420.4623

1-sigma variation

Unit

U parameter

Value

7.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.27194E-5	2.10360E-6	7.79673E-7	5.93904E-6	-1.22197E-5	-1.53323E-4
e	2.10360E-6	3.47906E-7	1.29037E-7	9.53565E-7	-1.98857E-6	-2.53581E-5
i	7.79673E-7	1.29037E-7	6.44234E-8	-4.82493E-6	4.89167E-6	-9.49479E-6
Ω	5.93904E-6	9.53565E-7	-4.82493E-6	1.62274E-3	-1.76754E-3	-4.13066E-5
ω	-1.22197E-5	-1.98857E-6	4.89167E-6	-1.76754E-3	1.93387E-3	1.13078E-4
M	-1.53323E-4	-2.53581E-5	-9.49479E-6	-4.13066E-5	1.13078E-4	1.84903E-3

Date of computation: 2026-10-06 13:16 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

27.736

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

8 - 17*

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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.53421

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-10-04.198537

Unit

Source

[2]

Last Observation

Value

2026-10-05.982014

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

[-]

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2026TH1 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1960-11-07 22:28	> 1 mo	0.1032124	0.0036561	0.7929218
EARTH	2026-10-05 21:52	1.6	0.0312380	0.0311541	0.0000280
EARTH	2057-08-26 18:36	> 1 mo	0.1350677	0.0053369	0.3746289
EARTH	2080-09-29 09:33	> 1 mo	0.0172761	0.0056768	0.0347375
EARTH	2103-11-01 15:17	> 1 mo	0.0207643	0.0017746	1.2548574

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
358.79877454	270.10683728	0.03220333	MINIMUM
358.77334691	90.05731962	2.03001618	SADDLE
179.67680177	91.16997886	2.91579811	SADDLE
179.67744562	271.17045940	4.91381698	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2026TH1

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2099-10-26.017	88002.017	0.464	0.000	1.17 ± 0.068	5.78E5	1.62E-6	3.35E-2	-7.32	0


Based on 20 optical observations (of which 0 are rejected as outliers) from 2026/10/04.199 to 2026/10/05.982.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.62 and 1.62 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20261006 140526.260 UTC.

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Download Impactor Table as: