Asteroids

2026TD103 help

Last update: 2026-10-23 13:18 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.865

Aphelion (Q)

1.703

Eccentricity (e)

0.326

Inclination (i)

4.4

deg

Orbit period (P)

531.4

Earth MOID

0.00349

U parameter

6.5

Next Earth close approach

Date

2029-05-29

Nominal distance (from Earth center)

0.05844

8742778

Maximum Brightness

22.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.8

mag

Diameter

18 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-10-15

Observatory

University of Arizona Catalina Sky 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

1.283991

1-sigma variation

0.000106

Unit

Eccentricity (e)

Value

0.326292

1-sigma variation

0.000075

Unit

Inclination (i)

Value

4.4004

1-sigma variation

0.0009

Unit

Long. of Ascending Node (Ω)

Value

22.0328

1-sigma variation

3.714E-5

Unit

Arg. of Perihelion (ω)

Value

294.7196

1-sigma variation

0.0004

Unit

Mean Anomaly (M)

Value

83.32159

1-sigma variation

0.01185

Unit

Perihelion distance

Value

0.865035

1-sigma variation

Unit

Aphelion distance

Value

1.702948

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.012912

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.327569

1-sigma variation

Unit

MOID

Value

0.003486

1-sigma variation

Unit

Orbit Period

Value

531.4245

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.13168E-8	7.94943E-9	9.06040E-8	3.92570E-9	-3.96627E-8	-1.26089E-6
e	7.94943E-9	5.58431E-9	6.36346E-8	2.75702E-9	-2.79080E-8	-8.85700E-7
i	9.06040E-8	6.36346E-8	7.27831E-7	3.15768E-8	-3.17534E-7	-1.00941E-5
Ω	3.92570E-9	2.75702E-9	3.15768E-8	1.37930E-9	-1.37587E-8	-4.37353E-7
ω	-3.96627E-8	-2.79080E-8	-3.17534E-7	-1.37587E-8	1.49910E-7	4.41585E-6
M	-1.26089E-6	-8.85700E-7	-1.00941E-5	-4.37353E-7	4.41585E-6	1.40488E-4

Date of computation: 2026-10-23 13:18 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

25.839

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

18 - 40*

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

0.459742

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-10-15.308832

Unit

Source

[2]

Last Observation

Value

2026-10-21.666719

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

157 (4)

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 2026TD103 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	1953-09-08 04:39	> 1 d	0.1308920	0.1231256	0.0025910
EARTH	1956-05-24 19:55	555.6	0.0817761	0.0698666	0.0042407
EARTH	1972-09-23 15:10	> 1 d	0.0984222	0.0742126	0.0080736
EARTH	1975-05-27 19:38	1091.4	0.0624603	0.0530006	0.0052585
EARTH	1991-08-29 19:18	> 1 d	0.1461781	0.1315850	0.0048987
EARTH	1994-05-21 02:29	1090.7	0.1454680	0.1056880	0.0136504
EARTH	2007-10-24 03:25	959.1	0.1523105	0.1120665	0.0134148
EARTH	2010-07-19 13:12	> 1 d	0.1554276	0.1480600	0.0024847
EARTH	2026-10-13 07:12	< 1 min	0.0033274	0.0033253	0.0000007
EARTH	2029-05-29 07:18	279.0	0.0584419	0.0577414	0.0003672
EARTH	2042-10-13 00:19	> 1 d	0.0052743	0.0028692	0.0125163
EARTH	2055-07-12 14:14	> 1 mo	0.1546617	0.0777371	0.3328942
EARTH	2065-10-14 17:10	> 1 mo	0.0145815	0.0024241	2.0329080
EARTH	2068-05-21 11:29	> 1 mo	0.1263529	0.0596222	8.5878133
EARTH	2078-10-16 23:13	> 1 mo	0.0364156	0.0018678	50.2620780
EARTH	2081-05-25 15:24	> 1 mo	0.0818537	0.0567290	4.9396607
EARTH	2091-10-26 15:17	> 1 mo	0.1835686	0.0020932	156.2274991
EARTH	2094-06-09 16:11	> 1 mo	0.0948262	0.0581290	136.4749765
EARTH	2107-08-03 07:29	> 1 mo	0.1642259	0.1606549	12.0024383
EARTH	2120-09-17 22:55	> 1 mo	0.1186489	0.0220579	291.0486773

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
46.95976679	277.42724127	0.00348584	MINIMUM
308.81041597	145.39260772	0.05781430	MINIMUM
356.27463018	209.13897939	0.16194010	SADDLE
178.68760644	32.63470518	0.72280688	SADDLE
358.22771751	31.91324619	1.84969275	SADDLE
179.28266818	213.04870285	2.71371572	MAXIMUM

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MOID Plots

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