Asteroids

2026TJ4 help

Last update: 2026-10-08 14:46 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.919

Aphelion (Q)

1.547

Eccentricity (e)

0.255

Inclination (i)

30.5

deg

Orbit period (P)

500.1

Earth MOID

0.01548

U parameter

8.4

Next Earth close approach

Date

2026-10-09

Nominal distance (from Earth center)

0.01536

2297801

Maximum Brightness

17.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.4

mag

Diameter

22 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-10-06

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

61400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.232961

1-sigma variation

0.001644

Unit

Eccentricity (e)

Value

0.254515

1-sigma variation

0.000912

Unit

Inclination (i)

Value

30.4881

1-sigma variation

0.0568

Unit

Long. of Ascending Node (Ω)

Value

15.3102

1-sigma variation

0.0007

Unit

Arg. of Perihelion (ω)

Value

57.5711

1-sigma variation

0.1138

Unit

Mean Anomaly (M)

Value

20.98991

1-sigma variation

0.03738

Unit

Perihelion distance

Value

0.919154

1-sigma variation

Unit

Aphelion distance

Value

1.546767

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.016395

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.335772

1-sigma variation

Unit

MOID

Value

0.015483

1-sigma variation

Unit

Orbit Period

Value

500.0602

1-sigma variation

Unit

U parameter

Value

8.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.70253E-6	1.49914E-6	9.34437E-5	1.16301E-6	-1.87079E-4	6.14202E-5
e	1.49914E-6	8.31666E-7	5.18376E-5	6.44958E-7	-1.03758E-4	3.40632E-5
i	9.34437E-5	5.18376E-5	3.23107E-3	4.02051E-5	-6.46776E-3	2.12337E-3
Ω	1.16301E-6	6.44958E-7	4.02051E-5	5.01083E-7	-8.05621E-5	2.64552E-5
ω	-1.87079E-4	-1.03758E-4	-6.46776E-3	-8.05621E-5	1.29556E-2	-4.25404E-3
M	6.14202E-5	3.40632E-5	2.12337E-3	2.64552E-5	-4.25404E-3	1.39690E-3

Date of computation: 2026-10-08 14:46 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

25.384

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

22 - 50*

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

0.9

Unit

Source

[1]

Normalized RMS of residuals

Value

0.38494

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-10-06.564941

Unit

Source

[2]

Last Observation

Value

2026-10-07.994522

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

16 (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 2026TJ4 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	1952-10-16 09:57	> 1 w	0.1935562	0.0065309	0.2240813
EARTH	1963-10-07 22:16	> 1 w	0.0407778	0.0141192	0.2911119
EARTH	1989-10-10 20:43	> 1 w	0.0460359	0.0140995	0.3855017
EARTH	2000-09-30 12:57	> 1 w	0.1970185	0.0066602	0.3060697
EARTH	2026-10-09 05:23	< 1 min	0.0153599	0.0152648	0.0000317
EARTH	2052-10-11 14:18	> 1 w	0.0656738	0.0138260	0.3021856
EARTH	2063-10-01 11:15	> 1 w	0.1966833	0.0071481	0.2642377
EARTH	2089-10-07 06:41	> 1 d	0.0515400	0.0141630	0.0848596
EARTH	2115-10-10 15:37	> 1 w	0.0160289	0.0148861	0.1054624

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
314.56883364	273.73076072	0.01548318	MINIMUM
92.51914809	78.40350084	0.29178968	MINIMUM
27.31274152	5.22440955	0.50970944	SADDLE
204.08920298	166.34086919	0.80958533	SADDLE
9.88815313	160.26212272	1.87812377	SADDLE
166.20068313	314.56233113	2.48242986	MAXIMUM

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MOID Plots

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