Asteroids

2026ST2 help

Last update: 2026-09-22 13:00 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.722

Aphelion (Q)

1.680

Eccentricity (e)

0.399

Inclination (i)

11.6

deg

Orbit period (P)

480.8

Earth MOID

0.01047

U parameter

8.2

Next Earth close approach

Date

2040-03-20

Nominal distance (from Earth center)

0.01098

1642075

Maximum Brightness

18.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.7

mag

Diameter

30 - 70*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-20

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

1.201108

1-sigma variation

0.001225

Unit

Eccentricity (e)

Value

0.398566

1-sigma variation

0.000893

Unit

Inclination (i)

Value

11.6280

1-sigma variation

0.0266

Unit

Long. of Ascending Node (Ω)

Value

357.7916

1-sigma variation

0.0052

Unit

Arg. of Perihelion (ω)

Value

95.5068

1-sigma variation

0.0235

Unit

Mean Anomaly (M)

Value

23.61075

1-sigma variation

0.00530

Unit

Perihelion distance

Value

0.722387

1-sigma variation

Unit

Aphelion distance

Value

1.679829

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.047519

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.021744

1-sigma variation

Unit

MOID

Value

0.010473

1-sigma variation

Unit

Orbit Period

Value

480.8079

1-sigma variation

Unit

U parameter

Value

8.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.50111E-6	1.09295E-6	3.25337E-5	6.37052E-6	-2.79911E-5	6.49036E-6
e	1.09295E-6	7.97440E-7	2.37241E-5	4.64576E-6	-2.01567E-5	4.72701E-6
i	3.25337E-5	2.37241E-5	7.05930E-4	1.38236E-4	-6.01767E-4	1.40695E-4
Ω	6.37052E-6	4.64576E-6	1.38236E-4	2.70696E-5	-1.17798E-4	2.75502E-5
ω	-2.79911E-5	-2.01567E-5	-6.01767E-4	-1.17798E-4	5.51687E-4	-1.20834E-4
M	6.49036E-6	4.72701E-6	1.40695E-4	2.75502E-5	-1.20834E-4	2.80641E-5

Date of computation: 2026-09-22 13:00 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

24.651

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

30 - 70*

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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.826837

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-20.350673

Unit

Source

[2]

Last Observation

Value

2026-09-22.364509

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (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 2026ST2 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	1960-09-26 17:39	> 1 w	0.0276722	0.0200863	0.1557568
EARTH	1964-09-16 10:09	> 1 d	0.1957091	0.0136863	0.1653546
EARTH	1978-03-30 14:42	> 1 d	0.1839708	0.0876328	0.0321321
EARTH	1982-03-19 10:39	> 1 d	0.0264165	0.0089336	0.0870921
EARTH	1997-09-23 15:08	> 1 w	0.0527031	0.0199553	0.1525080
EARTH	2011-03-28 01:22	> 1 d	0.1235231	0.0119506	0.1383548
EARTH	2015-03-08 19:31	> 1 w	0.1545330	0.0245216	0.1078174
EARTH	2026-09-24 15:55	< 1 min	0.0406161	0.0403446	0.0000905
EARTH	2040-03-20 23:29	> 1 d	0.0109766	0.0108649	0.0008488
EARTH	2051-09-28 22:59	> 1 mo	0.0498093	0.0203731	3.3204766
EARTH	2065-03-30 19:31	> 1 mo	0.1813140	0.0149147	3.0963726
EARTH	2069-03-14 14:33	> 1 mo	0.0982762	0.0157982	2.4878728
EARTH	2080-09-27 10:20	> 1 w	0.0348129	0.0222980	0.2910085
EARTH	2098-03-22 16:58	> 1 mo	0.0232510	0.0115427	3.4251259
EARTH	2102-03-04 03:03	> 1 mo	0.1825092	0.0485182	0.7061198
EARTH	2113-10-06 20:28	> 1 mo	0.1614698	0.0131352	14.7478705
EARTH	2117-09-25 03:48	> 1 mo	0.0571807	0.0233122	17.3991686

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
63.89301933	76.51413276	0.01047288	MINIMUM
293.35544445	260.97387508	0.02133520	MINIMUM
358.21575408	347.94427962	0.31187176	SADDLE
179.09649149	169.75297060	0.71538097	SADDLE
359.20760300	169.46231856	1.72849835	SADDLE
179.98641376	350.35723051	2.65069850	MAXIMUM

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MOID Plots

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