Asteroids

2026SO help

Last update: 2026-09-19 03:15 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.948

Aphelion (Q)

3.571

Eccentricity (e)

0.580

Inclination (i)

3.6

deg

Orbit period (P)

1240.5

Earth MOID

0.00986

U parameter

8.6

Next Earth close approach

Date

2043-09-15

Nominal distance (from Earth center)

0.018

2692558

Maximum Brightness

18.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

17 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-18

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

2.259454

1-sigma variation

0.010885

Unit

Eccentricity (e)

Value

0.580371

1-sigma variation

0.002107

Unit

Inclination (i)

Value

3.5914

1-sigma variation

0.0095

Unit

Long. of Ascending Node (Ω)

Value

357.2829

1-sigma variation

0.0017

Unit

Arg. of Perihelion (ω)

Value

318.2410

1-sigma variation

0.0428

Unit

Mean Anomaly (M)

Value

37.76704

1-sigma variation

0.27617

Unit

Perihelion distance

Value

0.948133

1-sigma variation

Unit

Aphelion distance

Value

3.570774

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.042325

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.648843

1-sigma variation

Unit

MOID

Value

0.009860

1-sigma variation

Unit

Orbit Period

Value

1240.5196

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.18479E-4	2.29195E-5	9.35196E-5	1.73428E-5	-1.93239E-4	-3.00508E-3
e	2.29195E-5	4.44115E-6	1.77491E-5	3.39250E-6	-4.07411E-5	-5.80730E-4
i	9.35196E-5	1.77491E-5	8.96256E-5	1.19389E-5	2.27106E-6	-2.39942E-3
Ω	1.73428E-5	3.39250E-6	1.19389E-5	2.73888E-6	-4.52967E-5	-4.36869E-4
ω	-1.93239E-4	-4.07411E-5	2.27106E-6	-4.52967E-5	1.83551E-3	4.63201E-3
M	-3.00508E-3	-5.80730E-4	-2.39942E-3	-4.36869E-4	4.63201E-3	7.62679E-2

Date of computation: 2026-09-19 03:15 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

26.008

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

17 - 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

0.7

Unit

Source

[1]

Unobserved

Value

0.8

Unit

Source

[1]

Normalized RMS of residuals

Value

0.525423

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-18.277482

Unit

Source

[2]

Last Observation

Value

2026-09-19.004288

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

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:

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Time step:*

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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 2026SO 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	1965-09-20 11:23	> 1 mo	0.0937525	0.0131143	0.3800198
EARTH	1982-08-23 01:00	> 1 mo	0.0546744	0.0045181	0.6724654
EARTH	1999-06-24 15:23	> 1 mo	0.0838738	0.0617860	0.7044063
EARTH	2026-09-13 23:19	6.8	0.0147206	0.0145694	0.0000504
EARTH	2043-09-15 15:23	> 1 mo	0.0179986	0.0081302	0.5992996
EARTH	2067-06-13 10:27	> 1 mo	0.1927617	0.0658163	14.3258068
EARTH	2084-08-17 20:31	> 1 mo	0.0698943	0.0197619	6.7473282
EARTH	2125-08-24 05:33	> 1 mo	0.0614040	0.0103760	2.1304506

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
17.38291224	246.45884950	0.00986012	MINIMUM
342.56050873	179.43519743	0.06162323	MINIMUM
356.79044531	206.83335320	0.07790147	SADDLE
359.22505781	31.61113341	1.93339022	SADDLE
179.75205923	32.35720619	2.58621799	SADDLE
179.84121529	212.39932995	4.58254830	MAXIMUM

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MOID Plots

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