Asteroids

2026SY help

Last update: 2026-09-23 13:01 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

1.004

Aphelion (Q)

4.516

Eccentricity (e)

0.636

Inclination (i)

8.0

deg

Orbit period (P)

1674.6

Earth MOID

0.01041

U parameter

7.3

Next Earth close approach

Date

2095-10-01

Nominal distance (from Earth center)

0.03633

5434859

Maximum Brightness

20.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

15 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-17

Observatory

Xingming Observatory-KATS, Nanshan

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

2.759826

1-sigma variation

0.002712

Unit

Eccentricity (e)

Value

0.636267

1-sigma variation

0.000356

Unit

Inclination (i)

Value

7.9634

1-sigma variation

0.0029

Unit

Long. of Ascending Node (Ω)

Value

179.1826

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

193.2431

1-sigma variation

0.0009

Unit

Mean Anomaly (M)

Value

18.15540

1-sigma variation

0.02637

Unit

Perihelion distance

Value

1.003839

1-sigma variation

Unit

Aphelion distance

Value

4.515813

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

3.320433

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.011634

1-sigma variation

Unit

MOID

Value

0.010413

1-sigma variation

Unit

Orbit Period

Value

1674.6382

1-sigma variation

Unit

U parameter

Value

7.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.35424E-6	9.66577E-7	7.99498E-6	8.31860E-7	-2.47404E-6	-7.15107E-5
e	9.66577E-7	1.27038E-7	1.05079E-6	1.09332E-7	-3.25155E-7	-9.39875E-6
i	7.99498E-6	1.05079E-6	8.69250E-6	9.04153E-7	-2.68693E-6	-7.77415E-5
Ω	8.31860E-7	1.09332E-7	9.04153E-7	9.41522E-8	-2.80198E-7	-8.08874E-6
ω	-2.47404E-6	-3.25155E-7	-2.68693E-6	-2.80198E-7	8.49514E-7	2.40540E-5
M	-7.15107E-5	-9.39875E-6	-7.77415E-5	-8.08874E-6	2.40540E-5	6.95352E-4

Date of computation: 2026-09-23 13:01 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

26.252

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

15 - 30*

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

0.840264

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-17.80041

Unit

Source

[2]

Last Observation

Value

2026-09-21.915997

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

75 (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 2026SY 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	1980-09-02 08:58	> 1 mo	0.0864320	0.0186873	0.2452232
EARTH	2026-09-21 00:33	< 1 min	0.0142351	0.0142149	0.0000067
EARTH	2095-10-01 08:46	> 1 mo	0.0363298	0.0306651	0.0652493

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
354.58530247	258.87786676	0.01041275	MINIMUM
359.04126095	88.23269682	2.00230723	SADDLE
179.84256640	89.07032722	3.51765593	SADDLE
179.70521517	269.00601794	5.51465048	MAXIMUM

Download:

MOID Plots

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