Asteroids

2026SY2 help

Last update: 2026-09-21 11:45 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.459

Aphelion (Q)

4.006

Eccentricity (e)

0.794

Inclination (i)

3.2

deg

Orbit period (P)

1218.5

Earth MOID

0.00618

U parameter

8.6

Next Earth close approach

Date

2030-04-20

Nominal distance (from Earth center)

0.13202

19749824

Maximum Brightness

26.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.5

mag

Diameter

8 - 19*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-19

Observatory

GINOP-KHK, Piszkesteto

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

2.232615

1-sigma variation

0.010975

Unit

Eccentricity (e)

Value

0.794363

1-sigma variation

0.001220

Unit

Inclination (i)

Value

3.2293

1-sigma variation

0.0049

Unit

Long. of Ascending Node (Ω)

Value

184.4568

1-sigma variation

0.0024

Unit

Arg. of Perihelion (ω)

Value

276.7380

1-sigma variation

0.0024

Unit

Mean Anomaly (M)

Value

14.90424

1-sigma variation

0.09636

Unit

Perihelion distance

Value

0.459109

1-sigma variation

Unit

Aphelion distance

Value

4.006122

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.242540

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.093398

1-sigma variation

Unit

MOID

Value

0.006183

1-sigma variation

Unit

Orbit Period

Value

1218.4825

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.20448E-4	1.33885E-5	5.29027E-5	1.97217E-5	-1.83256E-5	-1.05753E-3
e	1.33885E-5	1.48820E-6	5.88080E-6	2.19122E-6	-2.03579E-6	-1.17550E-4
i	5.29027E-5	5.88080E-6	2.36578E-5	7.60261E-6	-6.91119E-6	-4.64475E-4
Ω	1.97217E-5	2.19122E-6	7.60261E-6	5.88869E-6	-5.85315E-6	-1.73176E-4
ω	-1.83256E-5	-2.03579E-6	-6.91119E-6	-5.85315E-6	5.89090E-6	1.60922E-4
M	-1.05753E-3	-1.17550E-4	-4.64475E-4	-1.73176E-4	1.60922E-4	9.28510E-3

Date of computation: 2026-09-21 11:45 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

27.521

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

8 - 19*

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

0.9

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.7801

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-19.934434

Unit

Source

[2]

Last Observation

Value

2026-09-20.868284

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

35 (2)

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 2026SY2 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	1950-04-14 07:51	> 1 mo	0.0141232	0.0107359	0.7786144
EARTH	1956-09-11 20:37	> 1 mo	0.1393783	0.0167907	1.3565624
EARTH	1960-04-07 11:25	> 1 mo	0.1292013	0.0115082	1.4246215
EARTH	1966-09-10 15:52	> 1 mo	0.1862308	0.0158428	1.1576496
EARTH	1970-04-09 04:23	> 1 mo	0.0962601	0.0114155	1.0235007
VENUS	1973-07-20 04:26	> 1 mo	0.0490797	0.0475883	0.2193326
EARTH	2000-04-04 11:16	> 1 d	0.1718939	0.0155005	0.0657562
EARTH	2010-04-12 10:44	> 1 w	0.0356657	0.0178886	0.2625856
EARTH	2016-09-16 08:33	> 1 w	0.0911452	0.0063677	0.3273914
EARTH	2020-04-15 08:00	> 1 w	0.0319040	0.0183802	0.2523989
EARTH	2026-09-21 11:24	< 1 min	0.0062520	0.0062188	0.0000111
EARTH	2030-04-20 22:17	> 1 w	0.1320194	0.0192876	0.1479897
EARTH	2036-09-24 10:41	> 1 w	0.0733940	0.0032337	0.4581378
EARTH	2040-04-21 18:15	> 1 w	0.1391517	0.0239882	0.4785080
EARTH	2046-09-21 10:10	> 1 w	0.0035091	0.0021280	0.4020295
EARTH	2050-04-09 10:09	> 1 mo	0.1156609	0.0233427	8.8027109
EARTH	2073-04-24 01:11	> 1 mo	0.1717756	0.0292106	49.1975578
VENUS	2099-08-29 22:16	> 1 mo	0.0410827	0.0333608	21.2148554
EARTH	2102-10-04 08:50	> 1 mo	0.1990731	0.0044226	35.4431966
EARTH	2106-04-19 18:45	> 1 mo	0.0618623	0.0333570	32.9410580
VENUS	2116-01-04 08:39	> 1 mo	0.0495000	0.0141497	37.1399796

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
313.91450694	256.15837277	0.00618348	MINIMUM
46.00178187	100.17047762	0.01889393	MINIMUM
359.92061332	358.07843998	0.52554649	SADDLE
359.93907686	178.13323911	1.47358750	SADDLE
179.98914217	178.23717193	2.99327227	SADDLE
179.99793032	358.24038490	4.98819763	MAXIMUM

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MOID Plots

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