Asteroids

2025SY help

Last update: 2025-09-26 13:16 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.966

Aphelion (Q)

1.525

Eccentricity (e)

0.224

Inclination (i)

6.9

deg

Orbit period (P)

507.9

Earth MOID

0.02938

U parameter

7.5

Next Earth close approach

Date

2050-10-28

Nominal distance (from Earth center)

0.09147

13684117

Maximum Brightness

25.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

11 - 24*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-17

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.245741

1-sigma variation

0.000497

Unit

Eccentricity (e)

Value

0.224250

1-sigma variation

0.000324

Unit

Inclination (i)

Value

6.8896

1-sigma variation

0.0090

Unit

Long. of Ascending Node (Ω)

Value

179.7935

1-sigma variation

0.0010

Unit

Arg. of Perihelion (ω)

Value

235.1504

1-sigma variation

0.0089

Unit

Mean Anomaly (M)

Value

6.17986

1-sigma variation

0.00569

Unit

Perihelion distance

Value

0.966383

1-sigma variation

Unit

Aphelion distance

Value

1.525098

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.359888

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.044680

1-sigma variation

Unit

MOID

Value

0.029380

1-sigma variation

Unit

Orbit Period

Value

507.8551

1-sigma variation

Unit

U parameter

Value

7.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.46800E-7	1.60905E-7	4.47727E-6	4.83419E-7	-4.36881E-6	2.81374E-6
e	1.60905E-7	1.04914E-7	2.91908E-6	3.15212E-7	-2.84524E-6	1.83290E-6
i	4.47727E-6	2.91908E-6	8.12247E-5	8.76994E-6	-7.92373E-5	5.10353E-5
Ω	4.83419E-7	3.15212E-7	8.76994E-6	9.47196E-7	-8.54441E-6	5.50474E-6
ω	-4.36881E-6	-2.84524E-6	-7.92373E-5	-8.54441E-6	7.83585E-5	-5.03272E-5
M	2.81374E-6	1.83290E-6	5.10353E-5	5.50474E-6	-5.03272E-5	3.23425E-5

Date of computation: 2025-09-26 13:16 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

26.977

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

11 - 24*

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

0.663195

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-17.321876

Unit

Source

[2]

Last Observation

Value

2025-09-25.50027

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

29 (3)

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

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Close Approaches for 2025SY from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1954-10-07 19:55	> 1 w	0.0415446	0.0263180	0.0881765
EARTH	1986-11-12 12:54	> 1 w	0.1064337	0.0641022	0.0287977
EARTH	1993-09-24 14:35	> 1 d	0.0946398	0.0236649	0.0903144
EARTH	2018-12-30 04:46	> 1 d	0.1463511	0.1211271	0.0145599
EARTH	2025-10-02 00:01	< 1 min	0.0312228	0.0310970	0.0000419
EARTH	2050-10-28 10:25	> 1 w	0.0914727	0.0171536	0.0619035
EARTH	2057-09-19 00:53	> 1 d	0.1836857	0.0179720	0.0958449
EARTH	2082-10-06 11:17	> 1 w	0.0365410	0.0294952	0.0299541
EARTH	2114-11-25 00:43	> 1 mo	0.1123695	0.0897775	0.1311784
EARTH	2121-09-27 14:50	> 1 w	0.0791274	0.0274060	0.3280284

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
323.44001978	269.46409558	0.02937965	MINIMUM
181.24556233	133.96588068	0.52695593	SADDLE
357.48673541	131.07022210	1.97649230	SADDLE
177.19627272	310.72119588	2.51143277	MAXIMUM

Download:

MOID Plots

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