Asteroids

2025SM2 help

Last update: 2025-09-24 14:14 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.826

Aphelion (Q)

2.540

Eccentricity (e)

0.509

Inclination (i)

9.9

deg

Orbit period (P)

797.5

Earth MOID

0.01668

U parameter

7.9

Next Earth close approach

Date

2039-01-29

Nominal distance (from Earth center)

0.13414

20067439

Maximum Brightness

24.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.7

mag

Diameter

12 - 28*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-19

Observatory

MAPS, San Pedro de Atacama

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

1.682994

1-sigma variation

0.001823

Unit

Eccentricity (e)

Value

0.508961

1-sigma variation

0.000602

Unit

Inclination (i)

Value

9.9089

1-sigma variation

0.0099

Unit

Long. of Ascending Node (Ω)

Value

355.9387

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

67.6594

1-sigma variation

0.0036

Unit

Mean Anomaly (M)

Value

5.97745

1-sigma variation

0.00227

Unit

Perihelion distance

Value

0.826416

1-sigma variation

Unit

Aphelion distance

Value

2.539573

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.039730

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.550143

1-sigma variation

Unit

MOID

Value

0.016680

1-sigma variation

Unit

Orbit Period

Value

797.4846

1-sigma variation

Unit

U parameter

Value

7.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.32473E-6	1.09695E-6	1.80781E-5	-1.68450E-7	-6.55393E-6	-4.14477E-6
e	1.09695E-6	3.61927E-7	5.96463E-6	-5.55812E-8	-2.16231E-6	-1.36753E-6
i	1.80781E-5	5.96463E-6	9.83047E-5	-9.15310E-7	-3.56436E-5	-2.25360E-5
Ω	-1.68450E-7	-5.55812E-8	-9.15310E-7	8.63899E-9	3.31124E-7	2.10144E-7
ω	-6.55393E-6	-2.16231E-6	-3.56436E-5	3.31124E-7	1.29415E-5	8.16666E-6
M	-4.14477E-6	-1.36753E-6	-2.25360E-5	2.10144E-7	8.16666E-6	5.16772E-6

Date of computation: 2025-09-24 14:14 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

26.664

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

12 - 28*

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

0.689097

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-19.22995

Unit

Source

[2]

Last Observation

Value

2025-09-24.264553

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

50 (4)

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 2025SM2 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	1956-01-27 07:10	> 1 d	0.1375070	0.1374813	0.0004649
EARTH	1966-09-29 19:30	> 1 mo	0.0589180	0.0119414	0.2721748
EARTH	1980-02-05 02:17	> 1 w	0.1912719	0.1351529	0.2175168
EARTH	2001-09-10 18:04	> 1 w	0.1937857	0.0081344	0.2304556
EARTH	2015-01-09 10:52	> 1 w	0.1829228	0.1313646	0.0611047
EARTH	2025-09-23 23:05	< 1 s	0.0168656	0.0168118	0.0000179
EARTH	2039-01-29 06:00	> 1 w	0.1341425	0.1332325	0.0163836
EARTH	2049-10-07 14:38	> 1 mo	0.1097297	0.0063584	0.2469177
EARTH	2084-09-13 22:38	> 1 w	0.1464533	0.0148606	0.2955185
EARTH	2098-01-19 05:44	> 1 w	0.1573807	0.1285400	0.1082987
EARTH	2108-09-27 06:38	> 1 w	0.0302291	0.0206645	0.0914831

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
321.68253518	260.50168210	0.01667973	MINIMUM
38.93680888	25.86571008	0.13359153	MINIMUM
3.92763179	329.55924950	0.21782746	SADDLE
180.26549602	141.89793332	1.54656331	SADDLE
359.29600246	141.51207481	1.83504263	SADDLE
179.29966770	321.34481142	3.51773808	MAXIMUM

Download:

MOID Plots

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