Asteroids

2025SM15 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.906

Aphelion (Q)

2.554

Eccentricity (e)

0.476

Inclination (i)

4.2

deg

Orbit period (P)

830.9

Earth MOID

0.00642

U parameter

8.2

Next Earth close approach

Date

2050-11-24

Nominal distance (from Earth center)

0.09721

14542655

Maximum Brightness

29.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.3

mag

Diameter

9 - 20*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-27

Observatory

Altay Astronomical Observatory

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.729686

1-sigma variation

0.002834

Unit

Eccentricity (e)

Value

0.476430

1-sigma variation

0.000919

Unit

Inclination (i)

Value

4.2477

1-sigma variation

0.0065

Unit

Long. of Ascending Node (Ω)

Value

191.6587

1-sigma variation

0.0013

Unit

Arg. of Perihelion (ω)

Value

230.0335

1-sigma variation

0.0030

Unit

Mean Anomaly (M)

Value

90.34348

1-sigma variation

0.21469

Unit

Perihelion distance

Value

0.905611

1-sigma variation

Unit

Aphelion distance

Value

2.553761

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.928247

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.022899

1-sigma variation

Unit

MOID

Value

0.006424

1-sigma variation

Unit

Orbit Period

Value

830.9011

1-sigma variation

Unit

U parameter

Value

8.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.03187E-6	2.60432E-6	1.84361E-5	3.60965E-6	-8.28391E-6	-6.08452E-4
e	2.60432E-6	8.44448E-7	5.97789E-6	1.17043E-6	-2.68553E-6	-1.97290E-4
i	1.84361E-5	5.97789E-6	4.23184E-5	8.28527E-6	-1.90086E-5	-1.39662E-3
Ω	3.60965E-6	1.17043E-6	8.28527E-6	1.62268E-6	-3.72173E-6	-2.73449E-4
ω	-8.28391E-6	-2.68553E-6	-1.90086E-5	-3.72173E-6	8.71721E-6	6.27502E-4
M	-6.08452E-4	-1.97290E-4	-1.39662E-3	-2.73449E-4	6.27502E-4	4.60931E-2

Date of computation: 2026-03-17 23:26 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

27.339

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

9 - 20*

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

196

Unit

Source

[1]

Normalized RMS of residuals

Value

0.516232

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-27.87291

Unit

Source

[2]

Last Observation

Value

2025-10-05.324604

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

25 (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

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 2025SM15 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	1956-10-24 09:19	> 1 mo	0.0603081	0.0023044	44.4920201
EARTH	1980-01-15 12:38	> 1 mo	0.1409957	0.0745707	9.9152917
EARTH	1986-10-05 02:35	> 1 mo	0.0356094	0.0055480	6.6651733
EARTH	2009-10-08 09:03	> 1 mo	0.0123132	0.0064841	0.1836582
EARTH	2025-10-07 03:19	< 1 min	0.0205504	0.0204436	0.0000356
EARTH	2050-11-24 07:17	> 1 mo	0.0972116	0.0928932	0.0248263
EARTH	2076-01-10 01:50	> 1 mo	0.0834318	0.0728149	0.1978737
EARTH	2091-10-11 19:55	> 1 mo	0.0088037	0.0082513	0.1461499
EARTH	2107-09-28 15:11	> 1 mo	0.1297628	0.0041854	35.1036956

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
332.18359207	276.21055074	0.00656945	MINIMUM
24.68593536	0.74525623	0.07279298	MINIMUM
2.26908910	324.76392361	0.09829237	SADDLE
179.72195328	139.90863105	1.54299769	SADDLE
358.81038371	139.05771225	1.91891287	SADDLE
179.46355094	319.76056303	3.54076127	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out