Asteroids

2025ST4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.879

Aphelion (Q)

2.339

Eccentricity (e)

0.454

Inclination (i)

6.5

deg

Orbit period (P)

745.2

Earth MOID

0.00040

U parameter

7.2

Next Earth close approach

Date

2070-05-23

Nominal distance (from Earth center)

0.14847

22210959

Maximum Brightness

27.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.9

mag

Diameter

4 - 10*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-23

Observatory

Mt. Lemmon Survey

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

1.608614

1-sigma variation

0.000560

Unit

Eccentricity (e)

Value

0.453872

1-sigma variation

0.000217

Unit

Inclination (i)

Value

6.4964

1-sigma variation

0.0023

Unit

Long. of Ascending Node (Ω)

Value

179.9732

1-sigma variation

4.847E-5

Unit

Arg. of Perihelion (ω)

Value

126.6245

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

48.08768

1-sigma variation

0.02718

Unit

Perihelion distance

Value

0.878509

1-sigma variation

Unit

Aphelion distance

Value

2.338719

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.754256

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.001148

1-sigma variation

Unit

MOID

Value

0.000401

1-sigma variation

Unit

Orbit Period

Value

745.2058

1-sigma variation

Unit

U parameter

Value

7.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.13573E-7	1.21518E-7	1.29559E-6	2.25687E-8	-2.62776E-7	-1.52200E-5
e	1.21518E-7	4.70915E-8	5.02086E-7	8.74530E-9	-1.01910E-7	-5.89812E-6
i	1.29559E-6	5.02086E-7	5.37476E-6	8.95534E-8	-1.09556E-6	-6.28786E-5
Ω	2.25687E-8	8.74530E-9	8.95534E-8	2.34956E-9	-1.75323E-8	-1.09643E-6
ω	-2.62776E-7	-1.01910E-7	-1.09556E-6	-1.75323E-8	2.47643E-7	1.27460E-5
M	-1.52200E-5	-5.89812E-6	-6.28786E-5	-1.09643E-6	1.27460E-5	7.38741E-4

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

28.893

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

4 - 10*

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

0.610849

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-23.376575

Unit

Source

[2]

Last Observation

Value

2025-09-24.38585

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

27 (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

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 2025ST4 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	1963-07-03 15:57	> 1 w	0.1402962	0.1047625	0.0225760
EARTH	1978-06-03 22:04	> 1 d	0.0883541	0.0880683	0.0018880
EARTH	1993-05-22 06:31	700.9	0.1644964	0.1468423	0.0060326
EARTH	2010-09-29 15:06	> 1 d	0.0700609	0.0004409	0.0420337
EARTH	2025-09-22 19:49	< 1 min	0.0005813	0.0005806	0.0000002
EARTH	2070-05-26 02:31	> 1 w	0.1273350	0.1094548	0.0623348
EARTH	2072-07-10 15:02	> 1 mo	0.1610220	0.1474521	0.0194324
EARTH	2074-09-11 11:08	> 1 w	0.0768437	0.0077493	0.1098005
MARS	2076-04-07 17:06	> 1 d	0.0190832	0.0086826	0.0830118
EARTH	2076-10-05 06:44	> 1 w	0.1540426	0.0055928	0.1209546
EARTH	2121-05-20 06:43	> 1 mo	0.1985787	0.1098207	0.4991984
EARTH	2123-06-14 05:00	> 1 mo	0.1269277	0.1115032	0.2383373
EARTH	2125-08-14 06:48	> 1 mo	0.1488620	0.0823943	0.2156086

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
34.11465423	259.45637285	0.00040071	MINIMUM
323.24993931	147.73159798	0.10860765	MINIMUM
354.63013041	197.02782348	0.16554744	SADDLE
179.16047176	24.77475424	1.36092271	SADDLE
358.75680371	23.88528219	1.86162776	SADDLE
179.84960616	205.18943935	3.35256879	MAXIMUM

Download:

MOID Plots

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