Asteroids

2025BS4 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.722

Aphelion (Q)

2.665

Eccentricity (e)

0.574

Inclination (i)

1.6

deg

Orbit period (P)

805.1

Earth MOID

0.00048

U parameter

7.3

Next Earth close approach

Date

2036-02-14

Nominal distance (from Earth center)

0.14712

22008960

Maximum Brightness

28.5

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.5

mag

Diameter

5 - 12*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-01-23

Observatory

Kitt Peak-Bok

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

1.693631

1-sigma variation

0.000771

Unit

Eccentricity (e)

Value

0.573581

1-sigma variation

0.000234

Unit

Inclination (i)

Value

1.6364

1-sigma variation

0.0006

Unit

Long. of Ascending Node (Ω)

Value

127.5483

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

75.4099

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

112.02092

1-sigma variation

0.07347

Unit

Perihelion distance

Value

0.722197

1-sigma variation

Unit

Aphelion distance

Value

2.665065

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.008358

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.310872

1-sigma variation

Unit

MOID

Value

0.000483

1-sigma variation

Unit

Orbit Period

Value

805.0570

1-sigma variation

Unit

U parameter

Value

7.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.94452E-7	1.80553E-7	4.57558E-7	6.79265E-8	-2.30936E-9	-5.66468E-5
e	1.80553E-7	5.48409E-8	1.38978E-7	2.06288E-8	-3.09584E-10	-1.72053E-5
i	4.57558E-7	1.38978E-7	3.54136E-7	5.17675E-8	-1.94313E-10	-4.36019E-5
Ω	6.79265E-8	2.06288E-8	5.17675E-8	8.01339E-9	-1.04755E-9	-6.47284E-6
ω	-2.30936E-9	-3.09584E-10	-1.94313E-10	-1.04755E-9	8.82651E-8	2.12366E-7
M	-5.66468E-5	-1.72053E-5	-4.36019E-5	-6.47284E-6	2.12366E-7	5.39801E-3

Date of computation: 2025-09-10 00:30 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

28.486

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

5 - 12*

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

Unit

Source

[1]

Unobserved

Value

293

Unit

Source

[1]

Normalized RMS of residuals

Value

0.700156

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-01-23.470622

Unit

Source

[2]

Last Observation

Value

2025-01-27.404421

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

22 (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

Close Approaches for 2025BS4 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
VENUS	1971-09-11 05:18	> 1 w	0.0467503	0.0212772	0.0463205
EARTH	1976-01-22 17:26	> 1 d	0.0919297	0.0003144	0.0409925
EARTH	1987-06-08 07:34	> 1 d	0.1837275	0.1141061	0.0232292
EARTH	2007-07-09 01:49	> 1 d	0.0980954	0.0131854	0.0618692
EARTH	2025-01-28 04:35	< 1 s	0.0054932	0.0054868	0.0000021
EARTH	2036-02-14 12:28	> 1 w	0.1471208	0.0266104	0.0401879
VENUS	2040-08-22 02:44	> 1 w	0.0139842	0.0007000	0.0147205
VENUS	2082-07-10 20:27	> 1 d	0.0434225	0.0038613	0.0322344
EARTH	2113-06-28 15:07	> 1 d	0.0793814	0.0146263	0.0321486
EARTH	2124-07-08 10:41	655.6	0.0514048	0.0314750	0.0066839

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
316.82883434	25.85373918	0.00053938	MINIMUM
45.82778845	178.87557075	0.01285070	MINIMUM
1.85799694	103.03249572	0.28187074	SADDLE
180.49934086	281.33265194	1.66921073	SADDLE
1.80431523	282.93813521	1.71867382	SADDLE
180.48906451	101.32951388	3.66801798	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2025BS4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2067-01-29.475	76044.475	3.533	0.83 ± 0.005	1.18E4	1.20E-7	2.84E-2	-8.27
2076-01-29.716	79331.716	3.527	0.84 ± 0.005	4.79E6	2.95E-10	2.84E-2	-10.96
2100-01-30.188	88098.188	0.368	1.19 ± 0.005	6.24E4	5.82E-6	2.82E-2	-6.83
2109-01-30.460	91385.460	0.370	0.29 ± 0.005	1.42E7	6.23E-8	2.83E-2	-8.85
2109-01-30.480	91385.480	0.378	0.66 ± 0.002	3.42E6	2.24E-7	2.82E-2	-8.30


Based on 22 optical observations (of which 0 are rejected as outliers) from 2025/01/23.471 to 2025/01/27.404.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.22 and 1.22 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: