Asteroids

2025YB4 help

Last update: 2025-12-23 17:15 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.705

Aphelion (Q)

2.676

Eccentricity (e)

0.583

Inclination (i)

4.4

deg

Orbit period (P)

802.7

Earth MOID

0.00361

U parameter

8.3

Next Earth close approach

Date

2034-08-04

Nominal distance (from Earth center)

0.19135

28625870

Maximum Brightness

29.5

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.8

mag

Diameter

5 - 10*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-12-21

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

1.690300

1-sigma variation

0.003192

Unit

Eccentricity (e)

Value

0.583059

1-sigma variation

0.000964

Unit

Inclination (i)

Value

4.3775

1-sigma variation

0.0067

Unit

Long. of Ascending Node (Ω)

Value

269.9542

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

100.5152

1-sigma variation

0.0019

Unit

Mean Anomaly (M)

Value

8.12631

1-sigma variation

0.03581

Unit

Perihelion distance

Value

0.704755

1-sigma variation

Unit

Aphelion distance

Value

2.675845

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.230131

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.024877

1-sigma variation

Unit

MOID

Value

0.003613

1-sigma variation

Unit

Orbit Period

Value

802.6831

1-sigma variation

Unit

U parameter

Value

8.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.01860E-5	3.07530E-6	2.12941E-5	-1.41514E-6	-3.26677E-6	-1.14277E-4
e	3.07530E-6	9.28542E-7	6.42793E-6	-4.27295E-7	-9.99633E-7	-3.45011E-5
i	2.12941E-5	6.42793E-6	4.45464E-5	-2.95911E-6	-6.61419E-6	-2.38909E-4
Ω	-1.41514E-6	-4.27295E-7	-2.95911E-6	1.97000E-7	4.62251E-7	1.58760E-5
ω	-3.26677E-6	-9.99633E-7	-6.61419E-6	4.62251E-7	3.76301E-6	3.65031E-5
M	-1.14277E-4	-3.45011E-5	-2.38909E-4	1.58760E-5	3.65031E-5	1.28208E-3

Date of computation: 2025-12-23 17:15 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

28.818

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

5 - 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

0.785635

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-21.253053

Unit

Source

[2]

Last Observation

Value

2025-12-23.351354

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

17 (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 2025YB4 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	1990-08-01 06:34	> 1 mo	0.1814982	0.0179405	0.1921417
EARTH	2001-07-12 18:22	1207.9	0.0288605	0.0257894	0.0070436
EARTH	2003-12-28 22:30	> 1 d	0.1629593	0.0774810	0.0284956
EARTH	2012-07-06 07:21	> 1 w	0.0891098	0.0256693	0.1621645
MARS	2014-07-28 21:23	> 1 w	0.0389482	0.0091100	0.1444931
EARTH	2014-12-23 08:05	> 1 w	0.0630182	0.0037275	0.1908678
EARTH	2023-07-03 15:47	> 1 d	0.1502031	0.0439583	0.0368210
EARTH	2025-12-19 15:04	< 1 min	0.0061670	0.0061394	0.0000092
EARTH	2034-08-04 16:46	> 1 w	0.1913521	0.0192417	0.1223870
EARTH	2054-07-03 09:19	> 1 w	0.1686902	0.0275123	0.4000406
EARTH	2056-12-25 15:24	> 1 w	0.1040611	0.0017827	0.4265366
EARTH	2085-07-12 19:55	> 1 d	0.0305171	0.0296524	0.0141846
MARS	2089-10-26 18:13	> 1 w	0.0219559	0.0028569	0.1835775
EARTH	2107-12-07 08:13	> 1 mo	0.1452927	0.0050143	0.5177059
EARTH	2116-07-15 12:17	> 1 mo	0.0354554	0.0306331	0.2899343

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
44.26869889	346.20959700	0.00361339	MINIMUM
312.75708423	188.38059466	0.02631232	MINIMUM
357.83076519	266.36495905	0.30335084	SADDLE
179.43725479	88.53258878	1.67998791	SADDLE
358.00697938	86.70681350	1.70366046	SADDLE
179.50485693	268.56705389	3.67483249	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2025YB4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2111-12-21.785	92440.785	-1.387	0.000	1.17 ± 0.009	2.53E5	3.93E-7	1.45E-2	-8.29
2112-12-20.910	92805.910	-0.247	0.000	1.05 ± 0.007	1.49E7	3.12E-8	1.46E-2	-9.39
2112-12-20.917	92805.917	1.204	0.000	1.11 ± 0.006	2.86E6	8.67E-8	1.48E-2	-8.94
2116-12-20.912	94266.912	0.808	0.000	0.91 ± 0.004	1.36E6	4.96E-7	1.47E-2	-8.21
2116-12-20.935	94266.935	1.034	0.000	0.09 ± 0.008	1.31E5	4.32E-6	1.48E-2	-7.27
2116-12-20.955	94266.955	0.806	0.000	0.14 ± 0.006	4.24E6	1.63E-7	1.48E-2	-8.69
2116-12-20.972	94266.972	1.052	0.000	0.83 ± 0.009	1.16E6	4.40E-7	1.48E-2	-8.26
2119-12-21.492	95362.492	3.340	0.000	1.03 ± 0.008	1.12E5	1.68E-8	1.50E-2	-9.69
2119-12-21.598	95362.598	1.186	0.000	0.66 ± 0.008	2.89E6	1.39E-7	1.48E-2	-8.77
2119-12-21.669	95362.669	-2.527	0.000	0.04 ± 0.010	9.56E6	4.15E-9	1.44E-2	-10.31
2119-12-21.709	95362.709	-3.767	0.000	1.16 ± 0.010	2.07E6	1.24E-10	1.43E-2	-11.83
2120-12-20.915	95727.915	-1.376	0.000	0.91 ± 0.009	9.28E6	2.97E-8	1.45E-2	-9.45
2120-12-20.934	95727.934	1.149	0.000	0.79 ± 0.009	2.22E6	2.23E-7	1.48E-2	-8.57
2121-12-21.076	96093.076	2.671	0.546	1.21 ± 0.007	2.64E4	2.32E-8	1.49E-2	-9.56
2121-12-21.101	96093.101	2.623	0.000	0.13 ± 0.009	2.66E4	1.16E-6	1.49E-2	-7.86
2121-12-21.149	96093.149	1.198	0.000	0.85 ± 0.000	4.48E7	1.05E-8	1.48E-2	-9.90
2122-12-21.352	96458.352	-1.861	0.000	0.50 ± 0.003	5.71E6	2.73E-8	1.45E-2	-9.50
2122-12-21.448	96458.448	-1.775	0.000	0.73 ± 0.006	2.04E4	9.79E-6	1.45E-2	-6.94
2122-12-21.466	96458.466	-1.613	0.000	0.23 ± 0.001	1.75E3	1.49E-4	1.45E-2	-5.76
2122-12-21.477	96458.477	-1.564	0.000	0.65 ± 0.018	1.06E3	2.27E-4	1.45E-2	-5.58


Based on 17 optical observations (of which 2 are rejected as outliers) from 2025/12/21.253 to 2025/12/23.351.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.21 and 1.21 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251223 172150.914 UTC.

Download this part as:

Download Impactor Table as: