Asteroids

2025YW4 help

Last update: 2025-12-28 13:16 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.861

Aphelion (Q)

1.193

Eccentricity (e)

0.162

Inclination (i)

10.3

deg

Orbit period (P)

380.1

Earth MOID

0.00083

U parameter

6.0

Next Earth close approach

Date

2026-12-24

Nominal distance (from Earth center)

0.18021

26958992

Maximum Brightness

24.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

25.5

mag

Diameter

21 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-12-22

Observatory

Catalina Sky 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

1.026995

1-sigma variation

0.000031

Unit

Eccentricity (e)

Value

0.161742

1-sigma variation

0.000058

Unit

Inclination (i)

Value

10.2661

1-sigma variation

0.0036

Unit

Long. of Ascending Node (Ω)

Value

276.9814

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

263.3591

1-sigma variation

0.0019

Unit

Mean Anomaly (M)

Value

259.28275

1-sigma variation

0.00972

Unit

Perihelion distance

Value

0.860887

1-sigma variation

Unit

Aphelion distance

Value

1.193103

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.001131

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.001873

1-sigma variation

Unit

MOID

Value

0.000831

1-sigma variation

Unit

Orbit Period

Value

380.1465

1-sigma variation

Unit

U parameter

Value

6.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.75151E-10	1.81009E-9	1.12704E-7	3.54014E-9	-5.86728E-8	3.03462E-7
e	1.81009E-9	3.36151E-9	2.09318E-7	6.56976E-9	-1.08654E-7	5.63232E-7
i	1.12704E-7	2.09318E-7	1.30345E-5	4.09015E-7	-6.76281E-6	3.50688E-5
Ω	3.54014E-9	6.56976E-9	4.09015E-7	1.28706E-8	-2.13250E-7	1.10172E-6
ω	-5.86728E-8	-1.08654E-7	-6.76281E-6	-2.13250E-7	3.57080E-6	-1.82677E-5
M	3.03462E-7	5.63232E-7	3.50688E-5	1.10172E-6	-1.82677E-5	9.44377E-5

Date of computation: 2025-12-28 13:16 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

25.49

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

21 - 50*

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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.569917

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-22.354759

Unit

Source

[2]

Last Observation

Value

2025-12-28.215336

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

59 (1)

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 2025YW4 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	1950-06-27 22:03	> 1 d	0.0180825	0.0024875	0.0411180
EARTH	1973-12-22 10:37	563.3	0.1309798	0.1041568	0.0089417
EARTH	1975-01-03 05:04	574.4	0.1131253	0.0803057	0.0109592
EARTH	1976-07-02 14:23	> 1 d	0.1756700	0.1401055	0.0118957
EARTH	1977-06-30 20:20	805.9	0.0615640	0.0204675	0.0137140
EARTH	1999-12-22 16:46	280.1	0.1421227	0.1284159	0.0045690
EARTH	2001-01-02 06:30	237.8	0.1097170	0.0937716	0.0053178
EARTH	2002-06-29 17:29	737.1	0.1694118	0.1517581	0.0058885
EARTH	2003-07-01 20:16	369.5	0.0754130	0.0561940	0.0064070
EARTH	2025-12-28 05:54	< 1 s	0.0073522	0.0073445	0.0000026
EARTH	2026-12-24 19:40	38.8	0.1802097	0.1792045	0.0003351
EARTH	2028-05-26 02:06	267.5	0.1827962	0.1814754	0.0004408
EARTH	2029-06-30 02:43	58.2	0.0084945	0.0076271	0.0004117
EARTH	2030-07-08 00:20	271.4	0.1575576	0.1432105	0.0047836
EARTH	2063-12-24 02:19	> 1 d	0.0913456	0.0058407	0.1336477
EARTH	2064-12-30 09:24	> 1 d	0.0675438	0.0064619	0.1272022
EARTH	2067-06-05 21:00	> 1 w	0.1725193	0.0710213	0.0710663
EARTH	2068-06-29 05:13	> 1 d	0.0175145	0.0092596	0.0474416
EARTH	2069-07-05 23:23	901.2	0.1208673	0.1068699	0.0048229
EARTH	2107-12-20 08:10	> 1 mo	0.1735299	0.0117533	2.1116450
EARTH	2108-12-25 22:58	> 1 mo	0.0345320	0.0084880	2.0482705
EARTH	2110-01-01 15:34	> 1 mo	0.0916629	0.0115859	1.2074789
EARTH	2113-06-24 22:12	> 1 mo	0.1062504	0.0050126	1.8866947
EARTH	2114-07-02 12:35	> 1 mo	0.0189397	0.0106410	2.2717711
EARTH	2115-07-09 20:45	> 1 w	0.1622484	0.0225886	1.7560921

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
87.14706660	175.44087411	0.00083144	MINIMUM
285.52311877	355.47298330	0.00140823	MINIMUM
6.76229683	85.84777785	0.21566552	SADDLE
185.87559675	264.84258705	0.27253979	SADDLE
6.98625465	266.11228526	1.85639633	SADDLE
184.89280461	83.98930573	2.18256417	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025YW4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2097-12-28.497	87335.497	3.793	1.64 ± 0.013	2.60E5	1.95E-9	6.56E-1	-9.19
2118-12-29.662	95005.662	2.340	1.15 ± 0.008	7.67E6	9.73E-9	6.54E-1	-8.60
2122-12-29.612	96466.612	0.633	0.81 ± 0.032	9.73E6	1.12E-7	6.52E-1	-7.56


Based on 59 optical observations (of which 1 are rejected as outliers) from 2025/12/22.355 to 2025/12/28.215.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.85 and 1.85 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251228 140143.945 UTC.

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Download Impactor Table as: