Asteroids

2025YZ4 help

Last update: 2026-01-04 13:01 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.646

Aphelion (Q)

1.242

Eccentricity (e)

0.316

Inclination (i)

7.3

deg

Orbit period (P)

334.8

Earth MOID

0.01479

U parameter

5.9

Next Earth close approach

Date

2034-08-30

Nominal distance (from Earth center)

0.18144

27143205

Maximum Brightness

24.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.9

mag

Diameter

28 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-12-22

Observatory

ATLAS-HKO, Haleakala

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

0.943677

1-sigma variation

0.000020

Unit

Eccentricity (e)

Value

0.315927

1-sigma variation

0.000140

Unit

Inclination (i)

Value

7.2811

1-sigma variation

0.0039

Unit

Long. of Ascending Node (Ω)

Value

92.1695

1-sigma variation

3.496E-5

Unit

Arg. of Perihelion (ω)

Value

122.8137

1-sigma variation

0.0008

Unit

Mean Anomaly (M)

Value

236.10536

1-sigma variation

0.01716

Unit

Perihelion distance

Value

0.645544

1-sigma variation

Unit

Aphelion distance

Value

1.241809

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.041350

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.292691

1-sigma variation

Unit

MOID

Value

0.014788

1-sigma variation

Unit

Orbit Period

Value

334.8369

1-sigma variation

Unit

U parameter

Value

5.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.09463E-10	2.82761E-9	7.89899E-8	6.86619E-10	1.62448E-8	3.47180E-7
e	2.82761E-9	1.95423E-8	5.45952E-7	4.74989E-9	1.12699E-7	2.39879E-6
i	7.89899E-8	5.45952E-7	1.52528E-5	1.32834E-7	3.14931E-6	6.70131E-5
Ω	6.86619E-10	4.74989E-9	1.32834E-7	1.22233E-9	2.74496E-8	5.82849E-7
ω	1.62448E-8	1.12699E-7	3.14931E-6	2.74496E-8	6.61573E-7	1.38157E-5
M	3.47180E-7	2.39879E-6	6.70131E-5	5.82849E-7	1.38157E-5	2.94474E-4

Date of computation: 2026-01-04 13:01 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

24.857

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

28 - 60*

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

0.582406

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-11.45332

Unit

Source

[2]

Last Observation

Value

2025-12-30.728075

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

134 (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 2025YZ4 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	1958-08-21 05:57	> 1 mo	0.1282443	0.1118696	6.3702424
EARTH	1960-12-26 00:08	> 1 mo	0.1549048	0.0138378	11.9011824
EARTH	1981-12-16 22:41	> 1 mo	0.1638343	0.0353494	1.6758123
VENUS	1982-04-21 04:02	> 1 mo	0.0385047	0.0091997	2.3351459
EARTH	1992-12-26 14:41	> 1 mo	0.1037403	0.0194012	2.1602047
EARTH	2001-08-28 04:42	> 1 mo	0.1482433	0.1131604	0.4474114
EARTH	2003-12-30 18:25	> 1 d	0.0163214	0.0142658	0.1304409
EARTH	2012-08-26 10:19	> 1 d	0.1296230	0.1106371	0.0364054
EARTH	2014-12-30 13:06	144.5	0.0145413	0.0145354	0.0004028
VENUS	2023-07-14 19:49	129.6	0.0111844	0.0106282	0.0003173
EARTH	2023-08-27 17:05	55.1	0.1349876	0.1335664	0.0004810
EARTH	2025-12-30 09:09	< 1 s	0.0200405	0.0200119	0.0000095
VENUS	2030-09-18 20:39	85.1	0.0434543	0.0427291	0.0002721
EARTH	2034-08-30 05:18	74.2	0.1814411	0.1781360	0.0011069
EARTH	2036-12-28 11:52	188.2	0.0817588	0.0750296	0.0022477
EARTH	2047-12-26 01:55	538.9	0.1152322	0.1064116	0.0029451
EARTH	2058-12-17 19:07	888.3	0.1589543	0.1519250	0.0023466
VENUS	2077-09-02 17:36	79.0	0.0111360	0.0110005	0.0000543
VENUS	2079-07-06 20:48	163.2	0.0167161	0.0151593	0.0005314
EARTH	2079-08-22 04:42	35.2	0.1177093	0.1175286	0.0000628
EARTH	2081-12-29 12:55	36.5	0.0575419	0.0544952	0.0010183
VENUS	2088-07-18 16:43	12.4	0.0426941	0.0426261	0.0000236
EARTH	2090-08-29 09:00	19.8	0.1680214	0.1667402	0.0004292
EARTH	2092-12-28 20:59	31.3	0.0762012	0.0752260	0.0003252
EARTH	2103-12-21 01:47	353.5	0.1504168	0.1476501	0.0009230
EARTH	2124-08-18 12:13	73.9	0.1688279	0.1635668	0.0017738
EARTH	2126-12-26 19:30	77.0	0.1812100	0.1759284	0.0017607

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
261.30144544	357.19746742	0.01478844	MINIMUM
98.03369575	230.12871219	0.11152507	MINIMUM
177.28319406	292.66355174	0.27533209	SADDLE
0.75016165	113.50986302	0.37209916	SADDLE
3.27497103	297.08329899	1.63671507	SADDLE
182.75318788	116.60829452	2.24683456	MAXIMUM

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MOID Plots

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