Asteroids

2025YY4 help

Last update: 2025-12-25 13:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.720

Aphelion (Q)

4.275

Eccentricity (e)

0.712

Inclination (i)

3.0

deg

Orbit period (P)

1441.7

Earth MOID

0.01380

U parameter

8.6

Next Earth close approach

Date

2081-05-10

Nominal distance (from Earth center)

0.07757

11604846

Maximum Brightness

23.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.1

mag

Diameter

26 - 60*

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

2.497556

1-sigma variation

0.010574

Unit

Eccentricity (e)

Value

0.711619

1-sigma variation

0.001339

Unit

Inclination (i)

Value

3.0153

1-sigma variation

0.0054

Unit

Long. of Ascending Node (Ω)

Value

79.2962

1-sigma variation

0.0025

Unit

Arg. of Perihelion (ω)

Value

84.6232

1-sigma variation

0.0009

Unit

Mean Anomaly (M)

Value

341.08776

1-sigma variation

0.12720

Unit

Perihelion distance

Value

0.720248

1-sigma variation

Unit

Aphelion distance

Value

4.274864

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.171760

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.302967

1-sigma variation

Unit

MOID

Value

0.013803

1-sigma variation

Unit

Orbit Period

Value

1441.6881

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.11808E-4	1.41566E-5	5.66834E-5	2.62611E-5	-9.23625E-7	1.34497E-3
e	1.41566E-5	1.79244E-6	7.17685E-6	3.32454E-6	-1.15844E-7	1.70293E-4
i	5.66834E-5	7.17685E-6	2.87478E-5	1.33623E-5	-5.52508E-7	6.81863E-4
Ω	2.62611E-5	3.32454E-6	1.33623E-5	6.38468E-6	-5.96204E-7	3.15911E-4
ω	-9.23625E-7	-1.15844E-7	-5.52508E-7	-5.96204E-7	7.50120E-7	-1.11322E-5
M	1.34497E-3	1.70293E-4	6.81863E-4	3.15911E-4	-1.11322E-5	1.61791E-2

Date of computation: 2025-12-25 13:00 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

25.078

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

26 - 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

0.653195

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-22.251736

Unit

Source

[2]

Last Observation

Value

2025-12-25.157212

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

35 (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 2025YY4 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	1955-05-08 01:25	> 1 mo	0.0920754	0.0213264	5.7712664
EARTH	1962-12-28 00:17	> 1 mo	0.0171615	0.0140282	0.6867816
MARS	1975-02-22 00:38	> 1 mo	0.0451876	0.0190945	0.8099990
VENUS	2002-06-24 14:41	> 1 w	0.0487821	0.0046815	0.0899765
EARTH	2014-05-20 13:48	> 1 w	0.0486385	0.0209576	0.3788381
EARTH	2025-12-25 09:55	< 1 s	0.0204018	0.0202968	0.0000350
EARTH	2081-05-10 06:29	> 1 mo	0.0775736	0.0202291	0.6340437
EARTH	2089-01-23 03:28	> 1 mo	0.1923649	0.0074927	0.1251027
EARTH	2092-12-18 03:36	> 1 w	0.1394152	0.0145866	0.1067576
VENUS	2108-11-21 14:17	> 1 mo	0.0254945	0.0051171	0.7294536

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
328.33226853	353.42373622	0.01380319	MINIMUM
33.44693423	134.34692198	0.02082349	MINIMUM
1.25194063	64.42304846	0.27636052	SADDLE
1.24044886	244.37690760	1.72813193	SADDLE
180.20975424	242.89800416	3.26801260	SADDLE
180.19972779	62.89060848	5.26656898	MAXIMUM

Download:

MOID Plots

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