Asteroids

2025YJ help

Last update: 2025-12-21 12:45 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.996

Aphelion (Q)

1.519

Eccentricity (e)

0.208

Inclination (i)

12.2

deg

Orbit period (P)

514.9

Earth MOID

0.04758

U parameter

7.7

Next Earth close approach

Date

2057-01-01

Nominal distance (from Earth center)

0.11559

17292453

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

14 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-12-16

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

1.257225

1-sigma variation

0.000615

Unit

Eccentricity (e)

Value

0.207885

1-sigma variation

0.000363

Unit

Inclination (i)

Value

12.1944

1-sigma variation

0.0172

Unit

Long. of Ascending Node (Ω)

Value

90.5739

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

39.8036

1-sigma variation

0.0080

Unit

Mean Anomaly (M)

Value

311.63650

1-sigma variation

0.04221

Unit

Perihelion distance

Value

0.995867

1-sigma variation

Unit

Aphelion distance

Value

1.518583

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.053433

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.413607

1-sigma variation

Unit

MOID

Value

0.047576

1-sigma variation

Unit

Orbit Period

Value

514.8941

1-sigma variation

Unit

U parameter

Value

7.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.78168E-7	2.23144E-7	1.06037E-5	-9.25370E-8	-4.43886E-6	2.59348E-5
e	2.23144E-7	1.31731E-7	6.25672E-6	-5.49682E-8	-2.59298E-6	1.52888E-5
i	1.06037E-5	6.25672E-6	2.97339E-4	-2.59554E-6	-1.24496E-4	7.27215E-4
Ω	-9.25370E-8	-5.49682E-8	-2.59554E-6	2.57015E-8	9.28291E-7	-6.25965E-6
ω	-4.43886E-6	-2.59298E-6	-1.24496E-4	9.28291E-7	6.34884E-5	-3.10710E-4
M	2.59348E-5	1.52888E-5	7.27215E-4	-6.25965E-6	-3.10710E-4	1.78209E-3

Date of computation: 2025-12-21 12:45 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

26.339

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

14 - 30*

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

0.422985

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-16.291541

Unit

Source

[2]

Last Observation

Value

2025-12-21.202488

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

30 (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 2025YJ 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	1970-12-30 02:42	> 1 d	0.0688100	0.0455374	0.0384230
EARTH	1994-12-24 01:10	> 1 d	0.1043114	0.0437609	0.1116783
EARTH	2025-12-28 00:39	< 1 min	0.0478719	0.0476580	0.0000713
EARTH	2057-01-01 03:45	> 1 d	0.1155929	0.0406994	0.1127416
EARTH	2080-12-26 14:50	> 1 d	0.0560264	0.0480699	0.0504107
EARTH	2111-12-30 06:33	> 1 w	0.0513392	0.0488267	0.0657571

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
331.98027873	354.78541665	0.04757624	MINIMUM
193.86132618	220.10591693	0.53716513	SADDLE
5.81890105	215.01229653	2.00610029	SADDLE
179.06512234	27.97817959	2.49873851	MAXIMUM

Download:

MOID Plots

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