Asteroids

2025YN4 help

Last update: 2026-01-21 12:46 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.747

Aphelion (Q)

3.248

Eccentricity (e)

0.626

Inclination (i)

10.3

deg

Orbit period (P)

1031.0

Earth MOID

0.02121

U parameter

7.1

Next Earth close approach

Date

2040-06-23

Nominal distance (from Earth center)

0.02497

3735657

Maximum Brightness

15.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.3

mag

Diameter

150 - 300*

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

1.997229

1-sigma variation

0.000734

Unit

Eccentricity (e)

Value

0.626067

1-sigma variation

0.000173

Unit

Inclination (i)

Value

10.2811

1-sigma variation

0.0038

Unit

Long. of Ascending Node (Ω)

Value

279.2069

1-sigma variation

0.0005

Unit

Arg. of Perihelion (ω)

Value

280.8806

1-sigma variation

0.0029

Unit

Mean Anomaly (M)

Value

316.14109

1-sigma variation

0.02474

Unit

Perihelion distance

Value

0.746830

1-sigma variation

Unit

Aphelion distance

Value

3.247629

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.068074

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.393305

1-sigma variation

Unit

MOID

Value

0.021210

1-sigma variation

Unit

Orbit Period

Value

1030.9565

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.38804E-7	1.26972E-7	2.80525E-6	-3.56141E-7	2.12113E-6	1.81625E-5
e	1.26972E-7	2.99229E-8	6.61256E-7	-8.39674E-8	5.00362E-7	4.27992E-6
i	2.80525E-6	6.61256E-7	1.46392E-5	-1.86167E-6	1.11209E-5	9.45363E-5
Ω	-3.56141E-7	-8.39674E-8	-1.86167E-6	2.37676E-7	-1.41988E-6	-1.19994E-5
ω	2.12113E-6	5.00362E-7	1.11209E-5	-1.41988E-6	8.54645E-6	7.14400E-5
M	1.81625E-5	4.27992E-6	9.45363E-5	-1.19994E-5	7.14400E-5	6.12256E-4

Date of computation: 2026-01-21 12:46 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

21.313

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

150 - 300*

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

0.540978

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-21.336245

Unit

Source

[2]

Last Observation

Value

2026-01-21.102893

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

59 (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 2025YN4 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	1975-06-30 15:50	> 1 d	0.0948659	0.0276909	0.1051572
EARTH	1978-01-24 13:46	> 1 d	0.1125977	0.0852414	0.0750402
EARTH	1992-06-08 09:18	> 1 w	0.1513158	0.0175090	0.0935888
EARTH	2040-06-23 02:48	> 1 d	0.0249713	0.0216649	0.0228841
EARTH	2088-06-18 03:52	> 1 mo	0.0788405	0.0114661	0.6101316
EARTH	2122-02-01 11:51	> 1 mo	0.1081221	0.1068452	0.1008707

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
38.95342401	171.55648516	0.02120986	MINIMUM
322.22458406	26.92647243	0.09172590	MINIMUM
0.05675205	97.73618727	0.29821160	SADDLE
1.34282248	280.47621013	1.73805531	SADDLE
180.17919317	279.34871210	2.27186312	SADDLE
180.48213466	99.49780136	4.23923719	MAXIMUM

Download:

MOID Plots

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