Asteroids

2025YK9 help

Last update: 2026-02-10 13:02 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.894

Aphelion (Q)

5.231

Eccentricity (e)

0.708

Inclination (i)

15.0

deg

Orbit period (P)

1957.2

Earth MOID

0.08133

U parameter

6.0

Next Earth close approach

Date

2026-03-02

Nominal distance (from Earth center)

0.08176

12230584

Maximum Brightness

22.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

400 - 1000*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-12-28

Observatory

Pan-STARRS 2, 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

3.062180

1-sigma variation

0.000357

Unit

Eccentricity (e)

Value

0.708210

1-sigma variation

0.000036

Unit

Inclination (i)

Value

15.0250

1-sigma variation

0.0004

Unit

Long. of Ascending Node (Ω)

Value

168.6913

1-sigma variation

0.0007

Unit

Arg. of Perihelion (ω)

Value

12.3850

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

338.84248

1-sigma variation

0.00368

Unit

Perihelion distance

Value

0.893512

1-sigma variation

Unit

Aphelion distance

Value

5.230847

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.091724

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

3.943909

1-sigma variation

Unit

MOID

Value

0.081333

1-sigma variation

Unit

Orbit Period

Value

1957.2416

1-sigma variation

Unit

U parameter

Value

6.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.27104E-7	1.27031E-8	1.54741E-7	2.16135E-7	-9.27332E-8	1.31081E-6
e	1.27031E-8	1.26963E-9	1.54664E-8	2.16606E-8	-9.29413E-9	1.31000E-7
i	1.54741E-7	1.54664E-8	1.88528E-7	2.63697E-7	-1.12731E-7	1.59570E-6
Ω	2.16135E-7	2.16606E-8	2.63697E-7	4.83571E-7	-2.22460E-7	2.21909E-6
ω	-9.27332E-8	-9.29413E-9	-1.12731E-7	-2.22460E-7	1.06932E-7	-9.51215E-7
M	1.31081E-6	1.31000E-7	1.59570E-6	2.21909E-6	-9.51215E-7	1.35191E-5

Date of computation: 2026-02-10 13:02 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

18.965

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

400 - 1000*

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

0.8

Unit

Source

[1]

Normalized RMS of residuals

Value

0.607681

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-28.428208

Unit

Source

[2]

Last Observation

Value

2026-02-10.03305

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

166 (3)

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 2025YK9 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	1952-03-21 21:13	> 1 d	0.1100449	0.1044379	0.0087603
JUPITER	1987-04-27 23:37	1347.3	0.3508079	0.3454481	0.0018703
EARTH	2026-03-02 10:13	< 1 min	0.0817564	0.0817413	0.0000050
JUPITER	2034-09-27 02:16	549.6	0.3642415	0.3640172	0.0000965
EARTH	2063-02-12 16:35	> 1 w	0.1042815	0.0955798	0.0188402
JUPITER	2082-01-21 11:35	> 1 d	0.3854748	0.3837257	0.0008309
EARTH	2116-03-15 13:40	> 1 d	0.1833249	0.1705095	0.0053490

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
350.37599853	56.21231357	0.08133327	MINIMUM
1.61448741	262.04229552	1.89606145	SADDLE
180.37370600	259.69568580	4.22893393	SADDLE
180.05018177	79.56486908	6.22709508	MAXIMUM

Download:

MOID Plots

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