Asteroids

2025YY8 help

Last update: 2026-01-19 12:46 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.991

Aphelion (Q)

2.428

Eccentricity (e)

0.421

Inclination (i)

3.3

deg

Orbit period (P)

816.3

Earth MOID

0.00932

U parameter

7.2

Next Earth close approach

Date

2046-03-05

Nominal distance (from Earth center)

0.12799

19146384

Maximum Brightness

22.9

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

2025-12-28

Observatory

Purple Mountain Observatory, XuYi Station

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

1.709432

1-sigma variation

0.000650

Unit

Eccentricity (e)

Value

0.420564

1-sigma variation

0.000218

Unit

Inclination (i)

Value

3.3185

1-sigma variation

0.0014

Unit

Long. of Ascending Node (Ω)

Value

295.3921

1-sigma variation

0.0009

Unit

Arg. of Perihelion (ω)

Value

191.4637

1-sigma variation

0.0004

Unit

Mean Anomaly (M)

Value

331.99741

1-sigma variation

0.01613

Unit

Perihelion distance

Value

0.990506

1-sigma variation

Unit

Aphelion distance

Value

2.428358

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.376347

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.012295

1-sigma variation

Unit

MOID

Value

0.009324

1-sigma variation

Unit

Orbit Period

Value

816.3497

1-sigma variation

Unit

U parameter

Value

7.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.21971E-7	1.41640E-7	8.87059E-7	6.04346E-7	2.74397E-7	1.04751E-5
e	1.41640E-7	4.75432E-8	2.97753E-7	2.02856E-7	9.21060E-8	3.51611E-6
i	8.87059E-7	2.97753E-7	1.86480E-6	1.27033E-6	5.77084E-7	2.20206E-5
Ω	6.04346E-7	2.02856E-7	1.27033E-6	8.66176E-7	3.92430E-7	1.50024E-5
ω	2.74397E-7	9.21060E-8	5.77084E-7	3.92430E-7	1.80541E-7	6.81114E-6
M	1.04751E-5	3.51611E-6	2.20206E-5	1.50024E-5	6.81114E-6	2.60038E-4

Date of computation: 2026-01-19 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

24.897

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

0.645121

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-28.242434

Unit

Source

[2]

Last Observation

Value

2026-01-18.502557

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

112 (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 2025YY8 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	1988-01-20 15:08	> 1 mo	0.0099687	0.0097948	0.0090810
EARTH	2026-01-08 01:07	< 1 min	0.0316355	0.0315902	0.0000151
EARTH	2046-03-05 14:27	> 1 d	0.1279857	0.0330882	0.0648568
EARTH	2075-01-17 02:38	> 1 w	0.0132040	0.0090616	0.0181568
EARTH	2106-03-01 15:44	> 1 mo	0.0863406	0.0294859	0.6060463
EARTH	2126-01-14 10:42	> 1 mo	0.0209654	0.0079607	0.1288655

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
355.99610916	18.95428790	0.00932331	MINIMUM
180.45095554	205.99772577	1.41198526	SADDLE
1.02976995	206.68140975	2.00684185	SADDLE
180.35513976	25.93063685	3.41347193	MAXIMUM

Download:

MOID Plots

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