Asteroids

2025YA4 help

Last update: 2025-12-31 13:01 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.679

Aphelion (Q)

1.989

Eccentricity (e)

0.491

Inclination (i)

6.7

deg

Orbit period (P)

562.6

Earth MOID

0.02039

U parameter

8.8

Next Earth close approach

Date

2046-01-07

Nominal distance (from Earth center)

0.04626

6920064

Maximum Brightness

20.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.7

mag

Diameter

30 - 70*

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

1.333782

1-sigma variation

0.003340

Unit

Eccentricity (e)

Value

0.491112

1-sigma variation

0.001783

Unit

Inclination (i)

Value

6.7027

1-sigma variation

0.0260

Unit

Long. of Ascending Node (Ω)

Value

92.4836

1-sigma variation

0.0089

Unit

Arg. of Perihelion (ω)

Value

99.4482

1-sigma variation

0.0145

Unit

Mean Anomaly (M)

Value

297.52064

1-sigma variation

0.28433

Unit

Perihelion distance

Value

0.678746

1-sigma variation

Unit

Aphelion distance

Value

1.988819

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.117361

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.081565

1-sigma variation

Unit

MOID

Value

0.020389

1-sigma variation

Unit

Orbit Period

Value

562.6337

1-sigma variation

Unit

U parameter

Value

8.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.11568E-5	5.95481E-6	8.67382E-5	2.96562E-5	-4.82988E-5	9.49721E-4
e	5.95481E-6	3.17839E-6	4.62950E-5	1.58288E-5	-2.57690E-5	5.06905E-4
i	8.67382E-5	4.62950E-5	6.74356E-4	2.30562E-4	-3.75582E-4	7.38360E-3
Ω	2.96562E-5	1.58288E-5	2.30562E-4	7.88312E-5	-1.28367E-4	2.52449E-3
ω	-4.82988E-5	-2.57690E-5	-3.75582E-4	-1.28367E-4	2.10408E-4	-4.11136E-3
M	9.49721E-4	5.06905E-4	7.38360E-3	2.52449E-3	-4.11136E-3	8.08453E-2

Date of computation: 2025-12-31 13:01 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

24.667

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

30 - 70*

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

0.37684

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-12-21.388646

Unit

Source

[2]

Last Observation

Value

2025-12-31.081447

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

36 (1)

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 2025YA4 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	1955-01-01 22:56	> 1 w	0.0641031	0.0229913	0.2347011
EARTH	1961-06-22 21:12	> 1 w	0.1331510	0.0240837	0.1361226
EARTH	1971-12-30 22:07	> 1 d	0.1110105	0.0216738	0.0507973
EARTH	1978-06-14 12:38	> 1 w	0.1880364	0.0329731	0.1469002
EARTH	1988-12-26 04:25	> 1 w	0.1958565	0.0213527	0.3227662
EARTH	2015-07-10 11:57	> 1 w	0.1119009	0.0204761	0.3935372
VENUS	2021-06-27 07:25	> 1 w	0.0338277	0.0338127	0.0022926
VENUS	2024-07-30 10:10	> 1 w	0.0420708	0.0334661	0.0170883
EARTH	2026-01-04 02:51	< 1 min	0.0334376	0.0330777	0.0001200
EARTH	2046-01-07 08:32	> 1 w	0.0462578	0.0253835	0.1702499
VENUS	2046-03-15 15:25	> 1 mo	0.0469473	0.0378032	0.0827851
VENUS	2049-04-17 11:59	> 1 mo	0.0384861	0.0379027	0.0270929
VENUS	2052-05-19 06:32	> 1 mo	0.0429414	0.0375766	0.1238451
EARTH	2052-06-20 04:24	> 1 w	0.1562578	0.0301815	0.2244411
EARTH	2089-07-11 07:03	> 1 w	0.1301974	0.0236031	0.1644517
EARTH	2100-01-18 21:32	> 1 d	0.1671850	0.1093831	0.0193200
EARTH	2106-07-10 13:08	> 1 d	0.0909460	0.0235820	0.1322406
EARTH	2117-01-16 09:18	> 1 w	0.1437215	0.0236851	0.2460016
VENUS	2121-10-10 17:35	> 1 mo	0.0381598	0.0349179	0.0718468
EARTH	2123-07-08 04:44	> 1 w	0.0457174	0.0235210	0.1968699

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
60.60266877	180.67243684	0.02034232	MINIMUM
301.85496950	3.21681098	0.02499784	MINIMUM
1.75883032	92.23993771	0.33645203	SADDLE
180.63186755	271.54772605	1.00719204	SADDLE
2.40570796	273.35996397	1.67577654	SADDLE
180.96331550	91.74278676	2.99086046	MAXIMUM

Download:

MOID Plots

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