Asteroids

2025AC help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.961

Aphelion (Q)

1.371

Eccentricity (e)

0.176

Inclination (i)

2.6

deg

Orbit period (P)

459.7

Earth MOID

0.00087

U parameter

4.2

Next Earth close approach

Date

2030-03-31

Nominal distance (from Earth center)

0.10729

16049614

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

29.1

mag

Diameter

4 - 9*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-01-01

Observatory

ATLAS-HKO, 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

1.165694

1-sigma variation

0.000003

Unit

Eccentricity (e)

Value

0.175915

1-sigma variation

0.000002

Unit

Inclination (i)

Value

2.6059

1-sigma variation

4.484E-5

Unit

Long. of Ascending Node (Ω)

Value

101.1328

1-sigma variation

2.825E-5

Unit

Arg. of Perihelion (ω)

Value

33.6193

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

229.60684

1-sigma variation

0.00069

Unit

Perihelion distance

Value

0.960631

1-sigma variation

Unit

Aphelion distance

Value

1.370757

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.001837

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.305165

1-sigma variation

Unit

MOID

Value

0.000873

1-sigma variation

Unit

Orbit Period

Value

459.7007

1-sigma variation

Unit

U parameter

Value

4.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.37798E-12	5.20343E-12	1.20955E-10	7.64310E-11	-4.64413E-10	-1.86084E-9
e	5.20343E-12	3.67206E-12	8.52869E-11	5.39643E-11	-3.25888E-10	-1.31351E-9
i	1.20955E-10	8.52869E-11	2.01024E-9	1.26263E-9	-7.63333E-9	-3.05003E-8
Ω	7.64310E-11	5.39643E-11	1.26263E-9	7.98076E-10	-4.77040E-9	-1.93082E-8
ω	-4.64413E-10	-3.25888E-10	-7.63333E-9	-4.77040E-9	3.04403E-8	1.16308E-7
M	-1.86084E-9	-1.31351E-9	-3.05003E-8	-1.93082E-8	1.16308E-7	4.69898E-7

Date of computation: 2025-09-10 00:30 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

29.095

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

4 - 9*

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

255

Unit

Source

[1]

Normalized RMS of residuals

Value

0.727211

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2024-12-31.22397

Unit

Source

[2]

Last Observation

Value

2025-01-03.547384

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

50 (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 2025AC from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
MARS	1954-07-15 03:47	999.6	0.0493631	0.0411864	0.0029108
EARTH	1971-03-10 14:32	51.9	0.1718669	0.1702642	0.0005345
EARTH	1974-12-21 12:20	191.1	0.0468605	0.0446536	0.0007359
MARS	1980-11-16 05:49	75.9	0.0437342	0.0430755	0.0002206
MARS	1994-03-07 14:36	189.4	0.0245319	0.0244388	0.0000323
EARTH	1996-02-03 10:05	288.3	0.0413136	0.0405469	0.0002570
MARS	2007-04-22 03:53	166.3	0.0296757	0.0296382	0.0000129
MARS	2020-06-02 14:35	36.3	0.0256643	0.0256339	0.0000102
EARTH	2025-01-02 22:35	< 1 s	0.0009373	0.0009373	0.0000000
EARTH	2030-03-31 12:35	11.1	0.1072850	0.1069862	0.0000996
EARTH	2053-12-18 11:15	33.6	0.1022697	0.1012083	0.0003538
EARTH	2059-03-10 05:03	121.8	0.0423559	0.0423023	0.0000186
EARTH	2082-12-18 22:41	50.7	0.1020340	0.1005404	0.0004979
EARTH	2088-03-19 07:42	94.5	0.0480074	0.0477082	0.0001010
MARS	2101-05-30 13:58	143.4	0.0116377	0.0115904	0.0000162
EARTH	2112-03-01 01:50	772.4	0.0420745	0.0420463	0.0000188

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
332.34445005	359.74788561	0.00083463	MINIMUM
183.14009799	215.51424414	0.35870520	SADDLE
3.40884102	215.97476055	1.97387782	SADDLE
182.00544717	34.54462808	2.35698898	MAXIMUM

Download:

MOID Plots

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