Asteroids

2026AC4 help

Last update: 2026-03-18 10:55 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.978

Aphelion (Q)

1.066

Eccentricity (e)

0.043

Inclination (i)

0.1

deg

Orbit period (P)

377.2

Earth MOID

0.00052

U parameter

3.6

Next Earth close approach

Date

2026-04-20

Nominal distance (from Earth center)

0.02742

4101975

Maximum Brightness

27.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.2

mag

Diameter

16 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-01-13

Observatory

Pan-STARRS 1, 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.021686

1-sigma variation

0.000001

Unit

Eccentricity (e)

Value

0.042952

1-sigma variation

0.000006

Unit

Inclination (i)

Value

0.0766

1-sigma variation

1.208E-5

Unit

Long. of Ascending Node (Ω)

Value

287.4009

1-sigma variation

0.0044

Unit

Arg. of Perihelion (ω)

Value

299.3505

1-sigma variation

0.0033

Unit

Mean Anomaly (M)

Value

31.24973

1-sigma variation

0.00701

Unit

Perihelion distance

Value

0.977803

1-sigma variation

Unit

Aphelion distance

Value

1.065569

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.017006

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.057080

1-sigma variation

Unit

MOID

Value

0.000519

1-sigma variation

Unit

Orbit Period

Value

377.2024

1-sigma variation

Unit

U parameter

Value

3.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.42320E-13	5.43149E-12	1.01825E-11	3.70209E-9	2.76478E-9	-5.94983E-9
e	5.43149E-12	4.05274E-11	7.61745E-11	2.77121E-8	2.07744E-8	-4.46091E-8
i	1.01825E-11	7.61745E-11	1.45882E-10	5.23625E-8	3.88410E-8	-8.39109E-8
Ω	3.70209E-9	2.77121E-8	5.23625E-8	1.90166E-5	1.41665E-5	-3.05296E-5
ω	2.76478E-9	2.07744E-8	3.88410E-8	1.41665E-5	1.07325E-5	-2.29079E-5
M	-5.94983E-9	-4.46091E-8	-8.39109E-8	-3.05296E-5	-2.29079E-5	4.91645E-5

Date of computation: 2026-03-18 10:55 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

26.166

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

16 - 30*

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

0.474652

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-01-13.404468

Unit

Source

[2]

Last Observation

Value

2026-03-17.052132

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

126 (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

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2026AC4 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	1987-08-23 06:59	179.0	0.1108907	0.0869039	0.0079956
EARTH	1988-08-19 13:40	80.6	0.0272917	0.0023249	0.0083457
EARTH	1989-08-17 11:26	50.6	0.0121327	0.0103410	0.0005973
EARTH	1990-08-25 02:31	12.8	0.1747320	0.1728950	0.0006123
EARTH	2025-03-10 15:39	1.2	0.1251952	0.1251456	0.0000165
EARTH	2026-04-20 16:23	1.2	0.0274200	0.0274055	0.0000048
EARTH	2026-10-14 13:17	61.9	0.0650494	0.0650149	0.0000115
EARTH	2027-08-09 16:11	5.8	0.0968824	0.0968581	0.0000081
EARTH	2057-03-07 04:59	27.3	0.0489884	0.0477710	0.0004058
EARTH	2057-12-11 04:10	155.1	0.0683783	0.0682933	0.0000283
EARTH	2058-07-27 11:56	6.6	0.0147709	0.0144072	0.0001212
EARTH	2059-08-02 01:38	142.4	0.0531191	0.0518181	0.0004337
EARTH	2060-08-05 09:27	89.9	0.1534194	0.1514290	0.0006635
EARTH	2112-02-08 00:36	227.1	0.1926694	0.1682569	0.0081375
EARTH	2113-02-11 06:15	356.5	0.0866427	0.0634317	0.0077371
EARTH	2114-02-13 02:13	> 1 d	0.0018224	0.0003862	0.0045405
EARTH	2124-01-22 12:50	> 1 mo	0.0415367	0.0025148	7.2594477
EARTH	2124-06-18 05:11	> 1 mo	0.0918523	0.0172139	3.8845304

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
81.33677577	206.54855904	0.00051867	MINIMUM
308.97993432	68.49529173	0.00125063	MINIMUM
15.54647385	137.90903598	0.03315649	SADDLE
194.28870269	316.65266340	0.07616871	SADDLE
15.27782722	317.64182243	1.96708720	SADDLE
194.58499786	136.94844727	2.07638517	MAXIMUM

Download:

MOID Plots

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