Asteroids

2022AC4 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.911

Aphelion (Q)

1.817

Eccentricity (e)

0.332

Inclination (i)

5.8

deg

Orbit period (P)

582.0

Earth MOID

0.00073

U parameter

6.4

Next Earth close approach

Date

2057-04-17

Nominal distance (from Earth center)

0.10119

15137264

Maximum Brightness

26.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.9

mag

Diameter

4 - 10*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2022-01-09

Observatory

Mt. Lemmon Survey

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

1.364238

1-sigma variation

0.000108

Unit

Eccentricity (e)

Value

0.332108

1-sigma variation

0.000058

Unit

Inclination (i)

Value

5.8256

1-sigma variation

0.0018

Unit

Long. of Ascending Node (Ω)

Value

110.2520

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

45.6586

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

253.12893

1-sigma variation

0.11472

Unit

Perihelion distance

Value

0.911164

1-sigma variation

Unit

Aphelion distance

Value

1.817312

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.001586

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.563748

1-sigma variation

Unit

MOID

Value

0.000733

1-sigma variation

Unit

Orbit Period

Value

582.0142

1-sigma variation

Unit

U parameter

Value

6.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.16620E-8	6.30668E-9	1.93487E-7	1.38009E-8	-5.80620E-8	-1.23891E-5
e	6.30668E-9	3.41064E-9	1.04616E-7	7.46254E-9	-3.13761E-8	-6.69990E-6
i	1.93487E-7	1.04616E-7	3.21721E-6	2.29258E-7	-9.70400E-7	-2.05548E-4
Ω	1.38009E-8	7.46254E-9	2.29258E-7	1.63446E-8	-6.89992E-8	-1.46612E-5
ω	-5.80620E-8	-3.13761E-8	-9.70400E-7	-6.89992E-8	2.97472E-7	6.16788E-5
M	-1.23891E-5	-6.69990E-6	-2.05548E-4	-1.46612E-5	6.16788E-5	1.31616E-2

Date of computation: 2026-03-17 23:26 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

28.88

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

4 - 10*

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

1545

Unit

Source

[1]

Normalized RMS of residuals

Value

0.54429

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2022-01-09.259958

Unit

Source

[2]

Last Observation

Value

2022-01-10.941453

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

40 (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

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 2022AC4 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	1961-01-12 12:07	159.5	0.0118279	0.0097800	0.0006830
EARTH	1986-02-02 02:46	> 1 w	0.0839986	0.0374646	0.0169742
EARTH	2011-04-14 00:54	> 1 d	0.1294136	0.1288756	0.0006893
EARTH	2022-01-11 05:18	< 1 s	0.0006151	0.0006147	0.0000001
EARTH	2057-04-17 22:38	> 1 d	0.1011864	0.1011567	0.0003968
EARTH	2065-02-14 08:34	> 1 w	0.0968505	0.0652165	0.0117980
EARTH	2073-01-06 18:17	> 1 d	0.0368214	0.0008741	0.0290119
EARTH	2092-05-04 16:51	> 1 w	0.1912812	0.1012899	0.1846702
EARTH	2100-03-08 13:10	> 1 mo	0.1126474	0.1089164	0.0292959
EARTH	2108-01-03 15:38	> 1 w	0.0936790	0.0014179	0.3357451

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
327.07355804	9.13670696	0.00074017	MINIMUM
37.69222016	105.14502925	0.10138327	MINIMUM
13.01336530	71.75918612	0.11361253	SADDLE
182.34080295	236.56670156	0.81291144	SADDLE
3.08086771	237.86671928	1.92038142	SADDLE
180.96965095	55.58110457	2.80643459	MAXIMUM

Download:

MOID Plots

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