Asteroids

2023UK3 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.913

Aphelion (Q)

2.247

Eccentricity (e)

0.422

Inclination (i)

3.0

deg

Orbit period (P)

725.5

Earth MOID

0.00039

U parameter

7.8

Next Earth close approach

Date

2025-10-21

Nominal distance (from Earth center)

0.01617

2419146

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

29.1

mag

Diameter

4 - 9*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2023-10-20

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

1.580081

1-sigma variation

0.001139

Unit

Eccentricity (e)

Value

0.422345

1-sigma variation

0.000273

Unit

Inclination (i)

Value

3.0127

1-sigma variation

0.0043

Unit

Long. of Ascending Node (Ω)

Value

211.1219

1-sigma variation

0.0049

Unit

Arg. of Perihelion (ω)

Value

223.3723

1-sigma variation

0.0754

Unit

Mean Anomaly (M)

Value

357.20492

1-sigma variation

0.15768

Unit

Perihelion distance

Value

0.912741

1-sigma variation

Unit

Aphelion distance

Value

2.247420

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.867427

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.001572

1-sigma variation

Unit

MOID

Value

0.000388

1-sigma variation

Unit

Orbit Period

Value

725.4665

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.29703E-6	3.10484E-7	-4.86773E-6	5.56115E-6	-8.58288E-5	1.79580E-4
e	3.10484E-7	7.43257E-8	-1.16518E-6	1.33112E-6	-2.05450E-5	4.29878E-5
i	-4.86773E-6	-1.16518E-6	1.82715E-5	-2.08759E-5	3.22141E-4	-6.73968E-4
Ω	5.56115E-6	1.33112E-6	-2.08759E-5	2.38528E-5	-3.68047E-4	7.69980E-4
ω	-8.58288E-5	-2.05450E-5	3.22141E-4	-3.68047E-4	5.67988E-3	-1.18835E-2
M	1.79580E-4	4.29878E-5	-6.73968E-4	7.69980E-4	-1.18835E-2	2.48638E-2

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

29.104

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

[-]

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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

694

Unit

Source

[1]

Normalized RMS of residuals

Value

0.428863

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2023-10-20.251289

Unit

Source

[2]

Last Observation

Value

2023-10-22.189645

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

25 (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 2023UK3 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
EARTH	1960-10-12 06:24	> 1 w	0.0871742	0.0038287	0.1647100
EARTH	1962-11-14 14:00	> 1 mo	0.0608244	0.0139353	0.0699155
EARTH	1965-01-11 00:31	> 1 w	0.0501147	0.0500469	0.0049435
EARTH	1967-02-01 05:12	> 1 d	0.1971986	0.0520947	0.1147523
EARTH	2021-10-04 17:01	362.8	0.1973719	0.1840036	0.0044563
EARTH	2023-10-23 19:46	< 1 min	0.0055797	0.0055744	0.0000018
EARTH	2025-10-21 13:49	897.9	0.0161710	0.0040587	0.0040435
EARTH	2027-10-12 10:18	1030.6	0.1031152	0.0762063	0.0089710

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
331.63926307	289.52325749	0.00029624	MINIMUM
25.82736728	11.42493288	0.05105751	MINIMUM
1.39210690	334.55935085	0.07953663	SADDLE
179.70910083	151.55192642	1.24577007	SADDLE
359.00781099	150.88326996	1.92770358	SADDLE
179.53249149	331.44461921	3.24406694	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2023UK3

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2050-10-24.798	70103.798	3.496	0.21 ± 0.004	1.42E4	2.06E-7	4.90E-3	-8.44
2050-10-24.836	70103.836	4.575	1.64 ± 0.002	2.72E5	1.35E-10	4.90E-3	-11.62
2052-10-24.295	70834.295	3.446	0.19 ± 0.001	3.72E4	9.33E-8	4.90E-3	-8.81


Based on 25 optical observations (of which 0 are rejected as outliers) from 2023/10/20.251 to 2023/10/22.190.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.66 and 1.66 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: