Asteroids

2025UK1 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.167

Aphelion (Q)

1.682

Eccentricity (e)

0.181

Inclination (i)

29.0

deg

Orbit period (P)

621.0

Earth MOID

0.18275

U parameter

8.6

Next Earth close approach

Date

2042-10-19

Nominal distance (from Earth center)

0.18365

27473349

Maximum Brightness

20.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.4

mag

Diameter

60 - 120*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-10-18

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

1.424569

1-sigma variation

0.003470

Unit

Eccentricity (e)

Value

0.180997

1-sigma variation

0.001521

Unit

Inclination (i)

Value

28.9575

1-sigma variation

0.0954

Unit

Long. of Ascending Node (Ω)

Value

24.4487

1-sigma variation

0.0039

Unit

Arg. of Perihelion (ω)

Value

22.6672

1-sigma variation

0.1301

Unit

Mean Anomaly (M)

Value

120.88160

1-sigma variation

0.35534

Unit

Perihelion distance

Value

1.166726

1-sigma variation

Unit

Aphelion distance

Value

1.682412

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.183713

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.651348

1-sigma variation

Unit

MOID

Value

0.182747

1-sigma variation

Unit

Orbit Period

Value

621.0460

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.20430E-5	5.27900E-6	3.31088E-4	1.34606E-5	-4.51183E-4	-1.23307E-3
e	5.27900E-6	2.31405E-6	1.45131E-4	5.90037E-6	-1.97761E-4	-5.40521E-4
i	3.31088E-4	1.45131E-4	9.10240E-3	3.70064E-4	-1.24044E-2	-3.38995E-2
Ω	1.34606E-5	5.90037E-6	3.70064E-4	1.50454E-5	-5.04349E-4	-1.37818E-3
ω	-4.51183E-4	-1.97761E-4	-1.24044E-2	-5.04349E-4	1.69260E-2	4.61809E-2
M	-1.23307E-3	-5.40521E-4	-3.38995E-2	-1.37818E-3	4.61809E-2	1.26263E-1

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

23.411

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

60 - 120*

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

174

Unit

Source

[1]

Normalized RMS of residuals

Value

0.520322

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-10-18.290519

Unit

Source

[2]

Last Observation

Value

2025-10-28.095373

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

42 (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 2025UK1 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	1991-10-19 23:48	> 1 d	0.1952522	0.1844076	0.2727297
EARTH	2008-10-19 06:38	1216.1	0.1868335	0.1836860	0.0717282
MARS	2018-01-18 23:23	> 1 d	0.0381725	0.0340037	0.0578010
EARTH	2025-10-19 12:23	2.4	0.1835671	0.1816943	0.0006243
EARTH	2042-10-19 17:58	> 1 d	0.1836480	0.1832063	0.0258556
EARTH	2059-10-19 23:58	> 1 d	0.1863822	0.1833470	0.1399518
EARTH	2076-10-19 05:34	> 1 d	0.1923207	0.1838805	0.3608004

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
342.64722784	285.62362010	0.18317085	MINIMUM
127.83519219	83.33111557	0.62606477	MINIMUM
77.75130125	36.15452651	0.66293067	SADDLE
231.35439375	166.35367306	0.81062042	SADDLE
15.47685979	141.17539685	2.16171478	SADDLE
170.61588519	295.68122368	2.66724983	MAXIMUM

Download:

MOID Plots

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