Asteroids

2025UM help

Last update: 2025-10-18 21:15 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.905

Aphelion (Q)

3.965

Eccentricity (e)

0.628

Inclination (i)

1.7

deg

Orbit period (P)

1388.0

Earth MOID

0.00285

U parameter

7.9

Next Earth close approach

Date

2044-10-07

Nominal distance (from Earth center)

0.05698

8523529

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.2

mag

Diameter

40 - 90*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-10-16

Observatory

ATLAS Chile, Rio Hurtado

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

2.435179

1-sigma variation

0.004824

Unit

Eccentricity (e)

Value

0.628230

1-sigma variation

0.000768

Unit

Inclination (i)

Value

1.6585

1-sigma variation

0.0016

Unit

Long. of Ascending Node (Ω)

Value

118.5216

1-sigma variation

0.0389

Unit

Arg. of Perihelion (ω)

Value

218.7935

1-sigma variation

0.0373

Unit

Mean Anomaly (M)

Value

17.98465

1-sigma variation

0.05538

Unit

Perihelion distance

Value

0.905326

1-sigma variation

Unit

Aphelion distance

Value

3.965032

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.900667

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.027420

1-sigma variation

Unit

MOID

Value

0.002854

1-sigma variation

Unit

Orbit Period

Value

1388.0169

1-sigma variation

Unit

U parameter

Value

7.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.32670E-5	3.70667E-6	7.81702E-6	-1.48145E-4	1.32464E-4	-2.67123E-4
e	3.70667E-6	5.90519E-7	1.24546E-6	-2.35290E-5	2.10266E-5	-4.25548E-5
i	7.81702E-6	1.24546E-6	2.62807E-6	-4.87813E-5	4.34567E-5	-8.97371E-5
Ω	-1.48145E-4	-2.35290E-5	-4.87813E-5	1.51590E-3	-1.44768E-3	1.70539E-3
ω	1.32464E-4	2.10266E-5	4.34567E-5	-1.44768E-3	1.39188E-3	-1.52562E-3
M	-2.67123E-4	-4.25548E-5	-8.97371E-5	1.70539E-3	-1.52562E-3	3.06681E-3

Date of computation: 2025-10-18 21:15 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

24.193

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

40 - 90*

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

0.690476

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-10-16.194908

Unit

Source

[2]

Last Observation

Value

2025-10-18.57944

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

37 (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 2025UM 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	1961-07-29 03:54	> 1 mo	0.0829957	0.0091740	0.4143129
EARTH	1976-10-13 21:38	> 1 d	0.0309300	0.0286891	0.0058512
EARTH	1991-10-22 20:46	> 1 mo	0.0627378	0.0288961	0.5242383
EARTH	2025-10-13 11:46	< 1 min	0.0325537	0.0324489	0.0000349
EARTH	2044-10-07 11:16	> 1 mo	0.0569763	0.0292675	0.2356581
EARTH	2093-08-25 22:50	> 1 mo	0.1240948	0.1048310	0.0076272
EARTH	2112-07-12 19:17	> 1 mo	0.0369426	0.0023792	0.2745910

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
337.91998877	191.79161550	0.00285368	MINIMUM
20.01436139	277.52683246	0.02838092	MINIMUM
359.14731810	235.11752121	0.10658631	SADDLE
358.91985993	54.61821366	1.89615372	SADDLE
179.75637226	55.67300082	2.97421639	SADDLE
179.73584970	235.65919698	4.97537615	MAXIMUM

Download:

MOID Plots

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