Asteroids

2025EF4 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.996

Aphelion (Q)

1.546

Eccentricity (e)

0.217

Inclination (i)

8.9

deg

Orbit period (P)

523.4

Earth MOID

0.00243

U parameter

4.2

Next Earth close approach

Date

2035-04-15

Nominal distance (from Earth center)

0.18102

27079832

Maximum Brightness

23.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.7

mag

Diameter

30 - 70*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-03-11

Observatory

Santel Observatory, El Leoncito

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

1.271076

1-sigma variation

0.000003

Unit

Eccentricity (e)

Value

0.216633

1-sigma variation

0.000002

Unit

Inclination (i)

Value

8.9150

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

174.1834

1-sigma variation

2.817E-6

Unit

Arg. of Perihelion (ω)

Value

354.2710

1-sigma variation

3.016E-5

Unit

Mean Anomaly (M)

Value

313.78884

1-sigma variation

0.00131

Unit

Perihelion distance

Value

0.995720

1-sigma variation

Unit

Aphelion distance

Value

1.546433

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.002437

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.538605

1-sigma variation

Unit

MOID

Value

0.002434

1-sigma variation

Unit

Orbit Period

Value

523.4267

1-sigma variation

Unit

U parameter

Value

4.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.19915E-11	7.35508E-12	2.53060E-10	9.38804E-12	9.09923E-11	-4.51989E-9
e	7.35508E-12	4.51130E-12	1.55218E-10	5.75831E-12	5.57467E-11	-2.77226E-9
i	2.53060E-10	1.55218E-10	5.36201E-9	1.99110E-10	1.90478E-9	-9.53752E-8
Ω	9.38804E-12	5.75831E-12	1.99110E-10	7.93544E-12	7.10834E-11	-3.53884E-9
ω	9.09923E-11	5.57467E-11	1.90478E-9	7.10834E-11	9.09470E-10	-3.44345E-8
M	-4.51989E-9	-2.77226E-9	-9.53752E-8	-3.53884E-9	-3.44345E-8	1.70374E-6

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

24.654

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

30 - 70*

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

343

Unit

Source

[1]

Normalized RMS of residuals

Value

0.412193

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-03-11.05181

Unit

Source

[2]

Last Observation

Value

2025-05-06.332405

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

288 (7)

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 2025EF4 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	1950-03-30 13:23	> 1 d	0.0920280	0.0146734	0.0581034
MARS	1960-07-17 16:12	> 1 d	0.0384053	0.0383591	0.0007767
EARTH	1965-03-15 15:53	99.3	0.0031314	0.0024458	0.0002660
EARTH	1972-03-04 12:13	169.2	0.0524957	0.0505429	0.0006511
EARTH	1979-02-10 05:14	63.0	0.1989120	0.1969492	0.0006546
EARTH	2011-04-14 20:46	2.9	0.1966344	0.1965561	0.0000261
EARTH	2018-03-24 18:02	43.6	0.0497986	0.0492597	0.0001797
EARTH	2025-03-15 09:52	< 1 s	0.0030671	0.0030670	0.0000000
EARTH	2035-04-15 09:47	27.2	0.1810175	0.1802861	0.0002438
EARTH	2058-02-12 15:30	63.2	0.1810323	0.1792118	0.0006071
EARTH	2068-03-12 07:36	158.7	0.0111769	0.0096169	0.0005213
EARTH	2085-04-10 06:09	> 1 d	0.1465417	0.0416617	0.0402530
EARTH	2112-03-10 17:08	> 1 w	0.0237191	0.0003845	0.0415213

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
4.58859652	71.93249374	0.00115161	MINIMUM
181.83301391	249.28260293	0.53946956	SADDLE
4.20337260	251.45078455	2.00258757	SADDLE
182.81747652	70.05919635	2.54073114	MAXIMUM

Download:

MOID Plots

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