Asteroids

2025SU4 help

Last update: 2025-09-25 13:26 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.727

Aphelion (Q)

1.214

Eccentricity (e)

0.251

Inclination (i)

1.6

deg

Orbit period (P)

349.2

Earth MOID

0.00019

U parameter

6.2

Next Earth close approach

Date

2044-05-06

Nominal distance (from Earth center)

0.03054

4569308

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

31.9

mag

Diameter

1.1 - 2.4*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-23

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.970487

1-sigma variation

0.000036

Unit

Eccentricity (e)

Value

0.250953

1-sigma variation

0.000017

Unit

Inclination (i)

Value

1.6407

1-sigma variation

0.0010

Unit

Long. of Ascending Node (Ω)

Value

1.4334

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

111.5774

1-sigma variation

0.0080

Unit

Mean Anomaly (M)

Value

336.04262

1-sigma variation

0.00703

Unit

Perihelion distance

Value

0.726940

1-sigma variation

Unit

Aphelion distance

Value

1.214033

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.001627

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.165112

1-sigma variation

Unit

MOID

Value

0.000193

1-sigma variation

Unit

Orbit Period

Value

349.2070

1-sigma variation

Unit

U parameter

Value

6.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.26296E-9	5.06989E-10	-3.57736E-8	7.88872E-9	-2.83248E-7	2.48383E-7
e	5.06989E-10	2.80002E-10	-1.42727E-8	2.82448E-9	-1.11365E-7	1.06626E-7
i	-3.57736E-8	-1.42727E-8	1.04399E-6	-2.30366E-7	8.03149E-6	-7.02675E-6
Ω	7.88872E-9	2.82448E-9	-2.30366E-7	5.22324E-8	-1.78092E-6	1.52029E-6
ω	-2.83248E-7	-1.11365E-7	8.03149E-6	-1.78092E-6	6.35979E-5	-5.54941E-5
M	2.48383E-7	1.06626E-7	-7.02675E-6	1.52029E-6	-5.54941E-5	4.94746E-5

Date of computation: 2025-09-25 13:26 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

31.931

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

1.1 - 2.4*

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

0.8

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.417214

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-23.210048

Unit

Source

[2]

Last Observation

Value

2025-09-24.042946

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

30 (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 2025SU4 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	1962-09-12 18:15	422.7	0.1673590	0.1488730	0.0061622
EARTH	1967-10-23 13:52	> 1 d	0.0999135	0.0912911	0.0028814
EARTH	1973-02-05 09:06	486.2	0.0585342	0.0541696	0.0015036
EARTH	1991-09-18 08:03	578.6	0.0806004	0.0613319	0.0064233
EARTH	1996-11-11 20:49	> 1 d	0.1248717	0.1200025	0.0016312
EARTH	2002-02-07 02:21	744.3	0.0532809	0.0462091	0.0026179
EARTH	2025-09-24 08:33	< 1 min	0.0001496	0.0001495	0.0000000
EARTH	2044-05-06 15:40	128.6	0.0305439	0.0233265	0.0028212
EARTH	2045-06-16 23:13	> 1 d	0.1763011	0.1728012	0.0011671
EARTH	2046-08-02 20:09	> 1 d	0.1931561	0.1919849	0.0003909
EARTH	2047-09-25 10:57	127.1	0.0443566	0.0398401	0.0015061
EARTH	2048-09-17 23:29	16.2	0.1978486	0.1962619	0.0005290
VENUS	2061-05-31 07:44	> 1 d	0.0179707	0.0039111	0.0082147
EARTH	2068-05-12 16:49	132.1	0.1966000	0.1806369	0.0053211
EARTH	2069-05-05 09:54	142.0	0.0340446	0.0261556	0.0029945
EARTH	2070-06-21 21:00	> 1 d	0.1880369	0.1853848	0.0008843
EARTH	2071-08-02 16:12	87.3	0.1971356	0.1952867	0.0006166
EARTH	2072-09-23 14:28	100.5	0.0693470	0.0603514	0.0030037
EARTH	2073-09-20 02:13	443.8	0.1579671	0.1445104	0.0044877
VENUS	2083-07-31 02:25	> 1 d	0.0337972	0.0073963	0.0153752
VENUS	2090-04-16 07:15	> 1 d	0.0206180	0.0062925	0.0144299
EARTH	2095-05-06 13:02	209.7	0.0202891	0.0190028	0.0041534
EARTH	2096-06-19 08:57	> 1 w	0.1829233	0.1604314	0.0075045
EARTH	2097-08-02 06:08	> 1 w	0.1955393	0.1595871	0.0120223
EARTH	2098-09-24 17:59	> 1 d	0.0586451	0.0017071	0.0669092
EARTH	2099-09-19 22:06	> 1 d	0.1759009	0.0013963	0.0747232
VENUS	2105-09-06 17:56	> 1 mo	0.0121127	0.0101695	0.0423544
EARTH	2119-05-08 02:41	1138.4	0.0372093	0.0192109	0.6703822
EARTH	2120-06-29 03:22	> 1 mo	0.1918188	0.0255574	0.1345829
EARTH	2121-08-15 05:04	> 1 w	0.1766591	0.0111525	0.0756183
EARTH	2122-09-26 04:20	> 1 w	0.0196687	0.0014342	0.4720110

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
262.17869859	260.70402986	0.00019348	MINIMUM
98.99708147	123.94990831	0.02045448	MINIMUM
180.34689245	192.15530700	0.19846925	SADDLE
0.87944789	12.55678073	0.25796447	SADDLE
1.15686231	192.89727185	1.74455520	SADDLE
180.69522769	12.42274682	2.19776087	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2025SU4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2114-09-27.545	93451.545	1.886	0.81 ± 0.027	1.09E6	2.10E-7	8.79E-5	-10.35	0
2122-09-27.403	96373.403	1.115	0.71 ± 0.036	4.48E6	1.66E-7	8.79E-5	-10.49	0
2123-09-28.226	96739.226	1.065	1.25 ± 0.084	7.67E5	8.22E-7	8.81E-5	-9.80	0
2123-09-28.227	96739.227	1.065	1.35 ± 0.091	7.52E5	8.40E-7	8.81E-5	-9.79	0
2123-09-28.453	96739.453	1.114	1.06 ± 0.065	1.87E6	3.89E-7	8.81E-5	-10.13	0
2124-09-27.368	97104.368	1.065	1.50 ± 0.087	1.08E8	4.76E-9	8.83E-5	-12.04	0
2124-09-27.563	97104.563	1.114	0.28 ± 0.110	2.38E8	3.32E-9	8.83E-5	-12.20	0
2125-09-26.893	97468.893	0.762	1.52 ± 0.035	4.97E5	1.33E-6	8.79E-5	-9.60	n/a


Based on 30 optical observations (of which 0 are rejected as outliers) from 2025/09/23.210 to 2025/09/24.043.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.88 and 1.88 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20250925 154606.195 UTC.

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Download Impactor Table as: