Asteroids

2025SS5 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.776

Aphelion (Q)

1.334

Eccentricity (e)

0.264

Inclination (i)

1.5

deg

Orbit period (P)

395.9

Earth MOID

0.00082

U parameter

4.6

Next Earth close approach

Date

2027-01-26

Nominal distance (from Earth center)

0.1945

29097466

Maximum Brightness

35.7

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

27.9

mag

Diameter

7 - 16*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-23

Observatory

University of Arizona 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

1.055158

1-sigma variation

0.000004

Unit

Eccentricity (e)

Value

0.264326

1-sigma variation

0.000011

Unit

Inclination (i)

Value

1.4510

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

187.2365

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

272.7926

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

166.08110

1-sigma variation

0.00037

Unit

Perihelion distance

Value

0.776252

1-sigma variation

Unit

Aphelion distance

Value

1.334064

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.028448

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.008178

1-sigma variation

Unit

MOID

Value

0.000821

1-sigma variation

Unit

Orbit Period

Value

395.8902

1-sigma variation

Unit

U parameter

Value

4.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.51393E-11	4.32063E-11	-5.89125E-10	9.05247E-10	5.82691E-10	-1.43192E-9
e	4.32063E-11	1.23591E-10	-1.68848E-9	2.59510E-9	1.68133E-9	-4.08234E-9
i	-5.89125E-10	-1.68848E-9	2.32125E-8	-3.56914E-8	-2.29698E-8	5.56168E-8
Ω	9.05247E-10	2.59510E-9	-3.56914E-8	5.48868E-8	3.53137E-8	-8.54526E-8
ω	5.82691E-10	1.68133E-9	-2.29698E-8	3.53137E-8	2.38906E-8	-5.48324E-8
M	-1.43192E-9	-4.08234E-9	5.56168E-8	-8.54526E-8	-5.48324E-8	1.35500E-7

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

27.915

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

7 - 16*

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

247

Unit

Source

[1]

Normalized RMS of residuals

Value

0.402358

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-23.301348

Unit

Source

[2]

Last Observation

Value

2025-09-28.857668

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

77 (5)

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 2025SS5 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	1954-10-03 21:00	> 1 d	0.0419216	0.0010274	0.1379669
EARTH	1957-04-11 19:06	> 1 d	0.0133445	0.0027941	0.0295160
EARTH	1972-10-02 02:18	673.3	0.0485787	0.0186525	0.0099785
EARTH	1975-04-09 14:14	706.5	0.0633398	0.0289041	0.0114913
EARTH	1990-10-03 06:27	167.2	0.0626987	0.0590507	0.0012160
EARTH	1993-04-10 00:58	248.6	0.0362827	0.0265461	0.0032489
VENUS	2000-06-21 15:42	256.8	0.0478819	0.0472373	0.0002259
EARTH	2008-09-29 20:54	12.7	0.0119844	0.0116475	0.0001123
EARTH	2011-04-09 06:10	37.6	0.0295313	0.0278887	0.0005476
EARTH	2025-09-28 22:07	< 1 s	0.0006975	0.0006974	0.0000000
EARTH	2027-01-26 14:06	15.0	0.1945045	0.1944905	0.0000047
EARTH	2038-09-30 17:21	46.2	0.0272620	0.0256191	0.0005476
EARTH	2040-02-06 01:42	191.7	0.1807019	0.1806101	0.0000306
EARTH	2051-11-29 16:00	> 1 d	0.1864912	0.1842708	0.0007402
EARTH	2053-04-02 16:16	212.2	0.0101024	0.0029871	0.0027962
EARTH	2064-09-23 08:17	> 1 w	0.0709101	0.0010373	0.1847846
EARTH	2067-04-08 11:15	> 1 w	0.0840478	0.0035960	0.2173263
EARTH	2078-10-03 02:08	> 1 w	0.0827496	0.0007992	0.1598240
EARTH	2080-02-07 21:45	> 1 mo	0.1803703	0.0506465	0.0447322
EARTH	2091-09-21 12:27	> 1 d	0.1336956	0.0002247	0.1240614
EARTH	2094-04-06 20:23	> 1 w	0.0586328	0.0034560	0.1741627
EARTH	2105-09-04 07:14	> 1 w	0.1920155	0.1022442	0.0299818
EARTH	2105-11-17 12:46	> 1 w	0.1713918	0.1140489	0.0191625
EARTH	2107-03-28 10:29	> 1 d	0.0985895	0.0074362	0.0311021
EARTH	2118-09-27 23:21	> 1 w	0.0229516	0.0003687	0.1369866
EARTH	2121-04-11 21:49	> 1 d	0.1250186	0.0054578	0.1702774

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
280.94909980	265.22112392	0.00077119	MINIMUM
78.82621299	92.00342093	0.00311082	MINIMUM
359.85721839	358.57409185	0.20848670	SADDLE
179.91481972	178.64721286	0.31738890	SADDLE
359.88113125	178.60582755	1.79425514	SADDLE
179.94069425	358.66782224	2.31755421	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025SS5

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2078-09-25.046	80301.046	-3.357	0.17 ± 0.022	3.68E6	1.39E-9	2.42E-2	-10.35
2079-09-26.216	80667.216	-0.783	1.53 ± 0.001	2.05E6	2.77E-7	2.41E-2	-8.06
2093-09-27.177	85782.177	-3.032	1.80 ± 0.001	5.78E5	1.27E-9	2.41E-2	-10.50
2094-09-25.409	86145.409	-1.888	1.78 ± 0.001	3.79E6	1.09E-8	2.42E-2	-9.57
2098-09-29.487	87610.487	1.475	0.93 ± 0.000	9.79E6	4.23E-8	2.42E-2	-9.01
2100-09-26.610	88337.610	-3.327	1.31 ± 0.000	3.28E7	1.26E-10	2.42E-2	-11.55
2104-09-29.072	89801.072	-0.700	1.57 ± 0.000	2.74E5	2.93E-6	2.41E-2	-7.20
2106-09-27.965	90529.965	1.203	0.32 ± 0.014	1.76E7	3.91E-8	2.42E-2	-9.09
2106-09-29.741	90531.741	-0.118	1.47 ± 0.000	4.50E5	1.81E-6	2.43E-2	-7.42
2106-09-29.917	90531.917	-0.689	0.07 ± 0.063	1.61E7	7.04E-8	2.42E-2	-8.83
2106-09-30.324	90532.324	0.287	1.63 ± 0.001	1.19E7	4.94E-8	2.42E-2	-8.99
2107-03-26.806	90709.806	0.034	0.75 ± 0.127	1.63E7	8.76E-8	2.43E-2	-8.74
2107-09-29.487	90896.487	-0.125	0.62 ± 0.001	2.02E6	6.62E-7	2.42E-2	-7.86
2107-09-30.137	90897.137	-0.958	1.62 ± 0.001	1.45E6	5.17E-7	2.41E-2	-7.97
2108-03-27.249	91076.249	0.051	1.25 ± 0.022	1.50E7	8.62E-8	2.42E-2	-8.75
2108-09-27.852	91260.852	-2.963	0.18 ± 0.006	8.51E5	2.08E-8	2.43E-2	-9.37
2109-09-26.978	91624.978	-0.071	1.00 ± 0.001	2.63E7	4.64E-8	2.42E-2	-9.03
2109-09-30.134	91628.134	0.267	1.61 ± 0.000	8.80E7	9.71E-9	2.42E-2	-9.71
2110-03-27.716	91806.716	0.270	0.79 ± 0.000	3.67E7	3.77E-8	2.42E-2	-9.12
2110-03-27.766	91806.766	0.270	0.94 ± 0.002	7.33E6	1.61E-7	2.42E-2	-8.49
2110-03-27.932	91806.932	1.452	0.10 ± 0.253	3.73E7	1.32E-8	2.42E-2	-9.58
2110-03-27.991	91806.991	1.459	0.67 ± 0.001	9.34E5	4.93E-7	2.42E-2	-8.01
2110-09-27.955	91990.955	1.322	0.27 ± 0.009	7.49E6	7.99E-8	2.42E-2	-8.80
2110-09-28.620	91991.620	0.027	1.03 ± 0.000	2.35E8	5.66E-9	2.42E-2	-9.95
2112-09-28.724	92722.724	-0.037	1.80 ± 0.001	1.31E7	1.08E-8	2.41E-2	-9.68
2112-09-29.530	92723.530	0.101	1.73 ± 0.000	4.55E6	8.76E-8	2.42E-2	-8.77
2112-09-29.945	92723.945	0.120	1.35 ± 0.000	1.80E6	5.30E-7	2.42E-2	-7.99
2116-09-26.558	94181.558	-3.167	1.43 ± 0.000	1.24E8	7.43E-11	2.41E-2	-11.86
2116-09-29.002	94184.002	-0.699	1.33 ± 0.000	2.11E7	5.28E-8	2.42E-2	-9.01
2117-09-29.381	94549.381	-1.020	0.40 ± 0.045	8.45E7	1.01E-8	2.41E-2	-9.73
2118-09-29.593	94914.593	0.003	1.43 ± 0.000	2.38E7	3.74E-8	2.42E-2	-9.17
2118-09-29.717	94914.717	-0.702	1.34 ± 0.000	3.82E6	2.14E-7	2.42E-2	-8.41
2118-09-29.735	94914.735	0.004	0.87 ± 0.000	3.06E7	4.23E-8	2.42E-2	-9.11
2118-09-30.674	94915.674	1.197	1.21 ± 0.000	1.30E7	4.69E-8	2.42E-2	-9.07
2119-09-27.473	95277.473	0.732	1.72 ± 0.000	3.11E6	1.07E-7	2.42E-2	-8.72
2119-09-30.031	95280.031	-0.119	0.46 ± 0.000	6.86E6	2.03E-7	2.44E-2	-8.43
2119-09-30.652	95280.652	1.471	1.41 ± 0.000	9.94E6	3.04E-8	2.42E-2	-9.26
2120-09-27.625	95643.625	1.170	1.43 ± 0.000	2.44E7	2.03E-8	2.42E-2	-9.44
2120-09-29.458	95645.458	-0.689	1.68 ± 0.063	8.85E7	1.05E-8	2.42E-2	-9.73
2120-09-29.738	95645.738	0.293	0.52 ± 0.000	7.83E6	1.68E-7	2.42E-2	-8.52
2120-09-29.751	95645.751	1.211	0.94 ± 0.022	1.27E7	4.94E-8	2.42E-2	-9.05
2120-09-29.817	95645.817	1.294	1.69 ± 0.001	1.26E6	1.70E-7	2.42E-2	-8.52
2120-09-29.862	95645.862	0.310	1.80 ± 0.000	8.50E7	9.04E-9	2.42E-2	-9.79
2120-09-29.961	95645.961	1.264	0.23 ± 0.000	1.21E6	5.26E-7	2.42E-2	-8.03
2121-09-28.680	96009.680	-0.124	0.71 ± 0.000	7.48E7	1.85E-8	2.43E-2	-9.48
2121-09-28.725	96009.725	-0.114	1.74 ± 0.000	3.87E7	3.12E-8	2.44E-2	-9.26
2122-09-28.528	96374.528	1.381	1.60 ± 0.000	5.92E7	4.34E-9	2.42E-2	-10.12
2122-09-29.177	96375.177	-0.074	0.58 ± 0.000	2.37E7	5.74E-8	2.42E-2	-9.00
2123-09-27.865	96738.865	-2.947	0.93 ± 0.001	4.51E5	3.58E-8	2.41E-2	-9.21
2123-09-29.392	96740.392	0.279	0.83 ± 0.253	1.01E8	1.35E-8	2.42E-2	-9.63
2123-09-29.532	96740.532	1.130	1.76 ± 0.000	2.51E7	6.13E-9	2.42E-2	-9.97
2124-03-27.494	96920.494	1.128	0.98 ± 0.063	2.44E7	3.08E-8	2.42E-2	-9.28
2124-09-25.915	97102.915	-0.781	1.58 ± 0.011	4.70E7	2.25E-8	2.41E-2	-9.41
2124-09-29.419	97106.419	0.100	1.66 ± 0.000	7.84E6	6.87E-8	2.42E-2	-8.93
2124-09-29.486	97106.486	0.101	0.76 ± 0.001	1.89E7	6.85E-8	2.43E-2	-8.93
2124-09-29.677	97106.677	0.096	1.36 ± 0.000	2.21E6	4.26E-7	2.42E-2	-8.14
2125-09-25.674	97467.674	-1.888	1.60 ± 0.001	6.78E6	1.72E-8	2.42E-2	-9.54
2125-09-29.375	97471.375	0.284	0.99 ± 0.011	6.48E7	1.81E-8	2.42E-2	-9.51
2125-09-29.613	97471.613	1.339	1.23 ± 0.000	7.79E6	5.53E-8	2.42E-2	-9.03
2125-09-29.954	97471.954	0.254	1.65 ± 0.000	4.44E7	1.42E-8	2.42E-2	-9.62


Based on 86 optical observations (of which 6 are rejected as outliers) from 2025/09/23.301 to 2025/09/28.858.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.80 and 1.81 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20251002 142105.456 UTC.

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