Asteroids

2025SS5 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.776

Aphelion (Q)

1.335

Eccentricity (e)

0.265

Inclination (i)

1.4

deg

Orbit period (P)

396.0

Earth MOID

0.00077

U parameter

7.1

Next Earth close approach

Date

2025-09-28

Nominal distance (from Earth center)

0.0007

104361

Maximum Brightness

14.3

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

27.6

mag

Diameter

8 - 18*

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

1.055353

1-sigma variation

0.000153

Unit

Eccentricity (e)

Value

0.264819

1-sigma variation

0.000468

Unit

Inclination (i)

Value

1.4478

1-sigma variation

0.0038

Unit

Long. of Ascending Node (Ω)

Value

187.2416

1-sigma variation

0.0065

Unit

Arg. of Perihelion (ω)

Value

272.8062

1-sigma variation

0.0157

Unit

Mean Anomaly (M)

Value

344.23511

1-sigma variation

0.02932

Unit

Perihelion distance

Value

0.775876

1-sigma variation

Unit

Aphelion distance

Value

1.334831

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.030407

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.007697

1-sigma variation

Unit

MOID

Value

0.000771

1-sigma variation

Unit

Orbit Period

Value

396.0000

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.34864E-8	7.16570E-8	-4.88558E-7	-8.83609E-8	2.27776E-6	4.48047E-6
e	7.16570E-8	2.18886E-7	-1.47478E-6	-3.23515E-7	7.00949E-6	1.36938E-5
i	-4.88558E-7	-1.47478E-6	1.44742E-5	-1.14832E-5	-3.70584E-5	-8.86276E-5
Ω	-8.83609E-8	-3.23515E-7	-1.14832E-5	4.16846E-5	-4.10357E-5	-3.12126E-5
ω	2.27776E-6	7.00949E-6	-3.70584E-5	-4.10357E-5	2.48048E-4	4.46264E-4
M	4.48047E-6	1.36938E-5	-8.86276E-5	-3.12126E-5	4.46264E-4	8.59866E-4

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

27.646

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

8 - 18*

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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.330119

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

2025-09-25.362439

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

20 (1)

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 2025SS5 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	1955-10-02 07:37	> 1 mo	0.0171367	0.0010836	1.4721599
EARTH	1958-04-10 18:52	> 1 w	0.0205550	0.0027234	0.7054017
EARTH	1972-09-26 05:38	> 1 mo	0.0758766	0.0009670	2.2064184
EARTH	1975-03-01 18:34	> 1 mo	0.1620278	0.0089937	1.0362145
EARTH	1975-05-01 14:30	> 1 mo	0.1706251	0.0008185	1.4008447
EARTH	1976-04-20 17:49	> 1 mo	0.1975866	0.0029142	1.6380902
VENUS	1981-05-28 05:35	> 1 mo	0.0475290	0.0473669	0.0240541
EARTH	1990-10-03 12:01	611.6	0.0627117	0.0012012	0.0517368
EARTH	1993-04-10 13:54	> 1 d	0.0245783	0.0026825	0.0892051
VENUS	2000-06-21 23:29	> 1 d	0.0471564	0.0451998	0.0044114
EARTH	2008-09-29 19:40	235.1	0.0122220	0.0120048	0.0000724
EARTH	2011-04-09 03:04	521.7	0.0321785	0.0095311	0.0075989
EARTH	2025-09-28 22:08	< 1 min	0.0006977	0.0006960	0.0000006
EARTH	2027-01-26 14:25	186.5	0.1945284	0.1943157	0.0000709
EARTH	2038-09-30 20:24	612.2	0.0293907	0.0077349	0.0072229
EARTH	2040-02-06 07:25	> 1 d	0.1805403	0.1783798	0.0007209
EARTH	2051-11-27 12:47	> 1 w	0.1838472	0.1593117	0.0081878
EARTH	2053-04-02 03:47	> 1 d	0.0199904	0.0028455	0.0299651
EARTH	2064-09-08 08:21	> 1 mo	0.1786233	0.0088038	0.2536140
EARTH	2064-11-10 22:53	> 1 mo	0.1622191	0.0179782	0.1676881
EARTH	2066-03-25 14:00	> 1 mo	0.1032780	0.0049801	0.3614300
EARTH	2077-10-06 03:04	> 1 mo	0.0998158	0.0024074	0.4259037
EARTH	2079-02-17 06:11	> 1 mo	0.1640791	0.0221071	0.1972834
EARTH	2079-04-24 13:45	> 1 mo	0.1819841	0.0064820	0.3016294
EARTH	2090-09-29 07:57	> 1 d	0.0210958	0.0006863	0.1104682
EARTH	2092-02-03 09:33	> 1 mo	0.1833228	0.0920112	0.0304398
EARTH	2103-11-24 22:01	> 1 mo	0.1804866	0.0204284	0.5415607
EARTH	2105-04-01 14:52	> 1 mo	0.0313557	0.0029249	1.7139406
EARTH	2116-12-05 14:07	> 1 mo	0.1953785	0.0285690	0.6657183
EARTH	2118-04-03 17:34	> 1 mo	0.0038975	0.0028639	2.5219833

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
280.95013643	265.22145037	0.00077136	MINIMUM
78.82557914	92.00783697	0.00311002	MINIMUM
359.85746839	358.57652100	0.20852352	SADDLE
179.91497622	178.64952948	0.31745571	SADDLE
359.88134930	178.60821546	1.79421678	SADDLE
179.94081212	358.67010689	2.31762316	MAXIMUM

Download:

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	TS
2061-09-29.680	74096.680	-1.906	1.42 ± 0.033	3.30E5	4.59E-7	3.35E-2	-7.56	0
2070-09-27.778	77381.778	-2.617	0.03 ± 2.025	2.48E8	9.59E-11	3.34E-2	-11.34	0
2073-09-29.760	78479.760	-1.861	1.79 ± 0.034	1.46E5	1.69E-7	3.36E-2	-8.12	0
2076-09-26.316	79572.316	-1.613	0.10 ± 0.693	9.66E7	3.69E-9	3.36E-2	-9.80	0
2076-09-28.909	79574.909	-2.427	1.78 ± 0.034	2.65E7	3.86E-10	3.35E-2	-10.79	0
2079-09-29.951	80670.951	-2.367	0.81 ± 0.055	1.55E6	5.06E-8	3.35E-2	-8.69	0
2081-03-27.456	81215.456	-2.102	1.36 ± 0.087	8.69E5	1.20E-7	3.35E-2	-8.33	0
2084-09-29.373	82497.373	-1.234	1.68 ± 0.036	7.79E6	3.09E-8	3.37E-2	-8.94	0
2084-09-29.458	82497.458	-1.873	0.22 ± 0.040	4.12E6	5.99E-8	3.37E-2	-8.66	0
2084-09-29.510	82497.510	-1.858	0.78 ± 0.035	1.32E6	1.74E-7	3.36E-2	-8.19	0
2084-09-29.554	82497.554	-1.791	1.72 ± 0.052	1.69E6	1.20E-7	3.37E-2	-8.35	0
2088-09-28.527	83957.527	-2.297	0.18 ± 1.922	2.64E6	2.06E-8	3.35E-2	-9.15	0
2089-09-29.502	84323.502	-2.908	0.25 ± 0.038	1.87E6	1.10E-8	3.35E-2	-9.43	0
2090-09-27.373	84686.373	-1.165	0.93 ± 0.095	1.15E8	5.42E-9	3.38E-2	-9.74	0
2090-09-29.624	84688.624	-2.176	0.46 ± 0.038	4.49E7	2.91E-9	3.35E-2	-10.01	0
2090-09-29.854	84688.854	-1.186	1.68 ± 0.050	8.93E6	2.79E-8	3.37E-2	-9.03	0
2090-09-29.971	84688.971	-1.246	1.72 ± 0.060	1.79E6	2.88E-7	3.37E-2	-8.02	0
2092-09-29.108	85419.108	-2.956	1.59 ± 0.038	3.44E5	2.46E-8	3.35E-2	-9.10	0
2092-09-29.144	85419.144	-2.942	1.38 ± 0.041	9.57E4	1.35E-7	3.35E-2	-8.36	0
2092-09-29.447	85419.447	-3.147	1.80 ± 0.038	6.57E4	1.47E-8	3.34E-2	-9.32	0
2093-09-27.178	85782.178	-1.010	1.79 ± 0.093	2.30E7	6.03E-9	3.37E-2	-9.71	0
2096-09-29.143	86880.143	-1.230	1.10 ± 0.038	5.12E6	1.06E-7	3.38E-2	-8.49	0
2096-09-29.405	86880.405	-2.390	1.67 ± 0.038	5.84E6	5.25E-9	3.35E-2	-9.79	0
2098-09-27.684	87608.684	-2.696	1.42 ± 0.051	9.32E5	2.53E-8	3.34E-2	-9.12	0
2098-09-29.266	87610.266	-1.159	0.97 ± 0.049	7.68E8	8.10E-10	3.37E-2	-10.62	0
2099-09-29.701	87975.701	-1.076	1.07 ± 0.058	1.07E7	6.46E-8	3.37E-2	-8.72	0
2100-03-27.652	88154.652	-1.214	0.41 ± 0.063	6.76E6	9.91E-8	3.38E-2	-8.53	0
2100-09-29.904	88340.904	-2.559	1.12 ± 0.031	4.29E5	1.01E-7	3.34E-2	-8.54	0
2100-09-30.419	88341.419	4.984	0.22 ± 0.131	3.45E5	1.65E-11	3.51E-2	-12.30	0
2103-09-30.519	89436.519	-0.588	0.44 ± 0.061	6.78E6	1.73E-7	3.39E-2	-8.31	0
2103-09-30.611	89436.611	-0.024	1.07 ± 0.047	1.62E6	7.08E-7	3.40E-2	-7.70	0
2104-09-29.073	89801.073	-0.951	1.28 ± 0.034	1.09E7	5.93E-8	3.37E-2	-8.79	0
2106-09-29.741	90531.741	-0.937	1.47 ± 0.037	1.78E7	2.95E-8	3.39E-2	-9.10	0
2107-09-28.777	90895.777	-1.010	1.31 ± 0.081	3.10E7	2.36E-8	3.37E-2	-9.20	0
2107-09-30.138	90897.138	-0.958	1.04 ± 0.037	5.83E7	1.28E-8	3.37E-2	-9.47	0
2107-09-30.294	90897.294	-0.974	0.15 ± 0.000	2.25E8	3.97E-9	3.37E-2	-9.97	0
2107-10-01.186	90898.186	-1.245	0.61 ± 0.056	6.99E7	8.92E-9	3.38E-2	-9.62	0
2108-09-27.853	91260.853	-1.008	0.09 ± 0.145	7.55E6	1.14E-7	3.39E-2	-8.52	0
2110-03-27.691	91806.691	0.255	1.74 ± 0.091	2.90E7	1.10E-8	3.40E-2	-9.54	0
2110-09-30.735	91993.735	-2.637	0.15 ± 0.653	7.38E6	5.55E-9	3.34E-2	-9.85	0
2111-09-30.275	92358.275	0.238	1.03 ± 0.045	4.74E7	2.65E-8	3.40E-2	-9.17	0
2112-09-28.228	92722.228	0.249	1.57 ± 5.726	3.09E9	8.74E-11	3.40E-2	-11.65	0
2112-09-29.080	92723.080	-2.877	0.48 ± 0.041	4.09E6	5.40E-9	3.34E-2	-9.87	0
2112-09-29.456	92723.456	-1.107	0.36 ± 0.179	3.47E8	2.20E-9	3.38E-2	-10.26	0
2114-03-27.979	93267.979	-0.619	1.41 ± 0.067	1.88E7	3.90E-8	3.39E-2	-9.01	0
2115-09-28.642	93817.642	-2.697	0.78 ± 0.054	7.84E6	4.38E-9	3.34E-2	-9.98	0
2115-09-29.838	93818.838	-1.759	0.64 ± 0.071	5.39E6	5.59E-8	3.36E-2	-8.87	0
2115-09-30.565	93819.565	-0.025	1.16 ± 0.048	3.68E7	2.98E-8	3.40E-2	-9.14	0
2115-10-01.218	93820.218	-2.387	1.14 ± 0.037	7.00E5	9.20E-8	3.35E-2	-8.65	0
2116-09-29.722	94184.722	-4.912	0.69 ± 0.201	4.69E5	1.75E-11	3.31E-2	-12.38	0
2118-09-30.163	94915.163	-0.635	1.37 ± 0.031	1.83E7	4.17E-8	3.38E-2	-9.01	0
2118-09-30.276	94915.276	0.187	1.64 ± 0.066	3.15E6	4.27E-7	3.40E-2	-7.99	0
2119-09-27.648	95277.648	2.457	1.33 ± 0.070	1.27E7	3.67E-9	3.45E-2	-10.06	0
2119-09-30.865	95280.865	-3.268	1.13 ± 0.038	1.10E6	4.90E-9	3.34E-2	-9.95	0
2120-09-27.207	95643.207	0.164	1.64 ± 0.067	3.28E7	1.72E-8	3.40E-2	-9.40	0
2120-09-29.802	95645.802	-0.642	1.59 ± 0.051	2.71E7	2.20E-8	3.39E-2	-9.29	0
2120-09-30.631	95646.631	-1.784	1.77 ± 0.057	4.28E7	1.23E-9	3.36E-2	-10.55	0
2121-09-28.775	96009.775	-0.272	0.65 ± 0.231	1.64E7	8.37E-8	3.39E-2	-8.72	0
2121-09-29.788	96010.788	-4.342	1.07 ± 0.070	2.93E6	3.56E-11	3.33E-2	-12.09	0
2122-09-30.263	96376.263	1.011	0.77 ± 0.035	3.37E7	2.30E-8	3.42E-2	-9.28	0
2122-10-01.006	96377.006	-2.067	1.45 ± 0.040	1.51E6	6.68E-8	3.35E-2	-8.82	0
2125-09-29.759	97471.759	-0.767	1.78 ± 0.027	1.04E7	1.17E-8	3.38E-2	-9.59	n/a
2125-09-29.893	97471.893	1.102	1.72 ± 0.044	1.34E6	4.01E-7	3.43E-2	-8.05	n/a


Based on 20 optical observations (of which 1 are rejected as outliers) from 2025/09/23.301 to 2025/09/25.362.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.78 and 1.80 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20250925 152706.582 UTC.

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