Asteroids

2025SZ4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.755

Aphelion (Q)

1.408

Eccentricity (e)

0.302

Inclination (i)

28.1

deg

Orbit period (P)

410.7

Earth MOID

0.00984

U parameter

6.9

Next Earth close approach

Date

2033-03-29

Nominal distance (from Earth center)

0.18738

28031085

Maximum Brightness

23.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

40 - 90*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-23

Observatory

ATLAS South Africa, Sutherland

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

1.081357

1-sigma variation

0.000141

Unit

Eccentricity (e)

Value

0.301701

1-sigma variation

0.000098

Unit

Inclination (i)

Value

28.0704

1-sigma variation

0.0083

Unit

Long. of Ascending Node (Ω)

Value

1.5122

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

263.8978

1-sigma variation

0.0134

Unit

Mean Anomaly (M)

Value

111.98067

1-sigma variation

0.03352

Unit

Perihelion distance

Value

0.755110

1-sigma variation

Unit

Aphelion distance

Value

1.407604

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.011982

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.045228

1-sigma variation

Unit

MOID

Value

0.009844

1-sigma variation

Unit

Orbit Period

Value

410.7258

1-sigma variation

Unit

U parameter

Value

6.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.99493E-8	1.38595E-8	1.17736E-6	1.48764E-8	1.89569E-6	-4.73422E-6
e	1.38595E-8	9.63008E-9	8.18091E-7	1.03369E-8	1.31685E-6	-3.28905E-6
i	1.17736E-6	8.18091E-7	6.95246E-5	8.78428E-7	1.11863E-4	-2.79403E-4
Ω	1.48764E-8	1.03369E-8	8.78428E-7	1.11001E-8	1.41343E-6	-3.53037E-6
ω	1.89569E-6	1.31685E-6	1.11863E-4	1.41343E-6	1.80156E-4	-4.49869E-4
M	-4.73422E-6	-3.28905E-6	-2.79403E-4	-3.53037E-6	-4.49869E-4	1.12349E-3

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

24.027

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

[-]

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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

0.83687

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-23.03143

Unit

Source

[2]

Last Observation

Value

2025-09-25.031943

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

82 (3)

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 2025SZ4 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	1954-09-24 13:41	1333.8	0.0174342	0.0108871	0.0213164
EARTH	1963-09-27 17:49	> 1 d	0.0960143	0.0101803	0.0331473
EARTH	1988-03-13 02:50	> 1 d	0.1481027	0.0730125	0.0261393
EARTH	1997-03-18 09:35	> 1 d	0.0498590	0.0358458	0.0158754
EARTH	2006-03-22 04:58	1207.3	0.0540039	0.0358918	0.0133944
EARTH	2007-09-19 18:29	545.0	0.1590048	0.1082686	0.0169278
EARTH	2015-03-26 14:00	765.5	0.1309059	0.0982904	0.0110533
EARTH	2016-09-21 08:12	453.0	0.0758608	0.0448866	0.0103892
EARTH	2025-09-23 18:44	< 1 s	0.0126454	0.0126342	0.0000037
EARTH	2034-09-23 18:27	500.7	0.0187624	0.0103232	0.0087236
EARTH	2042-03-26 13:16	85.3	0.1354219	0.1317518	0.0012248
EARTH	2043-09-21 15:40	12.1	0.0923304	0.0916147	0.0002385
EARTH	2051-03-22 21:03	644.8	0.0625239	0.0439265	0.0074069
EARTH	2052-09-18 21:10	289.0	0.1704016	0.1404592	0.0099849
EARTH	2060-03-18 16:18	1247.6	0.0444882	0.0381773	0.0094920
EARTH	2069-03-14 06:02	> 1 d	0.1296650	0.0477295	0.0311377
EARTH	2089-09-30 03:35	> 1 d	0.1646325	0.0168325	0.0497524
EARTH	2098-09-26 12:58	> 1 d	0.0604984	0.0093075	0.0504198
EARTH	2107-09-25 04:47	1171.3	0.0184736	0.0096595	0.0207645
EARTH	2115-03-24 23:03	> 1 d	0.0793248	0.0407300	0.0424065
EARTH	2116-09-20 05:49	> 1 d	0.1593226	0.0091857	0.0580339
EARTH	2124-03-17 15:19	> 1 d	0.0793918	0.0385638	0.1100813

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
77.65759923	260.57701936	0.00984801	MINIMUM
290.89881716	76.95165550	0.03791890	MINIMUM
4.19162395	169.52535285	0.49981008	SADDLE
184.40120419	347.14493363	0.71008253	SADDLE
2.41518481	346.71777157	1.68843770	SADDLE
178.22011497	162.10061412	2.35587718	MAXIMUM

Download:

MOID Plots

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