Asteroids

2025SD4 help

Last update: 2025-09-26 13:16 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.649

Aphelion (Q)

2.224

Eccentricity (e)

0.548

Inclination (i)

21.1

deg

Orbit period (P)

628.9

Earth MOID

0.00493

U parameter

8.4

Next Earth close approach

Date

2043-03-29

Nominal distance (from Earth center)

0.10039

15017714

Maximum Brightness

24.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

17 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-22

Observatory

GINOP-KHK, Piszkesteto

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

1.436497

1-sigma variation

0.002561

Unit

Eccentricity (e)

Value

0.548191

1-sigma variation

0.000972

Unit

Inclination (i)

Value

21.0921

1-sigma variation

0.0358

Unit

Long. of Ascending Node (Ω)

Value

182.3646

1-sigma variation

0.0008

Unit

Arg. of Perihelion (ω)

Value

271.6529

1-sigma variation

0.0265

Unit

Mean Anomaly (M)

Value

1.12511

1-sigma variation

0.02421

Unit

Perihelion distance

Value

0.649023

1-sigma variation

Unit

Aphelion distance

Value

2.223971

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.008685

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.017686

1-sigma variation

Unit

MOID

Value

0.004926

1-sigma variation

Unit

Orbit Period

Value

628.8620

1-sigma variation

Unit

U parameter

Value

8.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.55686E-6	2.48947E-6	9.15697E-5	2.06011E-6	-6.77827E-5	6.19997E-5
e	2.48947E-6	9.45188E-7	3.47667E-5	7.82174E-7	-2.57351E-5	2.35397E-5
i	9.15697E-5	3.47667E-5	1.27882E-3	2.87705E-5	-9.46616E-4	8.65856E-4
Ω	2.06011E-6	7.82174E-7	2.87705E-5	6.47279E-7	-2.12965E-5	1.94798E-5
ω	-6.77827E-5	-2.57351E-5	-9.46616E-4	-2.12965E-5	7.00749E-4	-6.40932E-4
M	6.19997E-5	2.35397E-5	8.65856E-4	1.94798E-5	-6.40932E-4	5.86250E-4

Date of computation: 2025-09-26 13:16 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

25.981

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

17 - 40*

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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.540896

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-20.359514

Unit

Source

[2]

Last Observation

Value

2025-09-26.101558

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

43 (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 2025SD4 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	1959-03-26 14:15	> 1 mo	0.0583850	0.0012889	238.0298231
EARTH	1971-03-18 05:41	> 1 mo	0.1060959	0.0026336	168.6262285
EARTH	1977-10-03 11:17	> 1 mo	0.1382758	0.0017415	99.2325204
EARTH	1989-09-24 20:09	> 1 mo	0.0281825	0.0038981	42.6941950
EARTH	2012-03-23 07:20	> 1 w	0.0035398	0.0018501	0.1921673
EARTH	2025-09-26 11:49	< 1 s	0.0117003	0.0116404	0.0000200
EARTH	2043-03-29 04:29	> 1 w	0.1003872	0.0068534	0.2659931
EARTH	2056-09-23 22:55	> 1 w	0.0570089	0.0114655	0.3219805
EARTH	2074-03-24 17:14	> 1 d	0.0150583	0.0073882	0.0900540
EARTH	2087-09-28 15:15	> 1 w	0.0255969	0.0144514	0.3705856
EARTH	2093-03-19 21:09	> 1 w	0.0729378	0.0094642	0.3557293
EARTH	2106-09-27 12:52	> 1 d	0.0225665	0.0151342	0.0836735
EARTH	2112-03-14 03:43	> 1 w	0.1806985	0.0204563	0.2492309

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
55.92279640	80.68416518	0.00492605	MINIMUM
302.93822615	263.23997976	0.00977490	MINIMUM
359.26731796	351.61301050	0.44443034	SADDLE
179.67133205	172.57847277	1.32565182	SADDLE
359.53957859	172.14590828	1.64029015	SADDLE
180.02254897	352.78557699	3.16167962	MAXIMUM

Download:

MOID Plots

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