Asteroids

2025SN4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.605

Aphelion (Q)

1.051

Eccentricity (e)

0.270

Inclination (i)

18.1

deg

Orbit period (P)

275.2

Earth MOID

0.00228

U parameter

6.5

Next Earth close approach

Date

2028-09-20

Nominal distance (from Earth center)

0.0738

11040529

Maximum Brightness

23.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

20 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-09-22

Observatory

ATLAS Chile, Rio Hurtado

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

0.828028

1-sigma variation

0.000037

Unit

Eccentricity (e)

Value

0.269625

1-sigma variation

0.000110

Unit

Inclination (i)

Value

18.0985

1-sigma variation

0.0124

Unit

Long. of Ascending Node (Ω)

Value

178.5260

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

28.2382

1-sigma variation

0.0060

Unit

Mean Anomaly (M)

Value

213.34629

1-sigma variation

0.01275

Unit

Perihelion distance

Value

0.604771

1-sigma variation

Unit

Aphelion distance

Value

1.051285

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.376288

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.002647

1-sigma variation

Unit

MOID

Value

0.002276

1-sigma variation

Unit

Orbit Period

Value

275.2111

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.36037E-9	-4.00940E-9	-4.51256E-7	-4.77725E-9	-2.00610E-7	4.29727E-7
e	-4.00940E-9	1.20006E-8	1.35782E-6	1.48304E-8	6.26842E-7	-1.33659E-6
i	-4.51256E-7	1.35782E-6	1.53928E-4	1.69865E-6	7.19357E-5	-1.53160E-4
Ω	-4.77725E-9	1.48304E-8	1.69865E-6	1.98998E-8	8.49886E-7	-1.79541E-6
ω	-2.00610E-7	6.26842E-7	7.19357E-5	8.49886E-7	3.64776E-5	-7.69429E-5
M	4.29727E-7	-1.33659E-6	-1.53160E-4	-1.79541E-6	-7.69429E-5	1.62466E-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

25.572

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

20 - 50*

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

0.744827

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-22.378553

Unit

Source

[2]

Last Observation

Value

2025-09-23.5856

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

22 (2)

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 2025SN4 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	1972-09-29 21:35	> 1 mo	0.1378059	0.0368740	0.3378369
EARTH	1975-09-24 12:52	> 1 w	0.0668366	0.0085395	0.2001703
EARTH	1978-09-21 13:14	348.3	0.0035930	0.0029943	0.0061097
EARTH	1981-09-21 17:21	207.6	0.1748641	0.1474123	0.0091566
EARTH	2000-09-27 12:25	725.4	0.1184128	0.1012910	0.0057337
EARTH	2003-09-21 06:16	85.6	0.0429795	0.0172448	0.0086396
EARTH	2022-10-03 20:31	189.9	0.1700819	0.1669769	0.0010368
EARTH	2025-09-21 11:39	< 1 min	0.0048210	0.0048116	0.0000031
EARTH	2028-09-20 08:45	3.4	0.0738014	0.0703762	0.0011419
EARTH	2031-09-21 23:00	40.8	0.1614341	0.1549180	0.0021724
EARTH	2065-10-03 21:25	1367.7	0.1703700	0.1444529	0.0087542
EARTH	2068-09-25 18:59	1032.9	0.0964512	0.0666005	0.0100171
EARTH	2071-09-22 13:51	492.3	0.0226832	0.0028165	0.0103230
EARTH	2074-09-21 03:32	7.6	0.0315955	0.0273859	0.0014041
EARTH	2077-09-20 20:19	163.3	0.1062254	0.0678140	0.0128244
EARTH	2080-09-21 19:53	620.4	0.1897942	0.1193784	0.0235113
EARTH	2117-10-01 17:06	> 1 w	0.1452398	0.0414653	0.1044210
EARTH	2120-09-25 10:51	> 1 w	0.0771482	0.0101949	0.1161788
EARTH	2123-09-23 07:15	> 1 d	0.0120948	0.0020048	0.1124086

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
143.03708651	257.98477107	0.00227566	MINIMUM
28.73462154	140.61997892	0.44528409	SADDLE
11.53253492	297.71803421	1.59304992	SADDLE
179.15646425	104.57215958	2.05084221	MAXIMUM

Download:

MOID Plots

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