Asteroids

2025SA21 help

Last update: 2025-09-30 11:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.859

Aphelion (Q)

1.378

Eccentricity (e)

0.232

Inclination (i)

8.8

deg

Orbit period (P)

432.2

Earth MOID

0.02325

U parameter

7.4

Next Earth close approach

Date

2025-10-09

Nominal distance (from Earth center)

0.02378

3557167

Maximum Brightness

20.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.4

mag

Diameter

14 - 30*

Taxonomic type

Rotation period (T)

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

1.118733

1-sigma variation

0.000293

Unit

Eccentricity (e)

Value

0.231829

1-sigma variation

0.000563

Unit

Inclination (i)

Value

8.7854

1-sigma variation

0.0127

Unit

Long. of Ascending Node (Ω)

Value

9.1214

1-sigma variation

0.0012

Unit

Arg. of Perihelion (ω)

Value

85.7710

1-sigma variation

0.0592

Unit

Mean Anomaly (M)

Value

341.87770

1-sigma variation

0.02539

Unit

Perihelion distance

Value

0.859378

1-sigma variation

Unit

Aphelion distance

Value

1.378087

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.039621

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.077101

1-sigma variation

Unit

MOID

Value

0.023249

1-sigma variation

Unit

Orbit Period

Value

432.2032

1-sigma variation

Unit

U parameter

Value

7.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.56290E-8	1.00674E-7	3.58006E-6	2.39584E-7	-1.44311E-6	7.35272E-6
e	1.00674E-7	3.17174E-7	5.75926E-6	-8.43966E-8	2.45959E-5	7.03472E-6
i	3.58006E-6	5.75926E-6	1.61882E-4	7.16435E-6	1.44799E-4	2.94747E-4
Ω	2.39584E-7	-8.43966E-8	7.16435E-6	1.34764E-6	-5.24374E-5	2.35223E-5
ω	-1.44311E-6	2.45959E-5	1.44799E-4	-5.24374E-5	3.50167E-3	-3.36986E-4
M	7.35272E-6	7.03472E-6	2.94747E-4	2.35223E-5	-3.36986E-4	6.44547E-4

Date of computation: 2025-09-30 11:30 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

26.387

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

14 - 30*

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

0.9

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.426838

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-09-29.431637

Unit

Source

[2]

Last Observation

Value

2025-09-30.324512

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

23 (0)

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 2025SA21 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	1954-10-07 12:32	> 1 w	0.0388061	0.0207560	0.4386791
EARTH	1962-03-18 21:39	> 1 w	0.0890570	0.0463508	0.2511919
EARTH	1967-10-09 16:30	> 1 d	0.0217254	0.0216370	0.0009947
EARTH	1975-03-21 02:40	634.4	0.1284854	0.0775330	0.0177312
EARTH	1980-10-11 12:38	> 1 d	0.0509251	0.0211916	0.0525381
EARTH	1993-12-08 16:57	> 1 mo	0.1810911	0.1287811	0.0205689
EARTH	2007-03-15 12:00	> 1 d	0.1057895	0.0456508	0.0504316
EARTH	2012-10-02 02:39	> 1 d	0.1405716	0.0266076	0.0398283
EARTH	2020-03-16 12:59	711.0	0.0495327	0.0449177	0.0058732
EARTH	2025-10-09 06:09	8.3	0.0237571	0.0236507	0.0000355
EARTH	2033-03-22 02:10	828.7	0.1529359	0.1067578	0.0156581
EARTH	2038-10-15 16:26	> 1 d	0.0995795	0.0229601	0.0276166
EARTH	2052-01-03 10:14	> 1 w	0.1869488	0.1789138	0.0026811
EARTH	2065-03-14 21:47	697.5	0.0730618	0.0427980	0.0252696
EARTH	2070-10-04 04:24	> 1 d	0.1165272	0.0396304	0.0266150
EARTH	2078-03-17 09:09	735.9	0.0472802	0.0432486	0.0045424
EARTH	2083-10-09 02:15	646.8	0.0336628	0.0247300	0.0061967
EARTH	2091-03-19 23:56	235.8	0.0803974	0.0767237	0.0012380
EARTH	2096-10-09 06:04	214.4	0.0270446	0.0254445	0.0010376
EARTH	2104-03-20 04:07	965.0	0.0687588	0.0385450	0.0179898
EARTH	2109-10-09 11:19	> 1 d	0.0440994	0.0258792	0.0212437
EARTH	2117-03-18 16:34	443.2	0.0389541	0.0383793	0.0002132
EARTH	2122-10-05 07:27	711.3	0.1362031	0.1025101	0.0112927

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
294.04868933	275.68269754	0.02322826	MINIMUM
67.83591346	73.67679857	0.04338214	MINIMUM
1.51901140	355.60052367	0.18784020	SADDLE
180.68850986	174.03912861	0.40319946	SADDLE
359.66474142	173.27570709	1.87175114	SADDLE
179.44579855	353.03675232	2.35524606	MAXIMUM

Download:

MOID Plots

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