Asteroids

2026SD3 help

Last update: 2026-09-24 12:45 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.856

Aphelion (Q)

1.416

Eccentricity (e)

0.247

Inclination (i)

32.7

deg

Orbit period (P)

442.2

Earth MOID

0.01083

U parameter

7.7

Next Earth close approach

Date

2037-03-23

Nominal distance (from Earth center)

0.12746

19067537

Maximum Brightness

22.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

21 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-21

Observatory

University of Arizona Catalina Sky 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

61400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.135992

1-sigma variation

0.000463

Unit

Eccentricity (e)

Value

0.246909

1-sigma variation

0.000268

Unit

Inclination (i)

Value

32.7124

1-sigma variation

0.0220

Unit

Long. of Ascending Node (Ω)

Value

358.4727

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

281.9711

1-sigma variation

0.0514

Unit

Mean Anomaly (M)

Value

129.53625

1-sigma variation

0.11692

Unit

Perihelion distance

Value

0.855506

1-sigma variation

Unit

Aphelion distance

Value

1.416479

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.011886

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.129397

1-sigma variation

Unit

MOID

Value

0.010832

1-sigma variation

Unit

Orbit Period

Value

442.2434

1-sigma variation

Unit

U parameter

Value

7.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.14175E-7	1.23899E-7	1.01857E-5	1.71160E-7	2.37835E-5	-5.41093E-5
e	1.23899E-7	7.16788E-8	5.89250E-6	9.90168E-8	1.37581E-5	-3.13019E-5
i	1.01857E-5	5.89250E-6	4.84742E-4	8.14590E-6	1.13104E-3	-2.57330E-3
Ω	1.71160E-7	9.90168E-8	8.14590E-6	1.36890E-7	1.90060E-5	-4.32414E-5
ω	2.37835E-5	1.37581E-5	1.13104E-3	1.90060E-5	2.64121E-3	-6.00872E-3
M	-5.41093E-5	-3.13019E-5	-2.57330E-3	-4.32414E-5	-6.00872E-3	1.36702E-2

Date of computation: 2026-09-24 12:45 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

25.563

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

21 - 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

0.631938

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-21.369627

Unit

Source

[2]

Last Observation

Value

2026-09-22.899352

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

39 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2026SD3 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1957-03-22 14:21	> 1 d	0.1349549	0.1114478	0.1315629
EARTH	1969-09-21 16:06	> 1 d	0.0202564	0.0103946	0.1026249
EARTH	1980-03-24 01:36	721.0	0.1370702	0.1163256	0.0587921
EARTH	1986-09-17 14:13	> 1 d	0.1058907	0.0090615	0.1167303
EARTH	1997-03-23 02:26	> 1 d	0.1272108	0.1152528	0.0370958
EARTH	2009-09-25 20:40	> 1 d	0.1258538	0.0080317	0.0614350
EARTH	2026-09-21 02:20	< 1 s	0.0137299	0.0136998	0.0000100
EARTH	2037-03-23 03:01	860.0	0.1274586	0.1153291	0.0163634
EARTH	2049-09-21 18:52	> 1 d	0.0169867	0.0096176	0.0700056
EARTH	2060-03-24 06:05	967.8	0.1303392	0.1131426	0.0462622
EARTH	2066-09-17 05:40	> 1 w	0.1229306	0.0079585	0.2272698
EARTH	2077-03-23 00:06	> 1 d	0.1412454	0.1183207	0.1975890
EARTH	2089-09-25 00:29	> 1 w	0.0974150	0.0083795	0.5459842
EARTH	2100-03-25 11:44	> 1 d	0.1803688	0.1213463	0.3677514
EARTH	2106-09-21 10:24	> 1 w	0.0357410	0.0091854	0.4936566
EARTH	2117-03-24 18:45	> 1 d	0.1211485	0.1174616	0.0603372

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
63.95886336	255.98946062	0.01083205	MINIMUM
277.80943235	79.22858874	0.11468866	MINIMUM
350.85833479	165.46508609	0.54832656	SADDLE
170.19299836	350.79476712	0.78860554	SADDLE
355.61799935	352.88036146	1.76664334	SADDLE
190.58292793	189.02194811	2.34349070	MAXIMUM

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MOID Plots

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