Asteroids

2026SQ31 help

Last update: 2026-10-21 19:15 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.827

Aphelion (Q)

1.300

Eccentricity (e)

0.223

Inclination (i)

8.6

deg

Orbit period (P)

400.3

Earth MOID

0.01259

U parameter

6.7

Next Earth close approach

Date

2028-04-17

Nominal distance (from Earth center)

0.02686

4017710

Maximum Brightness

17.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.7

mag

Diameter

50 - 110*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-28

Observatory

Pan-STARRS 2, Haleakala

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

1.063033

1-sigma variation

0.000099

Unit

Eccentricity (e)

Value

0.222500

1-sigma variation

0.000142

Unit

Inclination (i)

Value

8.5952

1-sigma variation

0.0053

Unit

Long. of Ascending Node (Ω)

Value

36.3267

1-sigma variation

0.0006

Unit

Arg. of Perihelion (ω)

Value

79.7029

1-sigma variation

0.0048

Unit

Mean Anomaly (M)

Value

356.13892

1-sigma variation

0.01138

Unit

Perihelion distance

Value

0.826508

1-sigma variation

Unit

Aphelion distance

Value

1.299559

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.020798

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.046941

1-sigma variation

Unit

MOID

Value

0.012592

1-sigma variation

Unit

Orbit Period

Value

400.3306

1-sigma variation

Unit

U parameter

Value

6.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.86661E-9	1.41260E-8	5.21907E-7	6.22447E-8	-4.71864E-7	1.13042E-6
e	1.41260E-8	2.02250E-8	7.47260E-7	8.90396E-8	-6.75398E-7	1.61843E-6
i	5.21907E-7	7.47260E-7	2.76097E-5	3.28760E-6	-2.49501E-5	5.97957E-5
Ω	6.22447E-8	8.90396E-8	3.28760E-6	4.03552E-7	-2.99466E-6	7.12961E-6
ω	-4.71864E-7	-6.75398E-7	-2.49501E-5	-2.99466E-6	2.26019E-5	-5.40593E-5
M	1.13042E-6	1.61843E-6	5.97957E-5	7.12961E-6	-5.40593E-5	1.29513E-4

Date of computation: 2026-10-21 19:15 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

23.696

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

50 - 110*

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

0.503151

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-28.514223

Unit

Source

[2]

Last Observation

Value

2026-10-20.548431

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

44 (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

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 2026SQ31 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	1958-11-25 15:42	> 1 mo	0.1489180	0.0703961	0.0754270
EARTH	1960-04-23 03:15	> 1 d	0.1400997	0.0256619	0.0957486
EARTH	1969-10-14 10:51	> 1 d	0.1909569	0.0395794	0.0518630
EARTH	1971-02-18 14:16	> 1 w	0.1940581	0.1461909	0.0164678
EARTH	1971-05-10 01:22	> 1 w	0.1957618	0.1064928	0.0329482
EARTH	1981-10-28 20:55	> 1 d	0.0455307	0.0169440	0.0207898
EARTH	1983-04-19 18:10	1315.1	0.0468370	0.0274005	0.0208178
EARTH	1992-10-17 03:57	> 1 d	0.1405826	0.0668589	0.0248033
EARTH	1994-04-21 20:28	> 1 d	0.1363594	0.0742672	0.0214099
EARTH	2004-12-28 02:09	> 1 d	0.1945857	0.1863143	0.0028083
EARTH	2015-10-29 05:39	1062.7	0.0406448	0.0202376	0.0075214
EARTH	2017-04-19 15:43	445.3	0.0620541	0.0407069	0.0076745
EARTH	2026-10-25 13:21	< 1 min	0.0155237	0.0154926	0.0000104
EARTH	2028-04-17 23:19	17.8	0.0268567	0.0265333	0.0001342
EARTH	2049-10-28 17:21	> 1 d	0.0389624	0.0134048	0.0258644
EARTH	2051-04-20 05:57	1364.2	0.0573407	0.0284509	0.0165853
EARTH	2060-10-22 00:10	> 1 d	0.0642737	0.0123509	0.0452979
EARTH	2062-04-17 10:45	884.7	0.0544110	0.0260899	0.0428460
EARTH	2083-11-03 18:57	1097.7	0.0868812	0.0701251	0.0056224
EARTH	2085-04-21 17:53	465.7	0.1025051	0.0838290	0.0062803
EARTH	2094-10-22 09:35	> 1 d	0.0657655	0.0124152	0.0278318
EARTH	2096-04-16 23:52	531.4	0.0596974	0.0238743	0.0218796
EARTH	2117-10-26 21:34	> 1 d	0.0117175	0.0116371	0.0044687
EARTH	2119-04-19 21:13	> 1 d	0.0255367	0.0252490	0.0336009

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
288.98791275	290.34377646	0.01259207	MINIMUM
79.05360900	104.24996019	0.02655269	MINIMUM
4.67355952	18.53148608	0.20683822	SADDLE
183.33674442	195.84221095	0.33194941	SADDLE
1.70587327	194.82995798	1.83602656	SADDLE
180.28003344	13.34279580	2.27716774	MAXIMUM

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MOID Plots

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