Asteroids

2023SJ help

Last update: 2026-07-30 14:25 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.776

Aphelion (Q)

3.298

Eccentricity (e)

0.619

Inclination (i)

13.7

deg

Orbit period (P)

1061.6

Earth MOID

0.04197

U parameter

8.2

Next Earth close approach

Date

2055-09-13

Nominal distance (from Earth center)

0.1302

19477248

Maximum Brightness

22.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.1

mag

Diameter

40 - 90*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2023-09-16

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.036568

1-sigma variation

0.004738

Unit

Eccentricity (e)

Value

0.619192

1-sigma variation

0.000968

Unit

Inclination (i)

Value

13.6802

1-sigma variation

0.0186

Unit

Long. of Ascending Node (Ω)

Value

348.3461

1-sigma variation

0.0008

Unit

Arg. of Perihelion (ω)

Value

77.5136

1-sigma variation

0.0065

Unit

Mean Anomaly (M)

Value

320.83133

1-sigma variation

1.10967

Unit

Perihelion distance

Value

0.775541

1-sigma variation

Unit

Aphelion distance

Value

3.297594

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.100281

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.457105

1-sigma variation

Unit

MOID

Value

0.041968

1-sigma variation

Unit

Orbit Period

Value

1061.5653

1-sigma variation

Unit

U parameter

Value

8.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.24455E-5	4.58374E-6	8.81270E-5	-3.60440E-6	-3.09693E-5	-5.25725E-3
e	4.58374E-6	9.36076E-7	1.79970E-5	-7.36087E-7	-6.32436E-6	-1.07362E-3
i	8.81270E-5	1.79970E-5	3.46043E-4	-1.41428E-5	-1.21606E-4	-2.06414E-2
Ω	-3.60440E-6	-7.36087E-7	-1.41428E-5	5.81485E-7	4.96868E-6	8.44232E-4
ω	-3.09693E-5	-6.32436E-6	-1.21606E-4	4.96868E-6	4.27548E-5	7.25371E-3
M	-5.25725E-3	-1.07362E-3	-2.06414E-2	8.44232E-4	7.25371E-3	1.23137E0

Date of computation: 2026-07-30 14:25 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

24.131

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

40 - 90*

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

1049

Unit

Source

[1]

Normalized RMS of residuals

Value

0.539777

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2023-09-16.146296

Unit

Source

[2]

Last Observation

Value

2023-09-21.226698

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

83 (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 2023SJ 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	1965-09-09 21:37	> 1 mo	0.1559307	0.0274907	0.8377763
EARTH	2023-09-21 11:22	< 1 min	0.0432736	0.0430924	0.0000604
EARTH	2055-09-13 10:24	> 1 mo	0.1301974	0.0459511	0.6786284
EARTH	2084-09-22 03:54	> 1 mo	0.0612145	0.0484680	0.3441370
EARTH	2113-09-19 01:08	> 1 mo	0.0526939	0.0486613	0.2680545

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
323.46389740	253.61634216	0.04196780	MINIMUM
37.16718678	31.19086294	0.13806528	MINIMUM
2.07526518	326.19469685	0.29437954	SADDLE
359.51692581	140.89280295	1.77674714	SADDLE
180.15595223	140.99414520	2.32372422	SADDLE
179.56006990	320.70125207	4.26420449	MAXIMUM

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MOID Plots

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