Asteroids

2023ST2 help

Last update: 2025-02-19 13:28 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.613

Aphelion (Q)

3.861

Eccentricity (e)

0.726

Inclination (i)

9.6

deg

Orbit period (P)

1222.1

Earth MOID

0.00648

U parameter

8.7

Next Earth close approach

Date

2101-03-19

Nominal distance (from Earth center)

0.11721

17534678

Maximum Brightness

24.5

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.1

mag

Diameter

16 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2023-09-19

Observatory

Mt. Lemmon 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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.236978

1-sigma variation

0.011781

Unit

Eccentricity (e)

Value

0.726062

1-sigma variation

0.001648

Unit

Inclination (i)

Value

9.5755

1-sigma variation

0.0222

Unit

Long. of Ascending Node (Ω)

Value

354.9410

1-sigma variation

0.0022

Unit

Arg. of Perihelion (ω)

Value

92.7389

1-sigma variation

0.0087

Unit

Mean Anomaly (M)

Value

159.56988

1-sigma variation

1.24545

Unit

Perihelion distance

Value

0.612792

1-sigma variation

Unit

Aphelion distance

Value

3.861164

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.091044

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.027468

1-sigma variation

Unit

MOID

Value

0.006478

1-sigma variation

Unit

Orbit Period

Value

1222.0559

1-sigma variation

Unit

U parameter

Value

8.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.38799E-4	1.94176E-5	2.61620E-4	2.57095E-5	-1.02952E-4	-1.46731E-2
e	1.94176E-5	2.71646E-6	3.65998E-5	3.59668E-6	-1.44025E-5	-2.05272E-3
i	2.61620E-4	3.65998E-5	4.93128E-4	4.84607E-5	-1.94055E-4	-2.76570E-2
Ω	2.57095E-5	3.59668E-6	4.84607E-5	4.76263E-6	-1.90705E-5	-2.71787E-3
ω	-1.02952E-4	-1.44025E-5	-1.94055E-4	-1.90705E-5	7.63744E-5	1.08835E-2
M	-1.46731E-2	-2.05272E-3	-2.76570E-2	-2.71787E-3	1.08835E-2	1.55116E0

Date of computation: 2025-02-19 13:28 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

26.075

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

16 - 40*

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

[-]

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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

593

Unit

Source

[1]

Normalized RMS of residuals

Value

0.377387

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2023-09-19.258748

Unit

Source

[2]

Last Observation

Value

2023-09-24.832159

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

35 (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 2023ST2 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
VENUS	1950-02-05 16:57	> 1 mo	0.0474492	0.0450824	0.2588494
EARTH	1950-02-25 06:07	> 1 mo	0.1901647	0.0126259	0.6939186
EARTH	1966-09-19 18:16	> 1 w	0.1042494	0.0089845	0.1727232
EARTH	1997-03-05 00:21	> 1 mo	0.1211254	0.0076765	0.9130270
EARTH	2007-03-19 20:55	> 1 mo	0.1062429	0.0089604	0.8106441
EARTH	2023-09-25 00:33	< 1 s	0.0198471	0.0197149	0.0000441
VENUS	2023-11-30 20:47	158.2	0.0460972	0.0428542	0.0011269
EARTH	2101-03-19 20:03	> 1 mo	0.1172121	0.0058908	1.9732858

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
40.15351956	69.98405379	0.00667041	MINIMUM
319.21843880	260.63839834	0.01993013	MINIMUM
359.48293031	344.94069708	0.39246591	SADDLE
359.57418472	165.18010909	1.62352913	SADDLE
179.91562648	165.74629435	2.86337498	SADDLE
179.95630111	345.76488407	4.83263743	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2023ST2

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS	TS
2078-03-13.164	80105.164	0.874	0.000	0.73 ± 0.019	3.15E6	1.51E-7	1.47E-7	-7.04	0


Based on 35 optical observations (of which 0 are rejected as outliers) from 2023/09/19.259 to 2023/09/24.832.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.13 and 1.13 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20250305 084211.115 UTC.

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Download Impactor Table as: