Asteroids

2023ET2 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.706

Aphelion (Q)

1.913

Eccentricity (e)

0.461

Inclination (i)

4.9

deg

Orbit period (P)

547.3

Earth MOID

0.00047

U parameter

7.7

Next Earth close approach

Date

2029-03-06

Nominal distance (from Earth center)

0.07399

11068042

Maximum Brightness

27.9

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

30.3

mag

Diameter

2.3 - 5*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2023-03-14

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.309380

1-sigma variation

0.000675

Unit

Eccentricity (e)

Value

0.460638

1-sigma variation

0.000427

Unit

Inclination (i)

Value

4.8609

1-sigma variation

0.0053

Unit

Long. of Ascending Node (Ω)

Value

351.3980

1-sigma variation

0.0052

Unit

Arg. of Perihelion (ω)

Value

94.9240

1-sigma variation

0.0268

Unit

Mean Anomaly (M)

Value

323.35163

1-sigma variation

0.54082

Unit

Perihelion distance

Value

0.706230

1-sigma variation

Unit

Aphelion distance

Value

1.912530

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.067526

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.002381

1-sigma variation

Unit

MOID

Value

0.000466

1-sigma variation

Unit

Orbit Period

Value

547.2641

1-sigma variation

Unit

U parameter

Value

7.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.55035E-7	2.67215E-7	2.56860E-6	-4.56843E-7	2.06723E-6	-3.64813E-4
e	2.67215E-7	1.82432E-7	2.10424E-6	5.53314E-7	-3.03975E-6	-2.14444E-4
i	2.56860E-6	2.10424E-6	2.84350E-5	1.66205E-5	-8.76867E-5	-2.06424E-3
Ω	-4.56843E-7	5.53314E-7	1.66205E-5	2.69337E-5	-1.39069E-4	3.59463E-4
ω	2.06723E-6	-3.03975E-6	-8.76867E-5	-1.39069E-4	7.18640E-4	-1.62218E-3
M	-3.64813E-4	-2.14444E-4	-2.06424E-3	3.59463E-4	-1.62218E-3	2.92481E-1

Date of computation: 2025-11-24 16:53 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

30.315

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

2.3 - 5*

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

0.8

Unit

Source

[1]

Unobserved

Value

1094

Unit

Source

[1]

Normalized RMS of residuals

Value

0.496319

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2023-03-14.266922

Unit

Source

[2]

Last Observation

Value

2023-03-15.11461

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

10 (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

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 2023ET2 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	1958-09-10 23:01	> 1 mo	0.0892583	0.0006176	0.8868296
EARTH	1968-09-13 05:42	> 1 mo	0.0404792	0.0010068	0.7950224
EARTH	1978-09-09 17:59	> 1 mo	0.1151692	0.0003850	0.7704563
MARS	1988-07-12 01:54	> 1 d	0.0321066	0.0264221	0.1959827
VENUS	1997-06-05 02:25	> 1 w	0.0280176	0.0267097	0.0269157
EARTH	2013-03-19 03:17	> 1 d	0.1278949	0.0011986	0.0537075
EARTH	2023-03-12 18:26	6.1	0.0010504	0.0010365	0.0000046
EARTH	2026-03-11 04:46	1416.5	0.0200488	0.0003052	0.0146382
VENUS	2027-08-01 17:13	759.7	0.0449474	0.0362821	0.0031667
EARTH	2029-03-06 19:33	834.7	0.0739853	0.0527349	0.0070840
EARTH	2032-02-29 21:37	> 1 d	0.1260337	0.0448189	0.0271114
EARTH	2035-02-17 12:05	> 1 w	0.1797451	0.0640655	0.0389602
EARTH	2070-10-14 02:53	> 1 w	0.1768568	0.0170016	0.0533635
EARTH	2073-10-04 01:13	> 1 d	0.1328902	0.0069554	0.0473106
EARTH	2076-09-28 09:26	> 1 d	0.0857531	0.0104172	0.0309601
EARTH	2079-09-26 04:15	1215.3	0.0496415	0.0217858	0.0096293
EARTH	2082-09-24 09:19	1268.8	0.0288561	0.0126182	0.0134694
EARTH	2085-09-23 19:17	> 1 d	0.0245611	0.0125560	0.0260752
EARTH	2088-09-25 02:53	> 1 d	0.0452482	0.0126107	0.0241472
EARTH	2091-09-29 08:11	1083.8	0.0866323	0.0563935	0.0101455
EARTH	2094-10-04 19:48	1276.0	0.1350131	0.1185983	0.0054718
EARTH	2097-10-15 21:48	> 1 d	0.1820784	0.1305453	0.0171800

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
58.55118963	69.47131166	0.00046622	MINIMUM
300.15675593	259.06980142	0.01212450	MINIMUM
359.07336120	343.89095152	0.28675610	SADDLE
179.65994012	164.68940339	0.90271569	SADDLE
359.21466129	164.13149484	1.72227047	SADDLE
179.76350233	344.75772732	2.89433866	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2023ET2

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2028-09-14.123	62028.123	1.538	0.653	1.31 ± 1.289	3.56E5	1.11E-9	9.19E-4	-10.45	0


Based on 10 optical observations (of which 0 are rejected as outliers) from 2023/03/14.267 to 2023/03/15.115.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.31 and 1.31 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: