Asteroids

2023EM help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.834

Aphelion (Q)

1.036

Eccentricity (e)

0.108

Inclination (i)

14.2

deg

Orbit period (P)

330.2

Earth MOID

0.01956

U parameter

4.8

Next Earth close approach

Date

2032-09-27

Nominal distance (from Earth center)

0.183

27376505

Maximum Brightness

29.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.5

mag

Diameter

21 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2023-03-09

Observatory

GINOP-KHK, Piszkesteto

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

0.935030

1-sigma variation

0.000004

Unit

Eccentricity (e)

Value

0.107703

1-sigma variation

0.000041

Unit

Inclination (i)

Value

14.1753

1-sigma variation

0.0107

Unit

Long. of Ascending Node (Ω)

Value

166.6013

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

215.1558

1-sigma variation

0.0073

Unit

Mean Anomaly (M)

Value

135.18356

1-sigma variation

0.00560

Unit

Perihelion distance

Value

0.834325

1-sigma variation

Unit

Aphelion distance

Value

1.035736

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.020050

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.158450

1-sigma variation

Unit

MOID

Value

0.019564

1-sigma variation

Unit

Orbit Period

Value

330.2456

1-sigma variation

Unit

U parameter

Value

4.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.56107E-11	-1.56550E-10	-4.03970E-8	3.91414E-10	-2.74701E-8	1.77206E-8
e	-1.56550E-10	1.68314E-9	4.39332E-7	-4.48530E-9	2.97973E-7	-2.13049E-7
i	-4.03970E-8	4.39332E-7	1.14917E-4	-1.18559E-6	7.78145E-5	-5.64523E-5
Ω	3.91414E-10	-4.48530E-9	-1.18559E-6	1.30728E-8	-7.92609E-7	6.09892E-7
ω	-2.74701E-8	2.97973E-7	7.78145E-5	-7.92609E-7	5.29494E-5	-3.83786E-5
M	1.77206E-8	-2.13049E-7	-5.64523E-5	6.09892E-7	-3.83786E-5	3.13625E-5

Date of computation: 2025-09-10 00:30 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

25.481

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

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

[-]

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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

919

Unit

Source

[1]

Normalized RMS of residuals

Value

0.34348

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2023-03-09.882744

Unit

Source

[2]

Last Observation

Value

2023-03-16.85774

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

81 (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

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 2023EM 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
EARTH	1957-03-03 13:26	59.8	0.1110293	0.0972099	0.0046299
EARTH	1957-09-04 11:00	> 1 d	0.1566033	0.1563369	0.0002610
EARTH	1976-03-06 01:05	19.5	0.0208484	0.0207879	0.0000273
EARTH	1976-08-16 06:54	187.7	0.1696071	0.1693524	0.0000865
EARTH	1985-09-26 06:48	265.6	0.1811643	0.1804341	0.0002466
EARTH	1995-03-11 14:45	73.5	0.0886446	0.0867464	0.0006339
EARTH	2004-03-03 05:30	2.2	0.1196512	0.1178251	0.0006089
EARTH	2004-09-05 04:31	287.9	0.1566829	0.1564831	0.0000711
EARTH	2023-03-06 16:32	< 1 min	0.0208930	0.0208482	0.0000149
EARTH	2023-08-17 02:02	64.2	0.1693372	0.1692852	0.0000174
EARTH	2032-09-27 04:36	130.5	0.1830006	0.1828718	0.0000433
EARTH	2042-03-09 23:49	47.6	0.0704442	0.0685996	0.0006160
EARTH	2042-08-03 18:21	129.9	0.1950372	0.1941984	0.0002815
EARTH	2051-03-03 18:58	11.9	0.1362713	0.1344923	0.0005933
EARTH	2051-09-08 08:18	191.4	0.1576922	0.1576079	0.0000299
EARTH	2061-03-20 21:48	15.1	0.1968880	0.1958264	0.0003539
EARTH	2070-03-06 04:32	7.5	0.0217684	0.0216897	0.0000271
EARTH	2070-08-17 18:15	33.7	0.1671280	0.1669739	0.0000514
EARTH	2079-10-03 16:31	236.8	0.1933154	0.1929248	0.0001317
EARTH	2089-03-06 14:24	59.1	0.0222603	0.0212200	0.0004011
EARTH	2089-08-13 13:12	325.7	0.1746333	0.1734109	0.0004138
EARTH	2098-09-19 18:10	> 1 d	0.1697530	0.1665797	0.0013030
EARTH	2108-03-14 24:00	898.4	0.1317272	0.1044415	0.0092396
EARTH	2117-03-05 02:51	340.1	0.0706071	0.0388580	0.0112378
EARTH	2117-08-28 03:41	> 1 d	0.1567300	0.1559461	0.0011028

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
140.00072249	62.51156663	0.02039651	MINIMUM
321.40860403	238.00965879	0.15518659	MINIMUM
240.46579599	154.27715729	0.24840950	SADDLE
42.30980566	326.48333294	0.25769055	SADDLE
357.80056774	97.35014888	1.83218630	SADDLE
166.12731877	265.48111991	2.03168117	MAXIMUM

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MOID Plots

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