Asteroids

2023ER1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.754

Aphelion (Q)

3.153

Eccentricity (e)

0.614

Inclination (i)

5.7

deg

Orbit period (P)

997.5

Earth MOID

0.00566

U parameter

8.5

Next Earth close approach

Date

2044-10-25

Nominal distance (from Earth center)

0.06757

10107844

Maximum Brightness

24.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.6

mag

Diameter

8 - 18*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2023-03-13

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

1.953800

1-sigma variation

0.005627

Unit

Eccentricity (e)

Value

0.613967

1-sigma variation

0.001269

Unit

Inclination (i)

Value

5.7226

1-sigma variation

0.0102

Unit

Long. of Ascending Node (Ω)

Value

171.9788

1-sigma variation

0.0007

Unit

Arg. of Perihelion (ω)

Value

288.1220

1-sigma variation

0.0014

Unit

Mean Anomaly (M)

Value

11.80021

1-sigma variation

1.62531

Unit

Perihelion distance

Value

0.754232

1-sigma variation

Unit

Aphelion distance

Value

3.153369

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.027257

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.498327

1-sigma variation

Unit

MOID

Value

0.005655

1-sigma variation

Unit

Orbit Period

Value

997.5132

1-sigma variation

Unit

U parameter

Value

8.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.16671E-5	7.13920E-6	5.76485E-5	-3.80971E-6	6.74069E-6	-9.14619E-3
e	7.13920E-6	1.60951E-6	1.29965E-5	-8.58864E-7	1.51772E-6	-2.06197E-3
i	5.76485E-5	1.29965E-5	1.04949E-4	-6.93554E-6	1.22951E-5	-1.66502E-2
Ω	-3.80971E-6	-8.58864E-7	-6.93554E-6	4.58452E-7	-8.14878E-7	1.10033E-3
ω	6.74069E-6	1.51772E-6	1.22951E-5	-8.14878E-7	1.85683E-6	-1.94689E-3
M	-9.14619E-3	-2.06197E-3	-1.66502E-2	1.10033E-3	-1.94689E-3	2.64163E0

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

27.568

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

8 - 18*

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

979

Unit

Source

[1]

Normalized RMS of residuals

Value

0.62509

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2023-03-13.264895

Unit

Source

[2]

Last Observation

Value

2023-03-18.545296

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

18 (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 2023ER1 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	2004-02-23 11:05	> 1 mo	0.1209235	0.0014460	0.3792278
EARTH	2014-10-18 01:14	> 1 w	0.1021306	0.0610210	0.1759744
EARTH	2023-03-10 06:43	< 1 min	0.0095411	0.0094865	0.0000182
4 Vesta	2039-12-18 19:27	> 1 d	0.0074691	0.0072968	0.0525609
EARTH	2044-10-25 18:13	> 1 mo	0.0675668	0.0643633	0.1524489
EARTH	2064-03-09 03:44	> 1 mo	0.0044221	0.0039130	0.6295525
EARTH	2074-10-25 07:52	> 1 mo	0.0674198	0.0670547	18.7567348
EARTH	2083-03-20 02:22	> 1 mo	0.1445829	0.0001612	436.0144801
EARTH	2093-11-12 08:15	> 1 mo	0.1591919	0.0645391	453.9050423

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
36.89304024	65.61415451	0.00579309	MINIMUM
322.42283561	288.96279981	0.06254715	MINIMUM
359.02811476	356.03911980	0.24364164	SADDLE
359.80936879	177.61086816	1.76862094	SADDLE
179.88288334	177.88064996	2.14364100	SADDLE
180.03836843	357.95774656	4.13349238	MAXIMUM

Download:

MOID Plots

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