Asteroids

2024ER4 help

Last update: 2024-04-26 23:50 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.576

Aphelion (Q)

1.083

Eccentricity (e)

0.305

Inclination (i)

2.8

deg

Orbit period (P)

276.2

Earth MOID

0.00038

U parameter

5.2

Next Earth close approach

Date

2027-02-20

Nominal distance (from Earth center)

0.09266

13862059

Maximum Brightness

23.4

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

27.3

mag

Diameter

9 - 20*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2024-03-14

Observatory

ATLAS South Africa, Sutherland

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.829928

1-sigma variation

0.000005

Unit

Eccentricity (e)

Value

0.305434

1-sigma variation

0.000036

Unit

Inclination (i)

Value

2.7550

1-sigma variation

0.0003

Unit

Long. of Ascending Node (Ω)

Value

177.3220

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

142.4646

1-sigma variation

0.0022

Unit

Mean Anomaly (M)

Value

260.59929

1-sigma variation

0.00685

Unit

Perihelion distance

Value

0.576440

1-sigma variation

Unit

Aphelion distance

Value

1.083417

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.002121

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.397873

1-sigma variation

Unit

MOID

Value

0.000384

1-sigma variation

Unit

Orbit Period

Value

276.1590

1-sigma variation

Unit

U parameter

Value

5.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.60314E-11	-1.52316E-10	-1.36331E-9	7.80307E-11	6.23294E-9	-2.57761E-8
e	-1.52316E-10	1.28237E-9	1.06315E-8	1.17241E-9	-7.22765E-8	2.42297E-7
i	-1.36331E-9	1.06315E-8	8.97872E-8	6.68052E-9	-5.69159E-7	1.97076E-6
Ω	7.80307E-11	1.17241E-9	6.68052E-9	7.41840E-9	-1.30704E-7	3.03528E-7
ω	6.23294E-9	-7.22765E-8	-5.69159E-7	-1.30704E-7	4.77044E-6	-1.45457E-5
M	-2.57761E-8	2.42297E-7	1.97076E-6	3.03528E-7	-1.45457E-5	4.69167E-5

Date of computation: 2024-04-23 10:08 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

27.342

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

9 - 20*

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 ODIM	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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.41622

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2024-03-14.972162

Unit

Source

[2]

Last Observation

Value

2024-03-16.515242

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

47 (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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2024ER4 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1950-03-01 03:28	> 1 mo	0.0894701	0.0075262	0.5951990
EARTH	1957-01-03 13:35	> 1 mo	0.0794263	0.0391600	0.6563342
EARTH	1961-03-16 02:18	> 1 w	0.1981352	0.0000986	0.7813484
EARTH	1963-12-24 02:38	> 1 w	0.1250635	0.0393995	0.4551862
EARTH	1968-03-17 12:13	915.8	0.0049636	0.0011586	0.0110659
VENUS	1973-04-15 09:37	806.8	0.0216561	0.0164040	0.0050821
EARTH	1974-12-23 00:00	249.4	0.1733437	0.1558890	0.0058361
EARTH	1979-01-23 13:33	> 1 d	0.1164138	0.1137040	0.0009102
EARTH	1983-03-18 23:40	42.7	0.0775856	0.0702704	0.0024385
VENUS	1989-08-23 21:02	191.5	0.0310850	0.0266120	0.0015188
EARTH	1989-12-20 11:47	64.7	0.0489214	0.0466913	0.0007846
EARTH	1994-02-19 00:03	> 1 d	0.1093763	0.1059748	0.0011345
EARTH	1998-03-17 01:10	106.4	0.1654570	0.1555551	0.0033006
VENUS	2004-01-18 06:13	173.8	0.0218204	0.0188282	0.0011081
EARTH	2004-12-21 14:12	93.4	0.0405702	0.0402832	0.0001414
EARTH	2009-03-06 21:33	436.0	0.0739076	0.0711674	0.0009134
EARTH	2020-01-07 17:50	170.1	0.0948807	0.0943473	0.0001780
EARTH	2024-03-17 09:12	< 1 min	0.0010822	0.0010817	0.0000002
VENUS	2026-10-28 16:15	30.1	0.0415580	0.0406727	0.0002951
EARTH	2027-02-20 23:10	83.9	0.0926621	0.0925553	0.0000356
EARTH	2030-01-18 09:51	106.7	0.0872423	0.0868817	0.0001203
EARTH	2032-12-30 07:42	10.5	0.0537379	0.0532841	0.0001533
EARTH	2036-01-01 10:09	14.7	0.1784564	0.1773809	0.0003586
VENUS	2039-06-20 13:47	38.2	0.0253950	0.0244201	0.0003287
VENUS	2049-04-23 07:19	16.4	0.0197604	0.0194172	0.0001161
EARTH	2052-03-18 19:34	3.2	0.0538359	0.0532240	0.0002040
EARTH	2055-03-01 08:55	75.0	0.0802073	0.0799028	0.0001015
EARTH	2058-01-18 06:25	60.7	0.0882276	0.0880710	0.0000522
VENUS	2059-02-25 14:08	11.4	0.0222215	0.0218170	0.0001361
EARTH	2060-12-29 07:19	4.3	0.0833648	0.0830905	0.0000915
EARTH	2074-03-17 04:47	11.8	0.1870681	0.1861744	0.0002979
VENUS	2076-01-15 20:16	33.0	0.0323362	0.0315045	0.0002772
EARTH	2077-03-17 13:56	19.2	0.0047668	0.0040939	0.0002261
EARTH	2080-03-17 14:44	480.4	0.0106128	0.0013083	0.0066496
EARTH	2083-03-19 08:43	472.2	0.0979608	0.0024972	0.0354023
EARTH	2086-03-16 22:22	> 1 d	0.1988126	0.0035216	0.0743992
VENUS	2089-04-18 12:15	> 1 w	0.0267117	0.0129700	0.1114454
VENUS	2096-12-21 00:52	> 1 d	0.0136350	0.0038970	0.0510079
VENUS	2099-10-03 10:51	> 1 w	0.0227141	0.0134315	0.1491856
VENUS	2114-03-15 16:21	> 1 mo	0.0372729	0.0039312	0.9137024
VENUS	2123-09-29 08:08	> 1 mo	0.0356751	0.0138886	0.6731851

Download as:

2024ER4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS	TS
2109-03-18.547	91432.547	2.340	0.000	1.45 ± 0.722	6.73E6	7.65E-9	4.13E-10	-9.54	0


Based on 47 optical observations (of which 0 are rejected as outliers) from 2024/03/14.972 to 2024/03/16.515.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.72 and 1.72 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20240318 142355.904 UTC.

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