Asteroids

2024YR4 help

Last update: 2025-09-10 09:04 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.852

Aphelion (Q)

4.180

Eccentricity (e)

0.661

Inclination (i)

3.4

deg

Orbit period (P)

1457.5

Earth MOID

0.00280

U parameter

3.6

Next Earth close approach

Date

2028-12-17

Nominal distance (from Earth center)

0.05357

8014400

Maximum Brightness

22.7

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2024-12-27

Observatory

ATLAS Chile, Rio Hurtado

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

2.515837

1-sigma variation

0.000008

Unit

Eccentricity (e)

Value

0.661472

1-sigma variation

0.000001

Unit

Inclination (i)

Value

3.4082

1-sigma variation

4.315E-6

Unit

Long. of Ascending Node (Ω)

Value

271.3638

1-sigma variation

7.727E-6

Unit

Arg. of Perihelion (ω)

Value

134.3660

1-sigma variation

8.771E-6

Unit

Mean Anomaly (M)

Value

89.80751

1-sigma variation

0.00044

Unit

Perihelion distance

Value

0.851681

1-sigma variation

Unit

Aphelion distance

Value

4.179994

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.612757

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.015973

1-sigma variation

Unit

MOID

Value

0.002803

1-sigma variation

Unit

Orbit Period

Value

1457.5459

1-sigma variation

Unit

U parameter

Value

3.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.76135E-11	9.64117E-12	3.45521E-11	-2.69839E-13	-3.35532E-11	-3.64858E-9
e	9.64117E-12	1.37487E-12	4.92970E-12	-6.65003E-16	-4.84781E-12	-5.20259E-10
i	3.45521E-11	4.92970E-12	1.86217E-11	5.13462E-12	-2.22975E-11	-1.86474E-9
Ω	-2.69839E-13	-6.65003E-16	5.13462E-12	5.97048E-11	-5.39104E-11	1.04361E-11
ω	-3.35532E-11	-4.84781E-12	-2.22975E-11	-5.39104E-11	7.69272E-11	1.81305E-9
M	-3.64858E-9	-5.20259E-10	-1.86474E-9	1.04361E-11	1.81305E-9	1.96886E-7

Date of computation: 2025-09-10 09:04 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

24.047

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.1177

Unit

Source

[2]

Diameter

Value

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]	EARN	1.) A. S. Rivkin et al 2025 Res. Notes AAS 9 70 - JWST Observations of Potentially Hazardous Asteroid 2024 YR4

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

138

Unit

Source

[1]

Unobserved

Value

171

Unit

Source

[1]

Normalized RMS of residuals

Value

0.484448

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2024-12-25.304941

Unit

Source

[2]

Last Observation

Value

2025-05-11.8922344

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

504 (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 2024YR4 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	1952-09-02 06:29	73.2	0.0416093	0.0406770	0.0003222
EARTH	1956-08-30 18:15	116.8	0.0662690	0.0635126	0.0009274
EARTH	1960-09-08 23:08	209.2	0.0586405	0.0560108	0.0008964
EARTH	1964-08-30 02:13	173.1	0.0695487	0.0656770	0.0013107
EARTH	1972-08-24 03:54	127.4	0.1637164	0.1594435	0.0014260
EARTH	2012-08-29 00:22	30.1	0.1953959	0.1943978	0.0003328
EARTH	2016-09-08 15:40	30.2	0.0759978	0.0755515	0.0001494
EARTH	2020-10-26 19:12	48.7	0.1392268	0.1391729	0.0000180
EARTH	2024-12-25 04:45	< 1 s	0.0055400	0.0055400	0.0000000
EARTH	2028-12-17 12:14	27.2	0.0535730	0.0532715	0.0001005
EARTH	2032-12-22 08:30	28.1	0.0018114	0.0013634	0.0001493
MOON	2032-12-22 15:04	24.6	0.0001008	0.0000069	0.0001595
EARTH	2051-09-18 21:14	> 1 mo	0.0647101	0.0620836	0.6438319
EARTH	2115-09-23 05:52	> 1 mo	0.0662195	0.0657681	0.8593749

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
22.93158687	352.93601033	0.00280260	MINIMUM
335.19505328	253.41150802	0.05928370	MINIMUM
358.05262593	301.15337168	0.14544195	SADDLE
358.81818249	122.84914665	1.86159201	SADDLE
179.73891306	124.16282284	3.17068885	SADDLE
179.80175402	304.19508615	5.17025763	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2024YR4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2047-12-22.047	69066.047	3.816	0.000	0.55 ± 0.000	2.18E4	3.19E-8	7.90E0	-6.62	0
2047-12-22.052	69066.052	0.227	0.000	0.19 ± 0.000	1.28E5	7.97E-6	7.89E0	-4.22	0


Based on 504 optical observations (of which 27 are rejected as outliers) from 2024/12/25.305 to 2025/05/11.892.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.32 and 1.32 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20250805 130500.123 UTC.

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