Asteroids

2024YR4 help

Last update: 2026-07-31 12:39 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.852

Aphelion (Q)

4.180

Eccentricity (e)

0.661

Inclination (i)

3.4

deg

Orbit period (P)

1457.7

Earth MOID

0.00275

U parameter

2.7

Next Earth close approach

Date

2028-12-17

Nominal distance (from Earth center)

0.05361

8019310

Maximum Brightness

22.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.1

mag

Diameter

Taxonomic type

Rotation period (T)

0.3244

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.515989

1-sigma variation

0.000002

Unit

Eccentricity (e)

Value

0.661333

1-sigma variation

3.100E-7

Unit

Inclination (i)

Value

3.4081

1-sigma variation

2.714E-6

Unit

Long. of Ascending Node (Ω)

Value

271.3670

1-sigma variation

1.352E-5

Unit

Arg. of Perihelion (ω)

Value

134.3664

1-sigma variation

1.394E-5

Unit

Mean Anomaly (M)

Value

139.21185

1-sigma variation

0.00018

Unit

Perihelion distance

Value

0.852082

1-sigma variation

Unit

Aphelion distance

Value

4.179896

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.614945

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.015675

1-sigma variation

Unit

MOID

Value

0.002748

1-sigma variation

Unit

Orbit Period

Value

1457.6778

1-sigma variation

Unit

U parameter

Value

2.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.78819E-12	6.76952E-13	2.38728E-12	1.02016E-12	-4.30489E-13	-3.99821E-10
e	6.76952E-13	9.60914E-14	3.45509E-13	2.02190E-13	-2.55327E-13	-5.65144E-11
i	2.38728E-12	3.45509E-13	7.36503E-12	2.14675E-11	-2.13823E-11	-1.99849E-10
Ω	1.02016E-12	2.02190E-13	2.14675E-11	1.82909E-10	-1.54071E-10	-9.74733E-11
ω	-4.30489E-13	-2.55327E-13	-2.13823E-11	-1.54071E-10	1.94263E-10	3.81532E-11
M	-3.99821E-10	-5.65144E-11	-1.99849E-10	-9.74733E-11	3.81532E-11	3.33877E-8

Date of computation: 2026-07-31 12:39 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

0.3244

Unit

Source

[1]

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

24.057

24.14

Unit

mag

Source

[2]

[1]

Slope Parameter (G)

Value

0.15**

0.51

Unit

Source

[2]

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.1177

0.11

Unit

Source

[3]

[1]

Diameter

Value

Unit

Source

[3]

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]	EARN	1.) Rivkin, A., et al.: JWST observations of potentially hazardous asteroid 2024 YR 4. Res. Notes AAS 9(4), 70 (2025)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	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

429

Unit

Source

[1]

Unobserved

Value

168

Unit

Source

[1]

Normalized RMS of residuals

Value

0.33741

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

2026-02-26.8833171

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

512 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

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Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

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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 2024YR4 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	1952-09-02 06:53	19.0	0.0415074	0.0412606	0.0000830
EARTH	1956-08-30 18:53	30.7	0.0659730	0.0652450	0.0002433
EARTH	1960-09-09 00:16	55.5	0.0589285	0.0582180	0.0002382
EARTH	1964-08-30 03:10	45.9	0.0691290	0.0680958	0.0003458
EARTH	1972-08-24 04:38	33.8	0.1632583	0.1621235	0.0003784
EARTH	2012-08-29 00:32	8.0	0.1952886	0.1950220	0.0000889
EARTH	2016-09-08 15:50	8.1	0.0759497	0.0758303	0.0000398
EARTH	2020-10-26 19:24	13.0	0.1392326	0.1392182	0.0000048
EARTH	2024-12-25 04:45	< 1 s	0.0055400	0.0055400	0.0000000
EARTH	2028-12-17 12:05	7.2	0.0536058	0.0535255	0.0000267
EARTH	2032-12-22 08:21	7.5	0.0018602	0.0017409	0.0000398
MOON	2032-12-22 14:56	6.6	0.0001530	0.0000261	0.0000425
EARTH	2052-01-05 01:53	> 1 w	0.1663492	0.0025025	0.4029726
EARTH	2089-12-27 01:56	> 1 mo	0.0104745	0.0102055	0.2249941
EARTH	2108-09-26 01:58	> 1 mo	0.0832230	0.0662323	38.6006937

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
22.90690245	349.82933195	0.00274808	MINIMUM
335.22769391	250.33734613	0.05932172	MINIMUM
358.05822819	298.06410754	0.14548646	SADDLE
358.82508712	119.76227470	1.86019823	SADDLE
179.73982510	121.06773296	3.17238613	SADDLE
179.80215197	301.09931367	5.17059919	MAXIMUM

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MOID Plots

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