Asteroids

2026JD4 help

Last update: 2026-05-17 13:15 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.534

Aphelion (Q)

4.121

Eccentricity (e)

0.771

Inclination (i)

6.7

deg

Orbit period (P)

1296.9

Earth MOID

0.00524

U parameter

8.8

Next Earth close approach

Date

2026-05-21

Nominal distance (from Earth center)

0.0109

1630776

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

25.1

mag

Diameter

25 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-05-14

Observatory

Pan-STARRS 1, Haleakala

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

2.327453

1-sigma variation

0.012150

Unit

Eccentricity (e)

Value

0.770538

1-sigma variation

0.001398

Unit

Inclination (i)

Value

6.6948

1-sigma variation

0.0115

Unit

Long. of Ascending Node (Ω)

Value

65.0895

1-sigma variation

0.0020

Unit

Arg. of Perihelion (ω)

Value

269.5039

1-sigma variation

0.0043

Unit

Mean Anomaly (M)

Value

352.42917

1-sigma variation

0.07261

Unit

Perihelion distance

Value

0.534062

1-sigma variation

Unit

Aphelion distance

Value

4.120845

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.035642

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.073255

1-sigma variation

Unit

MOID

Value

0.005236

1-sigma variation

Unit

Orbit Period

Value

1296.9401

1-sigma variation

Unit

U parameter

Value

8.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.47613E-4	1.69837E-5	1.39613E-4	3.72368E-6	-4.36161E-5	8.82156E-4
e	1.69837E-5	1.95409E-6	1.60656E-5	4.22881E-7	-5.01185E-6	1.01498E-4
i	1.39613E-4	1.60656E-5	1.32733E-4	1.84940E-6	-3.93519E-5	8.34464E-4
Ω	3.72368E-6	4.22881E-7	1.84940E-6	4.18020E-6	-5.73972E-6	2.19780E-5
ω	-4.36161E-5	-5.01185E-6	-3.93519E-5	-5.73972E-6	1.81910E-5	-2.60343E-4
M	8.82156E-4	1.01498E-4	8.34464E-4	2.19780E-5	-2.60343E-4	5.27192E-3

Date of computation: 2026-05-17 13:15 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

25.101

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

25 - 60*

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

1.0

Unit

Source

[1]

Normalized RMS of residuals

Value

0.548846

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-05-14.352456

Unit

Source

[2]

Last Observation

Value

2026-05-17.396633

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

32 (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

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 2026JD4 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
VENUS	1973-01-26 10:38	> 1 mo	0.0413600	0.0190337	3.4161435
EARTH	1983-12-01 10:49	> 1 mo	0.0320568	0.0028003	1.2938490
EARTH	2026-05-21 05:33	< 1 min	0.0109011	0.0108418	0.0000198
52 Europa	2032-12-13 08:24	> 1 d	0.0145475	0.0125075	0.0829825
EARTH	2040-11-21 05:09	> 1 mo	0.1472326	0.0143234	0.6719611
EARTH	2058-05-15 04:41	> 1 mo	0.1137326	0.0050177	0.9316479
EARTH	2079-12-04 23:16	> 1 d	0.0696284	0.0181190	0.0798171
EARTH	2097-05-22 11:19	> 1 mo	0.0204605	0.0024642	0.6385640
VENUS	2097-08-01 16:32	> 1 mo	0.0262446	0.0001118	0.7428586
EARTH	2111-12-07 20:58	> 1 mo	0.1042555	0.0262240	10.3369429
EARTH	2122-05-14 06:57	> 1 mo	0.1625923	0.0079789	10.5969171

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
41.58132953	323.78745850	0.00523600	MINIMUM
317.25777807	134.77599278	0.01087330	MINIMUM
358.92974049	228.55296434	0.48454375	SADDLE
358.92033622	48.49569538	1.52093215	SADDLE
179.85726261	49.95322285	3.14031115	SADDLE
179.85010079	229.94681167	5.12610406	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2026JD4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2069-05-21.614	76887.614	1.216	0.000	0.16 ± 0.078	1.48E7	2.81E-8	4.49E0	-7.15	0
2085-05-21.360	82731.360	-3.169	1.396	1.10 ± 0.078	1.06E5	9.82E-10	4.25E0	-8.76	0


Based on 32 optical observations (of which 0 are rejected as outliers) from 2026/05/14.352 to 2026/05/17.397.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.10 and 1.10 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20260517 140103.085 UTC.

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Download Impactor Table as: