Asteroids

2026JA4 help

Last update: 2026-05-18 13:46 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

1.000

Aphelion (Q)

2.789

Eccentricity (e)

0.472

Inclination (i)

1.2

deg

Orbit period (P)

952.7

Earth MOID

0.00594

U parameter

7.9

Next Earth close approach

Date

2026-05-21

Nominal distance (from Earth center)

0.01939

2900522

Maximum Brightness

20.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.2

mag

Diameter

10 - 22*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-05-14

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.894866

1-sigma variation

0.002118

Unit

Eccentricity (e)

Value

0.472102

1-sigma variation

0.000595

Unit

Inclination (i)

Value

1.1955

1-sigma variation

0.0010

Unit

Long. of Ascending Node (Ω)

Value

85.2917

1-sigma variation

0.0087

Unit

Arg. of Perihelion (ω)

Value

178.1659

1-sigma variation

0.0074

Unit

Mean Anomaly (M)

Value

359.66692

1-sigma variation

0.00156

Unit

Perihelion distance

Value

1.000297

1-sigma variation

Unit

Aphelion distance

Value

2.789436

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.803955

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.015448

1-sigma variation

Unit

MOID

Value

0.005943

1-sigma variation

Unit

Orbit Period

Value

952.7222

1-sigma variation

Unit

U parameter

Value

7.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.48436E-6	1.26084E-6	2.00824E-6	1.65745E-5	-1.20089E-5	3.24404E-6
e	1.26084E-6	3.54507E-7	5.64841E-7	4.65405E-6	-3.36877E-6	9.11641E-7
i	2.00824E-6	5.64841E-7	9.14595E-7	6.94835E-6	-4.78859E-6	1.41908E-6
Ω	1.65745E-5	4.65405E-6	6.94835E-6	7.60393E-5	-6.27599E-5	1.30424E-5
ω	-1.20089E-5	-3.36877E-6	-4.78859E-6	-6.27599E-5	5.50744E-5	-1.00166E-5
M	3.24404E-6	9.11641E-7	1.41908E-6	1.30424E-5	-1.00166E-5	2.42793E-6

Date of computation: 2026-05-18 13:46 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

27.203

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

10 - 22*

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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.39902

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-05-14.302788

Unit

Source

[2]

Last Observation

Value

2026-05-17.96147

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

33 (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 2026JA4 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	1958-04-29 05:43	> 1 mo	0.1757566	0.0143660	15.5431307
EARTH	1971-07-03 11:52	> 1 mo	0.0055115	0.0054767	0.0085191
EARTH	2005-07-23 06:25	> 1 w	0.0873885	0.0081963	0.1908859
EARTH	2026-05-21 23:17	< 1 min	0.0193888	0.0193249	0.0000213
EARTH	2039-07-11 06:25	> 1 w	0.0203063	0.0063328	0.0861016
EARTH	2060-05-03 22:11	> 1 mo	0.1276039	0.0096279	1.4953509
MARS	2083-08-14 08:42	> 1 mo	0.0214165	0.0174606	0.6052721
EARTH	2094-05-22 13:52	> 1 mo	0.0211970	0.0063331	0.9522451
EARTH	2107-06-25 11:38	> 1 mo	0.0156473	0.0095922	2.0118001
EARTH	2120-07-06 00:57	> 1 mo	0.0070360	0.0069487	2.9632358

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
10.61568665	176.63138755	0.00594287	MINIMUM
350.65032421	142.93209476	0.00638388	MINIMUM
0.59094782	159.70603398	0.01547007	SADDLE
180.22169176	339.30769369	1.80485751	SADDLE
0.60728452	339.74424868	1.98485298	SADDLE
180.22966527	159.31619178	3.80517688	MAXIMUM

Download:

MOID Plots

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