Asteroids

2026HJ1 help

Last update: 2026-06-05 09:04 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.886

Aphelion (Q)

2.269

Eccentricity (e)

0.439

Inclination (i)

2.2

deg

Orbit period (P)

723.6

Earth MOID

0.00133

U parameter

7.0

Next Earth close approach

Date

2028-04-10

Nominal distance (from Earth center)

0.122

18250887

Maximum Brightness

26.6

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.5

mag

Diameter

5 - 12*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-04-18

Observatory

University of Arizona 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

1.577434

1-sigma variation

0.000431

Unit

Eccentricity (e)

Value

0.438585

1-sigma variation

0.000173

Unit

Inclination (i)

Value

2.2465

1-sigma variation

0.0006

Unit

Long. of Ascending Node (Ω)

Value

33.0866

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

230.2891

1-sigma variation

0.0006

Unit

Mean Anomaly (M)

Value

4.22057

1-sigma variation

0.00017

Unit

Perihelion distance

Value

0.885595

1-sigma variation

Unit

Aphelion distance

Value

2.269273

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.774100

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.009690

1-sigma variation

Unit

MOID

Value

0.001328

1-sigma variation

Unit

Orbit Period

Value

723.6446

1-sigma variation

Unit

U parameter

Value

7.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.85563E-7	7.45844E-8	2.43170E-7	1.18454E-7	-2.18697E-7	7.05584E-8
e	7.45844E-8	2.99785E-8	9.77528E-8	4.75863E-8	-8.77597E-8	2.83279E-8
i	2.43170E-7	9.77528E-8	3.19301E-7	1.54146E-7	-2.81096E-7	9.12627E-8
Ω	1.18454E-7	4.75863E-8	1.54146E-7	7.74817E-8	-1.49208E-7	4.71443E-8
ω	-2.18697E-7	-8.77597E-8	-2.81096E-7	-1.49208E-7	3.12451E-7	-9.54275E-8
M	7.05584E-8	2.83279E-8	9.12627E-8	4.71443E-8	-9.54275E-8	2.95955E-8

Date of computation: 2026-06-05 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

28.495

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

5 - 12*

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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.454331

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-04-18.332022

Unit

Source

[2]

Last Observation

Value

2026-04-20.633757

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

[-]

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 2026HJ1 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
MARS	2013-11-29 20:06	1315.8	0.0207251	0.0061488	0.0181282
EARTH	2024-04-11 03:02	503.3	0.1050392	0.0898824	0.0050526
EARTH	2026-04-21 00:27	< 1 s	0.0043002	0.0042958	0.0000015
EARTH	2028-04-10 05:05	470.8	0.1219996	0.1068401	0.0050534
EARTH	2113-08-21 18:45	> 1 w	0.1092873	0.0380927	0.1114187
EARTH	2115-08-12 03:49	> 1 w	0.0383125	0.0380733	0.0109181
EARTH	2117-07-21 23:05	> 1 mo	0.0981728	0.0411085	0.0833426
EARTH	2119-06-22 11:38	> 1 mo	0.1326821	0.1191656	0.0102086
EARTH	2121-05-24 11:54	> 1 mo	0.1124807	0.0180351	0.0940403
EARTH	2123-04-29 05:14	> 1 mo	0.0356039	0.0002498	0.2156652
EARTH	2125-04-18 05:13	> 1 w	0.0485283	0.0000239	0.1115055

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
325.90334835	105.76452853	0.00132773	MINIMUM
35.56384657	213.86138701	0.03848847	MINIMUM
1.42395865	160.87231685	0.13344061	SADDLE
180.36733970	339.32781817	1.28548685	SADDLE
0.79553144	339.85979305	1.86993387	SADDLE
180.28250691	159.27979049	3.28468614	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2026HJ1

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2109-04-23.030	91468.030	-4.501	0.91 ± 0.001	2.18E5	1.67E-10	1.35E-2	-11.67
2113-04-23.175	92929.175	-3.378	0.28 ± 0.001	4.12E4	9.30E-8	1.35E-2	-8.95
2119-04-23.584	95120.584	-0.825	0.94 ± 0.000	6.34E4	1.03E-5	1.36E-2	-6.93


Based on 47 optical observations (of which 0 are rejected as outliers) from 2026/04/18.332 to 2026/04/20.634.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.47 and 1.47 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20260421 133621.510 UTC.

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