Asteroids

2026HK4 help

Last update: 2026-04-28 13:01 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.549

Aphelion (Q)

2.760

Eccentricity (e)

0.668

Inclination (i)

0.9

deg

Orbit period (P)

777.5

Earth MOID

0.00536

U parameter

9.0

Next Earth close approach

Date

2030-11-15

Nominal distance (from Earth center)

0.0892

13344209

Maximum Brightness

23.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.7

mag

Diameter

19 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-04-24

Observatory

Kitt Peak-Bok

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

1.654789

1-sigma variation

0.009353

Unit

Eccentricity (e)

Value

0.668065

1-sigma variation

0.002558

Unit

Inclination (i)

Value

0.9141

1-sigma variation

0.0049

Unit

Long. of Ascending Node (Ω)

Value

24.2886

1-sigma variation

0.0186

Unit

Arg. of Perihelion (ω)

Value

297.0835

1-sigma variation

0.0137

Unit

Mean Anomaly (M)

Value

352.59546

1-sigma variation

0.11067

Unit

Perihelion distance

Value

0.549282

1-sigma variation

Unit

Aphelion distance

Value

2.760295

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.295675

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.318001

1-sigma variation

Unit

MOID

Value

0.005364

1-sigma variation

Unit

Orbit Period

Value

777.5213

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.74769E-5	2.39276E-5	4.54677E-5	1.70001E-4	-1.26441E-4	1.03510E-3
e	2.39276E-5	6.54517E-6	1.24433E-5	4.65523E-5	-3.45820E-5	2.83124E-4
i	4.54677E-5	1.24433E-5	2.38488E-5	9.02094E-5	-6.60424E-5	5.37786E-4
Ω	1.70001E-4	4.65523E-5	9.02094E-5	3.46633E-4	-2.49839E-4	2.00979E-3
ω	-1.26441E-4	-3.45820E-5	-6.60424E-5	-2.49839E-4	1.87605E-4	-1.49622E-3
M	1.03510E-3	2.83124E-4	5.37786E-4	2.00979E-3	-1.49622E-3	1.22485E-2

Date of computation: 2026-04-28 13:01 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

25.718

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

19 - 40*

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

0.401059

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-04-24.297872

Unit

Source

[2]

Last Observation

Value

2026-04-28.239226

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

22 (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 2026HK4 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	1964-11-23 07:38	> 1 mo	0.0835453	0.0085573	16.7497229
VENUS	1985-12-22 10:30	> 1 mo	0.0107258	0.0106417	0.0570800
VENUS	2005-04-11 15:27	> 1 w	0.0336694	0.0329503	0.0766090
EARTH	2009-04-30 18:28	> 1 w	0.0634810	0.0052538	0.5786959
EARTH	2013-11-07 07:29	> 1 mo	0.1981753	0.0095550	0.6725288
EARTH	2026-05-05 19:36	1.9	0.0282757	0.0279320	0.0001146
EARTH	2030-11-15 08:58	> 1 w	0.0892005	0.0087763	0.2227103
EARTH	2047-11-25 07:32	> 1 mo	0.0936133	0.0087660	0.7944334
MARS	2068-10-07 01:57	> 1 w	0.0387147	0.0269460	0.2225529
EARTH	2075-04-30 00:34	> 1 w	0.1004406	0.0054453	0.1618746
EARTH	2092-05-10 15:45	> 1 mo	0.1090469	0.0053804	0.5566538
EARTH	2096-11-20 09:26	> 1 mo	0.0088313	0.0087251	0.0940628
VENUS	2116-01-06 21:26	> 1 mo	0.0334571	0.0330718	6.8951769
EARTH	2124-05-04 04:24	> 1 mo	0.0338274	0.0057295	131.7210525

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
305.79638964	118.28233491	0.00536394	MINIMUM
52.93093944	313.93103517	0.00873709	MINIMUM
358.84872163	215.40679794	0.46442513	SADDLE
358.88743461	35.46770399	1.53592508	SADDLE
179.76928972	36.65966307	1.77366828	SADDLE
179.76859572	216.65385648	3.77369345	MAXIMUM

Download:

MOID Plots

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