Asteroids

2026HW help

Last update: 2026-06-05 00:56 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.836

Aphelion (Q)

1.939

Eccentricity (e)

0.398

Inclination (i)

9.6

deg

Orbit period (P)

596.8

Earth MOID

0.02424

U parameter

8.2

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

26 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-04-17

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

1.387235

1-sigma variation

0.001594

Unit

Eccentricity (e)

Value

0.397712

1-sigma variation

0.000877

Unit

Inclination (i)

Value

9.6359

1-sigma variation

0.0158

Unit

Long. of Ascending Node (Ω)

Value

44.6815

1-sigma variation

0.0016

Unit

Arg. of Perihelion (ω)

Value

236.7598

1-sigma variation

0.0051

Unit

Mean Anomaly (M)

Value

356.52461

1-sigma variation

0.02365

Unit

Perihelion distance

Value

0.835516

1-sigma variation

Unit

Aphelion distance

Value

1.938955

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.501565

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.049478

1-sigma variation

Unit

MOID

Value

0.024240

1-sigma variation

Unit

Orbit Period

Value

596.7930

1-sigma variation

Unit

U parameter

Value

8.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.53961E-6	1.39824E-6	2.52320E-5	2.54717E-6	-8.12669E-6	3.76819E-5
e	1.39824E-6	7.69838E-7	1.38920E-5	1.40266E-6	-4.47428E-6	2.07466E-5
i	2.52320E-5	1.38920E-5	2.50700E-4	2.52800E-5	-8.07330E-5	3.74390E-4
Ω	2.54717E-6	1.40266E-6	2.52800E-5	2.63341E-6	-8.16594E-6	3.77757E-5
ω	-8.12669E-6	-4.47428E-6	-8.07330E-5	-8.16594E-6	2.60324E-5	-1.20584E-4
M	3.76819E-5	2.07466E-5	3.74390E-4	3.77757E-5	-1.20584E-4	5.59118E-4

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

25.048

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

26 - 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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.412563

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-04-17.333832

Unit

Source

[2]

Last Observation

Value

2026-04-24.99829

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

37 (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 2026HW 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	1954-09-13 12:10	> 1 w	0.1429586	0.1390046	0.0366011
EARTH	1959-04-30 09:41	> 1 w	0.0361556	0.0268444	0.0431582
MARS	1966-05-03 07:50	1122.1	0.0111796	0.0108983	0.0077783
EARTH	1972-08-30 17:24	> 1 mo	0.1858474	0.1351240	0.1312085
EARTH	1977-04-24 06:32	> 1 w	0.0454680	0.0263550	0.2833435
EARTH	2008-05-29 02:28	> 1 mo	0.1672100	0.0805215	0.1178554
EARTH	2021-09-12 08:00	> 1 d	0.1477948	0.1371681	0.0195577
EARTH	2026-04-28 07:26	< 1 min	0.0245143	0.0243734	0.0000470
EARTH	2044-04-17 02:30	> 1 w	0.1488378	0.0290255	0.2050902
EARTH	2057-06-12 21:33	> 1 mo	0.1983217	0.1276698	0.1174065
EARTH	2070-09-16 19:06	> 1 w	0.1372740	0.1372594	0.0035548
EARTH	2075-05-03 22:26	> 1 mo	0.0552069	0.0245497	0.2708827
EARTH	2088-09-07 07:22	> 1 w	0.1688740	0.1320363	0.0376565
EARTH	2093-04-26 23:27	1073.9	0.0262938	0.0222765	0.0048650
EARTH	2119-09-21 13:29	> 1 w	0.1449534	0.1360078	0.1458133
EARTH	2124-05-09 01:18	> 1 mo	0.0858513	0.0277170	0.4220416

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
315.29813189	112.12399438	0.02424013	MINIMUM
50.65588789	249.89181120	0.13802654	MINIMUM
7.56423170	188.42689342	0.22778943	SADDLE
181.75681598	357.84140586	0.97515626	SADDLE
0.99398849	358.14936912	1.81450345	SADDLE
179.47893049	176.35135348	2.94921636	MAXIMUM

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MOID Plots

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