Asteroids

2026HH1 help

Last update: 2026-06-05 00:36 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.699

Aphelion (Q)

3.850

Eccentricity (e)

0.693

Inclination (i)

2.8

deg

Orbit period (P)

1252.8

Earth MOID

0.00374

U parameter

7.5

Next Earth close approach

Date

2043-09-14

Nominal distance (from Earth center)

0.10017

14985147

Maximum Brightness

26.7

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.1

mag

Diameter

6 - 15*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-04-18

Observatory

JPL SynTrack Robotic Telescope, Auberry

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

2.274298

1-sigma variation

0.002004

Unit

Eccentricity (e)

Value

0.692861

1-sigma variation

0.000305

Unit

Inclination (i)

Value

2.8009

1-sigma variation

0.0009

Unit

Long. of Ascending Node (Ω)

Value

33.9376

1-sigma variation

0.0006

Unit

Arg. of Perihelion (ω)

Value

250.7017

1-sigma variation

0.0010

Unit

Mean Anomaly (M)

Value

1.64023

1-sigma variation

0.00011

Unit

Perihelion distance

Value

0.698525

1-sigma variation

Unit

Aphelion distance

Value

3.850072

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.537706

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.042662

1-sigma variation

Unit

MOID

Value

0.003739

1-sigma variation

Unit

Orbit Period

Value

1252.7649

1-sigma variation

Unit

U parameter

Value

7.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.01496E-6	6.10855E-7	1.66878E-6	9.58224E-7	-1.29953E-6	2.07179E-7
e	6.10855E-7	9.29399E-8	2.54091E-7	1.45383E-7	-1.96828E-7	3.14971E-8
i	1.66878E-6	2.54091E-7	7.27242E-7	3.27910E-7	-4.15071E-7	8.34655E-8
Ω	9.58224E-7	1.45383E-7	3.27910E-7	3.76455E-7	-5.71364E-7	5.49144E-8
ω	-1.29953E-6	-1.96828E-7	-4.15071E-7	-5.71364E-7	9.31467E-7	-7.93273E-8
M	2.07179E-7	3.14971E-8	8.34655E-8	5.49144E-8	-7.93273E-8	1.10316E-8

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

28.062

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

6 - 15*

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

0.9

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.776469

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-04-18.362803

Unit

Source

[2]

Last Observation

Value

2026-04-19.255012

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

54 (3)

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 2026HH1 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	1970-10-27 23:22	> 1 d	0.0436871	0.0159681	0.0686370
EARTH	1974-09-05 03:43	> 1 mo	0.1725470	0.0306702	0.1904216
VENUS	1978-01-17 08:14	> 1 mo	0.0281433	0.0046635	0.1123856
EARTH	1988-04-16 23:27	> 1 d	0.0278888	0.0083883	0.0888133
EARTH	2026-04-19 17:51	< 1 s	0.0046025	0.0045970	0.0000018
VENUS	2040-02-13 11:46	> 1 w	0.0297102	0.0216731	0.0628392
EARTH	2043-09-14 12:11	> 1 w	0.1001695	0.0264074	0.1311478
EARTH	2050-05-11 05:44	> 1 w	0.1885151	0.0094482	0.1456139
MARS	2053-08-02 15:36	> 1 w	0.0326273	0.0076488	0.1358676
88 Thisbe	2061-06-25 23:03	864.7	0.0131954	0.0011023	0.0818332
VENUS	2064-02-19 08:52	> 1 mo	0.0227265	0.0218936	0.0197609
EARTH	2067-09-11 11:17	> 1 w	0.1302888	0.0250989	0.1785787
EARTH	2074-05-02 21:10	> 1 w	0.1406743	0.0032418	0.2315697
EARTH	2108-09-23 02:31	> 1 d	0.0474248	0.0208496	0.0421588
EARTH	2115-04-19 01:25	> 1 d	0.0287342	0.0005849	0.0623719
EARTH	2125-09-26 23:13	> 1 d	0.0209397	0.0183334	0.0378246

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
323.72404361	104.18980762	0.00373921	MINIMUM
36.37848095	256.48500648	0.02746912	MINIMUM
0.12699215	180.52433739	0.32069623	SADDLE
0.01942042	0.26508078	1.68159651	SADDLE
180.01424345	0.21836488	2.86797242	SADDLE
179.98977483	180.20794856	4.86606153	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2026HH1

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2064-04-20.393	75030.393	1.243	0.000	0.27 ± 0.076	8.58E6	4.94E-8	5.13E-2	-8.41	0


Based on 54 optical observations (of which 3 are rejected as outliers) from 2026/04/18.363 to 2026/04/19.255.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.16 and 1.16 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20260420 132120.907 UTC.

Download this part as:

Download Impactor Table as: