Asteroids

2025HT6 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.899

Aphelion (Q)

1.898

Eccentricity (e)

0.357

Inclination (i)

1.0

deg

Orbit period (P)

604.0

Earth MOID

0.00253

U parameter

6.2

Next Earth close approach

Date

2030-01-04

Nominal distance (from Earth center)

0.02687

4019539

Maximum Brightness

20.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

23.4

mag

Diameter

60 - 130*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-04-27

Observatory

MAPS, San Pedro de Atacama

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

1.398380

1-sigma variation

0.000095

Unit

Eccentricity (e)

Value

0.357470

1-sigma variation

0.000054

Unit

Inclination (i)

Value

0.9873

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

107.0653

1-sigma variation

0.0027

Unit

Arg. of Perihelion (ω)

Value

39.0646

1-sigma variation

0.0023

Unit

Mean Anomaly (M)

Value

281.55974

1-sigma variation

0.02919

Unit

Perihelion distance

Value

0.898501

1-sigma variation

Unit

Aphelion distance

Value

1.898258

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.028433

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.670265

1-sigma variation

Unit

MOID

Value

0.002526

1-sigma variation

Unit

Orbit Period

Value

603.9988

1-sigma variation

Unit

U parameter

Value

6.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.08162E-9	5.19114E-9	1.51652E-8	-2.43563E-7	2.15096E-7	-2.78140E-6
e	5.19114E-9	2.96741E-9	8.66624E-9	-1.39114E-7	1.22852E-7	-1.58989E-6
i	1.51652E-8	8.66624E-9	2.55431E-8	-4.17235E-7	3.67976E-7	-4.64290E-6
Ω	-2.43563E-7	-1.39114E-7	-4.17235E-7	7.08130E-6	-6.24446E-6	7.45213E-5
ω	2.15096E-7	1.22852E-7	3.67976E-7	-6.24446E-6	5.51559E-6	-6.58197E-5
M	-2.78140E-6	-1.58989E-6	-4.64290E-6	7.45213E-5	-6.58197E-5	8.51866E-4

Date of computation: 2026-03-17 23:26 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

23.362

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

60 - 130*

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

314

Unit

Source

[1]

Normalized RMS of residuals

Value

0.544137

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-04-27.28332

Unit

Source

[2]

Last Observation

Value

2025-06-04.402446

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

85 (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 2025HT6 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	1962-04-25 13:48	> 1 d	0.1956627	0.0179766	0.0939832
EARTH	1967-04-12 03:45	> 1 d	0.0328632	0.0169865	0.0426308
EARTH	1972-03-27 11:07	> 1 mo	0.0472659	0.0176489	0.0830999
EARTH	1977-02-18 07:38	> 1 mo	0.0888905	0.0875784	0.0014747
EARTH	1982-01-11 00:42	> 1 w	0.0476338	0.0038821	0.0595710
MARS	1985-02-04 17:10	276.7	0.0200780	0.0096101	0.0109282
EARTH	1986-12-27 02:43	> 1 d	0.0226253	0.0027190	0.0171975
EARTH	2020-04-22 02:56	284.6	0.1413508	0.1319434	0.0031376
EARTH	2025-03-23 21:02	< 1 min	0.0584654	0.0584365	0.0000096
EARTH	2030-01-04 16:18	971.2	0.0268690	0.0186771	0.0027367
EARTH	2034-12-17 20:11	320.4	0.1282831	0.1175078	0.0035919
EARTH	2073-04-22 21:42	> 1 d	0.1466486	0.0336717	0.0386570
EARTH	2078-04-06 04:01	> 1 d	0.0220166	0.0172420	0.0191992
EARTH	2083-01-28 20:50	> 1 mo	0.0779673	0.0136658	0.0298854
EARTH	2087-12-20 17:16	> 1 w	0.0949488	0.0011905	0.1019195
EARTH	2121-04-15 16:42	> 1 d	0.0473601	0.0171370	0.0264998
EARTH	2126-03-08 04:29	> 1 w	0.0822236	0.0660533	0.0054181

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
326.15885420	357.16127507	0.00250424	MINIMUM
37.63683671	96.52847955	0.01724599	MINIMUM
2.34450023	47.41024491	0.09071022	SADDLE
181.01708180	225.88574011	0.88547637	SADDLE
2.14987434	227.11230897	1.91147291	SADDLE
180.96040181	45.83739618	2.88686250	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025HT6

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2126-01-01.122	97565.122	-0.568	0.000	1.24 ± 0.003	2.13E6	4.53E-7	1.29E1	-5.93	0
2126-01-01.123	97565.123	-0.587	0.000	0.51 ± 0.004	1.47E6	7.67E-7	1.29E1	-5.70	0


Based on 85 optical observations (of which 0 are rejected as outliers) from 2025/04/27.283 to 2025/06/04.402.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.75 and 1.75 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20260112 105640.596 UTC.

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