Asteroids

2025HC help

Last update: 2025-04-21 12:30 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.778

Aphelion (Q)

3.073

Eccentricity (e)

0.596

Inclination (i)

0.8

deg

Orbit period (P)

976.1

Earth MOID

0.00048

U parameter

7.4

Next Earth close approach

Date

2033-05-06

Nominal distance (from Earth center)

0.12696

18993334

Maximum Brightness

26.6

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.4

mag

Diameter

14 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-04-18

Observatory

MAP, 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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.925797

1-sigma variation

0.000985

Unit

Eccentricity (e)

Value

0.595773

1-sigma variation

0.000240

Unit

Inclination (i)

Value

0.8497

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

212.0552

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

64.8916

1-sigma variation

0.0010

Unit

Mean Anomaly (M)

Value

349.02296

1-sigma variation

0.01039

Unit

Perihelion distance

Value

0.778459

1-sigma variation

Unit

Aphelion distance

Value

3.073135

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.014561

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.670701

1-sigma variation

Unit

MOID

Value

0.000479

1-sigma variation

Unit

Orbit Period

Value

976.1447

1-sigma variation

Unit

U parameter

Value

7.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.70917E-7	2.36707E-7	2.34864E-7	1.65978E-7	9.45886E-7	1.02420E-5
e	2.36707E-7	5.77094E-8	5.72530E-8	4.05167E-8	2.30786E-7	2.49694E-6
i	2.34864E-7	5.72530E-8	5.74802E-8	3.75617E-8	2.29618E-7	2.47776E-6
Ω	1.65978E-7	4.05167E-8	3.75617E-8	3.98891E-8	1.64976E-7	1.74895E-6
ω	9.45886E-7	2.30786E-7	2.29618E-7	1.64976E-7	9.69813E-7	9.97134E-6
M	1.02420E-5	2.49694E-6	2.47776E-6	1.74895E-6	9.97134E-6	1.08042E-4

Date of computation: 2025-04-21 12:30 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

26.441

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

14 - 30*

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

0.560637

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-04-18.13812

Unit

Source

[2]

Last Observation

Value

2025-04-20.20308

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

66 (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

Close Approaches for 2025HC from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1970-09-11 19:46	> 1 w	0.0630999	0.0108157	0.2186058
EARTH	1978-04-17 03:10	> 1 w	0.0375509	0.0013996	0.1728720
EARTH	1991-05-27 09:34	> 1 mo	0.1978172	0.0237129	0.0581184
EARTH	2017-09-08 17:41	> 1 d	0.0161631	0.0105704	0.0282694
EARTH	2025-04-20 18:48	< 1 s	0.0031067	0.0031033	0.0000011
EARTH	2033-05-06 22:15	> 1 d	0.1269626	0.0327361	0.0314168
EARTH	2057-08-05 11:31	> 1 w	0.1860349	0.0115027	0.0639365
EARTH	2065-09-01 07:54	> 1 w	0.0565482	0.0108313	0.1164354
EARTH	2073-09-10 08:54	> 1 d	0.0413360	0.0108123	0.0153526
EARTH	2081-09-18 22:33	> 1 w	0.1772735	0.0104276	0.1401892
EARTH	2116-04-14 20:18	> 1 mo	0.1114330	0.0001924	0.5819970
EARTH	2124-04-28 21:06	> 1 mo	0.0616765	0.0004307	0.3397648

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
323.39220887	107.19034938	0.00047860	MINIMUM
36.84987222	242.54413834	0.01108730	MINIMUM
0.17266422	174.94557471	0.23807882	SADDLE
0.14550094	354.89399367	1.76212890	SADDLE
180.03994860	354.75765250	2.08955362	SADDLE
180.03651960	174.75683634	4.08930536	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025HC

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2047-04-22.099	68822.099	-2.689	0.49 ± 0.004	3.02E6	8.25E-9	2.76E-9	-8.30
2062-04-21.563	74300.563	-2.846	1.04 ± 0.004	2.94E5	3.13E-8	1.06E-8	-7.94
2079-04-21.811	80509.811	-2.615	1.06 ± 0.003	1.77E5	1.04E-7	3.53E-8	-7.58
2084-04-20.933	82335.933	-2.511	0.90 ± 0.004	3.13E5	1.34E-7	4.55E-8	-7.50
2084-04-21.008	82336.008	-2.472	0.40 ± 0.005	1.24E5	3.57E-7	1.21E-7	-7.08


Based on 52 optical observations (of which 0 are rejected as outliers) from 2025/04/18.138 to 2025/04/19.187.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.23 and 1.23 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20250419 130656.965 UTC.

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