Asteroids

2025HD1 help

Last update: 2025-04-29 13:12 UTC

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Orbital Properties

Epoch

60800.0

MJD

Orbit type

Amor

Perihelion (q)

1.035

Aphelion (Q)

1.740

Eccentricity (e)

0.254

Inclination (i)

30.1

deg

Orbit period (P)

596.8

Earth MOID

0.03352

U parameter

8.0

Next Earth close approach

Date

2043-04-13

Nominal distance (from Earth center)

0.18407

27536638

Maximum Brightness

24.6

mag

Risk

Object is not in risk list

Object is in priority list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

20 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-04-21

Observatory

Mt. Lemmon Survey

ORBIT VISUALISATION TOOLS

External links

Proper elements

A connection to orbit determination server is not possible. The displayed data is archived data.

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

1.387197

1-sigma variation

0.001273

Unit

Eccentricity (e)

Value

0.254179

1-sigma variation

0.000659

Unit

Inclination (i)

Value

30.1421

1-sigma variation

0.0296

Unit

Long. of Ascending Node (Ω)

Value

210.4983

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

11.1304

1-sigma variation

0.0087

Unit

Mean Anomaly (M)

Value

2.15803

1-sigma variation

0.00340

Unit

Perihelion distance

Value

1.034601

1-sigma variation

Unit

Aphelion distance

Value

1.739793

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.033705

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.734106

1-sigma variation

Unit

MOID

Value

0.033519

1-sigma variation

Unit

Orbit Period

Value

596.7680

1-sigma variation

Unit

U parameter

Value

8.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.62141E-6	8.38705E-7	3.76445E-5	-1.00622E-7	-1.11068E-5	4.31987E-6
e	8.38705E-7	4.33835E-7	1.94723E-5	-5.20491E-8	-5.74513E-6	2.23450E-6
i	3.76445E-5	1.94723E-5	8.74004E-4	-2.33598E-6	-2.57877E-4	1.00300E-4
Ω	-1.00622E-7	-5.20491E-8	-2.33598E-6	6.26883E-9	6.87542E-7	-2.67104E-7
ω	-1.11068E-5	-5.74513E-6	-2.57877E-4	6.87542E-7	7.62858E-5	-2.97074E-5
M	4.31987E-6	2.23450E-6	1.00300E-4	-2.67104E-7	-2.97074E-5	1.15754E-5

Date of computation: 2025-04-29 13:12 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

A connection to orbit determination server is not possible. The displayed data is archived data.

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

25.641

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

20 - 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

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

A connection to orbit determination server is not possible. The displayed data is archived data.

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

0.588473

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-04-21.25988

Unit

Source

[2]

Last Observation

Value

2025-04-28.47567

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

47 (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

A connection to orbit determination server is not possible. The displayed data is archived data.

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

A connection to orbit determination server is not possible. The displayed data is archived data.

Close Approaches for 2025HD1 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	1958-04-25 02:50	> 1 w	0.0980184	0.0307349	0.4479265
EARTH	1976-04-19 08:23	> 1 w	0.0451848	0.0329820	0.2280520
EARTH	2007-04-30 00:15	> 1 d	0.1964022	0.0221969	0.1501163
EARTH	2025-04-21 03:21	< 1 s	0.0336257	0.0335117	0.0000380
EARTH	2043-04-13 21:32	> 1 d	0.1840711	0.0249310	0.1519189
EARTH	2074-04-23 07:31	> 1 w	0.0544247	0.0331775	0.2622889
EARTH	2092-04-17 17:15	> 1 w	0.0840509	0.0321800	0.2594520
EARTH	2123-04-30 18:19	> 1 d	0.1841255	0.0238594	0.0725593

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A connection to orbit determination server is not possible. The displayed data is archived data.

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
351.70549630	107.73761888	0.03351862	MINIMUM
226.14849944	331.89876049	0.80351960	SADDLE
14.47031554	313.98378033	2.01812197	SADDLE
178.21544660	117.20639127	2.74458468	MAXIMUM

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MOID Plots

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