Asteroids

2025HN4 help

Last update: 2025-05-03 00:31 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.915

Aphelion (Q)

1.673

Eccentricity (e)

0.293

Inclination (i)

5.0

deg

Orbit period (P)

537.8

Earth MOID

0.00255

U parameter

6.2

Next Earth close approach

Date

2047-08-16

Nominal distance (from Earth center)

0.08971

13419685

Maximum Brightness

25.3

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

27.2

mag

Diameter

10 - 22*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-04-26

Observatory

ATLAS Chile, Rio Hurtado

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

1.294254

1-sigma variation

0.000073

Unit

Eccentricity (e)

Value

0.292931

1-sigma variation

0.000047

Unit

Inclination (i)

Value

4.9855

1-sigma variation

0.0007

Unit

Long. of Ascending Node (Ω)

Value

37.0186

1-sigma variation

2.959E-5

Unit

Arg. of Perihelion (ω)

Value

235.1161

1-sigma variation

0.0008

Unit

Mean Anomaly (M)

Value

334.23760

1-sigma variation

0.00333

Unit

Perihelion distance

Value

0.915126

1-sigma variation

Unit

Aphelion distance

Value

1.673381

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.428235

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.006905

1-sigma variation

Unit

MOID

Value

0.002550

1-sigma variation

Unit

Orbit Period

Value

537.8083

1-sigma variation

Unit

U parameter

Value

6.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.33735E-9	3.44771E-9	4.90259E-8	2.15396E-9	-4.51659E-8	2.42508E-7
e	3.44771E-9	2.22986E-9	3.16856E-8	1.39294E-9	-2.82994E-8	1.56286E-7
i	4.90259E-8	3.16856E-8	4.51112E-7	1.97636E-8	-4.09442E-7	2.22528E-6
Ω	2.15396E-9	1.39294E-9	1.97636E-8	8.75841E-10	-1.77370E-8	9.76611E-8
ω	-4.51659E-8	-2.82994E-8	-4.09442E-7	-1.77370E-8	6.57157E-7	-2.16626E-6
M	2.42508E-7	1.56286E-7	2.22528E-6	9.76611E-8	-2.16626E-6	1.10659E-5

Date of computation: 2025-04-28 13:01 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

27.196

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

10 - 22*

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

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.640687

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-04-26.183

Unit

Source

[2]

Last Observation

Value

2025-04-27.73124

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

95 (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 2025HN4 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
MARS	1951-04-07 04:39	505.7	0.0277097	0.0082464	0.0078381
EARTH	2007-08-29 05:58	362.1	0.1329151	0.1232952	0.0033014
EARTH	2010-08-20 18:21	526.0	0.0864800	0.0859417	0.0003652
EARTH	2013-07-31 20:44	1406.5	0.1062853	0.1030082	0.0011355
EARTH	2016-06-29 10:27	> 1 d	0.1213879	0.1212404	0.0000566
EARTH	2019-06-01 02:54	1286.0	0.1010528	0.0980578	0.0010009
EARTH	2022-05-07 21:15	472.0	0.0466960	0.0427987	0.0012991
EARTH	2025-04-28 12:08	< 1 s	0.0043454	0.0043436	0.0000006
EARTH	2047-08-16 14:17	> 1 d	0.0897051	0.0824297	0.0039284
EARTH	2050-04-27 12:52	> 1 d	0.0154358	0.0030138	0.0131201
EARTH	2066-09-01 21:18	> 1 w	0.1283126	0.0805993	0.3424376
EARTH	2069-05-03 06:26	> 1 mo	0.0270044	0.0028724	0.4513596
EARTH	2088-08-26 13:03	> 1 mo	0.0861846	0.0811573	1.5553966
EARTH	2091-05-01 14:05	> 1 mo	0.0131642	0.0038605	5.2857476
EARTH	2116-09-01 00:55	> 1 mo	0.1233183	0.0803815	226.1615839
EARTH	2119-06-19 21:50	> 1 mo	0.1197334	0.0885144	64.1532282
EARTH	2122-04-20 16:53	> 1 mo	0.1155256	0.0011702	311.7766980

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
319.04003839	115.46090412	0.00255022	MINIMUM
43.66565085	227.55269556	0.08243244	MINIMUM
6.14545319	178.08179322	0.12430271	SADDLE
181.21946426	350.79032003	0.69563743	SADDLE
0.86505602	350.80919515	1.89777086	SADDLE
180.07247178	169.95213657	2.68781752	MAXIMUM

Download:

MOID Plots

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