Asteroids

2015HM1 help

Last update: 2025-07-15 00:51 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.887

Aphelion (Q)

1.283

Eccentricity (e)

0.182

Inclination (i)

18.7

deg

Orbit period (P)

412.8

Earth MOID

0.01015

U parameter

7.5

Next Earth close approach

Date

2032-05-01

Nominal distance (from Earth center)

0.16309

24397528

Maximum Brightness

23.7

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.2

mag

Diameter

24 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-04-18

Observatory

Cerro Tololo-DECam

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

1.085011

1-sigma variation

0.000254

Unit

Eccentricity (e)

Value

0.182180

1-sigma variation

0.000194

Unit

Inclination (i)

Value

18.7359

1-sigma variation

0.0371

Unit

Long. of Ascending Node (Ω)

Value

211.9514

1-sigma variation

0.0082

Unit

Arg. of Perihelion (ω)

Value

111.7424

1-sigma variation

0.2268

Unit

Mean Anomaly (M)

Value

219.01498

1-sigma variation

1.27121

Unit

Perihelion distance

Value

0.887344

1-sigma variation

Unit

Aphelion distance

Value

1.282678

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.119649

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.011526

1-sigma variation

Unit

MOID

Value

0.010154

1-sigma variation

Unit

Orbit Period

Value

412.8095

1-sigma variation

Unit

U parameter

Value

7.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.45932E-8	-4.92229E-8	-9.41321E-6	2.09121E-6	5.76338E-5	3.23081E-4
e	-4.92229E-8	3.75171E-8	7.17534E-6	-1.59388E-6	-4.39164E-5	-2.46207E-4
i	-9.41321E-6	7.17534E-6	1.37294E-3	-3.04913E-4	-8.39711E-3	-4.70848E-2
Ω	2.09121E-6	-1.59388E-6	-3.04913E-4	6.77252E-5	1.86563E-3	1.04600E-2
ω	5.76338E-5	-4.39164E-5	-8.39711E-3	1.86563E-3	5.14275E-2	2.88268E-1
M	3.23081E-4	-2.46207E-4	-4.70848E-2	1.04600E-2	2.88268E-1	1.61598E0

Date of computation: 2025-07-15 00:51 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

25.235

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

24 - 50*

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

3734

Unit

Source

[1]

Normalized RMS of residuals

Value

0.51549

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-04-18.04783

Unit

Source

[2]

Last Observation

Value

2015-04-28.421353

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

23 (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 2015HM1 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	1954-05-02 01:06	> 1 d	0.1194470	0.0998347	0.3936749
EARTH	1963-04-28 13:53	> 1 w	0.1372125	0.1053095	0.2931034
EARTH	1972-10-16 10:23	> 1 w	0.1625193	0.0217388	0.2184868
EARTH	1981-10-26 22:04	> 1 d	0.0166608	0.0097069	0.0709545
EARTH	1989-05-01 23:04	924.9	0.1057304	0.1015799	0.0172712
EARTH	1998-10-16 10:18	> 1 d	0.1681727	0.0299120	0.0493983
EARTH	2007-11-02 17:49	> 1 d	0.1410215	0.0635972	0.0259628
EARTH	2015-04-29 14:22	< 1 min	0.1294016	0.1286903	0.0002371
EARTH	2024-10-24 02:30	> 1 d	0.0384800	0.0103781	0.0287671
EARTH	2032-05-01 18:06	102.2	0.1630874	0.1321670	0.0111152
EARTH	2041-04-27 22:07	469.5	0.1443786	0.1300807	0.0049521
EARTH	2050-10-22 10:40	> 1 d	0.0771656	0.0134309	0.0304499
EARTH	2059-11-03 09:58	> 1 d	0.1524253	0.0436901	0.0367197
EARTH	2067-05-01 10:18	1181.6	0.1043437	0.1004482	0.0087382
EARTH	2076-10-14 12:56	> 1 d	0.1856220	0.0682571	0.0401035
EARTH	2085-10-28 22:12	> 1 d	0.0486878	0.0114343	0.0389586
EARTH	2093-05-02 01:57	49.3	0.1045542	0.1036777	0.0006129
EARTH	2102-10-15 04:06	> 1 d	0.1963258	0.0410847	0.0552334
EARTH	2111-11-01 05:07	> 1 d	0.0824263	0.0132726	0.0995441
EARTH	2119-05-02 21:47	> 1 d	0.1043973	0.1027346	0.0162510

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
59.63031742	291.42690072	0.01015416	MINIMUM
268.15013872	117.89574517	0.10032016	MINIMUM
342.88759812	201.42705918	0.33242096	SADDLE
164.18987591	28.38829918	0.46257653	SADDLE
352.71041611	34.00697169	1.85165677	SADDLE
182.70109359	224.34084443	2.26896928	MAXIMUM

Download:

MOID Plots

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