Asteroids

2012HK help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.053

Aphelion (Q)

1.902

Eccentricity (e)

0.288

Inclination (i)

17.2

deg

Orbit period (P)

655.9

Earth MOID

0.05262

U parameter

7.2

Next Earth close approach

Date

2082-04-24

Nominal distance (from Earth center)

0.14705

21998594

Maximum Brightness

21.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.5

mag

Diameter

50 - 120*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2012-04-16

Observatory

University of Arizona Catalina Sky Survey

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

1.477424

1-sigma variation

0.000332

Unit

Eccentricity (e)

Value

0.287523

1-sigma variation

0.000140

Unit

Inclination (i)

Value

17.2230

1-sigma variation

0.0073

Unit

Long. of Ascending Node (Ω)

Value

206.5954

1-sigma variation

0.0021

Unit

Arg. of Perihelion (ω)

Value

350.0065

1-sigma variation

0.0128

Unit

Mean Anomaly (M)

Value

319.33137

1-sigma variation

1.11905

Unit

Perihelion distance

Value

1.052631

1-sigma variation

Unit

Aphelion distance

Value

1.902217

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.052784

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.894230

1-sigma variation

Unit

MOID

Value

0.052615

1-sigma variation

Unit

Orbit Period

Value

655.9278

1-sigma variation

Unit

U parameter

Value

7.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.09991E-7	4.65173E-8	2.42157E-6	-6.98505E-7	4.23780E-6	-3.71132E-4
e	4.65173E-8	1.96731E-8	1.02413E-6	-2.95411E-7	1.79222E-6	-1.56959E-4
i	2.42157E-6	1.02413E-6	5.33164E-5	-1.53784E-5	9.32949E-5	-8.17088E-3
Ω	-6.98505E-7	-2.95411E-7	-1.53784E-5	4.43596E-6	-2.69128E-5	2.35690E-3
ω	4.23780E-6	1.79222E-6	9.32949E-5	-2.69128E-5	1.63314E-4	-1.42992E-2
M	-3.71132E-4	-1.56959E-4	-8.17088E-3	2.35690E-3	-1.42992E-2	1.25227E0

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

23.478

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

50 - 120*

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

5124

Unit

Source

[1]

Normalized RMS of residuals

Value

0.403908

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2012-04-16.2611

Unit

Source

[2]

Last Observation

Value

2012-05-23.307695

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

91 (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 2012HK 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	1951-04-04 21:38	> 1 d	0.1997665	0.0258526	0.1027955
EARTH	2003-04-24 21:32	> 1 d	0.1501472	0.0836248	0.0228486
EARTH	2012-04-16 19:35	< 1 min	0.0548459	0.0547730	0.0000243
EARTH	2021-04-11 04:18	> 1 d	0.0974921	0.0493040	0.0206535
EARTH	2082-04-24 16:54	> 1 d	0.1470515	0.0385627	0.0883850
EARTH	2091-04-17 20:50	> 1 d	0.0557952	0.0521180	0.0266559
EARTH	2100-04-12 19:51	> 1 w	0.0874757	0.0481803	0.1198317

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
6.92250810	103.72922167	0.05073801	MINIMUM
178.04763460	274.88410597	0.90619343	SADDLE
1.93227085	277.30891544	2.05070389	SADDLE
182.46204056	98.02762640	2.90420421	MAXIMUM

Download:

MOID Plots

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