Asteroids

141593 2002HK12 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.944

Aphelion (Q)

3.061

Eccentricity (e)

0.529

Inclination (i)

2.3

deg

Orbit period (P)

1034.8

Earth MOID

0.02404

U parameter

0.0

Next Earth close approach

Date

2036-08-10

Nominal distance (from Earth center)

0.06736

10076369

Maximum Brightness

26.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.3

mag

Diameter

390

Taxonomic type

Rotation period (T)

12.69

Discovery Information

Discovery Date

2002-04-30

Observatory

Palomar Mountain/NEAT

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.002219

1-sigma variation

7.988E-10

Unit

Eccentricity (e)

Value

0.528654

1-sigma variation

3.428E-9

Unit

Inclination (i)

Value

2.3484

1-sigma variation

1.668E-6

Unit

Long. of Ascending Node (Ω)

Value

306.9731

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

2.2781

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

80.40267

1-sigma variation

1.011E-6

Unit

Perihelion distance

Value

0.943738

1-sigma variation

Unit

Aphelion distance

Value

3.060700

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.072407

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.072914

1-sigma variation

Unit

MOID

Value

0.024039

1-sigma variation

Unit

Orbit Period

Value

1034.8221

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.38053E-19	-1.26482E-18	-2.16406E-17	-2.79792E-14	2.79224E-14	-4.12464E-16
e	-1.26482E-18	1.17484E-17	1.97560E-15	1.72050E-13	-1.78084E-13	2.67168E-15
i	-2.16406E-17	1.97560E-15	2.78119E-12	5.17473E-11	-5.20361E-11	1.22766E-13
Ω	-2.79792E-14	1.72050E-13	5.17473E-11	3.67833E-9	-3.68410E-9	2.31364E-11
ω	2.79224E-14	-1.78084E-13	-5.20361E-11	-3.68410E-9	3.69956E-9	-2.57928E-11
M	-4.12464E-16	2.67168E-15	1.22766E-13	2.31364E-11	-2.57928E-11	1.02122E-12

Date of computation: 2025-09-10 00:30 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

12.69

Unit

Source

[4]

Quality

Value

Unit

Source

[4]

Amplitude

Value

1.33

1.5

Unit

mag

Source

[1]

[4]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[1]

Spinvector B

Value

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

Taxonomy (all)

Value

Unit

Source

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.22

18.276

Unit

mag

Source

[5]

[6]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.507

0.24

0.17

Unit

Source

[7]

[5]

[8]

Diameter

Value

390

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[9]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Near-Earth Asteroid Lightcurve Analysis at the Center for Solar System Studies: 2019 September-2020 January, B.D. Warner
[2]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[5]	EARN	1.) Wolters, S.D. et al. (2005) Icarus 175, 92-110. (Optical and thermal infrared observations of six near-Earth asteroids in 2002) (6455, 1999 HF1, 2000 ED104, 2002 HK12, 2002 NX18, 2002 QE15)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[8]	EARN	1.) Delbo, M. et al. (2011) Icarus 212, 138-148. (The cool surfaces of binary near-Earth asteroids) (5381,153591, 164121)
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

13710

Unit

Source

[1]

Unobserved

Value

1041

Unit

Source

[1]

Normalized RMS of residuals

Value

0.4081

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1985-06-11.35016

Unit

Source

[2]

Last Observation

Value

2022-12-24.23953

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1488 (8)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2002-08-19

Unit

Source

[3]

Last Observation

Value

2019-08-14

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

5 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 141593 2002HK12 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	1951-06-15 14:25	< 1 min	0.0573789	0.0573783	0.0000002
EARTH	1968-07-21 01:04	< 1 min	0.0680186	0.0680185	0.0000000
EARTH	1985-08-29 15:37	< 1 min	0.0407753	0.0407753	0.0000000
EARTH	2002-08-27 08:07	< 1 min	0.0486961	0.0486961	0.0000000
EARTH	2019-08-17 00:51	< 1 s	0.0622648	0.0622648	0.0000000
EARTH	2036-08-10 04:40	< 1 min	0.0673564	0.0673563	0.0000000
EARTH	2053-07-12 11:35	< 1 min	0.0610817	0.0610816	0.0000000
EARTH	2070-06-22 03:10	< 1 min	0.0259879	0.0259877	0.0000001
EARTH	2118-09-09 05:22	< 1 min	0.0268465	0.0268465	0.0000000

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
339.22877677	170.32395090	0.02379933	MINIMUM
19.42679553	242.06018899	0.02479204	MINIMUM
359.32249531	206.21093768	0.07109265	SADDLE
359.30958068	26.17429963	1.92880912	SADDLE
179.78510998	26.73064452	2.07455379	SADDLE
179.77479105	206.72095307	4.07444847	MAXIMUM

Download:

MOID Plots

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