Asteroids

2012HN40 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.890

Aphelion (Q)

4.522

Eccentricity (e)

0.671

Inclination (i)

14.4

deg

Orbit period (P)

1625.9

Earth MOID

0.07516

U parameter

0.0

Next Earth close approach

Date

2070-05-30

Nominal distance (from Earth center)

0.13613

20364777

Maximum Brightness

18.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.5

mag

Diameter

220 - 500*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2012-04-21

Observatory

Pan-STARRS 1, Haleakala

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

2.705980

1-sigma variation

2.404E-8

Unit

Eccentricity (e)

Value

0.671207

1-sigma variation

1.131E-7

Unit

Inclination (i)

Value

14.3829

1-sigma variation

2.727E-5

Unit

Long. of Ascending Node (Ω)

Value

60.5639

1-sigma variation

1.742E-5

Unit

Arg. of Perihelion (ω)

Value

246.6793

1-sigma variation

4.320E-5

Unit

Mean Anomaly (M)

Value

41.69004

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.889706

1-sigma variation

Unit

Aphelion distance

Value

4.522254

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.036486

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.162822

1-sigma variation

Unit

MOID

Value

0.075156

1-sigma variation

Unit

Orbit Period

Value

1625.8680

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.78028E-16	-6.62970E-16	-1.08925E-13	8.29599E-15	-4.30620E-13	-2.11116E-13
e	-6.62970E-16	1.27968E-14	8.96862E-13	-3.71810E-13	3.65592E-12	-2.17601E-13
i	-1.08925E-13	8.96862E-13	7.43596E-10	-2.73269E-10	8.06516E-10	-4.01448E-11
Ω	8.29599E-15	-3.71810E-13	-2.73269E-10	3.03536E-10	-4.89182E-10	2.42997E-11
ω	-4.30620E-13	3.65592E-12	8.06516E-10	-4.89182E-10	1.86584E-9	-6.02887E-11
M	-2.11116E-13	-2.17601E-13	-4.01448E-11	2.42997E-11	-6.02887E-11	1.32929E-10

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

20.452

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

220 - 500*

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

3309

Unit

Source

[1]

Unobserved

Value

1788

Unit

Source

[1]

Normalized RMS of residuals

Value

0.60933

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2012-04-21.52731

Unit

Source

[2]

Last Observation

Value

2021-05-13.20399

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

121 (4)

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 2012HN40 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	1972-06-02 23:14	< 1 min	0.0702753	0.0702572	0.0000060
EARTH	2012-06-15 20:56	< 1 min	0.1182203	0.1182190	0.0000004
EARTH	2070-05-30 05:37	< 1 min	0.1361301	0.1361131	0.0000057

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
335.44783221	152.79978018	0.07429232	MINIMUM
24.27594798	259.40000629	0.23039561	MINIMUM
6.33649440	220.62001201	0.26200637	SADDLE
0.21537034	26.25696776	1.86245475	SADDLE
180.30130001	25.30361463	3.57067937	SADDLE
179.62536108	204.99542493	5.51735554	MAXIMUM

Download:

MOID Plots

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