Asteroids

2012DF31 help

Last update: 2026-02-20 13:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.582

Aphelion (Q)

1.634

Eccentricity (e)

0.475

Inclination (i)

1.6

deg

Orbit period (P)

425.9

Earth MOID

0.02334

U parameter

0.4

Next Earth close approach

Date

2026-03-08

Nominal distance (from Earth center)

0.03441

5148290

Maximum Brightness

20.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.5

mag

Diameter

30 - 70*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2012-02-24

Observatory

Mt. Lemmon 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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.107814

1-sigma variation

6.142E-9

Unit

Eccentricity (e)

Value

0.474717

1-sigma variation

0.000001

Unit

Inclination (i)

Value

1.5732

1-sigma variation

2.390E-5

Unit

Long. of Ascending Node (Ω)

Value

109.3585

1-sigma variation

0.0008

Unit

Arg. of Perihelion (ω)

Value

165.5080

1-sigma variation

0.0008

Unit

Mean Anomaly (M)

Value

218.96396

1-sigma variation

0.00003

Unit

Perihelion distance

Value

0.581916

1-sigma variation

Unit

Aphelion distance

Value

1.633712

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.604966

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.430137

1-sigma variation

Unit

MOID

Value

0.023340

1-sigma variation

Unit

Orbit Period

Value

425.8914

1-sigma variation

Unit

U parameter

Value

0.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.77226E-17	6.38216E-15	2.11758E-14	4.09628E-14	5.69988E-13	1.29261E-13
e	6.38216E-15	1.38347E-12	1.35197E-11	3.05485E-10	-1.65163E-10	2.60657E-11
i	2.11758E-14	1.35197E-11	5.71077E-10	1.87208E-8	-1.70471E-8	8.12802E-11
Ω	4.09628E-14	3.05485E-10	1.87208E-8	6.54681E-7	-6.13914E-7	2.68146E-10
ω	5.69988E-13	-1.65163E-10	-1.70471E-8	-6.13914E-7	5.87674E-7	2.19681E-9
M	1.29261E-13	2.60657E-11	8.12802E-11	2.68146E-10	2.19681E-9	6.45601E-10

Date of computation: 2026-02-20 13:30 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

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

24.53

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

30 - 70*

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

5118

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.51099

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2012-02-16.523985

Unit

Source

[2]

Last Observation

Value

2026-02-20.136273

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

59 (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 2012DF31 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	1984-03-14 15:13	< 1 min	0.1936838	0.1936803	0.0000012
VENUS	1988-12-18 07:14	< 1 min	0.0405539	0.0405473	0.0000022
EARTH	1991-03-14 18:32	< 1 min	0.1616638	0.1616583	0.0000019
EARTH	1998-03-12 21:43	< 1 min	0.1052242	0.1052204	0.0000012
EARTH	2005-03-11 14:21	< 1 min	0.0761122	0.0761100	0.0000007
VENUS	2011-02-10 22:11	< 1 min	0.0350703	0.0350686	0.0000006
EARTH	2012-03-10 11:38	< 1 min	0.0547843	0.0547831	0.0000004
EARTH	2019-03-09 12:43	< 1 min	0.0238303	0.0238298	0.0000002
EARTH	2026-03-08 03:26	< 1 min	0.0344142	0.0344135	0.0000002
EARTH	2033-03-05 02:53	< 1 min	0.0963979	0.0963953	0.0000009
VENUS	2042-09-22 09:57	< 1 min	0.0269543	0.0269539	0.0000001
EARTH	2042-10-21 07:20	< 1 min	0.1318871	0.1318765	0.0000035
VENUS	2043-09-26 01:33	< 1 min	0.0423381	0.0423346	0.0000012
EARTH	2049-10-17 21:35	< 1 min	0.0598723	0.0598489	0.0000078
EARTH	2056-10-15 18:34	< 1 min	0.0282465	0.0282392	0.0000025
MARS	2060-07-14 15:06	3.9	0.0446332	0.0446257	0.0000025
EARTH	2063-10-15 13:09	1.5	0.0331599	0.0331058	0.0000181
VENUS	2064-11-11 04:46	6.1	0.0470327	0.0469290	0.0000346
VENUS	2065-11-15 05:01	5.5	0.0146705	0.0145961	0.0000249
MARS	2070-02-17 23:42	16.0	0.0464745	0.0464126	0.0000208
EARTH	2070-10-13 22:43	8.2	0.0568599	0.0564359	0.0001415
EARTH	2077-10-12 04:20	13.9	0.0956643	0.0948246	0.0002800
EARTH	2084-10-10 01:35	11.8	0.1508926	0.1498686	0.0003414
VENUS	2088-01-06 14:40	39.1	0.0188880	0.0179890	0.0003050
MARS	2094-07-29 07:39	21.4	0.0453952	0.0453717	0.0000082
VENUS	2097-06-22 16:41	58.8	0.0307078	0.0299946	0.0002464
VENUS	2098-06-24 19:14	85.1	0.0195862	0.0180289	0.0005332
EARTH	2104-03-15 08:12	31.9	0.1541583	0.1513727	0.0009287
MARS	2109-06-05 11:27	125.3	0.0466633	0.0462535	0.0001473
EARTH	2111-03-12 20:39	61.6	0.0592101	0.0561566	0.0010229
EARTH	2118-03-10 07:46	43.5	0.0245094	0.0241460	0.0001519
MARS	2119-01-14 12:52	87.1	0.0476776	0.0471432	0.0001839
EARTH	2125-03-06 13:42	115.4	0.0948742	0.0892303	0.0018856

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
282.48327592	65.89792267	0.02333995	MINIMUM
77.84553227	281.60323637	0.02732687	MINIMUM
0.29901316	173.88333530	0.43617649	SADDLE
180.09258523	353.68814548	0.65011968	SADDLE
0.31716778	353.92108458	1.56555388	SADDLE
180.13269162	173.71408762	2.65175701	MAXIMUM

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MOID Plots

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