Asteroids

2012TN20 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.726

Aphelion (Q)

1.639

Eccentricity (e)

0.386

Inclination (i)

11.6

deg

Orbit period (P)

469.8

Earth MOID

0.13852

U parameter

2.4

Next Earth close approach

Date

2027-04-15

Nominal distance (from Earth center)

0.13794

20635108

Maximum Brightness

22.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

22.4

mag

Diameter

90 - 200*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2012-10-07

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.182639

1-sigma variation

1.952E-7

Unit

Eccentricity (e)

Value

0.385942

1-sigma variation

0.000001

Unit

Inclination (i)

Value

11.6168

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

348.7402

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

139.1177

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

7.04762

1-sigma variation

0.00022

Unit

Perihelion distance

Value

0.726209

1-sigma variation

Unit

Aphelion distance

Value

1.639070

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.413926

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.214817

1-sigma variation

Unit

MOID

Value

0.138523

1-sigma variation

Unit

Orbit Period

Value

469.7610

1-sigma variation

Unit

U parameter

Value

2.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.80844E-14	-1.89267E-13	-2.86490E-12	-3.65275E-15	-1.92281E-11	-4.14389E-11
e	-1.89267E-13	1.00069E-12	2.36652E-11	9.53003E-12	1.03224E-10	1.96025E-10
i	-2.86490E-12	2.36652E-11	3.82108E-9	5.56136E-9	-4.93385E-10	7.36513E-10
Ω	-3.65275E-15	9.53003E-12	5.56136E-9	9.65571E-9	-5.21051E-9	-3.13175E-9
ω	-1.92281E-11	1.03224E-10	-4.93385E-10	-5.21051E-9	1.58849E-8	2.08184E-8
M	-4.14389E-11	1.96025E-10	7.36513E-10	-3.13175E-9	2.08184E-8	4.70674E-8

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

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

22.4

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

90 - 200*

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

3310

Unit

Source

[1]

Unobserved

Value

1465

Unit

Source

[1]

Normalized RMS of residuals

Value

0.456064

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2012-10-07.400541

Unit

Source

[2]

Last Observation

Value

2021-10-30.85684

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

44 (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 2012TN20 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
VENUS	1964-04-04 07:10	1.3	0.0290607	0.0290456	0.0000050
VENUS	1979-08-26 09:20	< 1 min	0.0354129	0.0354102	0.0000009
EARTH	1991-04-28 05:37	< 1 min	0.1866918	0.1866873	0.0000015
EARTH	2000-04-22 05:09	< 1 min	0.1507671	0.1507645	0.0000009
EARTH	2003-10-27 16:20	< 1 min	0.1812520	0.1812499	0.0000007
EARTH	2009-04-16 19:20	< 1 min	0.1374574	0.1374549	0.0000008
EARTH	2012-10-27 04:47	< 1 min	0.1618959	0.1618940	0.0000007
EARTH	2018-04-15 05:56	< 1 min	0.1374199	0.1374162	0.0000012
EARTH	2021-10-27 08:39	< 1 min	0.1573505	0.1573485	0.0000007
VENUS	2023-04-28 13:52	< 1 min	0.0231662	0.0231616	0.0000016
EARTH	2027-04-15 13:19	1.4	0.1379372	0.1379326	0.0000015
EARTH	2030-10-27 21:38	< 1 min	0.1615778	0.1615643	0.0000045
EARTH	2036-04-17 00:08	3.6	0.1381714	0.1381681	0.0000011
VENUS	2037-06-20 07:30	5.0	0.0246485	0.0246161	0.0000108
EARTH	2039-10-28 09:10	< 1 min	0.1664529	0.1663689	0.0000280
EARTH	2045-04-16 16:22	23.4	0.1385381	0.1385280	0.0000036
EARTH	2048-10-27 15:36	3.3	0.1634374	0.1631821	0.0000855
EARTH	2054-04-15 04:37	48.0	0.1388465	0.1387944	0.0000183
EARTH	2057-10-27 10:28	8.6	0.1547061	0.1545098	0.0000664
EARTH	2063-04-10 02:13	79.4	0.1461760	0.1458723	0.0001026
EARTH	2066-10-26 11:49	16.9	0.1523084	0.1521817	0.0000441
EARTH	2072-04-01 07:30	128.0	0.1641210	0.1635571	0.0001894
EARTH	2075-10-24 23:39	23.0	0.1682217	0.1675781	0.0002164
VENUS	2081-02-27 16:23	81.0	0.0436695	0.0420096	0.0005558
EARTH	2081-03-21 09:22	192.8	0.1918043	0.1911011	0.0002357
EARTH	2084-10-22 18:45	12.2	0.1912926	0.1907569	0.0001790
EARTH	2090-03-19 07:30	25.3	0.1972831	0.1972044	0.0000262
VENUS	2095-04-15 11:24	90.9	0.0433379	0.0421110	0.0004100

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
57.25802563	102.77368872	0.13776386	MINIMUM
288.67623959	291.57902181	0.15059027	MINIMUM
349.72339834	10.55346925	0.28823711	SADDLE
176.03892910	203.81310012	0.64829461	SADDLE
359.69994553	205.19682745	1.73717954	SADDLE
181.65734778	27.56981447	2.61912873	MAXIMUM

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MOID Plots

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