Asteroids

2017TD6 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.798

Aphelion (Q)

1.592

Eccentricity (e)

0.332

Inclination (i)

1.9

deg

Orbit period (P)

476.9

Earth MOID

0.00031

U parameter

6.0

Next Earth close approach

Date

2027-04-04

Nominal distance (from Earth center)

0.17409

26043422

Maximum Brightness

26.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

27.2

mag

Diameter

9 - 21*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-10-11

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

1.194612

1-sigma variation

0.000037

Unit

Eccentricity (e)

Value

0.332305

1-sigma variation

0.000043

Unit

Inclination (i)

Value

1.9148

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

26.8077

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

77.8127

1-sigma variation

0.0009

Unit

Mean Anomaly (M)

Value

27.32153

1-sigma variation

0.09019

Unit

Perihelion distance

Value

0.797636

1-sigma variation

Unit

Aphelion distance

Value

1.591587

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.002650

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.137309

1-sigma variation

Unit

MOID

Value

0.000307

1-sigma variation

Unit

Orbit Period

Value

476.9122

1-sigma variation

Unit

U parameter

Value

6.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.33938E-9	1.58294E-9	6.91751E-9	6.73201E-9	3.43158E-8	-3.30060E-6
e	1.58294E-9	1.87156E-9	8.17642E-9	7.96229E-9	4.06875E-8	-3.90081E-6
i	6.91751E-9	8.17642E-9	3.57650E-8	3.47496E-8	1.77430E-7	-1.70466E-5
Ω	6.73201E-9	7.96229E-9	3.47496E-8	3.39345E-8	1.73478E-7	-1.65896E-5
ω	3.43158E-8	4.06875E-8	1.77430E-7	1.73478E-7	9.01787E-7	-8.45657E-5
M	-3.30060E-6	-3.90081E-6	-1.70466E-5	-1.65896E-5	-8.45657E-5	8.13355E-3

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

27.246

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

9 - 21*

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

Unit

Source

[1]

Unobserved

Value

2909

Unit

Source

[1]

Normalized RMS of residuals

Value

0.374867

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-10-11.41171

Unit

Source

[2]

Last Observation

Value

2017-10-19.527745

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

96 (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 2017TD6 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	1953-11-12 04:14	> 1 mo	0.1343731	0.0096126	34.2530008
MARS	1954-06-11 18:44	> 1 mo	0.0314884	0.0050151	30.0196274
MARS	1958-06-18 05:06	> 1 mo	0.0447734	0.0117124	27.3446506
EARTH	1960-04-13 21:42	> 1 mo	0.1484775	0.0053776	52.1460933
EARTH	1976-02-04 07:19	> 1 mo	0.1964588	0.0049417	9.3966849
EARTH	1980-10-12 00:50	> 1 mo	0.1148363	0.0017253	33.1230769
EARTH	1987-03-18 12:31	> 1 mo	0.1226387	0.0005984	12.8181264
EARTH	1991-10-19 21:31	> 1 w	0.0067599	0.0013099	0.3865463
EARTH	2003-04-04 12:48	479.5	0.0069783	0.0067065	0.0013220
EARTH	2008-02-08 00:18	> 1 d	0.1873417	0.1843705	0.0009904
EARTH	2012-12-15 16:16	1216.9	0.1890791	0.1877634	0.0004386
EARTH	2017-10-19 18:52	< 1 s	0.0012780	0.0012775	0.0000002
EARTH	2027-04-04 06:06	156.5	0.1740895	0.1671243	0.0023220
EARTH	2031-01-06 12:38	> 1 d	0.1877469	0.1877174	0.0000099
EARTH	2034-10-09 19:43	285.7	0.1659302	0.1530404	0.0042966
EARTH	2044-03-24 07:10	897.6	0.0132567	0.0131148	0.0011431
MARS	2045-01-08 17:49	844.0	0.0462033	0.0054952	0.0192213
EARTH	2047-11-30 10:43	> 1 mo	0.1547960	0.0535280	0.0343925
EARTH	2061-03-14 20:31	> 1 mo	0.0815189	0.0116881	0.2490583
EARTH	2064-10-30 08:40	> 1 mo	0.0826755	0.0013272	0.2388656
EARTH	2078-02-07 23:42	> 1 w	0.1615892	0.1396330	0.0073214
EARTH	2081-10-18 12:32	> 1 d	0.0229129	0.0006409	0.0969731
EARTH	2091-03-25 23:51	> 1 mo	0.0132663	0.0125807	0.1726798
EARTH	2094-11-24 20:15	> 1 mo	0.1447312	0.0146642	2.5858956
MARS	2095-06-19 14:22	> 1 mo	0.0493447	0.0196817	2.8066365
EARTH	2108-02-11 14:34	> 1 mo	0.1600269	0.0018719	6.8171589
MARS	2108-12-16 22:53	> 1 mo	0.0407295	0.0037417	11.6307111
EARTH	2111-10-19 03:47	> 1 mo	0.0440250	0.0014743	17.2505567
EARTH	2121-03-27 19:54	> 1 mo	0.0201328	0.0121756	19.0834631
EARTH	2124-12-09 12:11	> 1 mo	0.1661762	0.0707224	1.7198800

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
300.06692121	284.97422656	0.00027493	MINIMUM
60.40065975	80.32393740	0.01328482	MINIMUM
0.35379016	2.82338074	0.18823946	SADDLE
180.13981743	182.50549956	0.57669681	SADDLE
0.17256762	182.57067605	1.81372509	SADDLE
180.05576406	2.44451545	2.57481477	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2017TD6

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2081-10-19.735	81421.735	-1.289	0.000	1.49 ± 0.000	6.73E6	3.00E-8	6.33E-2	-8.72	0


Based on 96 optical observations (of which 0 are rejected as outliers) from 2017/10/11.412 to 2017/10/19.528.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.59 and 1.59 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: