Asteroids

2017TD6 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.194647

1-sigma variation

0.000036

Unit

Eccentricity (e)

Value

0.332261

1-sigma variation

0.000043

Unit

Inclination (i)

Value

1.9148

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

26.8055

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

77.8213

1-sigma variation

0.0009

Unit

Mean Anomaly (M)

Value

178.28482

1-sigma variation

0.09708

Unit

Perihelion distance

Value

0.797713

1-sigma variation

Unit

Aphelion distance

Value

1.591582

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.002689

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.138722

1-sigma variation

Unit

MOID

Value

0.000311

1-sigma variation

Unit

Orbit Period

Value

476.9337

1-sigma variation

Unit

U parameter

Value

6.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.33070E-9	1.57718E-9	6.89702E-9	6.78305E-9	3.36071E-8	-3.54145E-6
e	1.57718E-9	1.87009E-9	8.17553E-9	8.04553E-9	3.99635E-8	-4.19743E-6
i	6.89702E-9	8.17553E-9	3.57853E-8	3.51372E-8	1.74384E-7	-1.83553E-5
Ω	6.78305E-9	8.04553E-9	3.51372E-8	3.46735E-8	1.72305E-7	-1.80521E-5
ω	3.36071E-8	3.99635E-8	1.74384E-7	1.72305E-7	8.71359E-7	-8.94420E-5
M	-3.54145E-6	-4.19743E-6	-1.83553E-5	-1.80521E-5	-8.94420E-5	9.42497E-3

Date of computation: 2026-06-04 23:11 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

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

3206

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

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 2017TD6 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	1953-11-12 04:14	> 1 mo	0.1343732	0.0096128	34.2529962
MARS	1954-06-11 18:44	> 1 mo	0.0314884	0.0050151	30.0196337
MARS	1958-06-18 05:06	> 1 mo	0.0447734	0.0117124	27.3446490
EARTH	1960-04-13 21:42	> 1 mo	0.1484775	0.0053776	52.1460968
EARTH	1976-02-04 07:19	> 1 mo	0.1964588	0.0049417	9.3966905
EARTH	1980-10-12 00:50	> 1 mo	0.1148362	0.0017253	33.1230875
EARTH	1987-03-18 12:31	> 1 mo	0.1226386	0.0005984	12.8181318
EARTH	1991-10-19 21:31	> 1 w	0.0067599	0.0013099	0.3865464
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	0.1659303	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	0.0815190	0.0116881	0.2490584
EARTH	2064-10-30 08:40	> 1 mo	0.0826755	0.0013272	0.2388657
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	0.0969732
EARTH	2091-03-25 23:51	> 1 mo	0.0132663	0.0125807	0.1726790
EARTH	2094-11-24 20:15	> 1 mo	0.1447311	0.0146641	2.5859123
MARS	2095-06-19 14:22	> 1 mo	0.0493448	0.0196817	2.8066492
EARTH	2108-02-11 14:34	> 1 mo	0.1600272	0.0018719	6.8171370
MARS	2108-12-16 22:53	> 1 mo	0.0407290	0.0037417	11.6307746
EARTH	2111-10-19 03:47	> 1 mo	0.0440258	0.0014743	17.2506159
EARTH	2121-03-27 19:54	> 1 mo	0.0201337	0.0121755	19.0828917
EARTH	2124-12-09 12:11	> 1 mo	0.1661763	0.0707683	1.7186283

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
300.00668335	285.88033553	0.00030656	MINIMUM
60.57095603	81.38944223	0.01317180	MINIMUM
0.42195515	3.82269771	0.18819044	SADDLE
180.17446889	183.46990190	0.57496071	SADDLE
0.24444046	183.57446254	1.81553268	SADDLE
180.08914475	3.40750752	2.57483499	MAXIMUM

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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: