Asteroids

2017WJ2 help

Last update: 2026-07-30 14:25 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.784

Aphelion (Q)

1.085

Eccentricity (e)

0.161

Inclination (i)

21.9

deg

Orbit period (P)

329.9

Earth MOID

0.03712

U parameter

6.9

Next Earth close approach

Date

2026-11-05

Nominal distance (from Earth center)

0.04002

5987071

Maximum Brightness

15.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

100 - 230*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-11-18

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

0.934293

1-sigma variation

0.000078

Unit

Eccentricity (e)

Value

0.161142

1-sigma variation

0.000053

Unit

Inclination (i)

Value

21.9352

1-sigma variation

0.0246

Unit

Long. of Ascending Node (Ω)

Value

44.1990

1-sigma variation

0.0117

Unit

Arg. of Perihelion (ω)

Value

223.0762

1-sigma variation

0.0257

Unit

Mean Anomaly (M)

Value

318.88280

1-sigma variation

0.47983

Unit

Perihelion distance

Value

0.783739

1-sigma variation

Unit

Aphelion distance

Value

1.084847

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.039733

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.194036

1-sigma variation

Unit

MOID

Value

0.037115

1-sigma variation

Unit

Orbit Period

Value

329.8551

1-sigma variation

Unit

U parameter

Value

6.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.00914E-9	4.08911E-9	1.90180E-6	9.06129E-7	1.99335E-6	-3.71960E-5
e	4.08911E-9	2.82439E-9	1.30244E-6	6.20737E-7	1.35633E-6	-2.53149E-5
i	1.90180E-6	1.30244E-6	6.03537E-4	2.87597E-4	6.30836E-4	-1.17727E-2
Ω	9.06129E-7	6.20737E-7	2.87597E-4	1.37046E-4	3.00567E-4	-5.60921E-3
ω	1.99335E-6	1.35633E-6	6.30836E-4	3.00567E-4	6.61246E-4	-1.23386E-2
M	-3.71960E-5	-2.53149E-5	-1.17727E-2	-5.60921E-3	-1.23386E-2	2.30240E-1

Date of computation: 2026-07-30 14:25 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

22.046

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

100 - 230*

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

3250

Unit

Source

[1]

Normalized RMS of residuals

Value

0.682392

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-10-28.607706

Unit

Source

[2]

Last Observation

Value

2017-11-23.35979

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

28 (1)

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 2017WJ2 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	1953-04-19 13:56	> 1 d	0.1909763	0.1880078	0.0058655
EARTH	1961-11-05 15:04	> 1 d	0.0728526	0.0408482	0.0402556
EARTH	1970-11-04 16:41	275.4	0.0972893	0.0414060	0.0516986
EARTH	1989-11-07 19:31	> 1 d	0.1392488	0.0611179	0.0300005
EARTH	1990-05-01 01:20	> 1 d	0.1908490	0.1881934	0.0054127
EARTH	1998-11-04 20:27	146.7	0.0416575	0.0379713	0.0062191
EARTH	2007-11-06 01:11	127.3	0.1954720	0.1722043	0.0077953
EARTH	2017-11-10 03:50	< 1 min	0.1877083	0.1871206	0.0001959
EARTH	2018-04-24 22:22	156.0	0.1861142	0.1859557	0.0000550
EARTH	2026-11-05 04:22	94.2	0.0400211	0.0377582	0.0021914
EARTH	2035-11-05 13:33	300.6	0.1533792	0.0981242	0.0189175
EARTH	2046-04-18 18:38	> 1 d	0.1922866	0.1881273	0.0064485
EARTH	2054-11-06 08:15	1210.1	0.0855093	0.0413138	0.0313889
EARTH	2063-11-05 02:54	82.5	0.0732707	0.0390976	0.0328659
EARTH	2082-11-09 07:04	> 1 d	0.1654703	0.0843693	0.0294743
EARTH	2083-04-28 04:10	> 1 d	0.1864540	0.1858581	0.0026929
EARTH	2091-11-05 11:43	392.5	0.0376475	0.0371291	0.0046345
EARTH	2100-11-06 01:46	926.6	0.1598497	0.0442128	0.0581348
EARTH	2111-04-20 13:45	> 1 w	0.1910389	0.1873532	0.0169692
EARTH	2119-11-07 17:54	> 1 d	0.0873225	0.0411757	0.0815381

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
127.89884765	298.70708677	0.03711504	MINIMUM
314.17560657	109.59706582	0.18572797	MINIMUM
227.78954078	23.31234047	0.38565658	SADDLE
35.53414193	204.27527122	0.39952687	SADDLE
13.58894727	356.82910410	1.74827691	SADDLE
170.77738142	153.43832996	2.08557937	MAXIMUM

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MOID Plots

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