Asteroids

2017YJ7 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.553

Aphelion (Q)

1.014

Eccentricity (e)

0.294

Inclination (i)

3.3

deg

Orbit period (P)

253.4

Earth MOID

0.01258

U parameter

8.2

Next Earth close approach

Date

2026-12-10

Nominal distance (from Earth center)

0.03778

5651763

Maximum Brightness

22.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.2

mag

Diameter

15 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-12-28

Observatory

University of Arizona 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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.783752

1-sigma variation

0.000344

Unit

Eccentricity (e)

Value

0.293916

1-sigma variation

0.000614

Unit

Inclination (i)

Value

3.2881

1-sigma variation

0.0087

Unit

Long. of Ascending Node (Ω)

Value

290.3453

1-sigma variation

0.0077

Unit

Arg. of Perihelion (ω)

Value

351.8083

1-sigma variation

0.0078

Unit

Mean Anomaly (M)

Value

234.79112

1-sigma variation

2.93055

Unit

Perihelion distance

Value

0.553395

1-sigma variation

Unit

Aphelion distance

Value

1.014110

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.462061

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.026195

1-sigma variation

Unit

MOID

Value

0.012583

1-sigma variation

Unit

Orbit Period

Value

253.4351

1-sigma variation

Unit

U parameter

Value

8.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.18096E-7	-2.10998E-7	-3.00257E-6	2.63834E-6	-2.68064E-6	-1.00709E-3
e	-2.10998E-7	3.76982E-7	5.36457E-6	-4.71381E-6	4.78938E-6	1.79932E-3
i	-3.00257E-6	5.36457E-6	7.63398E-5	-6.70792E-5	6.81544E-5	2.56049E-2
Ω	2.63834E-6	-4.71381E-6	-6.70792E-5	5.89427E-5	-5.98880E-5	-2.24989E-2
ω	-2.68064E-6	4.78938E-6	6.81544E-5	-5.98880E-5	6.08523E-5	2.28596E-2
M	-1.00709E-3	1.79932E-3	2.56049E-2	-2.24989E-2	2.28596E-2	8.58811E0

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

26.209

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

15 - 30*

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

3210

Unit

Source

[1]

Normalized RMS of residuals

Value

0.604135

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-12-28.45991

Unit

Source

[2]

Last Observation

Value

2018-01-16.14993

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

39 (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 2017YJ7 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	1951-12-07 18:56	1432.2	0.0673218	0.0302282	0.0194955
EARTH	1959-01-31 00:03	291.9	0.0856224	0.0497055	0.0121208
EARTH	1968-01-11 16:00	> 1 d	0.0280357	0.0221775	0.0022422
EARTH	1976-12-07 08:39	> 1 d	0.0604758	0.0314170	0.0171754
EARTH	1984-01-30 10:09	> 1 d	0.0563843	0.0139098	0.0217067
EARTH	1992-12-27 14:07	> 1 d	0.0323671	0.0304391	0.0007060
EARTH	2001-12-06 11:40	640.6	0.0896356	0.0415058	0.0174297
EARTH	2009-01-28 19:09	> 1 d	0.0428225	0.0142277	0.0268773
EARTH	2018-01-07 02:08	< 1 min	0.0303614	0.0301609	0.0000668
EARTH	2026-12-10 10:49	> 1 d	0.0377797	0.0279799	0.0196233
EARTH	2034-01-30 22:53	378.7	0.1007686	0.0166312	0.0536806
EARTH	2043-01-09 18:36	> 1 w	0.0288596	0.0224427	0.0118012
EARTH	2051-12-07 03:59	593.1	0.0814037	0.0307009	0.0215559
EARTH	2059-01-27 22:57	> 1 d	0.0309571	0.0158183	0.0096216
EARTH	2068-01-01 00:55	> 1 w	0.0316692	0.0316680	0.0000916
EARTH	2076-12-07 03:13	> 1 d	0.0661165	0.0289743	0.0426072
EARTH	2084-01-31 00:32	1141.9	0.0754137	0.0185785	0.0264658
EARTH	2093-01-12 08:20	> 1 d	0.0261650	0.0198840	0.0047511
EARTH	2101-12-08 14:34	> 1 d	0.0599409	0.0273596	0.0408051
EARTH	2109-01-30 15:29	> 1 d	0.0590455	0.0168192	0.0389580
EARTH	2117-12-29 21:17	654.5	0.0311541	0.0300212	0.0004470
EARTH	2126-12-07 15:02	722.9	0.1021516	0.0300847	0.0346710

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
207.13018810	17.65119383	0.01258311	MINIMUM
155.87776223	340.17041749	0.02678705	MINIMUM
176.57378961	355.31122134	0.03197886	SADDLE
0.03488623	177.74046878	0.46347992	SADDLE
0.14762941	357.89981067	1.53690225	SADDLE
180.15621155	177.91258064	2.03092828	MAXIMUM

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MOID Plots

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