Asteroids

2017EL4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.705

Aphelion (Q)

3.138

Eccentricity (e)

0.633

Inclination (i)

1.5

deg

Orbit period (P)

972.9

Earth MOID

0.02069

U parameter

9.0

Next Earth close approach

Date

2033-03-03

Nominal distance (from Earth center)

0.03191

4774159

Maximum Brightness

21.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.7

mag

Diameter

20 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-03-08

Observatory

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.921586

1-sigma variation

0.027469

Unit

Eccentricity (e)

Value

0.633280

1-sigma variation

0.003484

Unit

Inclination (i)

Value

1.4613

1-sigma variation

0.0513

Unit

Long. of Ascending Node (Ω)

Value

110.0421

1-sigma variation

1.9888

Unit

Arg. of Perihelion (ω)

Value

339.3967

1-sigma variation

0.9404

Unit

Mean Anomaly (M)

Value

113.12131

1-sigma variation

7.04072

Unit

Perihelion distance

Value

0.704684

1-sigma variation

Unit

Aphelion distance

Value

3.138488

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.261321

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.811304

1-sigma variation

Unit

MOID

Value

0.020693

1-sigma variation

Unit

Orbit Period

Value

972.9447

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.54546E-4	9.57085E-5	1.40823E-3	5.46295E-2	-2.58310E-2	-1.93402E-1
e	9.57085E-5	1.21399E-5	1.78623E-4	6.92933E-3	-3.27647E-3	-2.45315E-2
i	1.40823E-3	1.78623E-4	2.62822E-3	1.01957E-1	-4.82093E-2	-3.60951E-1
Ω	5.46295E-2	6.92933E-3	1.01957E-1	3.95521E0	-1.87019E0	-1.40024E1
ω	-2.58310E-2	-3.27647E-3	-4.82093E-2	-1.87019E0	8.84304E-1	6.62088E0
M	-1.93402E-1	-2.45315E-2	-3.60951E-1	-1.40024E1	6.62088E0	4.95718E1

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

25.669

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

20 - 40*

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

Unit

Source

[1]

Unobserved

Value

3107

Unit

Source

[1]

Normalized RMS of residuals

Value

0.834542

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-03-05.076959

Unit

Source

[2]

Last Observation

Value

2017-03-17.302294

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

46 (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 2017EL4 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	1952-10-12 09:23	> 1 mo	0.0817387	0.0256365	0.3529252
VENUS	1955-08-08 22:34	> 1 mo	0.0486034	0.0244903	0.2140650
EARTH	1960-10-08 23:39	> 1 w	0.0508207	0.0251572	0.1296031
VENUS	1963-08-07 20:52	> 1 mo	0.0466359	0.0245718	0.2765844
EARTH	1968-10-14 01:19	> 1 mo	0.0955847	0.0258282	0.4450537
10 Hygiea	1978-09-28 13:13	> 1 w	0.0158117	0.0120724	0.1328784
EARTH	2009-02-25 08:08	> 1 w	0.0906122	0.0211466	0.1936028
EARTH	2017-03-04 21:32	< 1 s	0.0210730	0.0209594	0.0000379
VENUS	2025-01-04 09:51	> 1 w	0.0372520	0.0052425	0.1967463
EARTH	2025-03-05 13:36	> 1 w	0.0208132	0.0206387	0.0261250
VENUS	2033-01-02 05:15	> 1 mo	0.0494432	0.0047250	1.2813157
EARTH	2033-03-03 15:22	> 1 mo	0.0319133	0.0207500	0.9620440
MARS	2051-12-06 12:38	> 1 mo	0.0202600	0.0202551	0.0076193
EARTH	2064-10-20 01:59	> 1 mo	0.1297194	0.0260203	4.5080797
EARTH	2072-10-02 12:46	> 1 mo	0.0673274	0.0254039	5.5821717
VENUS	2083-07-01 09:49	> 1 mo	0.0168237	0.0000809	0.0311527
EARTH	2110-03-18 06:55	> 1 mo	0.1770398	0.0221975	3.5961304
EARTH	2118-03-06 16:46	> 1 mo	0.0249143	0.0214870	1.1160988

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
40.15905174	61.65784270	0.02069094	MINIMUM
319.27406187	271.98244149	0.02530615	MINIMUM
359.57579204	346.61036943	0.27962351	SADDLE
359.61146461	166.69350096	1.72040166	SADDLE
179.91018831	167.09241811	2.12240723	SADDLE
179.92352091	347.10089644	4.12225541	MAXIMUM

Download:

MOID Plots

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