Asteroids

2017EL4 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.705

Aphelion (Q)

3.139

Eccentricity (e)

0.633

Inclination (i)

1.5

deg

Orbit period (P)

973.1

Earth MOID

0.02060

U parameter

9.0

Next Earth close approach

Date

2033-03-03

Nominal distance (from Earth center)

0.03191

4774158

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.921741

1-sigma variation

0.027484

Unit

Eccentricity (e)

Value

0.633191

1-sigma variation

0.003484

Unit

Inclination (i)

Value

1.4613

1-sigma variation

0.0513

Unit

Long. of Ascending Node (Ω)

Value

110.0418

1-sigma variation

1.9884

Unit

Arg. of Perihelion (ω)

Value

339.4043

1-sigma variation

0.9395

Unit

Mean Anomaly (M)

Value

187.10042

1-sigma variation

8.62745

Unit

Perihelion distance

Value

0.704913

1-sigma variation

Unit

Aphelion distance

Value

3.138569

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.260895

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.812100

1-sigma variation

Unit

MOID

Value

0.020599

1-sigma variation

Unit

Orbit Period

Value

973.0623

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.55346E-4	9.57582E-5	1.40917E-3	5.46485E-2	-2.58205E-2	-2.37113E-1
e	9.57582E-5	1.21396E-5	1.78646E-4	6.92801E-3	-3.27337E-3	-3.00598E-2
i	1.40917E-3	1.78646E-4	2.62895E-3	1.01952E-1	-4.81709E-2	-4.42358E-1
Ω	5.46485E-2	6.92801E-3	1.01952E-1	3.95377E0	-1.86810E0	-1.71549E1
ω	-2.58205E-2	-3.27337E-3	-4.81709E-2	-1.86810E0	8.82651E-1	8.10541E0
M	-2.37113E-1	-3.00598E-2	-4.42358E-1	-1.71549E1	8.10541E0	7.44329E1

Date of computation: 2026-03-17 23:26 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

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

3294

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

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 2017EL4 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	1952-10-12 09:23	> 1 mo	0.0817387	0.0256365	0.3529078
VENUS	1955-08-08 22:34	> 1 mo	0.0486034	0.0244903	0.2140544
EARTH	1960-10-08 23:39	> 1 w	0.0508207	0.0251572	0.1295967
VENUS	1963-08-07 20:52	> 1 mo	0.0466359	0.0245718	0.2765708
EARTH	1968-10-14 01:19	> 1 mo	0.0955847	0.0258282	0.4450317
10 Hygiea	1978-09-28 13:13	> 1 w	0.0158117	0.0120724	0.1328720
EARTH	2009-02-25 08:08	> 1 w	0.0906122	0.0211466	0.1935933
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	0.1967365
EARTH	2025-03-05 13:36	> 1 w	0.0208132	0.0206387	0.0261237
VENUS	2033-01-02 05:15	> 1 mo	0.0494432	0.0047250	1.2812522
EARTH	2033-03-03 15:22	> 1 mo	0.0319133	0.0207500	0.9619962
MARS	2051-12-06 12:38	> 1 mo	0.0202600	0.0202551	0.0076182
EARTH	2064-10-20 01:59	> 1 mo	0.1297194	0.0260203	4.5078541
EARTH	2072-10-02 12:46	> 1 mo	0.0673274	0.0254039	5.5818924
VENUS	2083-07-01 09:49	> 1 mo	0.0168237	0.0000808	0.0311508
EARTH	2110-03-18 06:55	> 1 mo	0.1770398	0.0221975	3.5959431
EARTH	2118-03-06 16:46	> 1 mo	0.0249143	0.0214870	1.1160369

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
40.19608170	62.59200285	0.02069262	MINIMUM
319.24498297	272.93598228	0.02530212	MINIMUM
359.58117506	347.55600955	0.27934472	SADDLE
359.61648507	167.63872830	1.72244254	SADDLE
179.91140961	168.03275330	2.12075968	SADDLE
179.92489792	348.04140600	4.12236905	MAXIMUM

Download:

MOID Plots

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