Asteroids

2017EL4 help

Last update: 2025-02-09 18:08 UTC

Orbital Properties

Epoch

60600.0

MJD

Orbit type

Apollo

Perihelion (q)

0.705

Aphelion (Q)

3.142

Eccentricity (e)

0.634

Inclination (i)

1.5

deg

Orbit period (P)

974.2

Earth MOID

0.02057

U parameter

8.6

Next Earth close approach

Date

2025-03-05

Nominal distance (from Earth center)

0.02081

3112770

Maximum Brightness

19.5

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.5

mag

Diameter

22 - 50*

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

60600.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.923218

1-sigma variation

0.005247

Unit

Eccentricity (e)

Value

0.633671

1-sigma variation

0.001204

Unit

Inclination (i)

Value

1.4766

1-sigma variation

0.0019

Unit

Long. of Ascending Node (Ω)

Value

110.8980

1-sigma variation

0.0365

Unit

Arg. of Perihelion (ω)

Value

338.4876

1-sigma variation

0.0338

Unit

Mean Anomaly (M)

Value

325.16794

1-sigma variation

4.29115

Unit

Perihelion distance

Value

0.704531

1-sigma variation

Unit

Aphelion distance

Value

3.141905

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.258790

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.794034

1-sigma variation

Unit

MOID

Value

0.020565

1-sigma variation

Unit

Orbit Period

Value

974.1846

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.75285E-5	6.31791E-6	1.02248E-5	-1.90942E-4	1.76474E-4	-2.25146E-2
e	6.31791E-6	1.44999E-6	2.34664E-6	-4.38225E-5	4.05018E-5	-5.16721E-3
i	1.02248E-5	2.34664E-6	3.79993E-6	-7.07846E-5	6.54120E-5	-8.36255E-3
Ω	-1.90942E-4	-4.38225E-5	-7.07846E-5	1.33321E-3	-1.23273E-3	1.56165E-1
ω	1.76474E-4	4.05018E-5	6.54120E-5	-1.23273E-3	1.13989E-3	-1.44332E-1
M	-2.25146E-2	-5.16721E-3	-8.36255E-3	1.56165E-1	-1.44332E-1	1.84139E1

Date of computation: 2024-12-09 13:46 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

25.458

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

22 - 50*

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

2887

Unit

Source

[1]

Normalized RMS of residuals

Value

0.834544

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 09:11	> 1 mo	0.0816629	0.0256352	0.3527644
VENUS	1955-08-08 22:23	> 1 mo	0.0485573	0.0244880	0.2137582
EARTH	1960-10-08 23:43	> 1 w	0.0508486	0.0251586	0.1297796
VENUS	1963-08-07 21:06	> 1 mo	0.0466954	0.0245747	0.2769083
EARTH	1968-10-14 01:35	> 1 mo	0.0956805	0.0258290	0.4448725
10 Hygiea	1978-09-28 13:10	> 1 w	0.0157832	0.0120725	0.1324692
EARTH	2009-02-25 08:14	> 1 w	0.0905705	0.0211458	0.1936109
EARTH	2017-03-04 21:32	< 1 s	0.0210729	0.0209594	0.0000379
VENUS	2025-01-04 09:43	> 1 w	0.0372944	0.0052403	0.1967968
EARTH	2025-03-05 13:31	> 1 w	0.0208076	0.0206387	0.0257079
VENUS	2033-01-02 04:25	> 1 mo	0.0497202	0.0047104	1.2860275
EARTH	2033-03-03 14:50	> 1 mo	0.0321217	0.0207505	0.9691582
MARS	2051-12-06 13:00	> 1 mo	0.0202639	0.0202552	0.0287651
EARTH	2064-10-20 05:43	> 1 mo	0.1307007	0.0260503	4.5844483
EARTH	2072-10-02 14:47	> 1 mo	0.0661123	0.0254001	5.6764327
VENUS	2083-07-01 09:36	> 1 mo	0.0168156	0.0007685	0.0435991
EARTH	2110-03-18 05:50	> 1 mo	0.1762351	0.0222124	3.8633887
EARTH	2118-03-06 15:50	> 1 mo	0.0251759	0.0214859	1.3115368

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
40.07253549	61.83771890	0.02061125	MINIMUM
319.34930378	272.42687066	0.02549429	MINIMUM
359.56652986	346.91610806	0.27847901	SADDLE
359.60440069	167.00431490	1.72093746	SADDLE
179.90855866	167.41110416	2.12574599	SADDLE
179.92263551	347.42006071	4.12496574	MAXIMUM

Download:

MOID Plots

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