Asteroids

2017UC help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.026

Aphelion (Q)

2.406

Eccentricity (e)

0.402

Inclination (i)

0.8

deg

Orbit period (P)

821.0

Earth MOID

0.02583

U parameter

7.9

Next Earth close approach

Date

2026-09-27

Nominal distance (from Earth center)

0.02942

4401565

Maximum Brightness

19.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.4

mag

Diameter

14 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-10-16

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

1.715986

1-sigma variation

0.001562

Unit

Eccentricity (e)

Value

0.401876

1-sigma variation

0.000528

Unit

Inclination (i)

Value

0.8282

1-sigma variation

0.0008

Unit

Long. of Ascending Node (Ω)

Value

10.8804

1-sigma variation

0.0020

Unit

Arg. of Perihelion (ω)

Value

2.9413

1-sigma variation

0.0031

Unit

Mean Anomaly (M)

Value

307.92727

1-sigma variation

1.89601

Unit

Perihelion distance

Value

1.026373

1-sigma variation

Unit

Aphelion distance

Value

2.405599

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.025836

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.404373

1-sigma variation

Unit

MOID

Value

0.025828

1-sigma variation

Unit

Orbit Period

Value

821.0489

1-sigma variation

Unit

U parameter

Value

7.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.43934E-6	8.25177E-7	1.32182E-6	-3.12164E-6	-4.77267E-6	-2.96126E-3
e	8.25177E-7	2.79140E-7	4.47144E-7	-1.05597E-6	-1.61452E-6	-1.00173E-3
i	1.32182E-6	4.47144E-7	7.16343E-7	-1.68982E-6	-2.58857E-6	-1.60464E-3
Ω	-3.12164E-6	-1.05597E-6	-1.68982E-6	4.03577E-6	6.05258E-6	3.78955E-3
ω	-4.77267E-6	-1.61452E-6	-2.58857E-6	6.05258E-6	9.43020E-6	5.79382E-3
M	-2.96126E-3	-1.00173E-3	-1.60464E-3	3.78955E-3	5.79382E-3	3.59485E0

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

26.445

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

14 - 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

3217

Unit

Source

[1]

Normalized RMS of residuals

Value

0.679826

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-10-16.2066

Unit

Source

[2]

Last Observation

Value

2017-10-31.45657

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

54 (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 2017UC 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	1952-10-05 19:55	> 1 mo	0.0264697	0.0158364	0.0228422
EARTH	1961-09-18 17:34	> 1 mo	0.0395018	0.0019835	0.1352895
EARTH	2017-10-15 09:37	< 1 min	0.0340049	0.0338843	0.0000402
EARTH	2026-09-27 00:58	> 1 w	0.0294226	0.0077939	0.0214796
EARTH	2035-08-28 22:24	> 1 mo	0.1657631	0.0046883	0.4116683
EARTH	2082-11-07 19:56	> 1 mo	0.1441282	0.0043456	1.0466732
EARTH	2091-10-08 05:44	> 1 mo	0.0267921	0.0171309	0.0751531
EARTH	2100-09-11 00:42	> 1 mo	0.0741634	0.0012349	3.4134338

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
357.88307306	267.10596797	0.02582806	MINIMUM
179.09694815	88.42989068	1.40587462	SADDLE
357.88453260	87.10663896	2.02590531	SADDLE
179.09490174	268.42819137	3.40595089	MAXIMUM

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MOID Plots

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