Asteroids

2017UO help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.265

Aphelion (Q)

4.828

Eccentricity (e)

0.896

Inclination (i)

8.6

deg

Orbit period (P)

1484.1

Earth MOID

0.07663

U parameter

0.2

Next Earth close approach

Date

2081-10-25

Nominal distance (from Earth center)

0.05068

7581024

Maximum Brightness

15.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.3

mag

Diameter

240 - 500*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-10-16

Observatory

ATLAS-MLO, Mauna Loa

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

2.546340

1-sigma variation

2.882E-8

Unit

Eccentricity (e)

Value

0.895909

1-sigma variation

2.022E-7

Unit

Inclination (i)

Value

8.5653

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

236.8478

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

25.3203

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

5.96812

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.265052

1-sigma variation

Unit

Aphelion distance

Value

4.827627

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.735425

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.656025

1-sigma variation

Unit

MOID

Value

0.076632

1-sigma variation

Unit

Orbit Period

Value

1484.1333

1-sigma variation

Unit

U parameter

Value

0.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.30671E-16	-1.23477E-15	2.25657E-13	-4.48786E-13	7.50248E-13	-2.55962E-13
e	-1.23477E-15	4.08905E-14	4.79207E-12	-8.66280E-12	-2.09240E-12	-1.96059E-12
i	2.25657E-13	4.79207E-12	2.62173E-9	-6.23003E-9	4.85681E-9	-2.65025E-10
Ω	-4.48786E-13	-8.66280E-12	-6.23003E-9	1.63187E-8	-1.37809E-8	4.58811E-10
ω	7.50248E-13	-2.09240E-12	4.85681E-9	-1.37809E-8	1.40985E-8	5.67700E-11
M	-2.55962E-13	-1.96059E-12	-2.65025E-10	4.58811E-10	5.67700E-11	2.32150E-10

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

20.251

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

240 - 500*

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

2956

Unit

Source

[1]

Unobserved

Value

1422

Unit

Source

[1]

Normalized RMS of residuals

Value

0.497029

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2013-10-25.559782

Unit

Source

[2]

Last Observation

Value

2021-11-28.091081

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

157 (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

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 2017UO 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	1956-10-16 14:34	< 1 min	0.1140623	0.1140335	0.0000096
EARTH	1960-10-21 09:11	< 1 min	0.0854135	0.0854037	0.0000033
EARTH	1964-10-25 21:54	< 1 min	0.1522786	0.1522514	0.0000090
EARTH	2017-10-12 18:13	< 1 s	0.1611873	0.1611862	0.0000004
EARTH	2081-10-25 04:14	< 1 min	0.0506760	0.0506460	0.0000100
EARTH	2097-02-05 11:18	1.6	0.1572806	0.1572355	0.0000150
EARTH	2108-11-02 09:33	2.2	0.0759394	0.0758435	0.0000320

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
47.29073228	284.79916165	0.07676475	MINIMUM
313.44229015	36.41270114	0.14568380	MINIMUM
0.90077289	162.40699361	0.75105861	SADDLE
0.74566545	341.74436586	1.24925297	SADDLE
180.09479520	339.76288193	3.84771643	SADDLE
179.99116176	159.74090343	5.84343695	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out