Asteroids

2017UO51 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.103

Aphelion (Q)

4.880

Eccentricity (e)

0.631

Inclination (i)

14.1

deg

Orbit period (P)

1889.7

Earth MOID

0.14947

U parameter

0.5

Next Earth close approach

Date

2079-07-10

Nominal distance (from Earth center)

0.15988

23918269

Maximum Brightness

18.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.1

mag

Diameter

260 - 600*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-10-28

Observatory

Pan-STARRS 1, Haleakala

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

2.991349

1-sigma variation

1.077E-7

Unit

Eccentricity (e)

Value

0.631211

1-sigma variation

6.202E-8

Unit

Inclination (i)

Value

14.0628

1-sigma variation

1.500E-5

Unit

Long. of Ascending Node (Ω)

Value

81.9927

1-sigma variation

4.135E-5

Unit

Arg. of Perihelion (ω)

Value

222.4731

1-sigma variation

4.085E-5

Unit

Mean Anomaly (M)

Value

265.20369

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.103177

1-sigma variation

Unit

Aphelion distance

Value

4.879521

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.381862

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.212392

1-sigma variation

Unit

MOID

Value

0.149474

1-sigma variation

Unit

Orbit Period

Value

1889.7271

1-sigma variation

Unit

U parameter

Value

0.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.15984E-14	-6.14922E-15	9.90075E-13	-1.84165E-12	-9.82613E-13	-1.24041E-12
e	-6.14922E-15	3.84638E-15	-5.63884E-13	1.08390E-12	3.16263E-13	7.08750E-13
i	9.90075E-13	-5.63884E-13	2.25107E-10	-5.30535E-10	2.95264E-10	-1.12942E-10
Ω	-1.84165E-12	1.08390E-12	-5.30535E-10	1.70983E-9	-1.25681E-9	2.12797E-10
ω	-9.82613E-13	3.16263E-13	2.95264E-10	-1.25681E-9	1.66910E-9	2.73092E-11
M	-1.24041E-12	7.08750E-13	-1.12942E-10	2.12797E-10	2.73092E-11	1.58087E-10

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

20.073

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

260 - 600*

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

1836

Unit

Source

[1]

Unobserved

Value

1341

Unit

Source

[1]

Normalized RMS of residuals

Value

0.558258

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-09-19.596824

Unit

Source

[2]

Last Observation

Value

2022-09-30.068387

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

127 (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 2017UO51 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
4 Vesta	2049-01-22 23:13	< 1 min	0.0036257	0.0036220	0.0000013
EARTH	2079-07-10 00:03	< 1 min	0.1598838	0.1598769	0.0000023

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
349.11529288	179.94341054	0.15065617	MINIMUM
0.56404368	23.79792664	2.08372259	SADDLE
180.43905473	22.38631663	3.91155625	SADDLE
179.54261407	201.95989276	5.88518664	MAXIMUM

Download:

MOID Plots

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