Asteroids

2018YO2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.965

Aphelion (Q)

1.501

Eccentricity (e)

0.217

Inclination (i)

1.0

deg

Orbit period (P)

500.1

Earth MOID

0.00042

U parameter

5.9

Next Earth close approach

Date

2029-10-04

Nominal distance (from Earth center)

0.18261

27317536

Maximum Brightness

28.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

29.8

mag

Diameter

3 - 7*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-12-29

Observatory

Palomar Mountain--ZTF

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

1.233015

1-sigma variation

0.000038

Unit

Eccentricity (e)

Value

0.217020

1-sigma variation

0.000026

Unit

Inclination (i)

Value

0.9960

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

94.0563

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

334.9279

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

31.23012

1-sigma variation

0.08513

Unit

Perihelion distance

Value

0.965425

1-sigma variation

Unit

Aphelion distance

Value

1.500604

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.001994

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.444918

1-sigma variation

Unit

MOID

Value

0.000422

1-sigma variation

Unit

Orbit Period

Value

500.0932

1-sigma variation

Unit

U parameter

Value

5.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.44882E-9	1.00474E-9	4.41995E-9	2.86020E-9	-1.80213E-8	-3.24032E-6
e	1.00474E-9	6.96771E-10	3.06521E-9	1.98413E-9	-1.24988E-8	-2.24711E-6
i	4.41995E-9	3.06521E-9	1.34887E-8	8.77145E-9	-5.50440E-8	-9.88530E-6
Ω	2.86020E-9	1.98413E-9	8.77145E-9	6.25997E-9	-3.64771E-8	-6.39673E-6
ω	-1.80213E-8	-1.24988E-8	-5.50440E-8	-3.64771E-8	2.25738E-7	4.03046E-5
M	-3.24032E-6	-2.24711E-6	-9.88530E-6	-6.39673E-6	4.03046E-5	7.24703E-3

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

29.773

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

3 - 7*

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

2433

Unit

Source

[1]

Normalized RMS of residuals

Value

0.793459

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-12-29.446667

Unit

Source

[2]

Last Observation

Value

2019-01-17.449297

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (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 2018YO2 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	1951-09-14 12:11	469.9	0.1465694	0.1302301	0.0054606
EARTH	1978-01-07 06:22	930.6	0.0607775	0.0420468	0.0062440
EARTH	1982-11-13 17:26	> 1 d	0.0428837	0.0421405	0.0002681
EARTH	1987-09-20 03:12	1199.0	0.0806612	0.0537307	0.0093515
EARTH	2018-08-23 16:02	152.2	0.1718210	0.1717819	0.0000130
EARTH	2018-12-28 06:26	< 1 s	0.0013116	0.0013111	0.0000002
EARTH	2029-10-04 13:57	218.8	0.1826064	0.1730558	0.0031843
EARTH	2045-01-04 11:54	> 1 d	0.0256668	0.0105942	0.0050303
MARS	2048-08-04 23:12	> 1 d	0.0330343	0.0330342	0.0000274
EARTH	2056-01-18 22:03	> 1 d	0.1421889	0.0038264	0.0914379
EARTH	2084-10-12 18:58	> 1 w	0.0965598	0.0157755	0.1210334
EARTH	2095-10-20 12:56	> 1 w	0.0445030	0.0148903	0.0514831
MARS	2104-12-08 00:44	> 1 w	0.0390947	0.0339744	0.0025191
EARTH	2122-01-21 10:29	> 1 w	0.1517916	0.0052155	0.1801609

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
21.24568711	353.17605128	0.00045934	MINIMUM
334.87837971	296.54147020	0.01440138	MINIMUM
355.73652199	322.02485057	0.02255449	SADDLE
178.30592942	145.02864397	0.48718121	SADDLE
357.39063787	144.07350053	1.97884730	SADDLE
178.42961899	325.13839978	2.48693578	MAXIMUM

Download:

MOID Plots

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