Asteroids

2018XP3 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.876

Aphelion (Q)

1.314

Eccentricity (e)

0.200

Inclination (i)

17.0

deg

Orbit period (P)

418.6

Earth MOID

0.03669

U parameter

1.2

Next Earth close approach

Date

2026-11-26

Nominal distance (from Earth center)

0.16143

24149957

Maximum Brightness

20.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

22.8

mag

Diameter

70 - 160*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-12-09

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

1.095144

1-sigma variation

2.229E-8

Unit

Eccentricity (e)

Value

0.200238

1-sigma variation

3.527E-7

Unit

Inclination (i)

Value

16.9907

1-sigma variation

1.982E-5

Unit

Long. of Ascending Node (Ω)

Value

72.5539

1-sigma variation

1.516E-5

Unit

Arg. of Perihelion (ω)

Value

245.7290

1-sigma variation

4.131E-5

Unit

Mean Anomaly (M)

Value

300.29859

1-sigma variation

0.00014

Unit

Perihelion distance

Value

0.875855

1-sigma variation

Unit

Aphelion distance

Value

1.314434

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.159535

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.042934

1-sigma variation

Unit

MOID

Value

0.036685

1-sigma variation

Unit

Orbit Period

Value

418.6059

1-sigma variation

Unit

U parameter

Value

1.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.96847E-16	7.58214E-15	-1.07774E-13	-1.03003E-13	5.07722E-13	-2.98390E-12
e	7.58214E-15	1.24427E-13	-5.25545E-13	-1.01324E-12	5.93276E-12	-4.45526E-11
i	-1.07774E-13	-5.25545E-13	3.93006E-10	1.03628E-10	-3.34481E-10	7.47683E-10
Ω	-1.03003E-13	-1.01324E-12	1.03628E-10	2.29747E-10	-4.06197E-10	7.10862E-10
ω	5.07722E-13	5.93276E-12	-3.34481E-10	-4.06197E-10	1.70612E-9	-4.04863E-9
M	-2.98390E-12	-4.45526E-11	7.47683E-10	7.10862E-10	-4.04863E-9	1.90202E-8

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

22.825

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

70 - 160*

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

3169

Unit

Source

[1]

Unobserved

Value

2706

Unit

Source

[1]

Normalized RMS of residuals

Value

0.820797

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2010-05-02.244143

Unit

Source

[2]

Last Observation

Value

2019-01-04.200382

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

55 (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 2018XP3 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	1955-05-31 02:59	1.7	0.0378723	0.0378679	0.0000015
EARTH	1963-06-13 19:10	2.2	0.1420109	0.1419744	0.0000122
EARTH	1979-11-22 03:17	< 1 min	0.1315024	0.1314954	0.0000023
EARTH	1987-11-18 21:58	< 1 min	0.1615420	0.1615276	0.0000048
EARTH	1994-05-19 17:52	< 1 min	0.1648508	0.1648373	0.0000045
EARTH	2002-05-29 09:02	< 1 min	0.0402477	0.0402453	0.0000008
EARTH	2010-06-08 11:04	< 1 min	0.1026598	0.1026590	0.0000003
EARTH	2026-11-26 01:42	< 1 min	0.1614325	0.1614298	0.0000009
EARTH	2034-11-20 03:01	< 1 min	0.1265259	0.1265252	0.0000002
EARTH	2042-11-18 22:10	< 1 min	0.1918542	0.1918442	0.0000033
EARTH	2049-05-21 15:35	< 1 min	0.1331934	0.1331730	0.0000068
EARTH	2057-05-30 05:21	< 1 min	0.0361493	0.0361476	0.0000006
EARTH	2065-06-09 10:05	3.0	0.1121965	0.1121402	0.0000188
EARTH	2081-11-25 16:30	4.2	0.1582964	0.1582391	0.0000191
EARTH	2089-11-20 01:49	1.8	0.1259220	0.1259067	0.0000051
EARTH	2097-11-18 21:18	< 1 min	0.1882548	0.1881322	0.0000409
EARTH	2104-05-22 03:38	5.0	0.1401150	0.1399322	0.0000609
EARTH	2112-05-30 07:25	6.3	0.0377481	0.0376840	0.0000215
EARTH	2120-06-06 23:34	17.0	0.0835693	0.0832360	0.0001112

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
300.77661342	146.91681871	0.03810660	MINIMUM
87.46350795	317.29357374	0.12561084	MINIMUM
15.96370937	237.25811417	0.30543104	SADDLE
193.41491694	46.80172153	0.45701823	SADDLE
1.27677245	38.34608731	1.84588600	SADDLE
173.35748428	210.05302326	2.30979386	MAXIMUM

Download:

MOID Plots

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