Asteroids

2018DO3 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.803

Aphelion (Q)

2.313

Eccentricity (e)

0.484

Inclination (i)

4.2

deg

Orbit period (P)

710.3

Earth MOID

0.01113

U parameter

9.0

Next Earth close approach

Date

2053-02-08

Nominal distance (from Earth center)

0.01077

1611089

Maximum Brightness

21.8

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

29.5

mag

Diameter

3 - 8*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2018-02-17

Observatory

Maunakea

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

1.557917

1-sigma variation

0.742793

Unit

Eccentricity (e)

Value

0.484465

1-sigma variation

0.287209

Unit

Inclination (i)

Value

4.1712

1-sigma variation

1.4388

Unit

Long. of Ascending Node (Ω)

Value

148.2206

1-sigma variation

14.6907

Unit

Arg. of Perihelion (ω)

Value

286.4215

1-sigma variation

6.8547

Unit

Mean Anomaly (M)

Value

124.44089

1-sigma variation

917.21600

Unit

Perihelion distance

Value

0.803161

1-sigma variation

Unit

Aphelion distance

Value

2.312672

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.060660

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.369347

1-sigma variation

Unit

MOID

Value

0.011126

1-sigma variation

Unit

Orbit Period

Value

710.2557

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.51742E-1	2.13281E-1	-1.05674E0	-1.09121E1	-5.04368E0	-6.81302E2
e	2.13281E-1	8.24893E-2	-4.09909E-1	-4.21854E0	-1.95588E0	-2.63361E2
i	-1.05674E0	-4.09909E-1	2.07003E0	2.09118E1	9.86143E0	1.30480E3
Ω	-1.09121E1	-4.21854E0	2.09118E1	2.15818E2	9.98045E1	1.34745E4
ω	-5.04368E0	-1.95588E0	9.86143E0	9.98045E1	4.69873E1	6.22769E3
M	-6.81302E2	-2.63361E2	1.30480E3	1.34745E4	6.22769E3	8.41286E5

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

29.468

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

3 - 8*

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

0.2

Unit

Source

[1]

Unobserved

Value

3178

Unit

Source

[1]

Normalized RMS of residuals

Value

0.0721182

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-02-17.28367

Unit

Source

[2]

Last Observation

Value

2018-02-17.46929

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

63 (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

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 2018DO3 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	1950-02-02 00:49	> 1 mo	0.0541687	0.0073660	3388.2976720
EARTH	1951-11-22 13:55	> 1 mo	0.1882739	0.0667654	617.3386644
EARTH	1953-09-24 15:57	> 1 mo	0.0709967	0.0285707	3197.7821113
EARTH	1985-02-07 13:33	> 1 mo	0.0127458	0.0081156	19.2218006
EARTH	1986-11-28 09:04	> 1 mo	0.1915914	0.1259815	5.2285838
EARTH	1988-09-25 00:22	> 1 mo	0.0682661	0.0300346	54.2591008
EARTH	2018-02-08 20:04	> 1 d	0.0121827	0.0033171	0.0029724
EARTH	2019-12-05 08:02	> 1 mo	0.1929044	0.1677664	0.0294845
EARTH	2021-09-29 00:19	> 1 mo	0.0476148	0.0314977	2.8695909
MARS	2046-11-21 04:47	> 1 mo	0.0440796	0.0337465	21.8462644
EARTH	2053-02-08 11:45	> 1 mo	0.0107695	0.0063232	13.7575007
EARTH	2054-12-01 18:21	> 1 mo	0.1930697	0.1639296	28.0271550
EARTH	2056-09-27 02:02	> 1 mo	0.0606395	0.0331733	1316.2451964
EARTH	2086-02-18 17:50	> 1 mo	0.1331046	0.0045035	25731.9407484
EARTH	2087-12-29 07:16	> 1 mo	0.1732594	0.0170487	9154.8177854
EARTH	2089-10-09 19:40	> 1 mo	0.0900848	0.0309410	19782.3703150
EARTH	2121-02-13 04:00	> 1 mo	0.0353300	0.0049407	6190.4203998
EARTH	2122-12-15 06:36	> 1 mo	0.1891162	0.1301812	91.7142981
EARTH	2124-10-05 15:39	> 1 mo	0.0607757	0.0312349	1945.2379884

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
41.03468201	34.54933045	0.01112561	MINIMUM
316.75524729	263.25529436	0.04594207	MINIMUM
358.16881404	327.79422728	0.19309748	SADDLE
179.50669194	149.77911352	1.30248515	SADDLE
358.79714403	148.86153019	1.81657495	SADDLE
179.67466486	329.88497670	3.29668300	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2018DO3

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2040-02-15.044	66199.044	1.215	0.000	1.10 ± 39.820	8.80E6	1.25E-9	6.14E-1	-8.73	0
2087-02-11.758	83362.758	0.846	0.000	0.23 ± 12.765	8.32E6	3.72E-9	4.62E-2	-9.77	0


Based on 63 optical observations (of which 0 are rejected as outliers) from 2018/02/17.284 to 2018/02/17.469.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.18 and 1.18 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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