Asteroids

2018WR1 help

Last update: 2024-04-18 19:35 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.797

Aphelion (Q)

3.706

Eccentricity (e)

0.646

Inclination (i)

15.2

deg

Orbit period (P)

1234.0

Earth MOID

0.02329

U parameter

4.0

Next Earth close approach

Date

2080-01-21

Nominal distance (from Earth center)

0.18692

27962862

Maximum Brightness

20.2

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

20.2

mag

Diameter

310

Taxonomic type

Rotation period (T)

66.70

Discovery Information

Discovery Date

2018-11-27

Observatory

Mt. Lemmon Survey

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.251577

1-sigma variation

0.000010

Unit

Eccentricity (e)

Value

0.646046

1-sigma variation

0.000002

Unit

Inclination (i)

Value

15.1725

1-sigma variation

4.563E-5

Unit

Long. of Ascending Node (Ω)

Value

274.5906

1-sigma variation

2.840E-5

Unit

Arg. of Perihelion (ω)

Value

244.8674

1-sigma variation

4.322E-5

Unit

Mean Anomaly (M)

Value

185.13367

1-sigma variation

0.00357

Unit

Perihelion distance

Value

0.796955

1-sigma variation

Unit

Aphelion distance

Value

3.706199

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.791753

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.046463

1-sigma variation

Unit

MOID

Value

0.023292

1-sigma variation

Unit

Orbit Period

Value

1234.0386

1-sigma variation

Unit

U parameter

Value

4.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.54952E-11	1.78224E-11	4.27376E-10	-2.55600E-10	3.85313E-10	-3.48616E-8
e	1.78224E-11	3.32733E-12	7.98788E-11	-4.77766E-11	7.23077E-11	-6.50629E-9
i	4.27376E-10	7.98788E-11	2.08171E-9	-1.24567E-9	1.88010E-9	-1.56036E-7
Ω	-2.55600E-10	-4.77766E-11	-1.24567E-9	8.06772E-10	-1.18947E-9	9.33243E-8
ω	3.85313E-10	7.23077E-11	1.88010E-9	-1.18947E-9	1.86757E-9	-1.40697E-7
M	-3.48616E-8	-6.50629E-9	-1.56036E-7	9.33243E-8	-1.40697E-7	1.27266E-5

Date of computation: 2024-02-21 14:29 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

66.70

Unit

Source

[1]

Quality

Value

Unit

Source

[-]

Amplitude

Value

0.69

Unit

mag

Source

[1]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[1]

Spinvector B

Value

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

Taxonomy (all)

Value

Unit

Source

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.244

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.142

Unit

Source

[5]

Diameter

Value

310

Unit

Source

[5]

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]	EARN	1.) Near-Earth Asteroid Lightcurve Analysis at the Center for Solar System Studies: 2019 January-April, B.D. Warner
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	ESA ODIM	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

185

Unit

Source

[1]

Unobserved

Value

1784

Unit

Source

[1]

Normalized RMS of residuals

Value

0.474216

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2018-11-27.32523

Unit

Source

[2]

Last Observation

Value

2019-05-31.536139

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

183 (2)

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2018WR1 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1964-12-31 15:44	> 1 d	0.0206401	0.0153375	0.0234406
EARTH	1991-12-31 03:56	116.0	0.0193716	0.0192162	0.0001403
EARTH	2019-01-11 03:14	< 1 s	0.1218012	0.1218000	0.0000004
EARTH	2080-01-21 01:57	446.8	0.1869202	0.1815445	0.0017919

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