Asteroids

66063 1998RO1 help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.277

Aphelion (Q)

1.704

Eccentricity (e)

0.720

Inclination (i)

22.7

deg

Orbit period (P)

360.3

Earth MOID

0.09221

U parameter

0.3

Next Earth close approach

Date

2074-09-29

Nominal distance (from Earth center)

0.15309

22901507

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.1

mag

Diameter

620

Taxonomic type

Rotation period (T)

2.493

Discovery Information

Discovery Date

1998-09-14

Observatory

Lincoln Laboratory ETS, New Mexico

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

0.990935

1-sigma variation

2.346E-9

Unit

Eccentricity (e)

Value

0.720061

1-sigma variation

6.841E-8

Unit

Inclination (i)

Value

22.6921

1-sigma variation

8.492E-6

Unit

Long. of Ascending Node (Ω)

Value

351.8333

1-sigma variation

5.644E-6

Unit

Arg. of Perihelion (ω)

Value

151.1718

1-sigma variation

7.798E-6

Unit

Mean Anomaly (M)

Value

306.14179

1-sigma variation

0.00003

Unit

Perihelion distance

Value

0.277401

1-sigma variation

Unit

Aphelion distance

Value

1.704470

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.286224

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.700964

1-sigma variation

Unit

MOID

Value

0.092215

1-sigma variation

Unit

Orbit Period

Value

360.3018

1-sigma variation

Unit

U parameter

Value

0.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.50306E-18	6.04228E-17	9.40605E-16	-5.97984E-16	5.10304E-15	-6.70300E-14
e	6.04228E-17	4.67964E-15	-2.07237E-13	-1.28761E-13	4.56302E-13	-4.77308E-13
i	9.40605E-16	-2.07237E-13	7.21161E-11	4.73605E-11	-5.00233E-11	-3.67485E-11
Ω	-5.97984E-16	-1.28761E-13	4.73605E-11	3.18575E-11	-3.33923E-11	-7.97045E-12
ω	5.10304E-15	4.56302E-13	-5.00233E-11	-3.33923E-11	6.08057E-11	-3.15658E-11
M	-6.70300E-14	-4.77308E-13	-3.67485E-11	-7.97045E-12	-3.15658E-11	8.35470E-10

Date of computation: 2026-07-30 09:40 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

2.493

Unit

Source

[5]

Quality

Value

3,B,R

Unit

Source

[5]

Amplitude

Value

0.16

Unit

mag

Source

[5]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

277

Unit

Source

[1]

Spinvector B

Value

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

S/Sr

Unit

Source

[2]

[3]

Taxonomy (all)

Value

S/Sr

Unit

Source

[2]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.068

18.05

Unit

mag

Source

[6]

[7]

Slope Parameter (G)

Value

0.12

0.15**

Unit

Source

[7]

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.3

Unit

Source

[8]

Diameter

Value

620

Unit

Source

[8]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[9]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[4]

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Sources

No.	Name	Additional
[1]	EARN	1.) Scheirich P. & P. Pravec (2009) Icarus 200, 531-547. (Modeling of lightcurves of binary asteroids) (175706,65803, 66391,185851,66063)
[2]	EARN	1.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[3]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Pravec, P. et al. (2006) Icarus 181, 63-93. (Photometric survey of binary near-Earth asteroids) 2.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods" 3.) Pravec, P. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08216.html"> 8216. (66063 1998 RO1) (photometry lightcurve orbital and rotation period; radar obs - binary) 4.) Galad, A. et al. (2004) C.A.O.S.P. 34, 157-166. (Relative photometry of numbered asteroids (3712), (4197), (5587), (28753) and (66063)) 5.) Abell, P.A. et al. (2005) LPSC 36-2283. (Compositional Investigation of Binary Near-Earth Asteroid 66063 (1998 RO1): A Potentially Undifferentiated Assemblage) 6.) Pravec, P. et al (2016) Icarus 267,267-295. (Binary asteroid population. 3. Secondary rotations and elongations) (..,..)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)
[8]	EARN	1.) Wolters, S.D. et al. (2008) Icarus 193, 535-552. (Thermal infrared and optical observations of four near-Earth asteroid) (433,66063,137032,138258)
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Pravec, P. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08216.html"> 8216. (66063 1998 RO1) (photometry lightcurve orbital and rotation period; radar obs - binary)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9064

Unit

Source

[1]

Unobserved

Value

1865

Unit

Source

[1]

Normalized RMS of residuals

Value

0.486427

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1996-09-12.35488

Unit

Source

[2]

Last Observation

Value

2021-07-07.47203

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1377 (29)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2003-09-29

Unit

Source

[3]

Last Observation

Value

2004-10-05

Unit

Source

[3]

Delay (Discarded)

Value

4 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

4 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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Final Date: *

Normalised Only accepted

Max residual (arcsec):

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Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

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* - 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 66063 1998RO1 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
MARS	1964-03-19 09:52	< 1 s	0.0089849	0.0089832	0.0000006
EARTH	2002-09-29 17:37	< 1 s	0.1838228	0.1838228	0.0000000
EARTH	2003-09-29 05:25	< 1 s	0.1252007	0.1252007	0.0000000
EARTH	2004-09-26 21:17	< 1 s	0.0921273	0.0921273	0.0000000
EARTH	2005-09-24 22:17	< 1 s	0.1124589	0.1124588	0.0000000
EARTH	2006-09-22 12:56	< 1 s	0.1684407	0.1684405	0.0000000
MARS	2045-02-02 04:12	< 1 s	0.0436202	0.0436184	0.0000006
MARS	2065-10-12 11:29	< 1 s	0.0054381	0.0054354	0.0000009
EARTH	2074-09-29 20:56	< 1 min	0.1530871	0.1530838	0.0000011
EARTH	2075-09-28 23:06	< 1 min	0.1057922	0.1057898	0.0000008
EARTH	2076-09-26 08:33	< 1 min	0.0975119	0.0975103	0.0000005
EARTH	2077-09-24 06:07	< 1 min	0.1366093	0.1366042	0.0000017
EARTH	2078-09-21 19:06	< 1 min	0.1969567	0.1969497	0.0000023
MARS	2125-12-20 17:26	< 1 min	0.0144257	0.0143868	0.0000130

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
266.77128033	260.29211177	0.09221454	MINIMUM
89.86404653	175.83393872	0.37747026	MINIMUM
355.48463513	28.05535282	0.71801594	SADDLE
175.02355794	218.94488071	0.73644119	SADDLE
358.93921757	215.89581260	1.28650704	SADDLE
181.62023325	41.50147056	2.68130106	MAXIMUM

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MOID Plots

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