Asteroids

52768 1998OR2 help

Last update: 2026-09-17 13:16 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

1.009

Aphelion (Q)

3.750

Eccentricity (e)

0.576

Inclination (i)

5.9

deg

Orbit period (P)

1340.6

Earth MOID

0.00792

U parameter

0.0

Next Earth close approach

Date

2031-05-18

Nominal distance (from Earth center)

0.12711

19015941

Maximum Brightness

13.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

15.9

mag

Diameter

2510

Taxonomic type

Rotation period (T)

4.110

Discovery Information

Discovery Date

1998-07-24

Observatory

Haleakala-NEAT/GEODSS

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

61400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.379433

1-sigma variation

3.075E-9

Unit

Eccentricity (e)

Value

0.575905

1-sigma variation

2.025E-9

Unit

Inclination (i)

Value

5.8800

1-sigma variation

1.364E-6

Unit

Long. of Ascending Node (Ω)

Value

26.9313

1-sigma variation

3.042E-6

Unit

Arg. of Perihelion (ω)

Value

174.5614

1-sigma variation

4.046E-6

Unit

Mean Anomaly (M)

Value

296.12362

1-sigma variation

1.383E-6

Unit

Perihelion distance

Value

1.009106

1-sigma variation

Unit

Aphelion distance

Value

3.749761

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.732199

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.008031

1-sigma variation

Unit

MOID

Value

0.007916

1-sigma variation

Unit

Orbit Period

Value

1340.6293

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.45383E-18	1.20003E-18	-2.35594E-17	-1.66819E-17	8.23246E-16	-4.11339E-15
e	1.20003E-18	4.09891E-18	1.44907E-16	-3.27164E-15	6.09459E-16	-1.00272E-16
i	-2.35594E-17	1.44907E-16	1.86009E-12	4.80416E-13	-1.73123E-13	-4.22386E-14
Ω	-1.66819E-17	-3.27164E-15	4.80416E-13	9.25618E-12	-1.04813E-11	2.56652E-13
ω	8.23246E-16	6.09459E-16	-1.73123E-13	-1.04813E-11	1.63680E-11	-1.35586E-12
M	-4.11339E-15	-1.00272E-16	-4.22386E-14	2.56652E-13	-1.35586E-12	1.91203E-12

Date of computation: 2026-09-17 13:16 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

4.110

4.112

3.198

Unit

Source

[1]

[6]

Quality

Value

Unit

Source

[6]

Amplitude

Value

0.16

0.16-0.29

Unit

mag

Source

[1]

[6]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

153

Unit

Source

[1]

Spinvector B

Value

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

[3]

Taxonomy (all)

Value

Xk;L

Unit

Source

[4]

[5]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.1

15.884

Unit

mag

Source

[7]

[8]

Slope Parameter (G)

Value

0.15**

Unit

Source

[8]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.164

Unit

Source

[9]

Diameter

Value

2510

Unit

Source

[9]

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.) Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS): Paper 4. Skiff, Brian A et al.
[2]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[3]	EARN	1.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Somers, J.M. et al. (2010) DPS 42, 1316. (abstract) (Optical Characterization Of Planetary Radar Targets, Low-deltaV, And Potentially Hazardous Asteroids: Results From 2009-2010) 2.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)
[6]	EARN	1.) BetzlerS, A. & A.B. Novaes (2009) MPB 36, 145-147. (PHOTOMETRIC OBSERVATIONS OF 1998 OR2, 1999 AQ10, AND 2008 TC3) 2.) Koehn, B.W. et al. (2014) MPB 41, 286-300. (LOWELL OBSERVATORY NEAR-EARTH ASTEROID PHOTOMETRIC SURVEY (NEAPS) - 2009 JANUARY THROUGH 2009 JUNE) (433,1943,3554,5011,5604, 5620,5693,8566,14402,16834,22753,35107,52768,68350,85867, 138883,141052,143651,154244,161989,162385,163758,175706, 194386,203217,207945,208023,212546,256412,2001FE90,2004LV3, 2005BC,2005SG19,2008QT3,2008WL60,2009DE47,2009DO111,2009EP2, 2009FD,2009JM2)
[7]	EARN	1.) BetzlerS, A. & A.B. Novaes (2009) MPB 36, 145-147. (PHOTOMETRIC OBSERVATIONS OF 1998 OR2, 1999 AQ10, AND 2008 TC3)
[8]	ESA Aegis	ESA orbit determination and impact monitoring system
[9]	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

14014

Unit

Source

[1]

Unobserved

Value

320

Unit

Source

[1]

Normalized RMS of residuals

Value

0.33279

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1987-06-30.76015

Unit

Source

[2]

Last Observation

Value

2025-11-11.719675

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

6089 (31)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2020-04-16

Unit

Source

[3]

Last Observation

Value

2020-04-23

Unit

Source

[3]

Delay (Discarded)

Value

8 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

8 (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

Filters

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Final Date: *

Normalised Only accepted

Max residual (arcsec):

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Computation parameters

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Final Date: *

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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 52768 1998OR2 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	2009-03-12 01:46	< 1 min	0.1794534	0.1794530	0.0000001
EARTH	2020-04-29 09:55	< 1 s	0.0420485	0.0420485	0.0000000
EARTH	2031-05-18 06:55	< 1 min	0.1271137	0.1271134	0.0000001
EARTH	2079-04-16 13:30	< 1 min	0.0118495	0.0118494	0.0000000
EARTH	2090-05-17 12:07	1.3	0.1149493	0.1149293	0.0000067

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
2.46966766	102.41881708	0.00791627	MINIMUM
1.22449481	280.02990276	2.00555307	SADDLE
180.30863011	278.96259096	2.75321593	SADDLE
180.35472945	98.98755117	4.75116069	MAXIMUM

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MOID Plots

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