Asteroids

285263 1998QE2 help

Last update: 2025-10-29 13:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.034

Aphelion (Q)

3.807

Eccentricity (e)

0.573

Inclination (i)

12.9

deg

Orbit period (P)

1375.6

Earth MOID

0.02897

U parameter

0.0

Next Earth close approach

Date

2119-05-16

Nominal distance (from Earth center)

0.08758

13101709

Maximum Brightness

14.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.3

mag

Diameter

4110

Taxonomic type

Rotation period (T)

4.75

Discovery Information

Discovery Date

1998-08-19

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.420693

1-sigma variation

1.383E-8

Unit

Eccentricity (e)

Value

0.572715

1-sigma variation

4.690E-9

Unit

Inclination (i)

Value

12.8778

1-sigma variation

1.678E-6

Unit

Long. of Ascending Node (Ω)

Value

250.0709

1-sigma variation

2.211E-6

Unit

Arg. of Perihelion (ω)

Value

345.6693

1-sigma variation

5.265E-6

Unit

Mean Anomaly (M)

Value

113.98169

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.034325

1-sigma variation

Unit

Aphelion distance

Value

3.807060

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.030630

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.668380

1-sigma variation

Unit

MOID

Value

0.028969

1-sigma variation

Unit

Orbit Period

Value

1375.6499

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.91145E-16	1.65851E-17	6.46490E-15	-2.02661E-15	2.59274E-14	-1.44225E-13
e	1.65851E-17	2.19918E-17	-6.10595E-15	-3.17616E-15	-1.32164E-14	-1.01869E-14
i	6.46490E-15	-6.10595E-15	2.81480E-12	7.44813E-13	6.12900E-12	-5.67931E-12
Ω	-2.02661E-15	-3.17616E-15	7.44813E-13	4.89060E-12	-5.22957E-12	1.74332E-12
ω	2.59274E-14	-1.32164E-14	6.12900E-12	-5.22957E-12	2.77233E-11	-2.22673E-11
M	-1.44225E-13	-1.01869E-14	-5.67931E-12	1.74332E-12	-2.22673E-11	1.09161E-10

Date of computation: 2025-10-29 13:00 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

4.75

Unit

Source

[3]

Quality

Value

3,B,R

Unit

Source

[3]

Amplitude

Value

0.2

Unit

mag

Source

[3]

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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.98

17.27

Unit

mag

Source

[1]

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.014

0.06

Unit

Source

[5]

[8]

Diameter

Value

4110

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.733

0.323

0.38

Unit

B-V

V-R

R-I

Source

[9]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[10]

[11]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[12]

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Sources

No.	Name	Additional
[1]	EARN	1.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5121"> ATel#5121 (BVRI photometry of the Potentially Hazardous Asteroid 285263 (1998 QE2))
[2]	EARN	1.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5121"> ATel#5121 (BVRI photometry of the Potentially Hazardous Asteroid 285263 (1998 QE2)) 2.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5132"> ATel#5132 (Palomar Spectroscopy of Near-Earth Asteroids 137199 (1999 KX4), 152756 (1999 JV3), 163249 (2002 GT), 163364 (2002 OD20), and 285263 (1998 QE2))
[3]	EARN	1.) Springmann, A. et al. (2014) LPSC 45, 1313. (RADAR DERIVED SHAPE MODEL OF BINARY NEAR-EARTH ASTEROID (285263) 1998 QE2) 2.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5121"> ATel#5121 (BVRI photometry of the Potentially Hazardous Asteroid 285263 (1998 QE2)) 3.) Hills, K. (2013) priv.comm. href="https://dl.dropboxusercontent.com/u/53940961/285263_1998_QE2.PNG"> Phased plot of 285263 1998 QE2 4.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 5.) Hills, K. (2014) MPB 41,2-3. (ASTEROID LIGHTCURVE ANALYSIS AT RIVERLAND DINGO OBSERVATORY (RDO): 2013 RESULTS) (285263) 6.) Oey, J. (2014) MPB 41, 276-280. (LIGHTCURVE ANALYSIS OF ASTEROIDS FROM BLUE MOUNTAINS OBSERVATORY IN 2013) (99942, 163364,285263)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Joseph R. Masiero et al 2020 Planet. Sci. J. 1 5
[6]	EARN	1.) Trilling, D.E. et al. (2010) Astron. J. 140, 770-784. (EXPLORENEOs. I. DESCRIPTION AND FIRST RESULTS FROM THE WARM SPITZER NEAR-EARTH OBJECT SURVEY) (diameters & albedos for 101 NEOs)
[7]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[8]	EARN	1.) Trilling, D.E. et al. (2010) Astron. J. 140, 770-784. (EXPLORENEOs. I. DESCRIPTION AND FIRST RESULTS FROM THE WARM SPITZER NEAR-EARTH OBJECT SURVEY) (diameters & albedos for 101 NEOs) 2.) Springmann, A. et al. (2014) LPSC 45, 1313. (RADAR DERIVED SHAPE MODEL OF BINARY NEAR-EARTH ASTEROID (285263) 1998 QE2)
[9]	EARN	1.) Lin, C-H. et al. (2018) P&SS 152, 116-135. (Photometric survey and taxonomic identifications of 92 near-Earth asteroids)
[10]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Springmann, A. et al. (2013) DPS 45, 101-04. (abstract) (Binary Near-Earth Asteroid (285263) 1998 QE2: Goldstone and Arecibo Radar Imaging and Lightcurve Observations) 3.) Springmann, A. et al. (2014) LPSC 45, 1313. (RADAR DERIVED SHAPE MODEL OF BINARY NEAR-EARTH ASTEROID (285263) 1998 QE2)
[11]	EARN	1.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5132"> ATel#5132 (Palomar Spectroscopy of Near-Earth Asteroids 137199 (1999 KX4), 152756 (1999 JV3), 163249 (2002 GT), 163364 (2002 OD20), and 285263 (1998 QE2))
[12]	EARN	Earth Asteroids Research Node: https://earn.dlr.de

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9931

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.371744

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-08-19.38963

Unit

Source

[2]

Last Observation

Value

2025-10-27.236263

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1921 (4)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2013-06-07

Unit

Source

[3]

Last Observation

Value

2013-06-27

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

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 285263 1998QE2 from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1975-06-08 01:23	< 1 min	0.0884330	0.0884271	0.0000020
EARTH	2013-05-31 20:58	< 1 s	0.0391738	0.0391738	0.0000000
EARTH	2119-05-16 17:15	< 1 min	0.0875795	0.0875724	0.0000024

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
6.37142301	146.14521247	0.02896946	MINIMUM
0.48681091	315.02788590	2.02216405	SADDLE
179.91010976	314.92192625	2.82053086	SADDLE
180.46252373	135.20705567	4.81888019	MAXIMUM

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MOID Plots

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