Asteroids

494999 2010JU39 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.417

Aphelion (Q)

1.421

Eccentricity (e)

0.546

Inclination (i)

36.2

deg

Orbit period (P)

321.9

Earth MOID

0.00578

U parameter

0.3

Next Earth close approach

Date

2034-06-25

Nominal distance (from Earth center)

0.048

7181190

Maximum Brightness

17.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.7

mag

Diameter

300 - 700*

Taxonomic type

Rotation period (T)

30.20

Discovery Information

Discovery Date

2010-05-09

Observatory

Mt. Lemmon Survey

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

0.919139

1-sigma variation

3.679E-9

Unit

Eccentricity (e)

Value

0.546013

1-sigma variation

8.738E-8

Unit

Inclination (i)

Value

36.2158

1-sigma variation

1.007E-5

Unit

Long. of Ascending Node (Ω)

Value

95.1595

1-sigma variation

2.526E-6

Unit

Arg. of Perihelion (ω)

Value

311.3809

1-sigma variation

5.026E-6

Unit

Mean Anomaly (M)

Value

21.50939

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.417277

1-sigma variation

Unit

Aphelion distance

Value

1.421001

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.509634

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.008511

1-sigma variation

Unit

MOID

Value

0.005780

1-sigma variation

Unit

Orbit Period

Value

321.8624

1-sigma variation

Unit

U parameter

Value

0.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.35342E-17	-5.96935E-17	-1.90258E-15	1.92971E-16	-3.62503E-15	-6.12675E-14
e	-5.96935E-17	7.63565E-15	-2.25755E-14	4.00399E-14	1.85445E-13	1.00063E-12
i	-1.90258E-15	-2.25755E-14	1.01381E-10	-1.25535E-11	1.16157E-11	3.72949E-12
Ω	1.92971E-16	4.00399E-14	-1.25535E-11	6.37985E-12	-8.06912E-12	7.53075E-12
ω	-3.62503E-15	1.85445E-13	1.16157E-11	-8.06912E-12	2.52656E-11	1.80904E-11
M	-6.12675E-14	1.00063E-12	3.72949E-12	7.53075E-12	1.80904E-11	3.63252E-10

Date of computation: 2025-09-10 00:30 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

30.20

Unit

Source

[1]

Quality

Value

Unit

Source

[-]

Amplitude

Value

0.48

Unit

mag

Source

[1]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

247

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

19.693

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[5]

Diameter

Value

300 - 700*

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 March-July, 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 Aegis	ESA orbit determination and impact monitoring system
[5]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8046

Unit

Source

[1]

Unobserved

Value

143

Unit

Source

[1]

Normalized RMS of residuals

Value

0.574175

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2003-06-07.317158

Unit

Source

[2]

Last Observation

Value

2025-06-17.185158

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

191 (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

2019-06-27

Unit

Source

[3]

Last Observation

Value

2019-06-28

Unit

Source

[3]

Delay (Discarded)

Value

2 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

3 (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 494999 2010JU39 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	1960-06-24 03:28	< 1 s	0.0630569	0.0630566	0.0000001
EARTH	1967-06-30 12:31	< 1 s	0.1890071	0.1890061	0.0000003
EARTH	1982-06-27 20:56	< 1 min	0.0441811	0.0441784	0.0000009
EARTH	1997-06-24 07:32	< 1 min	0.0698505	0.0698483	0.0000007
EARTH	2004-06-29 21:25	< 1 s	0.1894877	0.1894862	0.0000005
EARTH	2019-06-28 15:41	< 1 s	0.0602043	0.0602043	0.0000000
EARTH	2034-06-25 10:02	< 1 min	0.0480033	0.0480018	0.0000005
EARTH	2049-06-20 06:17	< 1 min	0.1873750	0.1873731	0.0000006
EARTH	2056-06-28 07:23	< 1 min	0.0715521	0.0715501	0.0000007
EARTH	2071-06-25 19:57	< 1 min	0.0473573	0.0473557	0.0000005
EARTH	2086-06-20 04:28	< 1 s	0.1996097	0.1996096	0.0000000
EARTH	2093-06-28 06:29	< 1 s	0.0538358	0.0538350	0.0000003
EARTH	2108-06-25 12:57	< 1 min	0.0687454	0.0687435	0.0000007
EARTH	2115-07-01 22:30	< 1 s	0.1850264	0.1850243	0.0000007

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
259.20739220	172.54373220	0.00449089	MINIMUM
49.88252756	19.71486388	0.46092833	MINIMUM
340.74492186	273.69678996	0.69000157	SADDLE
150.59876337	112.42126146	0.73850710	SADDLE
347.15785927	107.29213097	1.38112626	SADDLE
186.52602525	313.43293065	2.35238577	MAXIMUM

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MOID Plots

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