Asteroids

523609 2005PJ2 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.408

Aphelion (Q)

1.988

Eccentricity (e)

0.659

Inclination (i)

17.4

deg

Orbit period (P)

479.0

Earth MOID

0.04446

U parameter

0.0

Next Earth close approach

Date

2026-08-27

Nominal distance (from Earth center)

0.04731

7077346

Maximum Brightness

15.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.5

mag

Diameter

300 - 700*

Taxonomic type

Rotation period (T)

1.420

Discovery Information

Discovery Date

2005-08-04

Observatory

Palomar Mountain/NEAT

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

1.198164

1-sigma variation

2.858E-9

Unit

Eccentricity (e)

Value

0.659381

1-sigma variation

1.758E-7

Unit

Inclination (i)

Value

17.4275

1-sigma variation

1.702E-5

Unit

Long. of Ascending Node (Ω)

Value

326.4191

1-sigma variation

1.155E-5

Unit

Arg. of Perihelion (ω)

Value

128.9101

1-sigma variation

2.225E-5

Unit

Mean Anomaly (M)

Value

260.42901

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.408117

1-sigma variation

Unit

Aphelion distance

Value

1.988211

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.143555

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.508780

1-sigma variation

Unit

MOID

Value

0.044461

1-sigma variation

Unit

Orbit Period

Value

479.0411

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.16859E-18	3.17958E-16	1.39855E-14	-1.62370E-16	3.38024E-14	-4.80922E-14
e	3.17958E-16	3.09140E-14	1.37713E-12	-4.01696E-13	3.18311E-12	-1.34760E-12
i	1.39855E-14	1.37713E-12	2.89762E-10	-1.16220E-10	2.58404E-10	-1.19230E-10
Ω	-1.62370E-16	-4.01696E-13	-1.16220E-10	1.33387E-10	-1.76453E-10	3.62466E-11
ω	3.38024E-14	3.18311E-12	2.58404E-10	-1.76453E-10	4.95007E-10	-2.19987E-10
M	-4.80922E-14	-1.34760E-12	-1.19230E-10	3.62466E-11	-2.19987E-10	3.59325E-10

Date of computation: 2026-06-04 23:11 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

1.420

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.8

Unit

mag

Source

[1]

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

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.495

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

300 - 700*

Unit

Source

[3]

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.) Higley, S. et al. (2008) MPB 35, 175-177. ("DO WHAT YOU CAN PHOTOMETRY": UNFILTERED PHOTOMETRY OF NEOS 2005 PJ2, 2005 WC1, AND 2006 GY2)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

6231

Unit

Source

[1]

Unobserved

Value

1431

Unit

Source

[1]

Normalized RMS of residuals

Value

0.490002

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-07-27.40327

Unit

Source

[2]

Last Observation

Value

2022-08-18.187962

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

196 (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

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - 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 523609 2005PJ2 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	1967-08-26 00:01	< 1 min	0.0589803	0.0589787	0.0000005
EARTH	1988-08-20 02:40	< 1 min	0.1756847	0.1756836	0.0000003
EARTH	2005-08-30 09:45	< 1 s	0.1009779	0.1009774	0.0000002
EARTH	2026-08-27 01:59	< 1 min	0.0473091	0.0473087	0.0000002
EARTH	2047-08-22 04:53	< 1 min	0.1542500	0.1542459	0.0000013
EARTH	2064-08-31 01:21	< 1 min	0.1196027	0.1195975	0.0000018
EARTH	2085-08-27 12:09	< 1 min	0.0480049	0.0480041	0.0000003
EARTH	2106-08-23 16:15	< 1 min	0.1470057	0.1469923	0.0000045
EARTH	2123-09-02 08:05	< 1 min	0.1279169	0.1279000	0.0000057

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
282.65997863	233.47053857	0.04427065	MINIMUM
69.38208981	105.41345625	0.27165049	MINIMUM
354.63675419	344.00233613	0.59776910	SADDLE
176.96923836	173.90104661	1.02707087	SADDLE
357.47311980	170.13210426	1.41741411	SADDLE
180.94492869	355.73768422	2.95374451	MAXIMUM

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MOID Plots

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