Asteroids

23187 2000PN9 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.758

Aphelion (Q)

2.936

Eccentricity (e)

0.589

Inclination (i)

51.3

deg

Orbit period (P)

916.8

Earth MOID

0.01393

U parameter

0.0

Next Earth close approach

Date

2124-02-26

Nominal distance (from Earth center)

0.18329

27419815

Maximum Brightness

15.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

1700 - 4000*

Taxonomic type

Rotation period (T)

2.533

Discovery Information

Discovery Date

2000-08-08

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

1.846972

1-sigma variation

7.229E-10

Unit

Eccentricity (e)

Value

0.589372

1-sigma variation

1.059E-8

Unit

Inclination (i)

Value

51.3362

1-sigma variation

5.272E-6

Unit

Long. of Ascending Node (Ω)

Value

164.2808

1-sigma variation

5.352E-7

Unit

Arg. of Perihelion (ω)

Value

293.5420

1-sigma variation

2.555E-6

Unit

Mean Anomaly (M)

Value

43.07107

1-sigma variation

1.672E-6

Unit

Perihelion distance

Value

0.758418

1-sigma variation

Unit

Aphelion distance

Value

2.935527

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.015873

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.568174

1-sigma variation

Unit

MOID

Value

0.013932

1-sigma variation

Unit

Orbit Period

Value

916.8304

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.22579E-19	-4.41974E-18	-1.84868E-16	5.29829E-17	-6.48422E-17	-9.13792E-16
e	-4.41974E-18	1.12200E-16	4.74170E-16	-1.55023E-15	-1.64719E-14	7.62544E-15
i	-1.84868E-16	4.74170E-16	2.77992E-11	1.56089E-12	-1.99928E-12	1.22491E-12
Ω	5.29829E-17	-1.55023E-15	1.56089E-12	2.86483E-13	-5.32633E-13	4.06144E-13
ω	-6.48422E-17	-1.64719E-14	-1.99928E-12	-5.32633E-13	6.52799E-12	-1.63315E-12
M	-9.13792E-16	7.62544E-15	1.22491E-12	4.06144E-13	-1.63315E-12	2.79668E-12

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

2.533

Unit

Source

[5]

Quality

Value

Unit

Source

[5]

Amplitude

Value

0.15

Unit

mag

Source

[5]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Sq/Q

Unit

Source

[1]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.011

Unit

mag

Source

[6]

Slope Parameter (G)

Value

0.15**

Unit

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[7]

Diameter

Value

1700 - 4000*

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.48

0.9

Unit

V-R

B-V

Source

[8]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[9]

[10]

Download this part as:

Sources

No.	Name	Additional
[1]	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)
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	1.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects) 2.) 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)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Belskaya, I.N. et al. (2009) Icarus 201, 167-171. (Polarimetry and BVRI photometry of the potentially hazardous near-Earth Asteroid (23187) 2000 PN9) 2.) Krugly, Yu. N. et al. (2006) IAU Symp. 236, 385-390. (Kharkiv study of near-Earth asteroids) (1036,1627,1685, 1862,1980,3103,3200,4179,6611,8567,11405,13553,23187,54509, 66251,100085,1999LF6,2004XP14,2005AB,2006CV69,2006BQ6) 3.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods" 4.) Warner, B.D. (2016) MPB 43, 240-250. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2016 JANUARY-APRIL)(38NEAs)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	Estimation	Estimated from absolute magnitude
[8]	EARN	1.) Belskaya, I.N. et al. (2009) Icarus 201, 167-171. (Polarimetry and BVRI photometry of the potentially hazardous near-Earth Asteroid (23187) 2000 PN9)
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[10]	EARN	1.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

13096

Unit

Source

[1]

Unobserved

Value

149

Unit

Source

[1]

Normalized RMS of residuals

Value

0.426941

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1990-08-02.39583

Unit

Source

[2]

Last Observation

Value

2026-06-10.197487

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

2704 (9)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2001-03-03

Unit

Source

[3]

Last Observation

Value

2006-03-07

Unit

Source

[3]

Delay (Discarded)

Value

6 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

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

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Max residual (arcsec):

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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 23187 2000PN9 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	1996-02-27 17:22	< 1 s	0.1457968	0.1457967	0.0000000
EARTH	2001-03-02 17:28	< 1 s	0.0609795	0.0609794	0.0000000
EARTH	2006-03-06 04:23	< 1 s	0.0203412	0.0203411	0.0000000
EARTH	2011-03-10 23:42	< 1 s	0.1169100	0.1169099	0.0000000
EARTH	2124-02-26 22:50	< 1 min	0.1832901	0.1832890	0.0000004

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
37.16159399	59.35321294	0.01393155	MINIMUM
301.53519251	252.11125182	0.38777591	MINIMUM
346.73289982	327.33859434	0.78809504	SADDLE
351.90799708	162.67573568	1.61690622	SADDLE
170.17998722	178.08605826	2.35924802	SADDLE
187.43118068	9.53515468	3.69844328	MAXIMUM

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MOID Plots

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