Asteroids

4450 Pan help

Last update: 2025-10-11 14:45 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.596

Aphelion (Q)

2.288

Eccentricity (e)

0.587

Inclination (i)

5.5

deg

Orbit period (P)

632.6

Earth MOID

0.02873

U parameter

0.0

Next Earth close approach

Date

2032-09-03

Nominal distance (from Earth center)

0.0629

9409771

Maximum Brightness

14.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.2

mag

Diameter

900 - 2100*

Taxonomic type

Rotation period (T)

56.48

Discovery Information

Discovery Date

1987-09-25

Observatory

Palomar Mountain

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

1.442206

1-sigma variation

2.288E-9

Unit

Eccentricity (e)

Value

0.586610

1-sigma variation

1.860E-8

Unit

Inclination (i)

Value

5.5241

1-sigma variation

3.080E-6

Unit

Long. of Ascending Node (Ω)

Value

311.6674

1-sigma variation

1.942E-5

Unit

Arg. of Perihelion (ω)

Value

292.0004

1-sigma variation

1.883E-5

Unit

Mean Anomaly (M)

Value

59.71063

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.596194

1-sigma variation

Unit

Aphelion distance

Value

2.288218

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.240073

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.226184

1-sigma variation

Unit

MOID

Value

0.028729

1-sigma variation

Unit

Orbit Period

Value

632.6147

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.23562E-18	1.89616E-17	-4.90484E-16	5.79566E-15	-2.21986E-15	-2.19949E-14
e	1.89616E-17	3.46076E-16	-1.46421E-15	1.01430E-14	1.69736E-14	-6.73468E-14
i	-4.90484E-16	-1.46421E-15	9.48389E-12	1.71314E-11	-1.75524E-11	2.09557E-12
Ω	5.79566E-15	1.01430E-14	1.71314E-11	3.77331E-10	-3.62061E-10	-3.26537E-11
ω	-2.21986E-15	1.69736E-14	-1.75524E-11	-3.62061E-10	3.54444E-10	1.73214E-11
M	-2.19949E-14	-6.73468E-14	2.09557E-12	-3.26537E-11	1.73214E-11	9.34172E-11

Date of computation: 2025-10-11 14:45 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

56.48

Unit

Source

[4]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.64

Unit

mag

Source

[4]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

S/Sr

Unit

Source

[1]

[2]

Taxonomy (all)

Value

S/Sr

Unit

Source

[1]

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.24

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[6]

Diameter

Value

900 - 2100*

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.164

0.469

0.806

Unit

R-I

V-R

B-V

Source

[7]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Radar R

Unit

Source

[1]

[8]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Perna, D. et al. (2016) Astron. J. 151, 11(14p). (GRASPING THE NATURE OF POTENTIALLY HAZARDOUS ASTEROIDS) (spectra of 14 PHAs)
[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]	EARN	1.) Warner, B.D. (2014) MPB 41,113-124. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2013 SEPTEMBER-DECEMBER)(LCs of 36 NEAs) 2.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	Estimation	Estimated from absolute magnitude
[7]	EARN	1.) Lin, C-H. et al. (2018) P&SS 152, 116-135. (Photometric survey and taxonomic identifications of 92 near-Earth asteroids)
[8]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

32388

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.502127

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1937-02-06.981

Unit

Source

[2]

Last Observation

Value

2025-10-10.796955

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1548 (1)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2008-02-13

Unit

Source

[3]

Last Observation

Value

2008-02-13

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

1 (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 4450 Pan 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
VENUS	1954-09-02 23:45	< 1 min	0.0373719	0.0373714	0.0000002
EARTH	1961-09-05 03:18	< 1 s	0.0886086	0.0886086	0.0000000
MARS	1962-12-08 09:43	< 1 s	0.0249533	0.0249531	0.0000001
EARTH	1963-02-16 06:33	< 1 s	0.0412923	0.0412920	0.0000001
EARTH	1987-08-24 13:49	< 1 min	0.1368706	0.1368696	0.0000003
EARTH	2006-09-08 22:34	< 1 s	0.1463569	0.1463566	0.0000001
EARTH	2008-02-19 22:20	< 1 s	0.0408193	0.0408192	0.0000000
EARTH	2032-09-03 17:39	< 1 min	0.0629004	0.0628998	0.0000002
EARTH	2034-02-15 08:31	< 1 min	0.0648855	0.0648845	0.0000003
VENUS	2048-03-12 15:49	< 1 s	0.0302257	0.0302255	0.0000001
EARTH	2058-09-05 10:51	< 1 s	0.0784875	0.0784870	0.0000002
EARTH	2060-02-17 20:05	< 1 s	0.0369067	0.0369063	0.0000001
EARTH	2084-09-11 09:21	< 1 min	0.1903152	0.1903135	0.0000006
EARTH	2086-02-23 22:57	< 1 min	0.1011031	0.1011014	0.0000005
EARTH	2091-08-21 12:45	< 1 min	0.1799410	0.1799396	0.0000005
EARTH	2117-09-01 02:01	< 1 min	0.0615294	0.0615289	0.0000002
EARTH	2119-02-13 07:06	< 1 min	0.1443939	0.1443929	0.0000004

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
302.08543665	46.94230173	0.02872936	MINIMUM
58.71249161	238.65466278	0.04535629	MINIMUM
0.76980454	142.95205554	0.42405594	SADDLE
180.16055192	322.80102490	1.30808802	SADDLE
1.17099611	323.78771392	1.58168580	SADDLE
180.44549867	142.95327717	3.29998515	MAXIMUM

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MOID Plots

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