Asteroids

217807 2000XK44 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.060

Aphelion (Q)

2.389

Eccentricity (e)

0.385

Inclination (i)

11.2

deg

Orbit period (P)

827.0

Earth MOID

0.07278

U parameter

0.0

Next Earth close approach

Date

2052-11-09

Nominal distance (from Earth center)

0.09006

13473295

Maximum Brightness

14.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.3

mag

Diameter

730

Taxonomic type

Rotation period (T)

25.70

Discovery Information

Discovery Date

2000-12-05

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

1.724233

1-sigma variation

2.284E-9

Unit

Eccentricity (e)

Value

0.385368

1-sigma variation

6.822E-9

Unit

Inclination (i)

Value

11.2361

1-sigma variation

4.320E-6

Unit

Long. of Ascending Node (Ω)

Value

48.0955

1-sigma variation

5.754E-6

Unit

Arg. of Perihelion (ω)

Value

347.6747

1-sigma variation

9.995E-6

Unit

Mean Anomaly (M)

Value

34.48857

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.059769

1-sigma variation

Unit

Aphelion distance

Value

2.388696

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.076291

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.343721

1-sigma variation

Unit

MOID

Value

0.072777

1-sigma variation

Unit

Orbit Period

Value

826.9746

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.21720E-18	1.55946E-18	7.06236E-16	-7.62672E-16	4.25961E-15	-1.33206E-14
e	1.55946E-18	4.65366E-17	1.03969E-15	3.12947E-14	-5.36522E-14	1.02629E-14
i	7.06236E-16	1.03969E-15	1.86618E-11	-2.04032E-12	9.54477E-13	-1.42999E-12
Ω	-7.62672E-16	3.12947E-14	-2.04032E-12	3.31095E-11	-5.01083E-11	1.17147E-11
ω	4.25961E-15	-5.36522E-14	9.54477E-13	-5.01083E-11	9.99060E-11	-3.37315E-11
M	-1.33206E-14	1.02629E-14	-1.42999E-12	1.17147E-11	-3.37315E-11	4.02683E-11

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

25.70

Unit

Source

[5]

Quality

Value

2,T,U

Unit

Source

[5]

Amplitude

Value

>=1.0

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

Scomp

Unit

Source

[1]

[2]

Taxonomy (all)

Value

S;Q

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.329

Unit

mag

Source

[6]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.28

Unit

Source

[7]

Diameter

Value

730

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.48

0.87

Unit

V-R

B-V

Source

[8]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[9]

[10]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[4]

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.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2371"> ATel2371 (217807 (2000 XK44): Broad-band photometry of a slowly rotating near-Earth asteroid) 2.) Hicks, M. & K. Lawrence (2009) href="http://www.astronomerstelegram.org/?read=2323"> ATel#2323 (Planetary radar targets 1999 AP10, 2000 TO64, 2000 UJ1, and 2000 XK44: Four S-complex near-Earth asteroids) 3.) Somers, J.M. et al. (2010) DPS 42, 1316. (abstract) (Optical Characterization Of Planetary Radar Targets, Low-deltaV, And Potentially Hazardous Asteroids: Results From 2009-2010) 4.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects) 5.) 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.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2371"> ATel2371 (217807 (2000 XK44): Broad-band photometry of a slowly rotating near-Earth asteroid)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Mueller, M. et al. (2011) Astron. J. 141, 109. (ExploreNEOs. III. PHYSICAL CHARACTERIZATION OF 65 POTENTIAL SPACECRAFT TARGET ASTEROIDS)
[8]	EARN	1.) Betzler, A. et al. (2010) MPB 37, 95-97. (Photometric Observations of the Near-Earth Asteroids 1999 AP10 2000 TO64, 2000 UJ1, 2000 XK44, 2001 MZ7, 2003 QO104, 2005 RQ6, 2005 WJ56, and 2009 UN3)
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[10]	EARN	1.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2371"> ATel2371 (217807 (2000 XK44): Broad-band photometry of a slowly rotating near-Earth asteroid) 2.) Hicks, M. & K. Lawrence (2009) href="http://www.astronomerstelegram.org/?read=2323"> ATel#2323 (Planetary radar targets 1999 AP10, 2000 TO64, 2000 UJ1, and 2000 XK44: Four S-complex near-Earth asteroids)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

17827

Unit

Source

[1]

Unobserved

Value

508

Unit

Source

[1]

Normalized RMS of residuals

Value

0.49096

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1975-07-16.63015

Unit

Source

[2]

Last Observation

Value

2024-05-06.35503

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

498 (2)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2009-11-08

Unit

Source

[3]

Last Observation

Value

2009-11-10

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

3 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

6 (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 217807 2000XK44 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	1966-10-25 18:56	< 1 min	0.1326085	0.1326072	0.0000005
EARTH	2009-11-04 09:33	< 1 s	0.0739488	0.0739488	0.0000000
EARTH	2052-11-09 20:17	< 1 min	0.0900634	0.0900625	0.0000003
EARTH	2086-10-29 02:53	< 1 min	0.1106966	0.1106945	0.0000007

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
4.78250805	301.54907074	0.07293504	MINIMUM
178.28359265	112.27151814	1.38394190	SADDLE
357.35856390	110.69405826	2.06525664	SADDLE
179.48535235	293.06504753	3.38129912	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out