Asteroids

137199 1999KX4 help

Last update: 2025-05-21 08:47 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Amor

Perihelion (q)

1.031

Aphelion (Q)

1.884

Eccentricity (e)

0.293

Inclination (i)

16.6

deg

Orbit period (P)

642.6

Earth MOID

0.19061

U parameter

0.0

Next Earth close approach

Date

2064-01-28

Nominal distance (from Earth center)

0.19898

29767346

Maximum Brightness

15.1

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

16.9

mag

Diameter

810

Taxonomic type

Rotation period (T)

2.767

Discovery Information

Discovery Date

1999-05-20

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.457370

1-sigma variation

9.881E-10

Unit

Eccentricity (e)

Value

0.292601

1-sigma variation

1.230E-8

Unit

Inclination (i)

Value

16.5694

1-sigma variation

2.006E-6

Unit

Long. of Ascending Node (Ω)

Value

104.8781

1-sigma variation

5.743E-6

Unit

Arg. of Perihelion (ω)

Value

76.4927

1-sigma variation

7.039E-6

Unit

Mean Anomaly (M)

Value

323.80309

1-sigma variation

3.437E-6

Unit

Perihelion distance

Value

1.030942

1-sigma variation

Unit

Aphelion distance

Value

1.883798

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.263788

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.413939

1-sigma variation

Unit

MOID

Value

0.190613

1-sigma variation

Unit

Orbit Period

Value

642.6182

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.76366E-19	1.46419E-18	-6.94225E-16	-9.87834E-16	1.73509E-15	-2.06715E-15
e	1.46419E-18	1.51348E-16	-2.38350E-15	-2.64297E-15	-2.24709E-16	-2.28280E-15
i	-6.94225E-16	-2.38350E-15	4.02579E-12	-6.98044E-12	9.19153E-12	-1.24555E-12
Ω	-9.87834E-16	-2.64297E-15	-6.98044E-12	3.29799E-11	-3.23902E-11	1.90568E-12
ω	1.73509E-15	-2.24709E-16	9.19153E-12	-3.23902E-11	4.95410E-11	-1.42033E-11
M	-2.06715E-15	-2.28280E-15	-1.24555E-12	1.90568E-12	-1.42033E-11	1.18114E-11

Date of computation: 2025-05-21 08:47 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

2.767

Unit

Source

[1]

[3]

Quality

Value

3,B,U

Unit

Source

[3]

Amplitude

Value

0.12

0.12-0.35

Unit

mag

Source

[1]

[3]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

101

Unit

Source

[1]

Spinvector B

Value

-8

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.883

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.454

Unit

Source

[5]

Diameter

Value

810

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.329

0.808

0.488

Unit

R-I

B-V

V-R

Source

[6]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[7]

[2]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Near-Earth Asteroid Lightcurve Analysis at the Center for Solar System Studies: 2019 September-2020 January, B.D. Warner
[2]	EARN	1.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5132"> ATel#5132 (Palomar Spectroscopy of Near-Earth Asteroids 137199 (1999 KX4), 152756 (1999 JV3), 163249 (2002 GT), 163364 (2002 OD20), and 285263 (1998 QE2))
[3]	EARN	1.) Warner, B.D. (2013) MPB 40, 137-145. (ASTEROID LIGHTCURVE ANALYSIS AT THE PALMER DIVIDE OBSERVATORY: 2013 JANUARY - MARCH) (..,11405,137199,154347,343098,349068,2013BE19) 2.) Sanchez, J.A. et al. (2013) Icarus 225, 131-140. (Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids) (,4055,19764,89830, 138404,143381,159609,164121,241662,2007ML13)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[6]	EARN	1.) Lin, C-H. et al. (2018) P&SS 152, 116-135. (Photometric survey and taxonomic identifications of 92 near-Earth asteroids)
[7]	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

16979

Unit

Source

[1]

Unobserved

Value

151

Unit

Source

[1]

Normalized RMS of residuals

Value

0.387474

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1978-08-10.6207

Unit

Source

[2]

Last Observation

Value

2025-02-03.592604

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

3768 (6)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2013-05-11

Unit

Source

[3]

Last Observation

Value

2013-05-11

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 137199 1999KX4 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	1969-01-28 09:57	< 1 s	0.1900831	0.1900830	0.0000000
EARTH	2064-01-28 06:57	< 1 s	0.1989824	0.1989822	0.0000001
EARTH	2108-01-31 00:42	< 1 s	0.1945382	0.1945380	0.0000001

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
320.25521100	25.79392081	0.19061268	MINIMUM
49.26365555	143.42457298	0.26054923	MINIMUM
12.81252233	95.62615843	0.29639753	SADDLE
184.47614603	262.53116545	0.96273811	SADDLE
4.15685606	263.47528881	2.01282156	SADDLE
180.39602092	79.38438579	2.85481232	MAXIMUM

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MOID Plots

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