Asteroids

139289 2001KR1 help

Last update: 2025-07-29 02:36 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.200

Aphelion (Q)

2.319

Eccentricity (e)

0.841

Inclination (i)

23.3

deg

Orbit period (P)

516.4

Earth MOID

0.17783

U parameter

0.0

Next Earth close approach

Date

2059-06-11

Nominal distance (from Earth center)

0.17719

26507107

Maximum Brightness

17.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.8

mag

Diameter

1200

Taxonomic type

Rotation period (T)

11.30

Discovery Information

Discovery Date

2001-05-18

Observatory

Lowell Observatory-LONEOS

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

1.259633

1-sigma variation

2.347E-9

Unit

Eccentricity (e)

Value

0.841189

1-sigma variation

3.005E-8

Unit

Inclination (i)

Value

23.2643

1-sigma variation

5.545E-6

Unit

Long. of Ascending Node (Ω)

Value

102.7017

1-sigma variation

1.791E-5

Unit

Arg. of Perihelion (ω)

Value

291.4917

1-sigma variation

1.598E-5

Unit

Mean Anomaly (M)

Value

287.54155

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.200044

1-sigma variation

Unit

Aphelion distance

Value

2.319221

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.702123

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.483791

1-sigma variation

Unit

MOID

Value

0.177827

1-sigma variation

Unit

Orbit Period

Value

516.3738

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.50820E-18	-3.00751E-18	2.06636E-16	5.63412E-15	-4.10228E-15	-1.39748E-14
e	-3.00751E-18	9.03010E-16	3.93293E-15	4.08632E-14	1.50289E-14	3.95107E-14
i	2.06636E-16	3.93293E-15	3.07466E-11	-8.07972E-11	7.26549E-11	8.37029E-12
Ω	5.63412E-15	4.08632E-14	-8.07972E-11	3.20716E-10	-2.81160E-10	-6.35527E-11
ω	-4.10228E-15	1.50289E-14	7.26549E-11	-2.81160E-10	2.55418E-10	5.05278E-11
M	-1.39748E-14	3.95107E-14	8.37029E-12	-6.35527E-11	5.05278E-11	6.43810E-11

Date of computation: 2025-07-29 02:36 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

11.30

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.47

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

17.848

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.104

0.127

Unit

Source

[3]

[4]

Diameter

Value

1200

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.) Warner, B.D. (2018) MPB 45, 366-379. (Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2018 April-June)(39 NEAs)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[4]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs) 2.) Campins, H. et al. (2009) Earth Moon and Planets 105, 159-165. (Low perihelion near-Earth asteroids) 3.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8811

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.595309

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-05-18.39451

Unit

Source

[2]

Last Observation

Value

2025-07-02.327719

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

870 (8)

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

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 139289 2001KR1 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
MERCURY	1950-09-01 13:11	< 1 min	0.0300776	0.0300762	0.0000005
MERCURY	1970-07-08 00:32	< 1 min	0.0206427	0.0206402	0.0000008
MERCURY	1983-03-08 21:55	< 1 min	0.0375342	0.0375327	0.0000005
MERCURY	2003-01-11 07:13	< 1 min	0.0355696	0.0355682	0.0000005
MERCURY	2015-09-11 23:11	< 1 s	0.0252635	0.0252630	0.0000001
EARTH	2018-06-12 19:23	< 1 s	0.1884885	0.1884882	0.0000001
MERCURY	2035-07-18 01:43	< 1 min	0.0360943	0.0360923	0.0000006
MERCURY	2048-03-17 13:47	< 1 min	0.0216566	0.0216554	0.0000004
EARTH	2059-06-11 19:24	< 1 min	0.1771891	0.1771887	0.0000001
MERCURY	2080-09-20 20:03	< 1 min	0.0152161	0.0152157	0.0000001
EARTH	2100-06-11 02:43	< 1 min	0.1712861	0.1712858	0.0000001
MERCURY	2113-03-28 19:04	< 1 min	0.0146414	0.0146385	0.0000010

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
286.51132813	156.34619299	0.17782702	MINIMUM
69.06572567	62.82972478	0.35897866	MINIMUM
355.48675896	282.10486280	0.81402656	SADDLE
355.92874125	103.73063047	1.19223202	SADDLE
178.28285467	112.73177494	1.43231795	SADDLE
180.40410945	293.40128332	3.26358152	MAXIMUM

Download:

MOID Plots

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