Asteroids

154029 2002CY46 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

1.016

Aphelion (Q)

2.764

Eccentricity (e)

0.462

Inclination (i)

44.2

deg

Orbit period (P)

948.9

Earth MOID

0.08677

U parameter

0.0

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.5

mag

Diameter

2200

Taxonomic type

S/Sr

Rotation period (T)

2.557

Discovery Information

Discovery Date

2002-02-11

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

1.889770

1-sigma variation

2.273E-9

Unit

Eccentricity (e)

Value

0.462411

1-sigma variation

2.542E-8

Unit

Inclination (i)

Value

44.1959

1-sigma variation

8.335E-6

Unit

Long. of Ascending Node (Ω)

Value

346.1413

1-sigma variation

3.327E-6

Unit

Arg. of Perihelion (ω)

Value

319.3967

1-sigma variation

5.856E-6

Unit

Mean Anomaly (M)

Value

322.73595

1-sigma variation

4.879E-6

Unit

Perihelion distance

Value

1.015919

1-sigma variation

Unit

Aphelion distance

Value

2.763622

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.091668

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.296221

1-sigma variation

Unit

MOID

Value

0.086767

1-sigma variation

Unit

Orbit Period

Value

948.8815

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.16439E-18	1.19124E-17	2.02504E-16	6.69233E-16	8.57963E-16	-5.62978E-15
e	1.19124E-17	6.46357E-16	-2.79954E-14	-7.21501E-15	5.46367E-14	-8.02638E-14
i	2.02504E-16	-2.79954E-14	6.94792E-11	8.55624E-12	-1.19506E-11	7.50992E-12
Ω	6.69233E-16	-7.21501E-15	8.55624E-12	1.10674E-11	-9.18658E-12	1.25683E-12
ω	8.57963E-16	5.46367E-14	-1.19506E-11	-9.18658E-12	3.42925E-11	-2.07340E-11
M	-5.62978E-15	-8.02638E-14	7.50992E-12	1.25683E-12	-2.07340E-11	2.38093E-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

2.557

Unit

Source

[3]

Quality

Value

3,B

Unit

Source

[3]

Amplitude

Value

0.2

Unit

mag

Source

[3]

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]

Taxonomy (all)

Value

K;S

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.507

15.13

Unit

mag

Source

[4]

[5]

Slope Parameter (G)

Value

-0.22

0.15**

Unit

mag

Source

[5]

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.1

Unit

Source

[6]

Diameter

Value

2200

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.46

Unit

V-R

Source

[5]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[7]

[8]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[9]

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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.) Hicks, M. et. (2010) href="http://www.astronomerstelegram.org/?read=2859"> ATel#2859 (Broad-band photometry of the near-Earth asteroid 154029 (2002 CY46): An unusually steep solar phase curve and evidence for complex rotation) 2.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects) 3.) 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)
[3]	EARN	1.) Hicks, M. et. (2010) href="http://www.astronomerstelegram.org/?read=2859"> ATel#2859 (Broad-band photometry of the near-Earth asteroid 154029 (2002 CY46): An unusually steep solar phase curve and evidence for complex rotation) 2.) Warner, B.D. et al. (2011) MPB 38, 32-33. (LIGHTUCURVE ANALYSIS OF THE NEAR-EARTH ASTEROID (154029) 2002 CY46)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Hicks, M. et. (2010) href="http://www.astronomerstelegram.org/?read=2859"> ATel#2859 (Broad-band photometry of the near-Earth asteroid 154029 (2002 CY46): An unusually steep solar phase curve and evidence for complex rotation)
[6]	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.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.
[7]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[8]	EARN	1.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)
[9]	EARN	Earth Asteroids Research Node: https://earn.dlr.de

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8481

Unit

Source

[1]

Unobserved

Value

176

Unit

Source

[1]

Normalized RMS of residuals

Value

0.489943

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2002-02-11.44905

Unit

Source

[2]

Last Observation

Value

2025-05-02.148587

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1032 (12)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2010-09-01

Unit

Source

[3]

Last Observation

Value

2010-09-01

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

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 154029 2002CY46 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	1958-09-02 02:45	< 1 min	0.1691239	0.1691224	0.0000005
EARTH	1971-09-03 08:28	< 1 min	0.1467751	0.1467739	0.0000004
EARTH	1984-09-02 21:03	< 1 min	0.1413393	0.1413385	0.0000003
EARTH	1997-09-03 00:13	< 1 s	0.1446798	0.1446792	0.0000002
EARTH	2010-09-02 11:30	< 1 s	0.1640269	0.1640265	0.0000001
EARTH	2023-09-01 08:24	< 1 s	0.1988293	0.1988289	0.0000001

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
23.87224094	243.12681638	0.08780106	MINIMUM
299.39913779	105.21046767	0.82691211	MINIMUM
317.73347175	131.82112468	0.83936729	SADDLE
345.16753635	7.29085901	1.91185616	SADDLE
163.46419213	22.56437521	1.97078494	SADDLE
187.37963387	216.06259621	3.70322675	MAXIMUM

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MOID Plots

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