Asteroids

136849 1998CS1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.629

Aphelion (Q)

2.354

Eccentricity (e)

0.578

Inclination (i)

7.8

deg

Orbit period (P)

665.3

Earth MOID

0.01966

U parameter

0.0

Next Earth close approach

Date

2027-07-19

Nominal distance (from Earth center)

0.07656

11453566

Maximum Brightness

15.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.7

mag

Diameter

800 - 1700*

Taxonomic type

Rotation period (T)

2.765

Discovery Information

Discovery Date

1998-02-09

Observatory

Peking Observatory, Xinglong Station

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

1.491507

1-sigma variation

2.209E-9

Unit

Eccentricity (e)

Value

0.578268

1-sigma variation

1.999E-8

Unit

Inclination (i)

Value

7.7915

1-sigma variation

2.759E-6

Unit

Long. of Ascending Node (Ω)

Value

110.6680

1-sigma variation

1.239E-5

Unit

Arg. of Perihelion (ω)

Value

97.8118

1-sigma variation

1.336E-5

Unit

Mean Anomaly (M)

Value

61.05050

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.629016

1-sigma variation

Unit

Aphelion distance

Value

2.353998

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.093914

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.097686

1-sigma variation

Unit

MOID

Value

0.019655

1-sigma variation

Unit

Orbit Period

Value

665.3289

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.87824E-18	2.66458E-17	4.04949E-16	-9.99155E-15	1.36129E-14	-1.63451E-14
e	2.66458E-17	3.99580E-16	4.49720E-15	-8.98553E-14	1.48484E-13	-8.78893E-14
i	4.04949E-16	4.49720E-15	7.61088E-12	2.40926E-13	3.44557E-13	-1.51432E-12
Ω	-9.99155E-15	-8.98553E-14	2.40926E-13	1.53543E-10	-1.61468E-10	3.74864E-11
ω	1.36129E-14	1.48484E-13	3.44557E-13	-1.61468E-10	1.78365E-10	-4.93451E-11
M	-1.63451E-14	-8.78893E-14	-1.51432E-12	3.74864E-11	-4.93451E-11	5.49852E-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

2.765

Unit

Source

[6]

[1]

Quality

Value

2,R

Unit

Source

[6]

Amplitude

Value

0.2

0.14

Unit

mag

Source

[6]

[1]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

118

Unit

Source

[1]

Spinvector B

Value

-2

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

[3]

[4]

Taxonomy (all)

Value

Unit

Source

[5]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.689

Unit

mag

Source

[7]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[7]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[8]

Diameter

Value

800 - 1700*

Unit

Source

[8]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.6404

0.6192

0.1985

0.8389

-0.021

-0.219

Unit

g-r

g-z

r-i

g-i

r-z

i-z

Source

[2]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[9]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS): Paper 3. Skiff, Brian A et al.
[2]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[3]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[4]	EARN	1.) 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)
[5]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[6]	EARN	1.) Ye, Q. (2010) MPB 37, 75. (REVISION: PHOTOMETRIC OBSERVATIONS AND LIGHTCURVE ANALYSIS OF NEAR-EARTH ASTEROIDS (136849) 1998 CS1, 2006 SZ217, AND 2008 UE7) 2.) Ye, Q. et al. (2009) MPB 36, 180-181. (PHOTOMETRIC OBSERVATIONS AND LIGHTCURVE ANALYSIS OF NEAR-EARTH ASTEROIDS (136849) 1998 CS1, 2006 SZ217, AND 2008 UE7) 3.) Ye, Q. (2010) MPB 37, 75. (Revision: Photometric Observations and Lightcurve Analysis of Near-Earth Asteroids (136849) 1998 CS1, 2006 SZ217, and 2008 UE7) 4.) Skiff, B.A. et al. (2012) MPB 39, 111-130. (LOWELL OBSERVATORY NEAR-EARTH ASTEROID PHOTOMETRIC SURVEY (NEAPS) - 2008 MAY THROUGH 2008 DECEMBER) (46 NEAs)
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	Estimation	Estimated from absolute magnitude
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Benner, L.A.M. et al. (2009) DPS 41, 4309. (Arecibo and Goldstone Radar Images of Near-Earth Asteroid (136849) 1998 CS1)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9868

Unit

Source

[1]

Unobserved

Value

256

Unit

Source

[1]

Normalized RMS of residuals

Value

0.557693

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-02-09.47453

Unit

Source

[2]

Last Observation

Value

2025-02-15.553964

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

766 (9)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2009-01-13

Unit

Source

[3]

Last Observation

Value

2009-01-17

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

3 (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 136849 1998CS1 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	1958-01-12 21:26	< 1 s	0.1152040	0.1152035	0.0000002
EARTH	1976-07-06 04:14	< 1 min	0.1981991	0.1981982	0.0000003
EARTH	1978-01-23 04:05	< 1 min	0.0771564	0.0771555	0.0000003
EARTH	1996-07-24 02:22	< 1 min	0.0352940	0.0352933	0.0000003
VENUS	2003-08-27 13:42	< 1 s	0.0326106	0.0326104	0.0000000
EARTH	2009-01-17 17:57	< 1 s	0.0291222	0.0291222	0.0000000
EARTH	2027-07-19 00:02	< 1 min	0.0765624	0.0765618	0.0000002
EARTH	2047-07-29 21:25	< 1 min	0.1133161	0.1133153	0.0000003
EARTH	2060-01-15 23:37	< 1 s	0.0822436	0.0822433	0.0000001
EARTH	2080-01-20 18:50	< 1 min	0.0242377	0.0242366	0.0000004
VENUS	2094-09-11 22:44	< 1 min	0.0336841	0.0336775	0.0000022
EARTH	2098-07-17 06:16	1.1	0.1041948	0.1041634	0.0000105
EARTH	2100-01-31 02:32	1.5	0.1660236	0.1659846	0.0000130
EARTH	2118-07-23 02:45	2.7	0.0435407	0.0434695	0.0000237

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
305.67599648	16.33057232	0.01969806	MINIMUM
56.06712029	198.14596307	0.02338901	MINIMUM
1.37297294	107.56015205	0.39041969	SADDLE
180.37593931	286.89675409	1.37449120	SADDLE
1.82279758	288.45969776	1.62054842	SADDLE
180.60482324	107.01954945	3.35231737	MAXIMUM

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MOID Plots

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