Asteroids

297300 1998SC15 help

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

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.745

Aphelion (Q)

1.801

Eccentricity (e)

0.414

Inclination (i)

16.1

deg

Orbit period (P)

524.6

Earth MOID

0.00075

U parameter

0.0

Next Earth close approach

Date

2042-04-07

Nominal distance (from Earth center)

0.03223

4822007

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.3

mag

Diameter

400 - 800*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1998-09-23

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

1.273009

1-sigma variation

1.128E-9

Unit

Eccentricity (e)

Value

0.414440

1-sigma variation

1.963E-8

Unit

Inclination (i)

Value

16.0817

1-sigma variation

5.239E-6

Unit

Long. of Ascending Node (Ω)

Value

198.6755

1-sigma variation

7.037E-6

Unit

Arg. of Perihelion (ω)

Value

277.4981

1-sigma variation

8.184E-6

Unit

Mean Anomaly (M)

Value

114.83871

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.745424

1-sigma variation

Unit

Aphelion distance

Value

1.800595

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.001268

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.116746

1-sigma variation

Unit

MOID

Value

0.000754

1-sigma variation

Unit

Orbit Period

Value

524.6211

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.27248E-18	1.54948E-17	4.39274E-16	2.59101E-16	6.81449E-16	-4.20594E-15
e	1.54948E-17	3.85477E-16	-4.41123E-15	1.57779E-14	2.88435E-14	-5.21535E-14
i	4.39274E-16	-4.41123E-15	2.74423E-11	-6.24143E-12	7.41060E-12	-3.66280E-12
Ω	2.59101E-16	1.57779E-14	-6.24143E-12	4.95222E-11	-4.99346E-11	4.76236E-12
ω	6.81449E-16	2.88435E-14	7.41060E-12	-4.99346E-11	6.69750E-11	-1.97981E-11
M	-4.20594E-15	-5.21535E-14	-3.66280E-12	4.76236E-12	-1.97981E-11	2.74656E-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

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.305

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

400 - 800*

Unit

Source

[4]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude
[5]	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

9460

Unit

Source

[1]

Unobserved

Value

379

Unit

Source

[1]

Normalized RMS of residuals

Value

0.501161

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-09-23.13307

Unit

Source

[2]

Last Observation

Value

2024-08-17.61392

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

594 (13)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2011-10-12

Unit

Source

[3]

Last Observation

Value

2011-10-12

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

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 297300 1998SC15 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	1950-04-12 09:53	< 1 s	0.0696159	0.0696157	0.0000000
EARTH	1952-10-28 00:32	< 1 s	0.1923370	0.1923368	0.0000001
EARTH	1965-10-15 06:44	< 1 s	0.1797748	0.1797745	0.0000001
EARTH	1973-04-15 10:26	< 1 s	0.1312188	0.1312181	0.0000002
EARTH	1988-10-18 06:28	< 1 s	0.1135166	0.1135162	0.0000001
EARTH	1996-04-18 07:08	< 1 s	0.1910627	0.1910621	0.0000002
EARTH	2009-03-23 16:20	< 1 s	0.1988580	0.1988577	0.0000001
EARTH	2011-10-18 18:12	< 1 s	0.1214845	0.1214844	0.0000000
EARTH	2019-04-16 16:00	< 1 s	0.1405111	0.1405109	0.0000001
EARTH	2042-04-07 04:31	< 1 min	0.0322331	0.0322326	0.0000002
EARTH	2044-10-22 20:58	< 1 s	0.0650635	0.0650634	0.0000000
EARTH	2052-04-16 17:20	< 1 min	0.1522698	0.1522691	0.0000002
EARTH	2085-03-29 23:44	< 1 min	0.1455128	0.1455095	0.0000011
EARTH	2087-10-18 18:21	< 1 min	0.1259085	0.1259058	0.0000009
EARTH	2095-04-09 02:11	< 1 min	0.0084749	0.0084723	0.0000009
EARTH	2097-10-19 17:49	< 1 min	0.0844878	0.0844748	0.0000043

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
58.98063106	95.63202631	0.00075439	MINIMUM
297.46362026	287.70316892	0.06299716	MINIMUM
357.51904225	10.00674696	0.33734586	SADDLE
178.80564360	193.56833612	0.86989089	SADDLE
359.94324162	193.82944729	1.74463219	SADDLE
180.79263470	14.90486456	2.76021936	MAXIMUM

Download:

MOID Plots

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