Asteroids

9950 ESA help

Last update: 2026-04-06 13:01 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.137

Aphelion (Q)

3.738

Eccentricity (e)

0.533

Inclination (i)

14.6

deg

Orbit period (P)

1390.1

Earth MOID

0.27879

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)

16.2

mag

Diameter

2470

Taxonomic type

Rotation period (T)

6.712

Discovery Information

Discovery Date

1990-11-08

Observatory

Caussols

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.437574

1-sigma variation

8.811E-9

Unit

Eccentricity (e)

Value

0.533360

1-sigma variation

3.014E-8

Unit

Inclination (i)

Value

14.5899

1-sigma variation

4.420E-6

Unit

Long. of Ascending Node (Ω)

Value

253.4016

1-sigma variation

1.381E-5

Unit

Arg. of Perihelion (ω)

Value

103.5964

1-sigma variation

1.448E-5

Unit

Mean Anomaly (M)

Value

126.38834

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.137469

1-sigma variation

Unit

Aphelion distance

Value

3.737679

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.979510

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.564191

1-sigma variation

Unit

MOID

Value

0.278792

1-sigma variation

Unit

Orbit Period

Value

1390.0651

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.76257E-17	-3.08806E-17	3.10902E-15	8.39750E-16	2.07938E-14	-6.40789E-14
e	-3.08806E-17	9.08205E-16	-1.77814E-14	-1.32325E-14	2.07434E-14	-2.84670E-14
i	3.10902E-15	-1.77814E-14	1.95365E-11	-5.83079E-12	4.36562E-12	5.79224E-13
Ω	8.39750E-16	-1.32325E-14	-5.83079E-12	1.90820E-10	-1.86254E-10	1.87654E-12
ω	2.07938E-14	2.07434E-14	4.36562E-12	-1.86254E-10	2.09750E-10	-3.11079E-11
M	-6.40789E-14	-2.84670E-14	5.79224E-13	1.87654E-12	-3.11079E-11	6.40523E-11

Date of computation: 2026-04-06 13:01 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

6.712

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.44-0.56

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

16.161

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.1

Unit

Source

[3]

Diameter

Value

2470

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. (2014) MPB 41,41-47. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2013 JUNE-SEPTEMBER) (1627,9950,11405,24445,152664,168378,329437, 350988,361071,368664,2006EE1,2013OM9,2013QJ10) 2.) Stephens, R.D (2014) MPB 41, 92-95. (ASTEROIDS OBSERVED FROM CS3: 2013 OCTOBER - DECEMBER)(..,9950)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	EARN	1.) Trilling, D.E. et al. (2010) Astron. J. 140, 770-784. (EXPLORENEOs. I. DESCRIPTION AND FIRST RESULTS FROM THE WARM SPITZER NEAR-EARTH OBJECT SURVEY) (diameters & albedos for 101 NEOs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

12932

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.473958

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1990-11-08.79453

Unit

Source

[2]

Last Observation

Value

2026-04-05.297057

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

857 (5)

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

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
13.63914488	278.79015707	0.27879217	MINIMUM
358.21793565	70.50985329	2.11586106	SADDLE
179.15329101	72.29484985	2.78365812	SADDLE
179.89514560	252.71321454	4.71845794	MAXIMUM

Download:

MOID Plots

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