Asteroids

196256 2003EH1 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.191

Aphelion (Q)

5.055

Eccentricity (e)

0.619

Inclination (i)

70.9

deg

Orbit period (P)

2015.8

Earth MOID

0.21218

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)

16.1

mag

Diameter

1600 - 4000*

Taxonomic type

Rotation period (T)

12.65

Discovery Information

Discovery Date

2003-03-06

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

3.122961

1-sigma variation

2.243E-8

Unit

Eccentricity (e)

Value

0.618659

1-sigma variation

1.511E-7

Unit

Inclination (i)

Value

70.8747

1-sigma variation

3.014E-5

Unit

Long. of Ascending Node (Ω)

Value

283.0012

1-sigma variation

3.906E-5

Unit

Arg. of Perihelion (ω)

Value

171.3389

1-sigma variation

4.193E-5

Unit

Mean Anomaly (M)

Value

78.71030

1-sigma variation

0.00002

Unit

Perihelion distance

Value

1.190915

1-sigma variation

Unit

Aphelion distance

Value

5.055008

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

3.946291

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.212624

1-sigma variation

Unit

MOID

Value

0.212175

1-sigma variation

Unit

Orbit Period

Value

2015.8039

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.03224E-16	4.92566E-16	1.95805E-13	2.25744E-13	3.94443E-13	-2.98507E-13
e	4.92566E-16	2.28439E-14	1.07281E-12	1.45561E-12	3.68493E-12	-8.13614E-13
i	1.95805E-13	1.07281E-12	9.08544E-10	8.10065E-10	-1.91767E-11	-7.33584E-11
Ω	2.25744E-13	1.45561E-12	8.10065E-10	1.52537E-9	-3.26054E-10	-9.65239E-12
ω	3.94443E-13	3.68493E-12	-1.91767E-11	-3.26054E-10	1.75851E-9	-5.20318E-10
M	-2.98507E-13	-8.13614E-13	-7.33584E-11	-9.65239E-12	-5.20318E-10	2.60834E-10

Date of computation: 2026-06-04 23:11 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

12.65

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.44

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

16.056

15.82

Unit

mag

Source

[2]

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

1600 - 4000*

Unit

Source

[3]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.69

0.39

0.38

Unit

B-V

V-R

R-I

Source

[1]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Kasuga, T. & D. Jewitt (2015) Astron. J. 150, 152(10pp). (Physical Observations of (196256) 2003 EH1, Presumed Parent of the Quadrantid Meteoroid Stream)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8055

Unit

Source

[1]

Unobserved

Value

467

Unit

Source

[1]

Normalized RMS of residuals

Value

0.57672

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2003-03-06.10873

Unit

Source

[2]

Last Observation

Value

2025-03-25.245279

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

150 (2)

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

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

Close Approaches for 196256 2003EH1 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
JUPITER	1972-10-25 07:33	< 1 min	0.2768700	0.2768632	0.0000023
JUPITER	2055-11-24 13:11	< 1 min	0.5650162	0.5650078	0.0000028
JUPITER	2067-08-16 16:32	< 1 min	0.4171565	0.4171539	0.0000009

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
3.86370765	1.43522797	0.21172541	MINIMUM
333.46278944	152.20849827	2.14180905	SADDLE
177.14566834	178.36103620	4.05115359	SADDLE
181.46636046	359.06606639	6.03005142	MAXIMUM

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MOID Plots

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