Asteroids

451397 2011EZ78 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.091

Aphelion (Q)

3.693

Eccentricity (e)

0.544

Inclination (i)

17.9

deg

Orbit period (P)

1351.3

Earth MOID

0.07323

U parameter

0.0

Next Earth close approach

Date

2100-07-14

Nominal distance (from Earth center)

0.08188

12248884

Maximum Brightness

12.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.1

mag

Diameter

1000 - 2300*

Taxonomic type

Rotation period (T)

3.115

Discovery Information

Discovery Date

2011-03-15

Observatory

Mt. Lemmon Survey

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

2.392007

1-sigma variation

1.235E-8

Unit

Eccentricity (e)

Value

0.543813

1-sigma variation

6.986E-9

Unit

Inclination (i)

Value

17.9436

1-sigma variation

5.203E-6

Unit

Long. of Ascending Node (Ω)

Value

109.8170

1-sigma variation

8.004E-6

Unit

Arg. of Perihelion (ω)

Value

179.7341

1-sigma variation

1.087E-5

Unit

Mean Anomaly (M)

Value

315.21567

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.091202

1-sigma variation

Unit

Aphelion distance

Value

3.692811

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.709040

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.073240

1-sigma variation

Unit

MOID

Value

0.073230

1-sigma variation

Unit

Orbit Period

Value

1351.2696

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.52498E-16	1.63504E-17	1.55686E-14	-2.01121E-15	7.51718E-14	-1.48341E-13
e	1.63504E-17	4.87994E-17	-6.26544E-15	2.13558E-14	-1.86158E-14	-1.24663E-14
i	1.55686E-14	-6.26544E-15	2.70667E-11	-1.29019E-11	2.08710E-11	-1.52203E-11
Ω	-2.01121E-15	2.13558E-14	-1.29019E-11	6.40587E-11	-5.77312E-11	1.74926E-12
ω	7.51718E-14	-1.86158E-14	2.08710E-11	-5.77312E-11	1.18054E-10	-7.64999E-11
M	-1.48341E-13	-1.24663E-14	-1.52203E-11	1.74926E-12	-7.64999E-11	1.45092E-10

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

3.115

Unit

Source

[4]

[5]

Quality

Value

3,B,U

Unit

Source

[5]

[4]

Amplitude

Value

0.45

Unit

mag

Source

[5]

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]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.104

Unit

mag

Source

[6]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[7]

Diameter

Value

1000 - 2300*

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.87

0.49

Unit

B-V

V-R

Source

[8]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[9]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	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)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Pravec, P.; Wolf, M.; Sarounova, L. (2011) http://www.asu.cas.cz/~ppravec/neo.htm
[5]	EARN	1.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	Estimation	Estimated from absolute magnitude
[8]	EARN	1.) Betzler, A.S.; Novaes, A.B.; Santos, A.C.P; Sobral, E.G; et al. (2012) Minor Planet Bul. 39, 5-8. (PHOTOMETRIC OBSERVATIONS OF 596 SCHEILA,1990 BG, 1990 TG1, 1999 CU3, 2000 DM8, 2001 PT9,2001 SN263, 2002 NP1, 2002 JP9, 2003 UV11, 2006 AL8,2008 SR1, 2009 BH81, 2009 QC, P/2010 A2 (LINEAR),2010 JK33, 2010 LY63, 2010 RF12, 2010 UD, P/2010 R2(LA SAGRA), 2010 YS, 2011 AN16, AND 2011 EZ78)
[9]	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

5100

Unit

Source

[1]

Unobserved

Value

236

Unit

Source

[1]

Normalized RMS of residuals

Value

0.369743

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2011-03-15.45942

Unit

Source

[2]

Last Observation

Value

2025-03-01.273373

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

729 (3)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2011-07-09

Unit

Source

[3]

Last Observation

Value

2011-07-09

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

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 451397 2011EZ78 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	2011-07-10 11:48	< 1 s	0.0957518	0.0957517	0.0000000
EARTH	2100-07-14 12:36	< 1 min	0.0818787	0.0818766	0.0000007

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
0.07406858	187.56432322	0.07539226	MINIMUM
359.80428537	7.08160588	2.07532217	SADDLE
179.93817272	7.25658042	2.70887791	SADDLE
179.96100956	187.26730618	4.70882209	MAXIMUM

Download:

MOID Plots

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