(updated 2012-Dec-23 UT)

 

Results of past JEE events

Site under heavy and continuous construction! Please check back soon for more processed results.

Modeling the Jovian dust field, moon atmospheres, and Io’s Torus, and flux tubes through Jovian Extinction Events (JEE)

 

 

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Brief description of reduction information:

 

Ephemeris for the Jovian system is acquired through the JPL Solar System Dynamics Group, Horizons On-Line Ephemeris System (http://ssd.jpl.nasa.gov/horizons.cgi) rendering exact relative positions of the Jovian System. Horizon’s provides the X, Y offset from Jupiter’s center giving a mutual reference point for all four major moons at any given time UT as viewed from earth. To determine the distance in arc seconds between Io (I), Europa (II), Ganymede (III), or Callisto (IV) a pair of moons are taken one at a time and a hypotenuse calculation is perform as such (example here for I and II):

 

SQRT((XI - XII)^2+(YI - YII)^2)

 

The answer to this would be the true separation in arc seconds of Io and Europa. Horizons also provides the angular diameter of each moon at that reference point of time. Knowing the diameter means one can plot an exact representation of moon separations simulating an atmosphere of a specified radii. Horizons provides Range data, i.e. the distance the moon is from earth, so one can determine which moon is in front causing extinction.

 

We originally based all predictions on published data of expected atmospheric radii for Io and Europa. For Io, Schneider et al. (1991) estimated Io’s atmosphere to extend to about 6 Io radii. Brown et al. (1996) estimated Europa’s atmosphere to extend to 25 Europa radii. Our original efforts IAEP2009 and JEE2010 mainly acquired data focusing on events where Io was in front causing extinction to the moon behind it. We found on average that Io’s extinctive part of its atmosphere at the equator to be about 8 Io radii, but very asymmetrical depending on the angle you view it. We have measured material pushed ahead of Io out to 31 Io radii. But for reduction purposes you will find on some of the lightcurves both the IAEP2009 or JEE2010 derived atmospheres as well as the published 6 Io radii and 25 Europa radii values. Then we provide a current fit for that event where we tell the JPL ephemeris to trace out a radius that fits most of the lightcurve data points.

 

Additional prediction information can be found here: http://scottysmightymini.com/JEE/JEE2012_FAQ.htm

 

 

 

(Additional information on how to interpret results is after the table)

 

UT Date

Event

Observer name, location, affiliation

(Click for lightcurve)

comment

Type

20090803

IoJ

D. Parker, ALPO, FL USA

Io transit of Jupiter

 

IAEP2009

20090807

IeII IoII

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

IMCCE Phemu09 report filed

D. Clark, IOTA, Humble ISD Observatory, TX USA

First discovery of Io extinction detection.

20090821

IoII

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20090823

IeIII

D. Clark, IOTA, Humble ISD Observatory, TX USA

20090901

IoII

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

* Inverted Lightcurve image *

IMCCE Phemu09 report filed

Confirmation LC of Io extinction detection.

B. Timerson, IOTA, NY USA

A. Scheck, IOTA, MD USA

20090905

IoII

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20090905

IeII

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20090916

IoII

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

B. Timerson, IOTA, NY USA

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

IMCCE Phemu09 report filed

20090923

IeII

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

20090923

IoII

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

14"

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

80mm

20090928

IIoIII

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

A. Scheck, IOTA, MD USA

20091024

IIIoII

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

IMCCE Phemu09 report filed

D. Clark, IOTA, Humble ISD Observatory, TX USA

20091025

IeII

D. Clark, IOTA, Humble ISD Observatory, TX USA

S. Degenhardt, TN USA

D. Clark, IOTA, Humble ISD Observatory, TX USA

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

20091030

IIIoI

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

20091031

IIIoII

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

data no good, clouded out

20091101

IoII

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

IMCCE Phemu09 report filed

D. Clark, IOTA, Humble ISD Observatory, TX USA

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

20091105

JeI

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

IMCCE Phemu09 report filed

20091105

IIoI

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

IMCCE Phemu09 report filed

20091113

IIoI

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

IMCCE Phemu09 report filed

First discovery of Europa  extinction detection.

20091117

IIoIII

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

A. Scheck, IOTA, MD USA

A. Scheck, IOTA, MD USA

20091125

IoII

A. Scheck, IOTA, MD USA

20091203

IoII

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

M. Hoskinson, IOTA, Edmonton, Canada

IMCCE Phemu09 report filed

S. Aguirre, IOTA, Hermosillo, Sonora, Mexico

IMCCE Phemu09 report filed

20091215

IIoI

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

no reference moon, clouds

20091224

IoII

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

* Inverted lightcurve image *

20100104

IoII

M. Hoskinson, IOTA, Edmonton, Canada

IMCCE Phemu09 report filed

 

 

JEE2010

(many events missing from JEE2010 table and will be updated soon)

20100106

IIxIII

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

20100117

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

simulated mutual event

20100425

TeXI

T. Redding, Redding Observatory South, IOTA, AAVSO FL USA

20101101

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

* Inverted lightcurve image *

First fit of Io Torus tip transit

 

JEE2012

(data still pending, these plots are preliminary and will be added to and modified, so check back)

 

20120721

IIxI

M. Miller, AAVSO, TX USA

20120725

IIxI IIxI TwXI

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

A. Scheck, IOTA, MD USA

D. Trowbridge, Tinyblue Observatory, AAVSO, WA USA

Triple JEE, first discovery of ability to detect Europa’s flux tube.

20120801

IIxI

D. Trowbridge, Tinyblue Observatory, AAVSO, WA USA

20120804

IIxI

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

A. Scheck, IOTA, MD USA

D. Trowbridge, Tinyblue Observatory, AAVSO, WA USA

Repeat of flux tube anomaly in LC.

20120808

TwxI

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

Confirmation that the Torus tip JEE is detectable while Io’s orbit is inclined 3 degrees

20120811

IIxI

S. Degenhardt, IOTA, AAVSO, SAS, TN USA

M. Miller, AAVSO, TX USA

A. Scheck, IOTA, MD USA

D. Trowbridge, Tinyblue Observatory, AAVSO, WA USA

Important miss

20120825

IIuIII

B. Giacchini, REA, CEAMIG, Belo Horizonte, Minas Gerais, Brazil

Third flux tube confirmation, 31 Europa radii distance

20120829

TwxI

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20120921

TexI

Bernd Gährken, Munich, Germany

Our first long term eastern Torus Tip. Shows possible double minima. Imaged in methane band showing less mag loss compared to unfiltered.

20120922

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20120925

M. Miller, AAVSO, TX USA

20121003

D. Trowbridge, Tinyblue Observatory, AAVSO, WA USA

20121005

TwxI

Bernd Gährken, Munich, Germany

Imaged in methane band showing less mag loss compared to unfiltered.

20121006

IuIII

Bernd Gährken, Germany

Potential first Io flux tube measurement.

20121009

D. Trowbridge, Tinyblue Observatory, AAVSO, WA USA

20121010

D. Trowbridge, Tinyblue Observatory, AAVSO, WA USA

20121030

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20121031

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20121105

M. Miller, AAVSO, TX USA

20121108

TwXI

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20121110

IxII

E. Iverson, IOTA, TX USA

A. Scheck, IOTA, MD USA

20121117

IxII

E. Iverson, IOTA, TX USA

M. Miller, AAVSO, TX USA

A. Scheck, IOTA, MD USA

20121120

IxIV

B. Timerson, IOTA, NY USA

20121121

IIxI

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20121123

IxII

B. Timerson, IOTA, NY USA

20121130

IIxI

B. Young, Werner Schmidt Observatory (I06), MA USA

20121208

IxII

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20121209

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20121211

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

20121213

TwXI

J. Talbot, RASNZ Occultation Section, Waikanae Beach, NZ

B. Timerson, IOTA, NY USA

20121221

E. Iverson, IOTA, TX USA

JEE2013

(data still pending, these plots are preliminary and will be added to and modified, so check back)

 

 

Standard Nomenclature:

 

Dates and times are UT

 

“Event type” = (A) B (C)

 

Where:

 

A = object in front

 

B = event, where:

        e = eclipse

        o = occultation

        x = dimming by atmospheric extinction

        u = dimming by flux tube

 

C = object in back

 

Objects:

 

        J = Jupiter

        I = Io

        II = Europa

        III = Ganymede

        IV = Callisto

        Te = Eastern tip of the Torus of Io

        Tw = Western tip of the Torus of Io

 

 

JEE FAQ:  http://scottysmightymini.com/JEE/JEE2012_FAQ.htm

 

 

25 Europa radii atmosphere:

Discovery of an extended sodium atmosphere around Europa

 Brown, Michael E. et al. Nature 380, 229 - 231 (21 March 1996); doi:10.1038/380229a0

 

6 Io radii atmosphere:

The structure of Io's corona

Schneider et al. (1991), Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 298-315.

 

 

Degenhardt, S. et. al (2010), Io and Europa Atmosphere Detection through Jovian Mutual Events, The Society for Astronomical Science: Proceedings for the 29th Annual Symposium on Telescope Science, p. 91-100  http://scottysmightymini.com/JEE/SAS2010_Io_Europa_Degenhardt.pdf

 

 

Jovian Extinction Event Predictions:

 

Scott Degenhardt  June 15, 2012

Send data correspondence to scotty@scottysmightymini.com

http://scottysmightymini.com/JEE/

Predictions package:  http://scottysmightymini.com/JEE/JEE2012_Jun_Aug.zip

Ephemeris Source:

 

        http://ssd.jpl.nasa.gov/horizons.cgi

 

Solar System Dynamics Group, Horizons On-Line Ephemeris System

     4800 Oak Grove Drive, Jet Propulsion Laboratory

     Pasadena, CA  91109   USA

     Information: http://ssd.jpl.nasa.gov/

     Connect    : telnet://ssd.jpl.nasa.gov:6775  (via browser)

                  telnet ssd.jpl.nasa.gov 6775    (via command-line)

     Author     : Jon.Giorgini@jpl.nasa.gov

Jovian Moon Configuration Graphic:

 

        Guide 8 by Bill Gray

        http://www.projectpluto.com/

 

Other Modeling tools:

 

        Starry Night 2007

Orion Special Edition

https://support.simulationcurriculum.com/home

http://www.telescope.com/

 

        Microsoft Excel

 

        The IAEP team and data from that study:

 

Scott Degenhardt, S. Aguirre, M. Hoskinson, A. Scheck, B. Timerson

International Occultation Timing Association (IOTA)

 

D. Clark

Administaff/Humble ISD Observatory

 

T. Redding

IOTA, Redding Observatory South

 

J. Talbot

RASNZ Occultation Section

 

 


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