Jupiter: Recent Developments and Trends - The Association of Lunar
Transcript of Jupiter: Recent Developments and Trends - The Association of Lunar
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Jupiter: Recent Developments and Trends
Richard Schmude, Jr.Gordon College
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Overview
• Introduction• Oval BA and the GRS• NEB width• NEB ovals• Photoelectric Photometry
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Oval BA
• White color during mid 2005 and earlier
• Dec. 2005: slight brownish color (Einaga)
• Jan. 8 2006: brown color (Einaga)
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Oval BA
• Jan. 15, 22 2006: Red color (Einaga)
• Feb. 2, 2006: red color (Maxson)
• Feb. 2006: Chris Go brings the red color to our attention.
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Oval BA and the GRS
• Oval BA gained on the GRS at:– 0.45 degree/day: Jan-June 8– 0.15 degree/day: June 12-22– 0.45 degree/day June 23-July 1
• Oval BA will transit the GRS on July 18
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NEB changing width
• The width of the NEB has changed by about 25% over the past 5 years
• How does this affect other features on Jupiter?
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NEB width
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NEB white ovals
• Two ovals in the NEB merged in late June.
• These ovals are near 220°W longitude (system II)
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Photoelectric Photometry
• Measurement of brightness
• Factors that affect brightness– Jupiter-Sun distance– Jupiter-Earth distance– Phase angle– Clouds– Tilt ??????
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Geometric Albedo
• Fraction of light than an object reflects
• Coal: low albedo (~0.05)
• Fresh snow: high albedo (~0.8)
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Jupiter’s albedo
• Around 0.53
• Has not changed much since 1999
• 1999-2006 values similar to 1963-65 values
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Albedo and Jupiter’s tilt
• Center of Jupiter (from Earth) ranges from 4°S to 4°N
• Does this affect Jupiter’s albedo?
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Results
• Albedo = 0.534 – 0.00079 φ
where φ = the latitude of the center of Jupiter’s disc as seen from Earth
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Conclusions
• The color of oval BA changed in late 2005 and is now red
• Oval BA will pass the Great Red Spot (GRS) on about July 18, 2006
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Conclusions
• The North Equatorial Belt (NEB) periodically gets wide and thin
• Two NEB ovals may merge in July 2006
• Jupiter’s albedo has been almost constant since 1999; it may change slightly with tilt.