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Jupiter (Planet, est. mag -2.7, est. to be in Capricornus, Est. RaDec 2134-1521)
Observer: Lew Gramer 77 Magoun Ave. Medford, MA 02155 (e-mail: dedalus@latrade.com, web: http://www.tiac.net/users/lewkaren)
Instrument: 20-inch Dobsonian reflector Location: Savoy, MA, USA
Light pollution: none Transparency: excellent Seeing: good
Time: Sun Jul 6 08:06:00 1997 UT Obs. no.: 216
Central Meridian assumed to be 229o (System I).Yellow (#K2) filter used for all observations, except color estimates, which were clear-eyepiece.At 630x: NEB ochre-reddish, twice as wide as SEB - which appears SINGLE and reddish-brown. EB visible across entire disk, and is darkest near W limb (longitude 150o in System I). A disturbance is apparent in NEB, about 1/3 of way from meridian to W limb (200o). NPR at this high power is hazy, and shows no detail! SPR however is very distinct and brownish, with a hint of orange mottling.At 420x: STB separates itself visually from SPR intermittently, especially at the meridian (230o). NTB and NNTB are now distinct from the NPR haze. NTB clear, about 1/3 of the width noted for NEB. NNTB only intermittent, and about 1/2 width of NTB (or 1/6 width of NEB). Dark BROWN spot just S of STB, 1/3 of way from meridian to E limb (260o). Dark and light orange mottling apparent on W limb (140 to 160o), BOTH N of NNTB and between NNTB and NTB. Disturbance also apparent from STB Nward to the equator, 1/4 to 1/3 of way from meridian to W limb (210o to 200o). Nearby Io to E looked BRIGHT yellow, even without the K5 filter!
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