土星 ALPO-Japan Latest
Saturn Image 2015/05/13(UT)
Trevor Barry,Constantin Sprianu,Milika-Nicholas
Imaged Saturn May 13th,seeing was effected by the jet stream to various degrees but have a few data sets from the session.
Trevor Barry(406mm Newtonian)|
[Trevor Barry:Broken Hill:Australia]
Teruaki Kumamori (280mm SC)|
≪大阪府堺市 熊森照明≫[Teruaki Kumamori:Ohsaka Japan]
Constantin Sprianu(245mm Cassegrain)|
This is Saturn in average seeing and (very) low altitude (26 degrees).
Even with the ADC is hard to make good images without very good seeing.
Seeing 5/10,Transparency 8/10
Milika-Nicholas (355mm SCT)|
We noted what we termed a large "rift" or "disturbance" in one of Saturn's
Northern bands in the area from 60°N to 67°N at L1 = 183° L2 = 260° L3 =
266° (approximate) in these images.
Although we do not think that it had been reported upon before (we notified
BAA & PVOL) we then examined ALPO images from other contributors from
earlier dates & were able to ascertain that this feature had been in
existence for some time, albeit slightly different in appearance & often
somewhat obscure...some imagers referring to it as a "dark spot."
At the time it appeared like a "notch" in the darker more northerly
band/belt adjacent to the lighter more southerly band/belt ( which we
interpret as the NNTeZ & NNTeB)
The iR742nm images displays the greatest contrast as would be expected
although the r & r animation as well as the rgb define it better for that
Subsequent images show this feature evolving rapidly & changing in
appearance to what looks like a dark spot with a proceeding longitudinal
disturbance or "wake."