天王星 ALPO-Japan Latest
Uranus Image 2019/08/31(UT)
This was an average good night for observation of uranus
with calm moments through the 235mm cassegrain.
470 and 412x magnifications were used with profit with a period of worst seeing
that helps me to draw the patterns collected at the eyepieces and filter.
At 2H00UT time, the seeing was at its best allowing me to draw uranus:
a fuzzy polar cap that seemed to be circled by a darker ring bordered by a brighter band relatively
then the temperate band, where at limb a darker section of the ring on the band was highligted
then a thin equatorial bordering
then a dark hemisphere band.
At 2H25UT the seeing was degraded relatively, magnification reduced with the use of the W8 filter,
helped me to recover the initial observation except the dark section in the temperate band.
At 2H15UT, a degraded period occured with 5-6/10 images only.
The sketch is given for comparison: a clear polar cap unfeatured,
then the temperate band then the dark band on the other hemisphere.
This pattern recalled what it was captured with a smaller aperture, 5-6".
Most of the the first level features were washed by the seeing sometimes present.
Difficult to say more about,
except the fact that the overall contrast levels observed were at a lower status
than the status noted on july.
[Stanislas Maksymowicz Ecquevilly,France]