and ansre are absolute and relative error tolerances for the solution x, respectively, supplied by the user.
As further evidence, he noted that at the shorter wavelengths the space between the planet and the inner edge of C in the rings' ansae
("handles") appeared slightly brighter than the background sky just outside ring A --though he warned that "this luminosity is much too feeble to show in the prints." Wood, a cautious man, made no announcement about his tentative discovery.
but again only average values are given in this table.
In my 24-inch, two detached ghostly "polar caps," or ansae
, can be glimpsed 1' northwest and southeast of the central star.
From views he and Friedrich August Theodor Winnecke (1835-1897) obtained with the 14.9 inch (37.9cm) Merz and Mahler refractor at Pulkovo Observatory, Otto Struve (1819-1905) came to the conclusion that certain aspects they had observed at the ansae
, which he termed appendices lumineux, were independent of the ansae
it has ansae
, which probably indicate a surrounding nebulous ring seen edgeways."
In deep images, NGC 6886 resembles the planet Saturn, but even with my 15-inch reflector at high power, I can't see the ansae
that elongate it southeast-northwest.
Oddly, the two ends (ansae
) of the ring system sometimes appear to differ slightly in color.
Despite a modest reduction in image brightness, the crepe ring is visible at a glance in the ansae
of the rings through all of the dielectric filters; the denser Wratten 12 filter doesn't fare as well in this respect.
Positions of any dusky patches or subdivisions on the extremities (ansae
) of the rings.
So was the Cassini Division (at the rings' "tips," or ansae
, where it is most conspicuous).
Over the years only a handful of observers have made it a point to routinely examine Saturn's rings through color filters, but there are a few simultaneous sightings of the phenomenon, invariably at the ansae
of the rings (from the Latin for "handles"; the extremities of the major axis of the ellipse seen by earthbound observers).