During its first year, TESS will observe the Southern Hemisphere sky; each 24[degrees] x 24[degrees] field of view will overlap on the ecliptic pole
. TESS will then switch to the Northern Hemisphere sky for its second year.
Hasinger and his colleagues studied a different set of deep-space images, centered on the north ecliptic pole
. The German team did not use a ground-based telescope to determine the quasar status of the numerous X-ray sources in these images.
and a handful of strong phosphorescence hung in mid-flight on that sky's north shoulder." The comet was in the long, twisting body of Draco, which wraps around the North Ecliptic Pole
, near which glows NGC 6543, the wonderful 9th-magnitude Cat's Eye Nebula.
In addition, the atlas includes measurements of 599 Cepheid stars (43 newly discovered) and 2,595 RR Lyrae stars (343 new) around the south ecliptic pole
. These variable stars are vital to calculating the cosmic distance scale.
Penned by the remarkable British polymath Erasmus Darwin, these lines direct us to the sky's north ecliptic pole
, enwrapped in the great bend of Draco that starts behind the Dragon's head.
First, let's agree what we mean by "retrograde." If you were to look down on the solar system from the north ecliptic pole
in Draco, you'd see the major planets circling the Sun counterclockwise.
Uranus's "north star" happens to be Eta ([eta]) Ophiuchi, which is about 82[degrees] from the north ecliptic pole
on the sky.
Models incorporating versions of the Tusi couple appeared in later Byzantine manuscripts, and Copernicus made use of its principles when discussing variations in precession (the motion of the Earth's axis around the ecliptic pole
), determining ecliptic latitudes for the planets, and describing Mercury's orbit.
Very close to the north ecliptic pole
is NGC 6543, the famous Cat's Eye Nebula, a good object for amateur telescopes and quite spectacular in images returned from the Hubble Space Telescope.
Because it is bright and located within 15[degree sign] of the south ecliptic pole
, it is a handy navigational reference for astronauts and space probes.
Hence we see the north celestial pole, which is currently located close to Polaris, swing across the stars in a wide loop around the north ecliptic pole
every 26,000 years.
These coordinates are related to the ecliptic and the north ecliptic pole
(the solar system's north pole).