north celestial pole Point on the celestial sphere directly above the Earth's north pole.
North Celestial Pole - The point above the Earth's north pole where the Earth's polar axis, if extended outward into space, would intersect the celestial sphere.
North Celestial Pole (NCP)
A direction determined by the projection of the Earth's North Pole onto the celestial sphere. It corresponds to a declination of +90 degrees. The North Star, Polaris, sits roughly at the NCP.
Observable Universe ...
The north celestial pole currently has nearly the same coordinates as the bright star Polaris (which is Latin for "Pole Star").
The north celestial pole is the "hub" of the northern sky. All the stars appear to rotate around this hub.
north celestial pole (NCP): projection of the Earth's north pole onto the sky. The NCP altitude = the observer's northern latitude. nova an object that greatly increases in brightness rapidly, so it appears as a ``new star''.
celestial pole Either of the two points of intersection of the celestial sphere and the extended axis of the earth, labeled N or S to indicate whether the north celestial pole or the south celestial pole.
north polar sequence (NASA SP-7, 1965) A list of stars near the north celestial pole arranged in order of photographic magnitude, used as reference stars in stellar photometry.
At just under a degree from the true North Celestial Pole, HR 286 has the additional distinction of vying for "number 2 pole star," as it is almost exactly at the same angular separation from the Pole as the other candidate, Lambda Ursae Minoris.
The most common direction of motion in the solar system, both for orbital revolution and axial rotation, is from west to east (counterclockwise as seen from the north celestial pole); ...
The seven stars of the Big Dipper have inspired many stories, perhaps because they are bright and located so near the north celestial pole, around which the stars rotate during the course of the night. But not everyone calls it a Dipper.
Wait a second, isn't 80º N just 10º away from the North Celestial pole? Yes, 90-10=80. Okay, so the object is 10° from the North Star, Polaris. That's fine. Now here's the tricky bit - how can you be sure of which side of Polaris the object is at?
Alderamin lies close to the precessional path of the north celestial pole, so that it periodically comes within 3° of being an exact pole star - a status it last held in about 18,000 BC and will hold again about 5,500 years from now.
In the northern hemisphere, the star closest to the North Celestial Pole is Polaris, α Ursae Minoris, the Pole star, whose equatorial coordinates are α:02h 31m 49.08s, δ +89° 15' 50.8'' (J2000).
Similarly, a Dec of +90 degrees points to the "North Celestial Pole" and -90 degrees points to the "South Celestial Pole." The word Celestial is used to distinguish between, for example, the North Pole in the sky and the North Pole on the Earth.
Tombaugh continued his search another 13 years, and examined the sky from the north celestial pole to 50° south declination, down to magnitude 16-17, sometimes even 18.
(See More Precisely 1-1 for a discussion of angular measure.) Thus, the celestial equator is at a declination of 0°, the north celestial pole is at +90°, ...
Two stars in Ursa Major called Dubhe and Merak are popularly termed the Pointers because a line drawn through them points to the north celestial pole.
The Earth's rotation axis happens to be pointing almost exactly at Polaris now, but in 13,000 years the precession of the rotation axis will mean that the bright star Vega in the constellation Lyra will be approximately at the North Celestial Pole, ...
We get this number by subtracting the sun's declination-23º 27'-from the north celestial pole-90º, which is a point in space the Earth's axis points to.
Today, the north celestial pole points to within just 1 of the arc of Polaris. It will point closest to Polaris in AD 2017. In 12,000 years the north celestial pole will point about 5 from Vega.
This is the star that is nearest to the North Celestial Pole. If you stood at the north pole, Polaris would be almost directly overhead. If you can spot Polaris in the sky, you can always tell which way is north.
The constellation itself is rather indistinct with few bright stars, but it is a large and rambling construction wrapped around the north celestial pole.
From the picture, we can see that those stars near the north celestial pole never set. We call them circumpolar stars. One of the circumpolar star, called Polaris, is special because it is very near the north celestial pole.
Spence looked for pairs of bright stars within 15° of the north celestial pole.
This small and faint galaxy happens to lay close to North Celestial Pole (see finder chart below) - in 1830s NCP was located within the area covered by the above tiny CCD field! PGC36268 galaxy (16 mag.) is also located nearby.
The 6th brightest star, it is closer to the north celestial pole than any other really bright star (Polaris is quite dim by comparison) and is nearly always above the horizon for latitudes in North America.
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Rigel ...
klimata: (pron. clim-arta) part of an astrolabe, it is a disk rotating on the mater with the north celestial pole in the centre and showing almucantar lines for the design location.
He catalogued 120,000 stars (from the north celestial pole to 15° S declination), noting 3,112 binary stars, most of which were previously unknown.
Precession & Changing North Celestial Pole Illustration
Precession Lecture Notes by Professor O'Connell
Press Releases -- NASA ...
In this image, North (the direction towards the North Celestial Pole) is up and East is left, and the white line is the rotational axis of Altair. The black grid shows lines of latitude and longitude in an Altair-centric coordinate system.
NGC 188 is an extremely old globular cluster near the north celestial pole that consists of about 150 stars. It was first discovered by John Herschel in 1825. The cluster is believed to have formed 10-20 billion years ago.
Viewing Polaris will always let you know which way is north. At the north celestial pole, Polaris will be almost directly overhead so it's also known as the Pole star.
Polaris
The star nearest the north celestial pole, also known as the North Star. It is a common misconception that the North Star is the brightest in the sky.
The North Star is current Polaris (right ascension , declination ) since it is closest to the north celestial pole. However, due to precession of the equinoxes, the pole rotates through the sky with a period of about 26,000 years.
Equatorial A mounting for a telescope that has two, mutually perpendicular axes of rotation, one of which can be pointed to the north celestial pole.
The point at which the meridian intersects the horizon below the North Celestial Pole. [H76]
North America Nebula
An emission nebula (NGC 7000) in Cygnus. [H76] ...
Polaris is the brightest star in the constellation Ursa Minor. It is very close to the north celestial pole , making it the current northern pole star....
from there.
We do know that about 5,000 years ago, around the time the Great Pyramid at Giza and Stonehenge were being constructed, the Earth's north pole pointed near the star Thuban, in Draco. 2000 years ago, the north celestial pole will have been some 12 ...
The projection of the north geographic pole onto the celestial sphere gives the north celestial pole.
See also South Pole ...
Our current name for the star, Polaris, is Latin and abbreviation for Stella Polaris, "The Pole Star." The name reflects the position of the star near the north celestial pole.
c. Imagine the earth's north and south pole projected out onto the sphere. These would be called the north celestial pole and the south celestial pole respectively.
At the present time in Earth's 26,000 year precession cycle, a bright star happens to be very close, less than a degree, from the north celestial pole. This star is called Polaris, or the North Star.
Finding latitude with the Pole Star
Imagine yourself standing at night at point P on Earth and observing the pole star (or better, the position of the north celestial pole, near that star), at an elevation angle h above the horizon.
Info: Polaris, the brightest star of Ursa Minor, is the North Star or Pole Star, the star closest to the north celestial pole.
Vela (Sails, formerly Argo Navis)
No Saint given ...
Polar Alignment - Making the polar axis of an equatorial mount parallel to the Earth's axis of rotation by pointing it accurately at the North Celestial Pole in the Northern Hemisphere, or the South Celestial Pole in the Southern Hemisphere.
visible from most latitudes in the Northern hemisphere, Crux is a modern constellation and has no Greek or Roman myths associated with it. Crux was used by explorers of the southern hemisphere to point south since, unlike the north celestial pole, ...
a celestial object's location by using the angular distance north or south of the celestial equator. Similar to a latitude designation on the planet Earth. It is measured from -90o at the south celestial pole to +90o at the north celestial pole.
The shape of the telescope dome prevents the telescope from observing below about 20 degrees above the horizon, while the north pier of the mount obscures the region of the sky around the North Celestial Pole.
At night more than 1000 visible stars followed a similar course, appearing to rotate in permanent groupings, called constellations, around a fixed point in the sky, which is known as the north celestial pole.
Dec) of the celestial equator the object lies, and is directly analogous to the latitude coordinate here on Earth. Stars on the celestial equator have Dec=0o, stars at the south celestial pole have Dec=-90o, and stars at the north celestial pole have ...
This point is +90° if you are watching the North Celestial Pole or âˆ'90° if you are observing the Southern Celestial Pole. The concentric circles the stars trace out are lines of celestial latitude, known as declination.
Continuing his journey towards the south, the north celestial pole sinks below the horizon; the south celestial pole rises above it; or to speak more exactly, the zenith of the observer approaches that pole.
part (15:24:55.8+58:57:57.8, ICRS 2000.0) of Constellation Draco (see chart and photo), the Dragon -- west of Theta Draconis, southeast of Thuban (Alpha Draconis), and south of the Big Dipper (or Plough). Edasich was Earth's North Celestial Pole Star ...
the plane of the orbit from the asceding node to "perihelion" (the point in the orbit at which the stars are closest together) is , the argument of periastron. The angle between the ascending node and the direction towards the north celestial pole ...
 See also: Celestial Pole, Star, Earth, Sky, Degree
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