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The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies. The directions perpendicular to the galactic plane point to the galactic poles . In actual usage, the terms galactic plane and galactic poles usually refer specifically to the plane and poles of the Milky Way , in which Planet Earth is located.
Galactic latitude is positive towards the north galactic pole, with a plane passing through the Sun and parallel to the galactic equator being 0°, whilst the poles are ±90°. [3] Based on this definition, the galactic poles and equator can be found from spherical trigonometry and can be precessed to other epochs; see the table.
The galactic coordinate system uses the approximate plane of the Milky Way Galaxy as its fundamental plane. The Solar System is still the center of the coordinate system, and the zero point is defined as the direction towards the Galactic Center. Galactic latitude resembles the elevation above the galactic plane and galactic longitude ...
The origin essentially coincides with the Earth, because the supergalactic plane is identified as a plane observed from Earth. The north supergalactic pole (SGB = 90°) lies in the constellation Hercules at galactic coordinates (l z = 47.37°, b z = +6.32°), or approximately RA = 18.9 h, Dec = +15.7°.
The galactic plane is inclined at an angle of 31° ± 7° to the line of sight to the Earth and the long axis is oriented along a position angle of 219° ± 4°. [4] The northwest side of the galaxy is more strongly obscured by dust, suggesting it is the near side. [12]
It is inclined at an angle of 25° to the plane of the sky, appearing nearly face-on. [10] Based on the size of the Einstein ring, this galaxy has a mass of about 10 11 M ☉, which is comparable to the Milky Way. [4] An independent analysis of the same imaging data suggested the possible presence of a main-sequence star within 0.5″ of the ...
Along with GRS 1915+105, GRO J1655−40 is one of at least two galactic "microquasars" that may provide a link between the supermassive black holes generally believed to power extragalactic quasars and more local accreting black hole systems. In particular, both display the radio jets characteristic of many active galactic nuclei.
The galactic plane of this galaxy is inclined at an angle of 78° ± 3° to the plane of the sky, [4] with the major axis of its oval profile being aligned along a position angle of 121°. [10] The morphological classification of NGC 6502 is SAB:(s)bc.
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