When.com Web Search

Search results

  1. Results From The WOW.Com Content Network
  2. Bellatrix - Wikipedia

    en.wikipedia.org/wiki/Bellatrix

    Bellatrix is the third-brightest star in the constellation of Orion, positioned 5° west of the red supergiant Betelgeuse (Alpha Orionis). It has the Bayer designation γ Orionis , which is Latinized to Gamma Orionis .

  3. Sh 2-264 - Wikipedia

    en.wikipedia.org/wiki/Sh_2-264

    Betelgeuse and Bellatrix are south-east and south-west of the formation, forever cast as Alpha and Gamma by Bayer, they are near the top of Orion and in myth represent the hunter's shoulders. Sharpless 264 , also known as the Lambda Orionis Ring , is a molecular cloud and H II region , which can be seen in the northern region of the Orion ...

  4. International Celestial Reference System and its realizations

    en.wikipedia.org/wiki/International_Celestial...

    A reference frame has been defined as "a catalogue of the adopted coordinates of a set of reference objects that serves to define, or realize, a particular coordinate frame". [7] A reference system is a broader concept, encompassing "the totality of procedures, models and constants that are required for the use of one or more reference frames".

  5. List of stars for navigation - Wikipedia

    en.wikipedia.org/wiki/List_of_stars_for_navigation

    Positions on the celestial sphere are often expressed using two coordinates: declination and sidereal hour angle, which are similar to latitude and longitude on the surface of the Earth. To define declination, the Earth's equator is projected out to the celestial sphere to construct the celestial equator , and declination is measured in degrees ...

  6. List of observatory codes - Wikipedia

    en.wikipedia.org/wiki/List_of_observatory_codes

    Ceccano Observatory (Osservatorio Astronomico Bellatrix) La: Ceccano 471: Houstrup Observatory-Houstrup 472: Merlette Observatory: PACA: Merlette 473: Remanzacco Observatory: F: Remanzacco: 474: Mount John University Observatory (University of Canterbury Mount John Observatory; UCMJO), Ca: Mount John Observatory, Lake Tekapo: 475: Observatory ...

  7. Barycentric and geocentric celestial reference systems

    en.wikipedia.org/wiki/Barycentric_and_geocentric...

    The geocentric celestial reference system (GCRS), also created by the IAU in 2000, is a similar standard coordinate system used to specify the location and motions of near-Earth objects, such as satellites. [1] Its center of coordinates is the center of mass of the Earth.

  8. IC 2118 - Wikipedia

    en.wikipedia.org/wiki/IC_2118

    IC 2118 (also known as Witch Head Nebula due to its shape) is an extremely faint reflection nebula believed to be an ancient supernova remnant or gas cloud illuminated by nearby supergiant star Rigel in the constellation of Orion.

  9. NGC 2169 - Wikipedia

    en.wikipedia.org/wiki/NGC_2169

    Map showing the location of NGC 2169. NGC 2169 is an open cluster in the Orion constellation.It was possibly discovered by Giovanni Batista Hodierna before 1654 and discovered by William Herschel on October 15, 1784. [1]