Harvard-Smithsonian CfA

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Observatory codes

Harvard-Smithsonian Center for Astrophysics






Citation on page 22438 in Brian G. Marsden, Gareth V. Williams, eds., Circulars, Harvard-Smithsonian Astrophysical Observatory, Minor Planet Center, at Cambridge, Mass., M.P.C. 22433-22518, September 1, 1993                                                 

Longitudes measured in degrees eastward from Greenwich, the parallax constants as the product of the geocentric distance (in earth equatorial radii) and the cosine and sine, respectively, of the geocentric latitude.

86 pages,  PDF,  754 KB          ISSN: 0736-6884


Related subjects

Measurements of Physical Properties, Data Analysis, Error Analysis, Minor Planets, Comets, Astrometry, Stellar catalogues, Astrography, Harvard-Smithsonian Center for Astrophysics, Minor Planet Center, IAU, parallax constants




Harvard-Smithsonian Center for Astrophysics












Harvard-Smithsonian Centre for Astrophysics








Observatory codes

Citation on page 16644 in Brian G. Marsden, Gareth V. Williams, eds., Circulars, Harvard-Smithsonian Astrophysical Observatory, Minor Planet Center, at Cambridge, Mass., M.P.C. 16637-16764, August 6, 1990                                         

Longitudes measured in degrees eastward from Greenwich, the parallax constants as the product of the geocentric distance (in earth equatorial radii) and the cosine and sine, respectively, of the geocentric latitude.

128 pages,  PDF,  319 KB          ISSN: 0736-6884


Related subjects

Measurements of Physical Properties, Data Analysis, Error Analysis, Minor Planets, Comets, Astrometry, Stellar catalogues, Astrography, Harvard-Smithsonian Center for Astrophysics, Minor Planet Center, IAU, parallax constants




Observatory codes

Citation on page 19356 in Brian G. Marsden, Gareth V. Williams, eds., Circulars, Harvard-Smithsonian Astrophysical Observatory, Minor Planet Center, at Cambridge, Mass., M.P.C. 19347-19558, January 19, 1992                                                 

Longitudes measured in degrees eastward from Greenwich, the parallax constants as the product of the geocentric distance (in earth equatorial radii) and the cosine and sine, respectively, of the geocentric latitude.

212 pages,  PDF,  512 KB          ISSN: 0736-6884


Related subjects

Measurements of Physical Properties, Data Analysis, Error Analysis, Minor Planets, Comets, Astrometry, Stellar catalogues, Astrography, Harvard-Smithsonian Center for Astrophysics, Minor Planet Center, IAU, parallax constants




Other citations:









An occultation occurs when an asteroid or comet passes in front of a more distant object, as an example a star, partially or totally hiding the more distant object.   Each occultation can be seen only at the right time and from a limited part of the Earth. Asteroids and comets pass in front of stars, as viewed from Earth, at night from time to time, casting a moving shadow onto the surface of the Earth. The perpendicular cross-section of the shadow is the exact size of the asteroid and thus can be used to measure the shapes and sizes of the asteroid. The more observers of the occultation event, the more accurate is the representation of the asteroid.   Thus, the prediction of the location of the shadow paths across or near populated areas is vital to getting observers positioned:

  • along, across large arcs of the Earth's surface; 
  • above and below the path, to obtain different chords, accounting for prediction errors.

The image on right side side simulates what is happening between the star and the asteroid, as seen by the Earth.  International Occultation and Timing Association, Inc. (IOTA), incorporated in the state of Texas, USA, identifies and measure coordinates of all observatories from which these events might be observed, since more observed chords give better resolution of the asteroid's shape.  IOTA publishes the Journal of Occultation Astronomy, ISSN 0737-6766.



IOTA Site List

International Occultation and Timing Association









Citation on page 60 in J. Hart, Site List, International Occultation and Timing Association, January 18, 1996 also available online in html format at: http://www.anomalies.com/iotaweb/index.htm

Combined Stations from AA, MPC, Pfile, Graze and Regular formatted files, sorted by longitude.  Longitudes measured in degrees eastward from Greenwich, the parallax constants as the product of the geocentric distance (in earth equatorial radii) and the cosine and sine, respectively, of the geocentric latitude.                                              

91 pages,  PDF,  324 KB         


Related subjects

Measurements of Physical Properties, Data Analysis, Error Analysis, Minor Planets, Astrometry, Asteroidal occultations, Harvard-Smithsonian Center for Astrophysics, Minor Planet Center, IOTA


                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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