The star database in Starry Night is
actually a compilation of databases: Starry
Night Enthusiast uses the Hipparcos
catalogue, and the Tycho-2 catalogue, and
Starry Night Pro and Pro Plus also include
the USNO-A2 catalogue.
The Hipparcos and Tycho-2 catalogues
come from a European Space Agency
project to determine the distance to our
nearest stars. The Hipparcos catalogue has
about 100 000 stars and the Tycho-2
catalogue has about two million. Find out
more about these catalogues on their
official web page: http://astro.estec.esa.nl/
SA-general/Projects/Hipparcos/
hipparcos.html
Starry Night Pro and Pro Plus use the
USNO-A2 star database for dim stars not
included in the Hipparcos or Tycho
catalogues. About 75 million stars as dim
as 15th magnitude can be accessed. These
82 Starry Night User’s Guide
stars will only be visible if you chose the
“Full Install” or the “Custom Install”
options when you installed Starry Night.
The entire USNO-A2 star database
contains 500 million stars! This database
is far too large to fit on a CD or DVD, so
Starry Night allows you to download
portions of this database from the Internet.
See “Adding Objects 3 (Stars)” on
page 169 for more information.
Meg ezt:
Limit by Distance/Magnitude: These
options let you set up Starry Night to
display only those stars whose distance
from Earth or whose apparent magnitude
(brightness) fall within a certain range.
One use of this function would be to
identify which bright stars are within 100
light years (for example) of Earth.
42 Starry Night User’s Guide
In Starry Night Pro and Pro Plus, clicking
the words “Limit by Distance” in the
Options pane opens a dialog box that lets
you set numeric values for limiting by
distance or magnitude.
De ha adsz egy e-mail címet elküldöm az egész manualt, abban benne van minden.
