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Connecting Web Services
Welcome to our web site dedicated to filter profile related VO
services developed at the Johns Hopkins University.
On these pages you will find tools and tutorials on how to access
the profiles of most of the well-known astronomical instruments.
The passband database contains the profiles of almost 100 photometric filters
of several instruments including the largest and most recent ones such as the
SDSS, HST, etc. The list is easily also expandable, anyone can post additional
filter profiles using a web form or automatically using a client program to the
The filter profile catalog can be searched by keyword and by advanced query
options including effective wavelength and UCD. The results may be overplotted
on each other for easy comparison of photometric systems or between different
versions. Give it a try now.
This website is intended to provide an easy to use interface to access the
catalog. All the basic tasks can be done on the forms. Filter
profiles may be downloaded in several standard formats such as plain
ascii, XML and VOTable.
Every tool published on these pages may be also accessed programmatically via
XML Web Services. We recommend you try the VO way and test drive our
webservices and take advantage of them to automate (for example) the upload of
large amount of filter profiles. Read the tutorial here to get started. For
more details visit http://msdn.microsoft.com/webservices/ and
The website is 770 pixels wide. To print on a Letter or A/4 size sheet, you
should set the printing margins on both sides to 0.4 inch or 1 cm in Internet
Explorer or Netscape Navigator. Check print preview before wasting paper!
You can query the database and use webservices without being a
registered user. If you want to post your own filter profiles to the
database, please use the register link on the top of the page to get
your username, password and WebServiceId (required for using the webservices