PDS_VERSION_ID       = PDS3 

RECORD_TYPE          = FIXED_LENGTH
RECORD_BYTES         = 80
OBJECT               = TEXT
 PUBLICATION_DATE    = 1996-06-27
 NOTE                = "Description of contents of CATALOG
                        directory "
END_OBJECT           = TEXT
END


      The CATALOG directory contains mission, host, instrument,
reference, personnel, and data set PDS catalog objects for
this archive volume.  The files follow the 'streamlined' format
adopted by the Planetary Data System (PDS) in late 1993 and
documented in the Planetary Data System Standards Reference
(Version 3.1, 3 August 1994; JPL D-7669, Part 2).

     Each catalog object is in ASCII, with a maximum of 78
characters per line.  Each line is delimited with a carriage-
return (ASCII 13) line-feed (ASCII 10) pair.

     The templates are:

COLLECT.CAT
     A description of the files forming this data collection.


MISSION.CAT

     A brief description of the Magellan mission.  It includes a
chronology of events, definition of mission phases, and science
objectives.


MGN_HOST.CAT

     A description of the Magellan spacecraft.


DSN_HOST.CAT

     A description of the Deep Space Network.


MGN_RSS.CAT

     An overview of the Magellan radio science subsystem
used in the radio occultation experiments from which these
data were obtained.


DSN_RSS.CAT

     An overview of the Deep Space Network radio science
subsystem used in the radio occultation experiments from
which these data were obtained.


MGN_ABS.CAT
MGN_RTPD.CAT

     A description of the data sets contained in the archival
volume.  These files include information on the primary data
types included in this archive.  Brief discussions of the quality
of the data are included where applicable.  The data sets in the
archive volume are:

  MGN_RTPD - This data set contains vertical profiles of 
             refractivity, temperature, pressure and density 
             in the neutral Venus atmosphere.

  MGN_ABS  - This data set contains vertical profiles of 13-cm
             and 3.6-cm absorptivity and abundance of sulfuric 
             acid vapor (H2SO4) in the neutral Venus atmosphere.


REFS.CAT

     A listing of references used elsewhere in the streamlined
templates and of references that might be generally useful in
working with these data.


PERS.CAT

     A listing of key people involved in analyzing the radio
occultation data and in producing the archival data set.