?IoRI...ODAM. Day 0 = Launch Day (i9 June 1963) Labeled consecutively with each vehicular crossing...

163
TIROS VII ATTITUDE SUMMARY 9G20"-9 (ORBITS 8000 -11850) VOLUME TIT p ADRIENNE ZENUK ARACON GEOPHYSICS CO. CONCORD, MASSACHUSETTS A DIVISION OF ALLIED RESEARCH ASSOCIATES, IN_ ?IoRI DECEMBER 1965 THIRD TECHNICAL SUMMARY REPORT UNDER ,,,_=T=^r-r _n N&.q _-9_47 _%,011 II ir_ll,,iv i =we _'T.'."_. - w- ,_ - N66 -19506 (ACCESSION NUMBER} (THRU) o / 7_ / ( AGES) (CODE) (NASA CR OR TMX OR AD NUMBER) (CATEGORY) GPO PRICE $ CFSTI PRICE(S) $ Hard copy (HC) Microfiche (M F) NATIONAL AERONAUTICS AND _ ff 653 July 65 O000ARI) SPACE FLIGHT CENTER AERONOMY AND METEOROLOGY DIVISION GREENIIBELT, MARYLAND

Transcript of ?IoRI...ODAM. Day 0 = Launch Day (i9 June 1963) Labeled consecutively with each vehicular crossing...

  • TIROS VII ATTITUDE SUMMARY

    9G20"-9

    (ORBITS 8000 -11850)

    VOLUME TIT

    p

    ADRIENNE ZENUK

    ARACON GEOPHYSICS CO.

    CONCORD, MASSACHUSETTS

    A DIVISION OF ALLIED RESEARCH ASSOCIATES, IN_

    ?IoRI

    DECEMBER 1965

    THIRD TECHNICAL SUMMARY REPORT

    UNDER

    ,,,_=T=^r-r _n N&.q _-9_47_%,011 II ir_ll,,iv i =we _'T.'."_. - w- ,_ -

    N66 -19506(ACCESSION NUMBER} (THRU)

    o / 7_ /( AGES) (CODE)

    (NASA CR OR TMX OR AD NUMBER) (CATEGORY)

    GPO PRICE $

    CFSTI PRICE(S) $

    Hard copy (HC)

    Microfiche (M F)

    NATIONAL AERONAUTICS AND _ ff 653 July65

    O000ARI) SPACE FLIGHT CENTER

    AERONOMY AND METEOROLOGY DIVISION

    GREENIIBELT,MARYLAND

  • t

    9G20,-9

    TIROS VII ATTITUDE SUMMARY

    (ORBITS 8000 - 11850)

    VOLUME TIT

    ADRIENNE ZENUK

    ARACON GEOPHYSICS CO.

    CONCORD. MASSACHUSETTS

    A DIVISION OF ALLIED RESEARCH ASSOCIATES1 INC.

    DECEMBER 1965

    THIRD TECHNICAL SUMMARY REPORT

    UNDER

    CONTRACT NO. NAS 5-954"/'

    NATIONAL AERONAUTICS AND SPACE ADMINISTRATION

    GODDARD SPACE FLIGHT CENTER

    AERONOMY AND METEOROLOGY DIVISION

    GREENBELT1 MARYLAND

  • 4

    TABLE OF CONTENTS

    SECTION 1

    SECTION Z

    APPENDIX A

    APPENDIX B

    REFERENCES

    INTRODUCTION

    GRAPHICAL PRESENTATION OF DATA

    OPERATIONAL DEFINITIVE ATTITUDE DATA

    T AB U LAT IONS

    TIROS VII SUBPOINT TRACK

    Page

    1

    3

    9

    159

    163

    LIST OF ILLUSTRATIONS

    Figure No.

    Z-I

    2-2

    TIROS VII Operational Definitive Attitude

    Parameters (no , to)

    TIROS VII Operational Definitive AttitudeParameters (R.A., Dec.)

    TIROS VII Attitude Parameters (no ,to) at 1Z00 UT

    TIROS VII Subpoint Track

    4

    8

    161

    LIST OF TABLES

    Table No.

    A-I

    A-Z

    B-I

    ODA Table Headers

    Operational Definitive Attitude Data

    Sample Orbital Elements

    I0

    12

    160

    ii

  • SECTION 1

    INTRODUCTION

    This report provides TIROS Vll operational Definitive Attitude Data for

    orbits 8000-11850, covering the periodll December 1964 to Z9 August 1965. Because

    of the extended lifetime of TIROS VII, considerably more attitude data are available

    than from previous TIROS satellites. Consequently, it has become necessary to

    publish these data in separate volumes. Similar data for the first 8000 orbits of#

    TIROS VII were presented in Volumes I and II of this seriea.

    It was the responsibility of ARACON Geophysics Company during the TIROS

    VII operations to provide definitive and predictive attitude on satellite spin-axis

    {camera) orientation. Attitude determinations were made by ARACON personnel at

    the Data Acquisition Stations as rapidly as possible and compiled daily in the form

    of an Operational Definitive Attitude Message (ODAM) for teletype transmission to

    the various users. This report summarizes the daily ODAM transmissions in

    graphical and tabular form.

    Volume I and Appendix A of Reference l provide detailed descriptions of

    the sources and procedures used in derivation of the attitude data presented in this

    report.

    This report represents the final volume of the TIROS VII data to be published

    by ARACON Geophysics Company. Effective i September 1965, this function is to be

    assumed by the NASA.

    * Goldshlak, L. and A. Zenuk, 1965: TIROS VII Attitude Summary, Volume I,

    Fifth Technical Summary Report under Contract No. NAS 5-1204, ARACON

    Geophysics Company, Concord, Massachusetts

    Zenuk, A., 1 965: TIROS VH Attitude Summary, Volume I_I, Second Technical

    Summary Report under Contract No. NAS 5-9547, ARACON Geophysics Company,Concord, Massachusetts

  • SECTION 2

    GRAPHICAL PRESENTATION OF DATA

    The data contained in the daily ODAM transmissions were compiled and

    are presented in this section in graphical form. Figure 2-I shows the progress

    of no (dashed) and to (solid) plotted against orbit number. Figure 2-2 presents

    the attitude data in celestial coordinates (right ascension and declination) plotted

    against orbit number.

    In both figures, the solid vertical lines indicate changes in the Magnetic

    Attitude Control (MAC) Switch position; Z the actual switch position is indicated in

    Roman numerals near the top of the diagram. Dashed vertical lines show satellite

    spinup. Precise orbit numbers during which MAC switch changes and spinups

    occurred may be obtained from Table A-Z.

    vs. t These parameters are plotted for eachFigure 2-3 is a graph of n o o"

    Julian Day (labeled every fifth day) at 1200 UT for Julian Days 541 through 801.

    * n is the minimum nadir angle of the satellite camera axis during an orbit;

    to i° the time in minutes, after ascending node, at which n o occurs.

  • 4

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    8

  • APPENDIX A

    OPERATIONAL DEFINITIVE ATTITUDE

    DATA TABULATIONS

    A. 1 NOMENCLATURE

    This appendix contains the Operational Definitive Attitude (ODA) data as

    determined by ARACON Geophysics on-site personnel during orbits 8000-11 850 of

    the TIROS VII operational lifetime. No attempt has been made to apply smoothing

    techniques as a result of hindsight. These data were extracted from the ODAM

    which was issued daily during the useful lifetime of the satellite.

    Attitude data sources, reliability factors, and attitude determination

    techniques were discussed in Volume I of this series of reports {see Introduction).

    A word of explanation concerning nomenclature is offered here to potential

    users attempting to correlate data presented in these tables with TIROS film strips.

    Some of the documentary literature for TIROS television pictures use two orbit

    numbers for identifying a film strip (i.e., Ref. 3 and 4). As an example, an orbital

    designation for a film strip such as 91/90 or 91 R/0 90 or 90/91 indicates that

    pictures were taken during orbit number 90, stored on video tape in the satellite,

    and were then played back during orbit number 91. Whenever two orbit numbers

    identify a film strip, and the film strip is designated as "TAPE" mode, the lower

    orbit number should be used to locate corresponding attitude data. It is also

    possible to have pictures {DIRECT mode} on the film strip which were obtained

    during the higher stated orbit number - thus requiring two sets of attitude data for

    Errors caused by selecting attitude data for an orbit adjacent to a desired

    orbit will be neglibible for most purposes. However, selection of inappropriate

    ascending node data will cause marked descrepancies in location of picture images

    relative to the earth. Table A-I provides a brief explanation of the abbreviations

    appearing in the Header of the ODA table (A-g).

  • TABLE A-I

    ODA TABLE HEADERS

    Column

    a

    b

    c

    d

    g

    h

    Header

    DATE

    JU LIAN

    DAY

    iORBIT

    NUMBER

    ASCENDING

    !NODE

    to

    no

    RA SA

    DEC SA

    GAMMA

    Explanation

    Greenwich Mean date on which the

    ascending node of the orbit in column coccurred.

    System Day. Also J-Day on

    ODAM. Day 0 = Launch Day

    (i 9 June 1 963)

    Labeled consecutively with each

    vehicular crossing of the earth's

    equator from south to north. Launch

    and injection are considered to occuron orbit zero.

    Greenwich Mean Time and longitude

    at which the satellite crossed the

    equator from south to north.

    Attitude parameters in orbital coordinate

    system. Commonly referred to as TOT

    (time of occurrence of no) t and NON (theminimum nadir angle), stated in

    minutes after ascending node (Min AAN).

    Right ascension and declination of

    satellite spin axis. These values repre-sent the transformation of t and n into

    the celestial coordinate system, o

    Angle between spatial vectors of thesatellite spin axis and the satellite-sunline.

    10

  • A. 2 TIROS VII OPERATIONAL DEFINITIVE ATTITUDE DATA

    The ODA table (A-Z) is divided into two basic sections. Columns "a"

    through "d" contain data obtained directly from the NASA Computation Center via

    teletype during the TIROS VII operations. Columns "e" through "i" contain the

    "best-fit" attitude parameters determined on-site by ARACON Geophysics.

    The attitude data are presented in two coordinate systems: orbital (no, to)

    and celestial (right ascension and declination).

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