Explorer 49

Explorer 33
Jiné názvyRAE-B (Radio Astronomy Explorer)
COSPAR1973-039A
Katalogové číslo6686
Start10. června 1973
KosmodromCape Canaveral LC 17B
Nosná raketaDelta 1913
Typ oběžné dráhySelenocentrická
Stav objektuneaktivní, nesledován
ProvozovatelNASA
Druhvědecká sonda
ProgramProgram Explorer
Hmotnost328 kg
Parametry dráhy
Epocha1973-06-15
Centrální tělesoMěsíc
Aposelenium1063,8 km
Periselenium1053 km
Sklon dráhy55,7°
Doba oběhu221 minut
Některá data mohou pocházet z datové položky.

Explorer 49 byla vědecká družice Měsíce, vyslaná agenturou NASA v roce 1973. V katalogu COSPAR dostala označení 1973-039A.[1]

Úkol mise

Instalace aerodynamických krytů kolem Exploreru 49

Sonda měla provést měření parametrů vzdálenějšího vesmírného prostoru poblíž Měsíce, zejména galaktický a sluneční rádiový šum na velmi malých frekvencích.

Základní údaje

Váha sondy byla 334 kg.[1]

Označení Lunar v některých publikacích měla kvůli zvolené orbitě kolem Měsíce[1], označení Explorer bylo dáváno programu vědeckých družic v USA. Další známé družice této řady jsou neúspěšná Explorer 33 a úspěšná Explorer 35. Její pracovní označení bylo RAE 2 (Radio Astronomy Explorer), protože podobný typ družice byl uveden do provozu s označením RAE 1 pět let předtím.

Průběh mise

Sonda s raketou odstartovala 10. června 1973 a byla navedena na protáhlou oběžnou dráhu kolem Země ve výši 183 až 390 244 km. Když o pět dní později míjela při prvním průletu Měsíc, za pomocí motoru na pevné palivo změnila svou dráhu na orbitu kolem Měsíce. Ta měla periodu 241,29 minut ve výši 1120 až 1331 km. Další korekce se uskutečnila 26. června, což sondu posunulo na téměř kruhovou orbitu ve výšce 1053 – 1064 km . Stabilizace letu byla prováděna rotací kolem své osy. Ta se postupně zmenšovala z původních 12 na 0,25 otáček za minutu. Na této dráze pak rozvinula své dvě antény s velmi dlouhými rameny 228 metrů, pomocí kterých pak zahájila svůj program měření.

Odkazy

Reference

  1. ↑ a b c VÍTEK, Antonín; LÁLA, Petr. Malá encyklopedie kosmonautiky. Praha: Mladá fronta, 1982. Kapitola Americké sondy, s. 261. 

Externí odkazy

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