Explorer 43: Difference between revisions

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U.S. satellite part of the Explorers program
m Date formats per MOS:DATETIES
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{{Use mdy dates|date=October 2018}}
{{Infobox spaceflight
{{Infobox spaceflight
| name = Explorer 43
| name = Explorer 43
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| mission_type = [[Space]] physics
| mission_type = [[Space]] physics
| operator = [[NASA]]
| operator = [[NASA]]
| COSPAR_ID = 1971-019A<ref name="nssdc">{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1971-019A|title=IMP-I|work=NSSDC Master Catalog|publisher=NASA Goddard Space Flight Center|accessdate=19 June 2018}} {{PD-notice}}</ref>
| COSPAR_ID = 1971-019A<ref name="nssdc">{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1971-019A|title=IMP-I|work=NSSDC Master Catalog|publisher=NASA Goddard Space Flight Center|accessdate=June 19, 2018}} {{PD-notice}}</ref>
| SATCAT = 5043<ref name="n2yo"/>
| SATCAT = 5043<ref name="n2yo"/>
| mission_duration = 3 {{1/2}} years
| mission_duration = 3 {{1/2}} years
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| power =
| power =


| launch_date = {{start-date|13 March 1971, 16:15}}&nbsp;UTC<ref name="jonathan">{{cite web|url=http://www.planet4589.org/space/log/launchlog.txt|title=Launch Log|work=Jonathan's Space Page|first=Jonathan|last=McDowell|accessdate=19 June 2018}}</ref>
| launch_date = {{start-date|March 13, 1971, 16:15}}&nbsp;UTC<ref name="jonathan">{{cite web|url=http://www.planet4589.org/space/log/launchlog.txt|title=Launch Log|work=Jonathan's Space Page|first=Jonathan|last=McDowell|accessdate=June 19, 2018}}</ref>
| launch_rocket = [[Delta (rocket family)|Delta M6]] 562/D83<ref name="jonathan"/>
| launch_rocket = [[Delta (rocket family)|Delta M6]] 562/D83<ref name="jonathan"/>
| launch_site = [[Cape Canaveral Air Force Station|Cape Canaveral]] [[Cape Canaveral Air Force Station Launch Complex 17|LC-17A]]<ref name="jonathan"/>
| launch_site = [[Cape Canaveral Air Force Station|Cape Canaveral]] [[Cape Canaveral Air Force Station Launch Complex 17|LC-17A]]<ref name="jonathan"/>


| last_contact =
| last_contact =
| decay_date = {{end-date|2 October 1974}}<ref name="n2yo">{{cite web|title=EXPLORER 43 (IMP-6)|url=http://www.n2yo.com/satellite/?s=5043|publisher=n2yo.com|date=2011|accessdate=June 19, 2018}}</ref>
| decay_date = {{end-date|October 2, 1974}}<ref name="n2yo">{{cite web|title=EXPLORER 43 (IMP-6)|url=http://www.n2yo.com/satellite/?s=5043|publisher=n2yo.com|date=2011|accessdate=June 19, 2018}}</ref>


| orbit_epoch = 13 March 1971<ref name="nssdc"/>
| orbit_epoch = March 13, 1971<ref name="nssdc"/>
| orbit_reference = [[geocentric orbit|Geocentric]]
| orbit_reference = [[geocentric orbit|Geocentric]]
| orbit_regime = [[Highly elliptical orbit|Highly Elliptical]]
| orbit_regime = [[Highly elliptical orbit|Highly Elliptical]]
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| next_mission = [[Explorer 44]]
| next_mission = [[Explorer 44]]
}}
}}
'''Explorer 43''', also called as '''IMP-I''' and '''IMP 6''', was a [[United States|U.S.]] [[satellite]] launched as part of [[Explorers program]]. Explorer 43 as launched on 13 March 1971 on [[Cape Canaveral Air Force Station|Cape Canaveral]], with an [[Delta rocket]]. Explorer 43 was the sixth satellite of the [[Interplanetary Monitoring Platform]].<ref name="astronautix"/><ref name="nssdc"/>
'''Explorer 43''', also called as '''IMP-I''' and '''IMP 6''', was a [[United States|U.S.]] [[satellite]] launched as part of [[Explorers program]]. Explorer 43 as launched on March 13, 1971 on [[Cape Canaveral Air Force Station|Cape Canaveral]], with an [[Delta rocket]]. Explorer 43 was the sixth satellite of the [[Interplanetary Monitoring Platform]].<ref name="astronautix"/><ref name="nssdc"/>


==Spacecraft and mission==
==Spacecraft and mission==
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A [[radioastronomy]] experiment was also included in the spacecraft payload. The 16-sided spacecraft was {{convert|182.12|cm}} high by {{convert|135.64|cm}} in diameter. The spacecraft spin axis was normal to the [[ecliptic plane]], and its spin rate was 5 [[rpm]], with propulsion '''Star-17A'''. The initial apogee point lay near the earth-sun line. The solar-cell and chemical-battery powered spacecraft carried 2 transmitters. One continuously transmitted PCM encoder data at a 1,600 [[Bits per second|bps]] information bit rate.
A [[radioastronomy]] experiment was also included in the spacecraft payload. The 16-sided spacecraft was {{convert|182.12|cm}} high by {{convert|135.64|cm}} in diameter. The spacecraft spin axis was normal to the [[ecliptic plane]], and its spin rate was 5 [[rpm]], with propulsion '''Star-17A'''. The initial apogee point lay near the earth-sun line. The solar-cell and chemical-battery powered spacecraft carried 2 transmitters. One continuously transmitted PCM encoder data at a 1,600 [[Bits per second|bps]] information bit rate.


The second transmitter was used for transmission of [[VLF]] data and for ranging information. Three orthogonal pairs of [[dipole]] [[antenna (radio)|antenna]]s were used for the [[electric field]]s experiments, and one of these pairs was also used for the radioastronomy experiment. The members of the antenna pair along the spacecraft spin axis extended {{convert|2.9|m}}, the members of the pair used in both the electric field and radio astronomy experiments extended {{convert|45.5|m}}, and the members of the third pair were slightly unbalanced, extending {{convert|24.4|x|27.6|m}}, respectively. All four elements perpendicular to the spin axis were to have extended {{convert|45.5|m|ft}}.
The second transmitter was used for transmission of [[VLF]] data and for ranging information. Three orthogonal pairs of [[dipole]] [[antenna (radio)|antenna]]s were used for the [[electric field]]s experiments, and one of these pairs was also used for the radioastronomy experiment. The members of the antenna pair along the spacecraft spin axis extended {{convert|2.9|m|abbr=on}}, the members of the pair used in both the electric field and radio astronomy experiments extended {{convert|45.5|m|abbr=on}}, and the members of the third pair were slightly unbalanced, extending {{convert|24.4|x|27.6|m|abbr=on}}, respectively. All four elements perpendicular to the spin axis were to have extended {{convert|45.5|m|ft|abbr=on}}.


The spacecraft reentered the earth's atmosphere 2 October 1974, after a highly successful mission.<ref name="nssdc"/><ref name="astronautix">{{cite web|url=http://www.astronautix.com/craft/imp.htm|title=IMP|work=Encyclopedia Astronautica|first=Mark|last=Wade|date=2011|accessdate=June 19, 2018}}</ref>
The spacecraft reentered the earth's atmosphere October 2, 1974, after a highly successful mission.<ref name="nssdc"/><ref name="astronautix">{{cite web|url=http://www.astronautix.com/craft/imp.htm|title=IMP|work=Encyclopedia Astronautica|first=Mark|last=Wade|date=2011|accessdate=June 19, 2018}}</ref>


==References==
==References==

Revision as of 22:40, 3 October 2018

Explorer 43
250px
Explorer 43 in space.
Mission typeSpace physics
OperatorNASA
COSPAR ID1971-019A[1]
SATCAT no.5043[2]
Mission duration3 1⁄2 years
Spacecraft properties
ManufacturerGSFC
Launch mass635 kg (1,400 lb)
Start of mission
Launch dateMarch 13, 1971, 16:15 (1971-03-13UTC16:15) UTC[3]
RocketDelta M6 562/D83[3]
Launch siteCape Canaveral LC-17A[3]
End of mission
Decay dateOctober 2, 1974 (1974-10-03)[2]
Orbital parameters
Reference systemGeocentric
RegimeHighly Elliptical
Eccentricity0.93678[1]
Perigee altitude242 km (150 mi)[1]
Apogee altitude196,574 km (122,145 mi)[1]
Inclination28.7°[1]
Period5,626.0 minutes[1]
EpochMarch 13, 1971[1]
Instruments
 

Explorer 43, also called as IMP-I and IMP 6, was a U.S. satellite launched as part of Explorers program. Explorer 43 as launched on March 13, 1971 on Cape Canaveral, with an Delta rocket. Explorer 43 was the sixth satellite of the Interplanetary Monitoring Platform.[4][1]

Spacecraft and mission

Explorer 43 continued the study, begun by earlier IMPs, of the interplanetary and outer magnetospheric regions by measuring energetic particles, plasma, and electric and magnetic fields.

A radioastronomy experiment was also included in the spacecraft payload. The 16-sided spacecraft was 182.12 centimetres (71.70 in) high by 135.64 centimetres (53.40 in) in diameter. The spacecraft spin axis was normal to the ecliptic plane, and its spin rate was 5 rpm, with propulsion Star-17A. The initial apogee point lay near the earth-sun line. The solar-cell and chemical-battery powered spacecraft carried 2 transmitters. One continuously transmitted PCM encoder data at a 1,600 bps information bit rate.

The second transmitter was used for transmission of VLF data and for ranging information. Three orthogonal pairs of dipole antennas were used for the electric fields experiments, and one of these pairs was also used for the radioastronomy experiment. The members of the antenna pair along the spacecraft spin axis extended 2.9 m (9 ft 6 in), the members of the pair used in both the electric field and radio astronomy experiments extended 45.5 m (149 ft), and the members of the third pair were slightly unbalanced, extending 24.4 m × 27.6 m (80 ft × 91 ft), respectively. All four elements perpendicular to the spin axis were to have extended 45.5 m (149 ft).

The spacecraft reentered the earth's atmosphere October 2, 1974, after a highly successful mission.[1][4]

References

  1. ^ a b c d e f g h i "IMP-I". NSSDC Master Catalog. NASA Goddard Space Flight Center. Retrieved June 19, 2018. Public Domain This article incorporates text from this source, which is in the public domain.
  2. ^ a b "EXPLORER 43 (IMP-6)". n2yo.com. 2011. Retrieved June 19, 2018.
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved June 19, 2018.
  4. ^ a b Wade, Mark (2011). "IMP". Encyclopedia Astronautica. Retrieved June 19, 2018.
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