April 13, 2009 - Constant Satellite, Ephemeral Lake

Constant Satellite, Ephemeral Lake Landsat 7, the latest member of the Landsat program, was launched ten years ago this week. The Landsat program, managed jointly by NASA and the U.S. Geological Survey, began in 1972 as the Earth Resources Technology Satellite program, and it represents the longest high-resolution multispectral record of Earth’s continental surfaces as seen from space. Landsat 7’s imager is the Enhanced Thematic Mapper Plus, which measures solar radiation reflected from Earth’s surface in eight different wavelengths. This stunning false-color image of Lake Carnegie in Western Australia was taken in Landsat 7’s first year of service. Lake Carnegie fills with water only during periods of significant rainfall; during dry years, the lake is reduced to a muddy marsh.

Image credit:  USGS National Center for EROS and NASA Landsat Project Science Office

Weekly Calendar

April 13-19, 2009

Holidays - Sky Events - Space History

Monday 13

Easter Monday (Canada)

Antares 0.4° south of Moon

Tuesday 14

1629: Christiaan Huygens born
1972: KSC and Vandenberg AFB picked as shuttle launch sites
2005: Expedition 11 crew launched to International Space Station

Wednesday 15

Mars 0.5° south of Uranus
Venus appears stationary

1999: Landsat 7 launched

Thursday 16

Moon at apogee

1867: Wilbur Wright born
: First captured V2 rocket launched from White Sands, NM
1965: First test-firing of Saturn V rocket first stage (S-IC)
1972: Apollo 16 launched

Friday 17

Last Quarter Moon 9:36 am
Ceres appears stationary

1967: Surveyor 3 launched
1969: First X-24A lifting body glide test
1970: Apollo 13 crew returns to Earth
1998: STS-90 Columbia launched

Saturday 18

Venus 6° north of Mars

Sunday 19

Jupiter 2° south of Moon
Neptune 2° south of Moon

1967: Surveyor 3 lands on Moon
1971: Salyut 1 launched, first space station. 
1982: Salyut 7 launched
1993: 200th Soviet / Russian spacewalk
2001: STS-100 Endeavour launched

Suggestions for new history dates or better links? Corrections for errors on this page? Please e-mail me.