Friday, March 18, 2011

Earth's Moon from MESSENGER

Image of Earth's moon from MESSENGER's Wide Angle Camera. The Moon's south pole, farside highlands, west Oceanus Procellarum and Mare Orientale are prominent [NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington].

Sarah Braden

LROC News System

The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft became the first spacecraft ever to enter Mercury's orbit! The insertion burn occurred 18 March 2011 at 12:45 am UTC (17 March, 8:45 EDT). The MESSENGER spacecraft traveled about 4.9 billion miles to reach the point for orbital insertion. Read more about the successful MESSENGER orbital insertion!

Today's Featured Image is the Moon as seen from the MESSENGER spacecraft on July 31, 2005, less than a year after the spacecraft's launch from Cape Canaveral. The lunar image was taken by the MESSENGER Wide Angle Camera (WAC), which is part of the Mercury Dual Imaging System (MDIS). At the time when the image was taken, the spacecraft was about 992,814 kilometers (616,906 miles) from the Earth.

This image was not taken simply because the Moon is beautiful and inspiring; it serves to help the MESSENGER team calibrate the camera and spectrometer. The Moon is a good calibration standard because its reflectance and color have been measured with many instruments, so it is useful to make comparisons between instruments with different characteristics. In other words, it is a check on the quality of the Earth-based calibration.

LROC is an important new contributor to our understanding of how light interacts with the lunar surface especially in ultraviolet wavelengths. In particular, the new WAC color images will help to calibrate the MESSENGER MASCS spectrometer, which measured the Moon at the same time the MDIS camera snapped this picture.

The MESSENGER MDIS view of the Moon is centered about -60°, 280°. Mare Orientale is the the small dark spot in the upper left. For a closeup of Orientale see the recent LROC Featured Image. The same viewpoint as the MESSENGER image was used to create a higher resolution view from the LROC WAC.

LROC Wide Angle Camera 400 meter/pixel orthographic projection, similar to the field of view captured from MESSENGER, July 31, 2005. View the full-sized contextual LROC WAC mosaic HERE [NASA/GSFC/Arizona State University].

After the orbital insertion, scientists will test the spacecraft systems to make sure that all the instruments are in good working order. It is important to verify that all the instruments operate well in the harsh thermal environment around Mercury (currently Mercury is only about 0.3 AU from the Sun!). On April 4, 2011, the science phase of the MESSENGER mission will begin and the orbital science data from Mercury will be returned to Earth almost every day for at least a year! For more news about the MESSENGER mission, visit the NASA news page.

Congratulations to the awesome MESSENGER spacecraft operations team at APL!

Check out the MESSENGER website to learn more about the mission goals!

1 comment:

Prasad said...

Great job. We should appreciate them