Mercury Messenger Probe Flips Sunshade Towards The Sun

June 23, 2006
Messenger Spacecraft
This artist's impression shows NASA´s Mercury-bound MESSENGER from the sunshade side. The sunshade shields the spacecraft's instruments from heat and solar radiation. Image Credit: Johns Hopkins University Applied Physics Laboratory

The Messenger spacecraft performed its final "flip" maneuver for the mission on June 21. Responding to commands sent from the Messenger Mission Operations Center at The Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md., through NASA's Deep Space Network antenna station near Goldstone, Calif., the spacecraft rotated 180 degrees, pointing its sunshade toward the Sun.

The 16-minute maneuver, designed to keep Messenger operating at safe temperatures as it moves closer to the Sun, wrapped up at 9:34 a.m. EDT, with successful reacquisition of signal from Messenger's front-side antenna.

The spacecraft was 196.5 million kilometers (122.1 million miles) from Earth and 144.6 million kilometers (89.8 million miles) from the Sun when the maneuver occurred.

Messenger had been flying with its back to the Sun since a March 8 "flop," allowing it to maintain temperatures within safe operating ranges at Sun distances greater than 0.95 astronomical units (1 AU is Earth's distance from the Sun).

Mission plans call for the spacecraft to keep its sunshade facing the Sun for the remainder of its cruise and science orbital operations around Mercury.

"Initial indications look very good" says Messenger Mission Operations Manager Mark Holdridge, of APL. "Spacecraft temperatures are coming down as expected and all systems and instruments are nominal."

The team will now turn its attention to preparing for the first Venus flyby on October 24. "We have mission simulations and flight tests coming up to test particular operations that will have to occur during the Venus flyby," Holdridge says.

"There will be a 57-minute solar eclipse during the October operation, so we will so be testing the flight systems in the flyby configuration to verify they will behave properly during the eclipse period."

On August 11, for instance, the team will conduct a flight test of the new autonomy that will power off components prior to the solar eclipse, allow the battery to discharge by approximately the same amount as during the real eclipse, and then power on components again once the battery is recharged, all in a more controlled setting with real-time visibility. This test will be combined with a battery reconditioning.

Later in August and through September, during the approach to Venus, Messenger's navigation team will use the Mercury Dual Imaging System cameras onboard the spacecraft to take a series of optical navigation pictures.

These images are not required for the Venus flyby but will be used by the Messenger navigation team for calibration and as practice for the optical navigation imaging to be utilized at Mercury.

Mercury Science: From Mariner 10 to Messenger

It takes hard work and the dedication of scores of individuals to make Messenger run smoothly — and through the remainder of the mission we'll introduce you to the Instrument, Engineering and Science Team members who make this mission happen.

First up is Robert G. Strom, a founder of modern planetary geology, an expert in surface morphology, and the only person on the Messenger team to have also served on the first mission to Mercury, Mariner 10.

As a member of the Science Team's Geology Group, he will lead the analysis of Mercury's geologic history and participate in the analysis of Mercury Atmospheric and Surface Composition Spectrometer spectral measurements of the surface.

Source: Johns Hopkins University Applied Physics Laboratory

Explore further: Mercury found to be tectonically active

Related Stories

Mercury found to be tectonically active

September 26, 2016

Images acquired by NASA's MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft show geologic features that indicate Mercury is likely still contracting today, joining Earth as a tectonically ...

Shrinking Mercury is all it's cracked up to be

October 3, 2016

Amid all the crashing onto comets and planning trips to Mars, you may be forgiven for missing a wonderful scientific result from NASA: the discovery that tiny Mercury joins Earth as the only other tectonically active rocky ...

MESSENGER team releases first global map of mercury

December 15, 2009

(PhysOrg.com) -- NASA's MESSENGER mission team and cartographic experts from the U. S. Geological Survey have created a critical tool for planning the first orbital observations of the planet Mercury - a global mosaic of ...

Recommended for you

Hubble catches a transformation in the Virgo constellation

December 9, 2016

The constellation of Virgo (The Virgin) is especially rich in galaxies, due in part to the presence of a massive and gravitationally-bound collection of over 1300 galaxies called the Virgo Cluster. One particular member of ...

Khatyrka meteorite found to have third quasicrystal

December 9, 2016

(Phys.org)—A small team of researchers from the U.S. and Italy has found evidence of a naturally formed quasicrystal in a sample obtained from the Khatyrka meteorite. In their paper published in the journal Scientific Reports, ...

Scientists sweep stodgy stature from Saturn's C ring

December 9, 2016

As a cosmic dust magnet, Saturn's C ring gives away its youth. Once thought formed in an older, primordial era, the ring may be but a mere babe – less than 100 million years old, according to Cornell-led astronomers in ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.