Monday, January 14, 2008


EDITED: And that's a wrap!

We had a perfect flyby!

A really deserved success to such a great team.
Just a final adenda I wasn't able to post yesterday due to lost of access to blogger.

It's from Mark Perry:
"Rui,The radio-science aspect of the flyby went as planned. We were able to lock onto the spacecraft's signal and begin 2-way Doppler measurements in less then two minutes after MESSENGER came out from around the planet. So, we have Doppler data during closest approach. It will take at least a few weeks to analyze the data and extract the small signals that represent the non-uniformity in Mercury's gravity field.
Just as important, the radio signal showed that the spacecraft was still operating normally. There were no telemetry signals on the data, but the RF signal, itself, would have been different if the spacecraft had entered a safe mode.So far, so good!
Mark"

Now, let me just thank the members of the MESSENGER team for their efforts to keep us informed and you all who participated with a great mood in this party.
May the data flow! :-)

MERCURY FLYBY1 PARTY
POST



Closer and closer...Today is flyby day!
Edited: There's video from images acquired between January 9 and 13

The MESSENGER spacecraft is now making its approach to Mercury and it will give our best regards and the announcement to our return to the planet at a distance of just 200kms…
To celebrate the occasion, and counting with the good will of some of the mission’s instruments scientists I have created this special post where interaction is the intended to be the key word…


How to participate?

Do you have a question? That’s even better…

If you click in the comments link below this lines you will be able to read updated information and curiosities straight from the mission’s HQ posted by some members of the team making this possible and you have the possiblity of writing there your own comments and questions regarding the event.


Noam Izenberg and Mark Perry, MASCS and Radio Science instrument scientists, and, time permitting (but highly unlikely...), Ralph McNutt, MESSENGER's Project Scientist and Louise Prockter, MDIS instrument scientist, spacEurope’s guests will start their collaboration today, the flyby day, but they’ll be around on Tuesday and Wednesday, the days where data starts arriving Mother Earth and where, as Noam Izenberg puts it "The _real_ fun begins"...

Remember, interaction is the word!

Go MESSENGER Go!

In the meanwhile, and as a way of inspiring our spacebased souls, a true spacEurope's friend, Nicholas Previsich, always present with his suggestions and critics, just sent me his impressions on the return to Mercury, let's read:

"MESSENGER- Filling In The Gap

"Hello. My name's Nick, and I've been a life-long space enthusiast, one of those 40-somethings that used to sit in my pajamas & watch early-morning Gemini launches way back in the day. My deepest thanks to Rui for this chance to step on the soapbox, and also congratulations for spacEurope's first year (...)!

In my earliest childhood, I was extremely impatient to see new worlds. I was dying to see the canals of Mars, the swamps of Venus, and the molten tin lakes of Mercury...and, of course, when we did finally see these places through our marvelous robots, things were far different then we'd thought. I was never disappointed with this, except for the fact that my inner child thought I'd be going there myself in the "Jetsons" worldview of the future that so many of us late Baby-Boomers took to heart as an expectation. Only recently have I realized how lucky I am, how lucky we all are.

MESSENGER will complete the reconnaissance of the inner planets of the Solar System. Consider that statement a moment, if you will. Fifty years ago--just fifty years ago--we as a species made our first tentative step into space with the launch of Sputnik I, and in just a few more years we will have complete maps of not only the terrestrial planets but also the major moons of Jupiter and Saturn. In fact, it is probable that we will have currently operational missions to all the classical planets of the ancients, with Dawn enroute to Ceres and Vesta (worlds in their own right) and New Horizons speeding to Pluto to boot.

Ptolemy, Galileo, Cassini, Columbus, and more--all our forbearers who yearned to see the next horizon or wondered what those moving points of light in the sky might be like--all would envy us today, for we see not the New World but dozens of them for the first time in human history. We are the fortunate ones after hundreds of generations to truly see new lands--and all in an historical blink of an eye.
I don't need my hovercraft, I don't need my robot maid; I'm more than content to see all of Mercury's surface before I die, to watch Titan slowly reveal its secrets, to watch Mars unveiled as a place of diverse wonders before my eyes, merely to name a few. To paraphrase the spacEurope slogan, we are indeed exploring space and seeding evolution, which is the realization of an ancient dream. They'll never be a time quite like this again, and we are beyond lucky to be here now.

NICHOLAS PREVISICH"

For more information regarding the flyby visit the mission's website.

23 comments:

Rui Borges said...

May the party begin! :-)

Gordan said...

Be sure to pass on our congrats to Louise for excellent imagery MDIS has provided up until now, Rui. We expect the _real_ stuff to be at least 10x more exciting!

Stu said...

Best wishes and good luck to everyone over at MESSENGER HQ, out here in "armchair explorer" land we're all rooting for you! You've shared great pics with us already, but I can't wait for the close encounter images. Calotis Basin has always fascinated me and I really am looking forward to seeing all of it for the first time!

I'll open the questions - someone has to be the first!

1. What's the atmosphere like over there in the "nerve centre"? Lots of coffee being drunk? Lots of nervous smiles?

2. Is there a "mission mascot" cuddly toy sitting on top of a monitor somewhere? (come on, admit it, every mission has one! ;-) )

3. How do you guys feel about the way the spaceflight enthusiast community - on such websites as unmannedspaceflight.com - has taken this mission to its heart, grabbing the approach images as soon as they appear and enhancing and manipulating them to bring out details?

Rui Borges said...

Gordan, welcome and thanks for visiting.
Let us hope that our dear Louise Prockter may read your words personally... ;-)

Stu, great intro questions! Let us hope for some answers.

Rui Borges said...

For the readers with questions focused on MDIS, Louise Prockter informed me that Noam and Mark can cover this very well...

I have a question myself, one for now...:
At around what time are we expecting telemetry data?

Rui Borges said...

As our guests are not here yet (remember they're living in a different time zone (EST)) it is time to tell in more detail who they are:
Noam Izenberg is the instrument scientist for Mercury Atmospheric and Surface Composition Spectrometer (MASCS)which is a spectrometer sensitive to light from the infrared to the ultraviolet and will measure the abundances of atmospheric gases, as well as detect minerals on the surface of Mercury.

Mark Perry is also instrument scientist but for Radio Science (RS), which will will use Doppler effect to measure very slight changes in the spacecraft's velocity as it orbits Mercury. This will allow scientists to study Mercury's mass distribution, including variations in the thickness of its crust.

If there's a chance Ralph McNutt may appear to say hi! He is the mission's Project Scientist and the the Principal Investigator's "right hand man" in assuring that the spacecraft, mission design, and experiment plan answer all six of the major science questions being investigated by the project.

It would be a pleasure to count with Louise Prockter but it will be hard to welcome here, Louise is instrument scientist for MDIS, Mercury Dual Imaging System.

Noam Izenberg said...

I just got in a few minutes ago after keeping abreast of last preparations over the weekend. As the OpNav images tell, everything is looking pretty good. MESSENGER communication is now on beacon only for flyby and executing the core command load. The approach imaging sequence is going on now, and the MASCS tailsweep begins in a few hours, thought data will not start coming down until the flyby is complete. The data starts coming down tomorrow, and will take a day or two to complete.

There is a science team meeting coming up soon - mostly preparation for the exciting time ahead, and it's a great, anticipatory feeling as people trickle in.

So far as I know, we don't have a mascot per se, though I think Hermes himself might be an appropriate fellow.

And speaking as a space enthusiast myself, I am very gratified and happy to see the attention that MESSENGER is getting from the community. It's been a long, long road, and there is still far to go. This first look is just that - a tantalizing tease of what the mission and Mercury have in store for us.

Rui Borges said...

Dear Noam

Let me welcome you in to this blog, home sweet home for all of us, space enthusiasts across the blue marble, and thank you for your availability to share what is going on there at MESSENGER's HQ.

Is it possible to have more detail regarding MASCS's tailsweep for now?

Cheers,

Rui.

PS: Louise told me that her office is just aside yours, please, send her our best regards.

Noam Izenberg said...

Sure, Rui,

A very diffuse and time varying stream of sodium atoms is blown away from Mercury by the solar wind. It has been observed telescopically from earth multiple times, including a campaign going on right now.

Understanding the origin and processes of this stream - the interaction of the surface materials, solar wind, and thin Mercury exosphere, is one of the goals of the MASCS instrument. When we're in orbit we'll be getting a real look at the near-Mercury environment, but the flybys give us a unique opportunity to look well "downwind" of the planet, and see how far the sodium tail extends, and possibly how it changes from flyby to flyby.

The operation itself can best be pictured by imagining a line extending from the center of the sun through Mercury. The sodium tail extends away from the planet roughly along this line. MESSENGER is approaching at an angle to this line, and the space craft is pivoting on its sun-facing axis to pass the field of view of MASCS up and down across this line, collecting the faint emission light of sodium atoms. The sweep pauses periodically for MDIS to take approach images, and then resumes. The sweep continues until MESSENGER passes into Mercury's shadow.

Stu said...

Thanks Noam, great explanation! I have to be honest and say I'm a "pictures person", and can't wait for the fly-by images to come in, but I do appreciate how important the hard science is and this certainly sounds like a fascinating study.

Unfortunately I'm heading out to work in half an hour, and won't get back until gone 10pm UK time so I'll miss all the realtime excitement of the fly-by later this evening, but I'm looking forward to catching up on all that's happened when I get back.

Rui Borges said...

Noam, that was clear as a picture...and good to know that flybys we'll permit not only to acquire occasional data but also to establish a record of possible changes...

Any news regarding the approach movie?

Mark Perry said...

Heading down ot the Mission Operations Center (MOC) in a few moments.

Most of the scientist are in the expanded Science Operations Center (SOC), which is in a different building than the MOC, which is where the spacecraft operators sit.

Starting to hectic.

More later,
Mark

Rui Borges said...

Mark!
Welcome to spacEurope's MESSENGER FLYBY1 PARTY!
This just wouldn't be the same without you... :-)

Expectation rising as you're heading there and time flies getting MESSENGER closer and closer to to Mercury!
Thank you for the keeping us informed during this exciting countdown to closest approach.

Could you please resume us what will happen regarding the Radio Science during the flyby?

Rui Borges said...

Time Until Closest Approach: 02:21:42 (hh:mm:ss)
Altitude: 48,612 km (30,206 mi)
Visible Surface Sunlit: 28.4%

Don't forget to check the Mission's Visualization Tool at:
http://messenger.jhuapl.edu/encounters/

Rui Borges said...

Time Until Closest Approach: 01:11:49 (hh:mm:ss)
Altitude: 23,946 km (14,879 mi)
Visible Surface Sunlit: 24.4%

Noam Izenberg said...

Sorry I haven't been back on. I'm in the "situation room" right now, next to Mission Ops. Mercury is now between MESSENGER and Earth, and close approach is less than half an hour away. The press is her, asking questions of everyone, and the atmosphere is pretty charged and anticipatory.

Wish you were here... ;-)

TheChemist said...

Closest approach should be in about 20 minutes. Let's hope everything goes ok. Ultreya!

Noam Izenberg said...

Closest approach has come and gone, spacecraft signal reacquired and radio science has lock. MASCS is taking surface data, MDIS is imaging, the laser has completed its ground track, and other instruments have all been active. Everything looks great so far!

Rui Borges said...

We wish we were there... ;-)

Time Since Closest Approach: 00:17:15 (hh:mm:ss)
Altitude: 4,629 km (2,876 mi)
Visible Surface Sunlit: 69.1%
NAC Resolution At Image Center: 135.70 m/pixel
WAC Resolution At Image Center: 949.92 m/pixel
Surface Coordinates At Image Center: 7.58 º S 149.63 º E

PS: Radio Science has lock? I hope everything is OK with Mark Perry ;-)

TheChemist said...

Well, it takes a spectroscopist to appreciate a good lock :-)
Way to go guys, looking forward to the first results in a couple of days !

Rui Borges said...

I believe there will be some people with some nice marmalade dreams tonight... :-)

Stu said...

Sounds like everything went really well today, congratulations to everyone there! Can't wait to see the first new pics! :-)

Rui Borges said...

We had a perfect flyby!
A really deserved success to such a great team.
Just a final adenda I wasn't able to post yesterday due to lost of access to blogger.
It's from Mark Perry:

"Rui,
The radio-science aspect of the flyby went as planned. We were able to lock onto the spacecraft's signal and begin 2-way Doppler measurements in less then two minutes after MESSENGER came out from around the planet. So, we have Doppler data during closest approach. It will take at least a few weeks to analyze the data and extract the small signals that represent the non-uniformity in Mercury's gravity field.

Just as important, the radio signal showed that the spacecraft was still operating normally. There were no telemetry signals on the data, but the RF signal, itself, would have been different if the spacecraft had entered a safe mode.

So far, so good!
Mark"

Now, let me just thank you all who participated with a great mood in this party and may the data flow! :-)