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Comet 67 P from Rosetta before landing

comet-67p-29-september-2016-from-rosettaThis is comet 67 P taken from ESA’s Rosetta probe from 14 miles above the surface as Rosetta was approaching the comet to land on its surface. This occurred about 7:20 am (EDT) this morning. Rosetta continued taking pictures until it touched down. As it got closer, the resolution showed remarkable detail (see below). Each pixel covered 10 cm of area. The mission was a success.

rosetta-landing-site

European Space Agency’s Rosetta finds Philae

philae_found-by-rosetta

Found: Philae lander finally spotted by Rosetta on comet 67P

Remember the European Space Agency’s Rosetta probe from November 2014? It went to Comet 67P/Churyumov-Gerasimenko and the Philae Lander touched down on the comet…and bounced, coming to rest in a shadow, preventing its batteries from charging. The lander did manage to operate for 3 days, sending back some pictures and other radar information. Unfortunately, the location of the lander had been undetermined until now. Images taken by the orbiting Rosetta spacecraft show Philae wedged against a dark cliff on the comet’s surface. This came just weeks before Rosetta is expected to make its own landing on the comet, ending the successful two-year mission.

The agency has known Philae’s rough location since June 2015, when unexpectedly, the lander woke up and briefly resumed radio contact. Since then, pinpointing its exact location has been the goal of the mission. Cecilia Tubiana said, “With only a month left of the Rosetta mission, we are so happy to have finally imaged Philae, and to see it in such amazing detail.”

Knowing the landing site will help mission scientists fully understand the data gathered by the probe. Now the data relayed back to Earth can be associated with a location.

But Rosetta doesn’t have long to celebrate this success. On September 30th, Rosetta will be commanded to land on 67P’s surface. It was never designed to do that. They’re planning to reduce landing speed to 1.2 mph. This will provide scientists a second chance to study a comet up close. Rosetta will end up in a slightly different part of the comet, where gas outbursts are erupting into space. Scientists hope to get information on the gas and dust being ejected from the comet.

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Stay tuned for information as it becomes available.

Asteroid Fly-by update

From spaceweather.com:

ASTEROID BUZZES EARTH, HEADS FOR MOON: Newly discovered asteroid2016 RB1 flew past Earth on Sept 7th only 25,000 miles above our planet’s south pole. Because of the asteroid’s southern trajectory, it did not pass within the orbits of any communication or weather satellites–but it was close. After it buzzed Earth, the space rock turned and headed for the Moon, executing a wider flyby of 179,000 miles on Sept. 8th. Researchers say 2016 RB1 is ~50 ft in diameter, about the size of a grey whale.

Well, as thought, it missed. And by 4,000 miles more than the original guess. But it was still close. Keep track of Near Earth Asteroids on spaceweather.com. And not just asteroids; if you attended our presentation of “Space Weather, Earth Climate”, you may remember how we said cosmic rays affect our climate. Well, you can track how cosmic rays are affecting our climate on spaceweather.com.

Check it out and stay tuned for information on a probe heading for an asteroid for surface samples. Reports to follow soon.

Asteroid Fly-by

Compliments of spaceweather.com:

ASTEROID FLYBY: Today, Sept. 7th, a truck-sized asteroid is flying past Earth only 21,000 miles above our planet’s surface. At closest approach, 2016 RB1 will actually skim the orbital-zone of geosynchronous satellites.  The odds of an impact with any spacecraft are, however, negligibly low.  image.

This one was discovered just yesterday (Sept. 6). This happens on occasion. We don’t always see them coming with much warning. This one is a little smaller than the one that exploded over Russia (bus sized) a couple of years ago. 21,000 miles is close. But it is a miss. And this one is only one of two discovered yesterday. Discoveries have been averaging 1 a week lately.

Stay tuned for more space stuff!

Planetary/Lunar Conjunction

planets conjunction

This picture comes compliments of spaceweather.com. Not only can you see the planets in the picture, but Saturn and Mars are visible just above the moon but outside of this field of view.  It’s not often we see all five naked-eye planets aligned like this. And if you have a telescope, you can view Neptune rising just as Venus sets.

This is impressive, but better than this, in the year 2040 (I hope to be here to see it), these same planets (all 5) will be in conjunction. beginning in June, they all will begin moving closer to each other until September 8, at 3:00 pm, when they will converge to within a few degrees of each other in the constellation Virgo around the star Porima. This appearance is known as the “Grand Conjunction” and occurs only once every 4,000 years. On top of this, the Moon (as a New Moon) will be there also.  And Uranus and Neptune will be in the sky (but not in conjunction with the rest) at the same time.

Long Wave Array

http://www.phys.unm.edu/~lwa/lwatv.html

Found this site thanks to Sterling N0SSC, who is doing his internship at the VLA in New Mexico right now. The LWA is a joint project by the University of New Mexico, Naval Research Laboratory, Virginia Tech, Los Alamos National Lab, and the Jet Propulsion Laboratory, to build a high-resolution radio telescope that takes continuous observations in the 10-88 MHz frequency range.

The LWA antenna array near the VLA array in New Mexico (image credit Sterling Coffey)
Close up view of the crossed-dipole receive antennas at the LWA (image credit Sterling Coffey)

At the top of the page is a near-live view of what the telescope is seeing right now – very cool! If you scroll down to the bottom there is a calendar with links to 24hr-peroid time lapse movies of what they have observed in the past, like this one. Well worth checking out!

Live sky above the LWA1

http://www.phys.unm.edu/~lwa/lwatv.html

More info on celestial navigation

Here’s some links for more information about celestial navigation from our presentation on April 30th, 2016.

History and general info:

Smithsonian Institute – Celestial Navigation at Sea

Space.com – Navigating by the stars

CelestialNavigation.net

Secrets of Ancient Navigators – Nova

Pytheas’ Measurements of Latitude – Wikipedia

How to:

Rough Science Challenge – Measure Latitude and Longitude

The Natural Navigator

Navigation by Sextant -PBS

Books:

American Practical Navigator (view online or download)

Longitude (preview below)