... Arecibo Observatory took radar images of asteroid 1998 QE2 and its moon as the space rock sailed safely past earth. ... Both the asteroid and its moon passed 6 million kilometers (3.8 million miles) from earth. ... Radar images of asteroid 1998 QE2 (bottom) and its satellite (top) on June 6. ... Radar images of asteroid 1998 QE2 (center) and its satellite (bottom left) on June 7. ... Radar image from June 7 showing the satellite moving past the primary. ...

... Rolling Across the Rocky Plains of Mars . ... Credit Copyright: Mars Exploration Rover Mission , JPL , NASA Explanation: You stare out across the rocky plains of Mars. ... You are being sent on a long journey to a distant crater, the largest crater in the region. ... You are the robotic Opportunity rover , and you are the eyes for countless humans following your trek back on planet Earth. Rolling about a football field a day, you might reach Endeavour crater sometime in 2012. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . ... Space Flight . ... Earth Satellites . ... February . ... By admin February 16, 2012 Posted in: Moon . A roll?n?rock can be seen in this image from NASA?s Lunar Reconnaissance Orbiter. ... This rolling stone gathered no moss but left its track in the regolith until the slope levelled off and it slowed to a halt. ... Then the Moon shone down on an Earth that€а looked superficially familiar to that of today but was oddly different. ...

Ida and Dactyl . Ida . ... On August 28, 1993 Galileo came within 2,400 kilometers (1,500 miles) of 243 Ida, the second asteroid ever encountered by a spacecraft. ... Dactyl . ... This color picture is made from images taken by the Galileo spacecraft about 14 minutes before its closest approach to Ida at a range of about 10,500 kilometers (6,500 miles). ... This image is the first full picture showing both asteroid 243 Ida and its moon Dactyl transmitted to Earth from NASA's Galileo spacecraft. ...

... 2010 October 4 . Rolling Across the Rocky Plains of Mars . Credit: Mars Exploration Rover Mission , JPL , NASA . Explanation: You stare out across the rocky plains of Mars. ... You are being sent on a long journey to a distant crater, the largest crater in the region. ... Rolling about a football field a day, you might reach Endeavour crater sometime in 2012. ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . NASA Web Privacy Policy and Important Notices . ...

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Site Info . ... It is from from Voyager 1 and shows a whopping big impact crater dominating the profile of the moon. Note that Mimas is about 400 kilometers across (about 250 miles). ... The wall around the crater is 5 kilometers high, and that central peak rises 6 kilometers above the surface (many impact craters have a large central peak which is caused by a pressure rebound from the impact). ... 2008 Phil Plait. ...

... Exposure Time Calculator (ETC) . Survey processing . ... VISTA is a 4-m class wide field survey telescope for the southern hemisphere, equipped with a near infrared camera (1.65 degree diameter field of view at VISTA's nominal pixel size) containing 67 million pixels of mean size 0.34 arcsec and available broad band filters at Z,Y,J,H,K s and a narrow band filter at 1.18 micron. A wide field visible camera, if constructed, could also be used on VISTA. ... Tile . ... ESO VISTA Public Surveys . ...

... We present a comparison of the surface density of young stars (неБ‹†) and dust surface density (неdust) across NGC 346 (N66) in 115 independent pixels of 6 ц— 6 pc2. ... We convert неdust to gas surface density (неgas) and неБ‹† to star formation rate (SFR) surface densities (неSFR), using simple assumptions for the gas-to-dust mass ratio and the duration of star formation. ... On small scales the неSFR derived using Hн± systematically underestimates the count-based неSFR, by up to a factor of 10. ...

Castalia . Asteroid 4769 . Asteroid 4769 Castalia is a near-Earth crossing asteroid that was discovered by Eleanor F. Helin (Caltech) on August 9, 1989. Scientists used radio astronomy and computer modeling to generate this image of Castalia. They obtained the data for the computer model in 1989 using the Arecibo radar/radio telescope in Puerto Rico when the asteroid passed within 5.6 million kilometers (3.5 million miles) of the Earth. ... Topographic Map of Castalia . ...

. Gaspra's very irregular shape suggests the asteroid came from a larger body by what was nearly a catastrophic collision. The large concavity on the lower right limb is about 6 kilometers (3.7 miles) across. The prominent crater on the terminator (center left) is about 1.5 kilometers (1 mile) across. A striking feature of Gaspra's surface is the abundance of small craters. More than 600 craters 100-500 meters (330-1650 feet) in diameter are visible in this image. NEAR / JPL / NASA

... A comparison of the computed and experimental relations F max ( H), as well as comparison of drift scans of point sources across different horizontal cross-sections of the BP with the corresponding computed cross-sections were made. ... The drift scans of the point source 3С84 (H=87 o ) at the wavelength 7.6 cm across the horizontal cross-sections of the BP (black lines) and the computed horizontal cross-sections of the BP corresponding to them (red lines). ...

... Figure 2: Spectrum-selection window . When the cursor is moved across the image (using the left-mouse button) a profile, from the cursor-position upwards to the height of the spectrum extraction-region height, is drawn at the bottom of the image. ... The program allows the approximate y cursor-coordinate of the zeroth-order spectrum to be either fixed at the cursor-position ( y Zero-order button unchecked , or refined using a centroiding algorithm ( yZero-order button checked . ...

... Astronomy Pictures . ... Jupiter . Jupiter from ANU's 24-inch telescope . ... Title: Jupiter from ANU's 24-inch telescope . Description: Several images of Jupiter from ANU's 24-inch telescope, Siding Spring Observatory. Lower half of picture: Close-up of Jupiter and the moon Ganymede, just before Ganymede "transits" (passes across) the face of Jupiter Upper half of picture: The image in the middle of the bottom row shows the shadow of Ganymede on the face of Jupiter about 30 minutes later. ...

... Site Map . ... PhD Thesis Topics offered by ESO Faculty Members > Thesis Topic: Study of the stellar populations across the whole Milky Way bulge: age map and star formation history . ... Observing with ESO Telescopes . ... The project consists in deriving accurate age map of the stellar population across the bulge to be then combined with information on the stellar kinematics and metallicity, with the ultimate goal of reconstructing the star formation history (SFH) of the Milky Way bulge. ...

... Events . ... COSMOS 2009 - Ireland's Spring Star Party . The Irish Node for the International Year of Astronomy is announcing that this year St PatrickтАЩs Festival celebrations in all major cities in Ireland are endorsing an astronomy theme. In Dublin , this yearтАЩs theme for the festival Parade is тАШ The SkyтАЩs the Limit! тАЩ . ... Monday, 16 March 2009 00:49 . International Year of Astronomy, Ireland National Node . ...

... click image to view discuss) . ... This is a quick shot of the near-Earth asteroid 2005 YU55 using four consecutive exposures from the Harvard MicroObservatory robotic telescope in Amado, Arizona, on the night of Nov. ... 10, 2015 . This is Comet Lovejoy C/2014 Q2 as it appeared at about 10:30 pm Saturday, Jan. 10, 2015, from my back yard in Belmont, MA, about 5 miles west of downtown Boston. ... Main image: 0.6 second exposure. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

Next: Extragalactic Gravitational Wave Background Previous: Transparency of the Stochastic . Let the sky be observed with a detector having a pencil beam diagram across. The number of stars per frequency decade that is swept by the detector is a function of celestial coordinates (say, galactic coordinates l , b ): . ... It is clear from the figure that for an all-sky detector the Galaxy becomes transparent above the frequency  Hz. ...

... The awsome spectacle of a brilliant comet, with its long ghostly tail streaming behind it, is a rare event. ... Only one other comet, Comet Halley, was seen so far from the Sun, giving scientists an opportunity to watch it as it slowly warmed up and sprouted a tail. ... Comets are the Rip Van Winkles of the solar system -- mini-worlds that have changed little during their 4.5-billion-year nap far from the Sun. ... Observing Comets . ... Once, comets inhabited the entire solar system. ...

National Aeronautics and Space Administration . Lyndon B. Johnson Space Center . ... SHANNON W. LUCID (Ph.D.) . nasa astronaut (former) . ... She is qualified for assignment as a mission specialist on Space Shuttle flight crews. ... A veteran of five space flights, Dr. Lucid has logged 5,354 hours (223 days) in space. ... Dr. Lucid retired from NASA in January 2012. ... In completing this flight, Dr. Lucid logged 838 hours and 54 minutes in space. ... FEBRUARY 2012 ...

... Today this year's largest group of sunspots will cross the Sun's central meridian. ... The next day, the number of spots in the group reached five, and the day after, on June 2nd, it was possible to count thirteen sunspots on solar disk, which had been clear prior to this. ... This year's two most powerful active areas, which passed across the solar disk at the beginning of May, 2009, are set to appear in the Sun's eastern sector in two days, on June 6th. ...