... Hyperion is the largest highly irregular (non-spherical) body in the solar system. ... Like most of Saturn's moons, Hyperion's low density indicates that it is composed of water ice with only a small amount of rock. ... The Voyager images and subsequent ground based photometry indicate that Hyperion's rotation is chaotic , i.e. its axis of rotation wobbles so much that its orientation in space is completely unpredictable. ... Will Hyperion's rotation remain chaotic forever? ... Saturn .. Titan .. ...

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• APOD: 2004 March 3 - Opportunity Rover Indicates Ancient Mars Was Wet
• Saturn's Possible New Moons
• Astronomical Names

... Most of UNIVERSAT-2009 participants will need a visa when entering the Russian Federation. ... Please take into account that the Organizing Committee needs about two months to provide this Official Invitation Letter and you will need about one month to apply for visa. For those who need the invitation letters confirming their participation in the UNIVERSAT-2009 meeting for other purposes (like funding or booking) the letters of such kind will be easily issued on the request. ...

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... 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. ...

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Janus . Saturn X - 1980S1 . ... Janus has an irregular shape with a size of 196x192x150 kilometers (122x119x93 miles) in diameter. ... Janus and Epimetheus share the same orbit of 151,472 kilometers (94,125 miles) from Saturn's center or 91,000 kilometers (56,547 miles) above the cloud tops. ... Janus Statistics . ... Janus - The Rotating Moon of Saturn . ... As with all maps, it is the cartographer's interpretation; not all features are necessarily certain given the limited data available. ...

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• Saturn's Moon Rhea
• Saturn's Moon Epimetheus
• Saturn's Moon Enceladus

... Opportunity Rover Indicates Ancient Mars Was Wet . ... Credit: Mars Exploration Rover Mission , JPL , NASA Explanation: Was Mars ever wet enough to support life? To help answer this question, NASA launched two rover missions to the red planet and landed them in regions that satellite images indicated might have been covered with water. ... Pictured above , Opportunity looks back on its now empty lander. ... Публикации с ключевыми словами: Mars - Opportunity rover - water - Марс - марсоход . ...

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• Opportunity Rover Indicates Ancient Mars Was Wet
• Journal "Peremennye Zvezdy"
• Jagged Shadows May Indicate Saturn Ring Particles

. The XMM-Newton website has moved to the following location: . http://www.cosmos.esa.int/web/xmm-newton

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... S/ 1981 S 15 174000 S/ 1981 S 16 220000 S/ 1981 S 17 231000 S/ 1981 S 18 185000 S/ 1981 S 19 186000 S/ 1995 S 1 137450 S/ 1995 S 2 139700 S/ 1995 S 3 141050 S/ 1995 S 4 146450 S/ 1995 S 5 140060 S/ 1995 S 6 139910 S/ 1995 S 7 139440 The first two groups are derived from analysis of Voyager 2 data reported in IAUC 6162 ; the third group is from HST observations during the May 1995 ring ... S/1995 S 3 orbits just outside the F ring and is apparently a shepherd moon . ... New Moons ....

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• Astronomical Names
• Saturn's Moon Enceladus
• Tethys

... Abstract Indicate whether a 3x3 matrix is a rotation matrix. ... Brief_I/O Variable I/O Description -------- --- -------------------------------------------------- m I A matrix to be tested. ntol I Tolerance for the norms of the columns of m. dtol I Tolerance for the determinant of a matrix whose columns are the unitized columns of m. The function returns the value SPICETRUE if and only if m is a rotation matrix. ... The test criteria can be adjusted by varying the parameters ntol and dtol. ... dtol...

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• Polarizer Quad Filter
• Methane Quad Filter
• ST ScI Preprint #1361

. Contact Webmaster for web page errors, corrections, ommisions, and/or additions. This page last updated: March 5, 2008 - JMD . This page last checked: February 23, 2007 - JMD . Click for forcast Click for IR Loop . NWS HAFB Topo Loop . NWS El Paso Topo Loop .

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• Instrument Orientations and Offset Directions

Alfa_ang is a GUI for the rotang routine. The purpose of this routine is to calculate the optimum rotation angle for ALFA given the RA and Dec of a source and the date and time of the observation. The routine also returns the azimuth and zenith angle of the telescope at the requested time, thus it can be used to find the correct rotation angle and azimuth for the Fixed Azimuth Drift Scan observing mode used by the AGES drift precursor observation. ... To run alfa_ang at Arecibo: . ...

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• Planetary Radar at Arecibo Observatory

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Space Flight . ... By admin August 17, 2015 Posted in: Armagh Planetarium . ... If you are not a regular pinner, Pinterest is a website where users can share images and media. Inside of just liking and sharing content, users can pin media onto different pin boards, arranged perhaps by theme or content. ... Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration. ...

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• Vesta: Asteroid seen by Dawn spacecraft | Astronotes
• Space Shuttle | Astronotes
• UFOs And Fringe Science | Astronotes

... If the Earth is round, the Sun must be north of the equator in northern summer, and south of the equator in northern winter. ... From the Earth's perspective, the Sun is spiraling from north to south and back again along the ecliptic (see figure 7 ). ... The round Earth, at the summer solstice. ... If the rotation axis of the Earth is tilted with respect to its orbit, the equator bobs back and forth, causing the Sun to be north for half the year, and south for the other half (see figure 9 ). ...

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• ASP: Making Your Own Astronomical Camera
• ASP: Good Astronomy Activities on the WWW
• ASP: What If the Moon Didn't Exist?

ATNF Student Symposium 2001 First Session Chair: Erik Muller 9.30am Melanie Johnston-Hollitt An Interpolated All Sky Rotation Measure Map 9.50am Daniel Mitchell Interferometric Decorrelation of Low to Mid Earth Orbiting Satellite Signals 10.10am Sebastian Gurovich Baryonic Tully Fisher Relation from HIPASS galaxies 10.30am Tracy Getts OH/IR Stars and the Galactic Centre Distance 10.50am Co ee Second Session Chair: Daniel Mitchell 11.10am Hayley ... Dion Lewis Pulsar glitches at Parkes and Mt. ...

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• PM Survey Status
• Satellite Tracking
• Using SPC

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Through improving the search criteria used in Christou (2000b) and numerical integrations of candidate coorbitals, we have identified approximately 51 (44) objects currently in co-orbital libration with Ceres (Vesta). We show that these form part of a larger population of transient coorbitals; 129 (94) MBAs undergo episodes of co-orbital libration with Ceres (Vesta) within a 2 Myr interval centred on the present. ...

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• Irregular Satellite Research
• Coronal Oscillations above Sunspots: Why?
• Mutual Events of the Uranian Satellites

Here, a smooth particle hydrodynamics (SPH) simulation, in which matter is represented as particles, is used to model tidal stripping from a Titan-sized satellite consisting of 45 percent ice in an outer mantle and 55 percent silicate and metal in an inner core. The frames show material stripped from the satellite after [left] 8 simulated hours and [right] 25 simulated hours, assuming a fixed satellite orbit indicated by the outer dashed circle. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B2F5B8240-5EC7-427E-BC09-F7A1BA8AFE6E%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7BF84AA60E-895B-49D0-9073-F5C48200A9BA%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B7E241BF2-1B50-48AA-B65F-4D161C63E2EE%7D

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• Thermal History of the Universe

... Data access . ... Updated data on the current orientation of the spacecraft Coronas-Photon in the ecliptic coordinate system. ... Data are updated 4 times a day. download the data for three months . download the data for all time . download the data for three months . ... The TESIS observatory (LPI) . TESIS: www.tesis.lebedev.ru . 1953-2016 Laboratory of X-ray astronomy of the Sun, LPI RAS, Russia . ... 7(499)132-65-96, Fax: +7(499)132-65-97 . ...

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... 8, ``Celestial Mechanics'', 2002 The Lyapunov spectra in spin--orbit dynamics V. V. Kouprianov, I. I. Shevchenko Pulkovo Observatory, St. Petersburg, Russia We study the problem of the chaotic rotation of a minor planetary satellite around its mass center, in the planar and spatial settings. ... The rest of the satellites in our set rotate regularly in synchronous resonance; but, in any case, each of them had passed through the stage of chaotic rotation. ...

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• http://www.ipa.nw.ru/conference/2002/sovet/PS/YAGUDINA.PS
• http://www.ipa.nw.ru/conference/2002/sovet/PS/FOMINOV.PS
• http://www.ipa.nw.ru/conference/2002/sovet/PS/MELNIKOV.PS

... 29a. Satellite looking up . 29c. Satellites probing around . ... The US Air Force furthermore sponsors polar satellites of the DMSP series, scanning the cloud cover of the polar region and also studying ions and electrons of the magnetosphere. ... The Canadian satellite Alouette in 1962 bounced radio signals off the top of the ionosphere, and UARS (Upper Atmosphere Research Satellite) has studied the Earth atmosphere. ... Next Satellite Class: #29c Those observing local conditions . ...

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• How SCA-1 measurements are organized.
• Polar Orbiting Satellites
• Thermodynamic system for satellite attitude determination (TDSAD)

Databases (NSDC) of the Natural Planetary Satellites. ... NSDC: Database of astrometric observations of Natural Planetary Satellites . ... They are thoroughly looking for observations in different sources, creating their owndatabases which are then mostly inaccessible to other researchers. ... In the file "content" with explications, the reference is given to the data source as well as the bibliographic reference. ... Data sources. ... Why a specific bibliographic database for Natural satellites? ...

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• IMCCE-SAI: Natural Satellites Service. Parameters and constants
• Data bases of Natural Satellites. Documentation. Manual
• jg0025