1000 Sols . ... 12.06.2015 . ... Credit Copyright: NASA , JPL-Caltech ; Mosaic Processing: Marco Di Lorenzo, Kenneth Kremer Explanation: Shortly before Mars' June 2015 conjunction, the Curiosity Rover celebrated 1000 sols on the red planet . After its August 5, 2012 landing, Curiosity's 1000th sol or martian day on the surface corresponded to planet Earth's calendar date May 31, 2015. ... The mosaicked panorama was constructed with images from navigation cameras taken on Curiosity's sol 997. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2015 June 13 . 1000 Sols . ... Explanation: Shortly before Mars' June 2015 conjunction, the Curiosity Rover celebrated 1000 sols on the red planet . After its August 5, 2012 landing, Curiosity's 1000th sol or martian day on the surface corresponded to planet Earth's calendar date May 31, 2015. ... Calendar | ... About APOD | ...

Communications For Your Astronomy Event . ... In the 1960s, 70s, 80s, and 90s, Ham Radio did a good job of supplying radio systems and operators to assist in the communication needs of organizations. In the good old days, Ham Radio was useful for small events (under a mile radio distance), medium events (under 10 miles) and widespread events using repeaters. ... With the advent of GMRS and especially FRS, the need for Ham Radio for short and medium range event communications has all, but vanished. ...

... One possible application of a solar sail is a spacecraft to warn Earth of approaching interplanetary disturbances and shocks. ... Spacecraft that can provide such a warning are currently stationed at (or near) the Lagrangian L1 point , between the Earth and the Sun--at about 4 times the distance of the moon and 1/100 times that of the Sun. ... Because of the greater distance from Earth, the Earth's pull there is weaker, not enough to make the spacecraft match the Earth's motion around the Sun. ...

This groups includes about 200 communication satellites ("comsats") scattered in synchronous orbits above the Earth's equator. ... 6 Earth radii (42,000 km or 26,000 miles), these satellite make one orbit per day, and therefore as the Earth turns, they always stay above the same ground station. ... Still another application is the 24-satellite network of the "Global Positioning System" (GPS), in circular orbits at distances of about 4.1 Earth radii (26,000 km or 16,000 miles). ...

Netscape Communications Corporation ("Netscape") and its licensors retain all ownership rights to this document (the "Document"). ... Netscape may revise this Document from time to time without notice. ... The Document is copyright 1997 Netscape Communications Corporation. All rights reserved. ... Netscape's logos and Netscape product and service names are also trademarks of Netscape Communications Corporation, which may be registered in other countries. ...

Next: Cosmological Molecular Clouds Up: HST and the Previous: Cepheids in NGC . ... Recent calibrations of stellar surface brightness derived by modern observational interferometry show that the Cepheid PLC relations turn out to be much less affected by abundance effects than PL ones. Extragalactic Cepheid distances revisited by a calibrated PLC (V, V-Ic) relation indicate some significant systematic shifts affecting current PL determinations achieved by ground-based and HST photometry. ...

.

... Watchouts . ... Help . It has been found by several PN exposures that the event list corresponding to a certain quadrant (3 contiguous CCDs) is truncated. This makes one (or more) quadrant(s) to appear fainter even in exposure corrrected images. ... It has been found that it was present only for some of the SAS versions in the past. SAS 6.5 is definitively affected. ... It follows a complete list of the affected exposures up to revolution 1051: . ... Pages maintained by SAS librarian . ...

... The necessity of simultaneous access to one communication channel by many users, e.g., in satellite communication systems or cellular telephony, has led to the development of the corresponding standards: FDMA (Frequency Division Multiple Access) and TDMA (Frequency Division Multiple Access). ... There is a number of ideas for chaotic signal applications in multiple-access systems, but as a rule, chaotic signals are used there only as efficient and versatile means of quasi-noise signal formation. ...

IF <logical expression> THEN <statement>.. ELSEIF <logical expression> THEN <statement>.. ELSE <statement>.. CIF . ... ELSEIFs when present must precede any corresponding ELSE. ... When the IF or ELSEIF condition has the value .TRUE., the statements following are executed and control is transferred to the statement following the CIF. ... When the IF and all ELSEIF clauses have a value which is .FALSE., control is passed to the statement following the corresponding ELSE or CIF. ...

... Flux density at 1 GHz (/Jy): 28 . ... Radio: Shell, brightest to the S. Optical: Filaments correspond well to the radio shell, brightest in SE. X-ray: Brightest to NW, with point source near centre. Point sources: Central, variable X-ray source, and nearby pulsar. ... Molonglo at 408 MHz (3') and Parkes 64-m at 5 GHz (4'). ADS . ... ASCA observations of compact X-ray source. ... X-ray variability of central source. ... ATCA at 1.4 GHz (50''), including H I absorption to central source. ...

. Launch Windows . "To Launch Or Not To Launch..." . Previous . Main . Next .

Next: Results and Discussion Up: Evolution of Supernova Explosion Previous: - Dependence for the . In order to construct the - dependence for supernova explosions, we calculated separately the m ( z ) in the R band and N ( z ) taking the cosmological and evolutionary effects into account. ... where n(t) is the SN rate as a function of age of the galaxy, t(z) is the age of the galaxy as a function of its redshift, and is the density of galaxies in the Universe. ...

... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... ESO . ... Survey Telescopes . ... Star Clusters . ... Stars@ESO . ... Integral Field Units . ... This animation shows what happens as a sunspot (or starspot) forms and the magnetic field increases in strength. ... The dark spectra lines in the spectrum of the emitted light split into three components and the strength of the circular polarisation in parts of the spectrum increases significantly. ...

Computer Ephemeris. Lunar orbital data. Explanations. ... mean longitude of the Moon (degrees) . ... mean longitude of lunar node (degrees) . inclination of mean lunar equator to real equator of the Earth (degrees) . angular distance from ascending node of mean lunar equator on real equator of the Earth to ascending node of mean lunar equator on ecliptic (degrees) . angular distance from real equinox to ascending node of mean lunar equator on real equator of the Earth (degrees). ...

Full-Text Search . ... arXiv.org . astro-ph . ... SAI VO . Search sort results by Date Relevance . ... Whitespace-separated words are treated as AND ed. Show 10 50 100 articles per page in Full Compact mode . Bonnell, Ian A. Bonning, E. W. Bonnet-Bidaud, J. M. Bonnarel, Francois . ... Bonnefoy, M. Bonnoli, Giacomo . ... Bonnin, C. Bonnell], I. A. Bonnamy, A. Bonnevier, Johan . ... Bonnaud, G. Bonnin, M. Bonnini, E. Bonnivard, V. Bonner, Collin S. Bonne, Nicolas J. Bonnefille, Max . ...

XPA supports both inet and unix (local) socket communication. XPA uses sockets for communication between processes. It supports three methods of socket communication: inet, localhost, and unix. ... You can set up a different method by typing something like: setenv XPA_METHOD local # unix csh XPA_METHOD=local; export XPA_METHOD # unix sh, bash, windows/cygwin set XPA_METHOD=localhost # dos/windows The options for XPA_METHOD are: inet , unix (or local ), and localhost . ... Go to XPA Help Index ...

... Although researchers have been studying astronomy and biology for hundreds of years, astrobiology is relatively new to the list of "named" fields of scientific research. ... Astrobiology encourages the new 21st century paradigm under which researchers, educators, and students seek new multi- and interdisciplinary solutions to profound research . The trick is how to achieve close coordination of diverse scientific disciplines and programs. ...

... June 9, 1999 . NGC 4414: A Telling Spiral . ... the Hubble Heritage Team ( AURA / STScI / NASA ) . Explanation: How far away is this galaxy? ... Spiral galaxy NGC 4414 contains many Cepheid variable stars that oscillate in a way that allows astronomers to estimate their distance. ... NGC 4414 shows many classic spiral galaxy features, including thick dust lanes , a central region rich in old red stars, and winding spiral arms glowing with young blue stars. ... About APOD > . ...