Archive for the ‘Solar System’ Category

Sun Spectral Lines : First light of LHIRES III

Posted by Paulo Cacella on 24th January 2011 in Solar System, Spectroscopy, Sun
These were the first raw images obtained with the LHIRES III spectrograph. Configuration was of a slit of 15um, grating of 2400lines/mm. The detector was a Canon 350d. / / / / / / / /The resolution of images below is 0.082 A per pixel and a resolving power of R=24000. / / / /First the region around H-Alpha(6562.8 A). To see the full resolution click in the image (3x larger). / / / / / / / /Then Na doublet lines (5889.95 and 5895.92 A). To see the full resolution click in the image (3x larger). / / / / / / / /Finally the Magnesium triplet (5167.33, 5172.68 and 5183.61 A). To see the full resolution click in the image (3x larger). / / / /

Neptune spectrum

Posted by Paulo Cacella on 5th September 2010 in Planets, Solar System, Solar System, Spectroscopy
Basically we can see that Uranus and Neptune spectra are virtually identical with pronounced methane absorption lines as below / / / / / / / /

Ceres and Jupiter spectra

Posted by Paulo Cacella on 4th September 2010 in Asteroids, Planets, Solar System, Solar System, Spectroscopy
Here we have a 900s shot of Ceres in a C14-G11-DSS7.We compare Ceres(blue) with Jupiter(red). / / / /First we can see the Ceres color reflectance smoothed using Jupiter as a reference (what is not a smart idea). / / / / / / / /We can compare with SMASS results / / / / / / / /Here we can see the spectra of Ceres(blue) and Jupiter(red) / / / / / / / /BBelow we have a spectrum corrected for instrumentation and compared with a Sun class star (purple). Ceres is in green. / / / / / / / /SSame information as before but normalized. / / / /

Uranus spectrum

Posted by Paulo Cacella on 4th September 2010 in Planets, Solar System, Solar System, Spectroscopy
Here we can see a comparison between Jupiter (red) and Uranus(blue) spectra. The prominent methane absorption lines are clearly visible and strong red absorption shows why the planet is blue-green in visible. (C14-G11-DSS7 300 sec exposure) / / / / / / / /

Jupiter and Satellites (Io, Europa and Ganymede) spectra

Posted by Paulo Cacella on 3rd September 2010 in Planets, Solar System, Solar System, Spectroscopy
A very interesting study in spectroscopy is to compare spectra of Jupiter and its satellites. Below we can find spectra of Jupiter (blue), Io (purple), Ganymede(orange) and Europa (red). It is easy to see Methane on Jupiter atmosphere. These spectra were not corrected for instrumental behavior. Methane absorptions are located at 6190A,7250A,8444A,8650A,8880A. At 7900A we can see the ammonia and methane absorption. We can see easily also that Io’s spectrum is shifted to the right end. The peak in IO’s spectrum at around 8890A is a hot pixel effect. (C14-G11-DSS7, exposures of 3 sec for Jupiter and 300s for the satellites) / / / / / / / /More details can be seen below on mid-range and infra-red. Methane absorption is easily visible on Jupiter. / / / / / / / /