| Piú viste - Mariner, Viking & MGS's Maps & Mars in the '70s |
N-Mariner6-01_enf_08.jpgMars from Mariner 6: approaching Mars54 visitevedasi quanto dedotto in sede di commento al frame precedente
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N-Mariner6-01_cof_15d.jpgMars from Mariner 6: approaching Mars54 visiteLa distanza da cui questa spettacolare immagine è stata ripresa è di poco superiore ad 1 MKM.
Vi suggeriamo di notare l'incredibile ampiezza del Polo Sud e quindi di paragonare questo frame con altri frames similari ottenuti negli Anni '90 e quindi con le immagini MGS (o MRO o anche - sebbene trattasi di immagini inattendibili - Mars Express) che rappresentano la medesima Regione.
Le conclusioni primarie ed interlocutorie - ma comunque significative - le lasciamo a Voi.
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N-Mariner7-07_pmf_72.jpgMars from Mariner 7: approaching Mars (7)54 visitenessun commento
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O-Mariner9-72-Pollack_Crater_and_White-Rock.jpgPollack Crater and "White Rock" from Mariner 9 (RAW Frame - credits: NASA)54 visite"...It was interesting to browse through the Mariner 9 data set to locate these images, because evidently the Mariner 9 Team wasn't sure to make of these strange bright deposits.
The first one I posted was described as "white rock" in a comment on the image, and that name has stuck. But another image's descriptive comment read "curious ice patches".
Another totally misidentified not only the nature but the location of the photo, describing it as "Polar Cap".
Comments on images of other places in the Mariner 9 Catalog generally reflect the fact that Mars had not yet been systematically surveyed by an orbiter, so the scientists often weren't quite sure what they were looking at, and even when it was clear there were craters, those craters had mostly not yet been named.
I came across comments like "peculiar filametary structure" and "possible craters" and "streaky detail" and "cloud?" and "multitude of surface detail" and "odd fork-shaped bright pattern."
It's fun to browse through that table and imagine surveying Mars, with a spacecraft stationed at the Planet for the first time, made all the more dramatic by its initial obscuration by a dust storm that slowly cleared.
Mariner 9 is one of the more challenging data sets to work with because it's just so old. However, everything you need to access it, find images, view them, and convert them to more familiar formats is readily available online. First of all, the data itself can be found by browsing the data volumes at the PDS Imaging Node, and you can learn a little bit about the data at the National Space Science Data Center. To figure out what's what and to try to track down images of specific areas, you can download this spreadsheet (XLS format, zipped, 7.5 MB) containing an index to all the images.
The images are all in a format that won't be familiar to most of you, but like most spacecraft data you can convert a folder full of images to PNG format using my favorite amateur-produced software, Björn Jónsson's IMG2PNG. However, if you're only working with a couple of images, I'd recommend a different amateur-produced piece of software for converting the images, Piotr Masek's MarinerView, because MarinerView can be used to correct the Mariner 9 images (one at a time) for the little white specks of noise that are spattered across every one.
I'm slowly working on tracking down images of "White Rock" taken by every mission. First Mariner 9, then the Viking orbiters, then Mars Global Surveyor's MOC, then Mars Odyssey THEMIS, then Mars Express HRSC, and, finally, I should be able to produce Mars Reconnaissance Orbiter views from three different instruments: HiRISE, CTX, and CRISM. Stay tuned for further installments...".
Emily Lakdawalla (Planetary Society)MareKromium
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O-Mariner9-04.jpgMars from Mariner 9: the North Pole of Mars53 visitenessun commento
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O-Mariner9-03.jpgMars from Mariner 9: Collapsed terrain53 visitenessun commento
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O-Mariner9-02.jpgMars from Mariner 9: Olympus, alias Nix Olimpica53 visitenessun commento
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O-Mariner9-00.jpgMars from Mariner 9: Canyons, troughs and cracks53 visitenessun commento
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N-Mariner6-02_con_07b.jpgMars from Mariner 6: Crater Clusters' Region and Lava Flows53 visitevedasi quanto dedotto in sede di commento al frame precedente
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N-Mariner6-02_con_05b.jpgMars from Mariner 6: Lava Flows and shallow craters53 visiteNota: il "punto scuro" che si vede circa ad ore 08:00 del frame potrebbe essere l'ombra di Deimos (anche se non siamo in grado di escludere l'ipotesi per cui si possa anche trattare di un image-artifact).
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N-Mariner6-02_enn_06.jpgMars from Mariner 6: Martian Landscape53 visitenessun commento
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N-Mariner7-05_enf_59.jpgMars from Mariner 7: approaching Mars (5)53 visitenessun commento
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