| Risultati della ricerca nelle immagini - "Night-Sky" |
OPP-SOL687-1N189145698EFF64KCP2731R0M1.jpgLight in the Night...57 visiteOriginal caption:"Right Nav-Cam Non-linearized Full frame EDR acquired on Sol 687 of Opportunity's mission to Meridiani Planum at approximately 04:23:22 MLT".
Nota: dal cuore della notte Marziana, una curiosa luminescenza - la cui forma ci ricorda le grandi galassie a spirale riprese dall'HST - sembra emergere dal buio. Saranno forse le prime luci dell'alba che su Marte si annunciano, di regola, producendo questi "effetti luminosi" nel cielo? Purtroppo non riusciamo a distinguere nulla, neppure una parvenza di orizzonte e quindi, onestamente, per frames come questo, ipotizzare vuol dire - nel 99% dei casi - dire delle stupidaggini.
Siamo consapevoli di questo rischio però, dato che la NASA - come sempre - non commenta, noi proviamo ad azzardare qualcosa.
E Voi? Avete qualche idea al riguardo?
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OPP-SOL687-1P189145698EFF64KCP2731L1M1.jpgLight in the Night...65 visiteOriginal caption:"Left Pan-Cam Non-linearized Full frame EDR acquired on Sol 687 of Opportunity's mission to Meridiani Planum at approximately 04:23:22 MLT.
Camera commanded to use Filter 1 (739 nm)".
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OPP-SOL687-1P189145987ESF64KCP2731L1M1.jpgIn the lights of the dawn... (1)73 visiteOriginal caption:"Left Pan-Cam Non-linearized Sub-frame EDR acquired on Sol 687 of Opportunity's mission to Meridiani Planum at approximately 04:28:03 MLT.
Camera commanded to use Filter 1 (739 nm)".
Nota: un cielo (almeno in apparenza) abbondantemente rannuvolato accoglie i primissimi bagliori dell'alba? Può darsi.
E l'oggetto che appena riesce a distinguersi nella foschia luminescente? Sarà la Terra o magari Phobos?
Noi opteremmo - vista la forma e la luminosità - per la (lontana) Terra, ma potremmo sbagliarci...
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OPP-SOL687-1P189146804ESF64KCP2731L1M1.jpgIn the lights of the dawn... (2)152 visiteOriginal caption:"Left Pan-Cam Non-linearized Sub-frame EDR acquired on Sol 687 of Opportunity's mission to Meridiani Planum at approximately 04:41:18 MLT.
Camera commanded to use Filter 1 (739 nm).
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OPP-SOL687-1P189146928ESF64KCP2731L1M1.jpgIn the lights of the dawn... (3)75 visiteOriginal caption:"Left Pan-Cam Non-linearized Sub-frame EDR acquired on Sol 687 of Opportunity's mission to Meridiani Planum at approximately 04:43:19 MLT.
Camera commanded to use Filter 1 (739 nm)".
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SOL632-1-A_Orion_Composite-A640R1_br2~0.jpgOrion...through the eyes of Spirit! (1) - Sol 63254 visiteOriginal caption:"NASA's MER Spirit continues to take advantage of extra solar energy by occasionally turning its cameras upward for night sky observations. Most recently, Spirit made a series of observations of bright star fields from the summit of "Husband Hill" in Gusev Crater on Mars. Scientists use the images to assess the cameras' sensitivity and to search for evidence of nighttime clouds or haze. The image on the left is a computer simulation of the stars in the constellation Orion. The next three images are actual views of Orion captured with Spirit's PanCam during exposures of 10, 30, and 60 seconds".
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SOL632-2-A_Orion_Composite-A640R1_br2.jpgOrion...through the eyes of Spirit! (2) - Sol 63254 visiteOriginal caption:"Because Spirit is in the Southern Hemisphere of Mars, Orion appears upside down compared to how it would appear to viewers in the Northern Hemisphere of Earth. "Star trails" in the longer exposures are a result of the Mars' rotation. The faintest stars visible in the 60" exposure are about as bright as the faintest stars visible with the naked eye from Earth (about magnitude 6 in astronomical terms). The Orion Nebula, famous as a nursery of newly forming stars, is also visible in these images. Bright streaks in some parts of the images aren't stars or meteors or unidentified flying objects, but are caused by solar and galactic cosmic rays striking the camera's detector.
Spirit acquired these images with the PanCam on Sol 632 (Oct. 13, 2005) at around 45 minutes past midnight MLT, using the camera's broadband filter (wavelengths of 739 nnmts plus or minus 338 nnmts)".
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SOL632-2N182429299EFFAEVOP2748R0M1.jpgMartian Night (1) - Sol 63254 visiteOriginal caption:"Right Nav-Cam Non-linearized Full frame EDR acquired on Sol 632 of Spirit's mission to Gusev Crater at approximately 00:44:55 MLT".
Portate il frame sino al full-size e poi osservate i piccoli tratti chiari - noi ne contiamo 8 - che caratterizzano la sezione centrale del frame. Si tratta di raggi cosmici? O forse di stelle che sono diventate "tratti luminosi" a causa della lunghezza dell'esposizione? Sono photo-artifacts?
Ma soprattutto: gli Amici del Centro Controllo Missione che cosa stavano cercando di fotografare?...
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SOL632-2P182429429EFFAEVOP2748L1M1.jpgMartian Night (2) - Sol 63254 visiteOriginal caption:"Left Pan-Cam Non-linearized Full frame EDR acquired on Sol 632 of Spirit's mission to Gusev Crater at approximately 00:47:02 MLT. Camera commanded to use Filter 1 (739 nm)".
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SOL632-2P182430114EFFAEVOP2749L1M1.jpgMartian Night (3) - Sol 63254 visiteOriginal caption:"Left Pan-Cam Non-linearized Full frame EDR acquired on Sol 632 of Spirit's mission to Gusev Crater at approximately 00:58:08 MLT. Camera commanded to use Filter 1 (739 nm)".
Di frames simili a questi tre che Vi abbiamo proposto ce ne sono ancora molti ma, come ovvio, senza spiagazioni di "accompagnamento", non ci dicono granchè.
Anzi, ci dicono - in fondo - una cosa sola: il Cielo Notturno di Marte è bello e decisamente interessante. Talmente interessante che, dopo mesi e mesi di abbandono, la NASA ha ripreso a fotografarlo con una certa assiduità. La NASA ha detto ufficialmente - a proposito dei primi frames - che questo tipo di immagini servivano per riprendere Deimos e Phobos e consentire agli Scienziati di verificare (ma "come"??) i loro percorsi orbitali (ci è difficile pensare ad una baggianata più grossa e peggio concepita di questa ma... tanto è e tanto Vi diamo); adesso, probabilmente, ci diranno che si tratta di semplici "prove" e di "verifica dell'O.A. nelle ore notturne".
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SOL639-PIA03201.jpg"Phobal" eclypse (1) - Sol 63954 visiteNASA's MER Spirit continues to take advantage of favorable solar power conditions to conduct occasional nighttime astronomical observations from the Summit Region of Husband Hill. Spirit has been observing the martian moons Phobos and Deimos to learn more about their orbits and surface properties. This has included observing eclipses. On Earth, a solar eclipse occurs when the Moon's orbit takes it exactly between the Sun and Earth, casting parts of Earth into shadow. A lunar eclipse occurs when the Earth is exactly between the Sun and the Moon, casting the Moon into shadow and often giving it a ghostly orange-reddish color. This color is created by sunlight reflected through Earth's atmosphere into the shadowed region. The primary difference between terrestrial and martian eclipses is that Mars' moons are too small to completely block the Sun from view during solar eclipses.
Recently, Spirit observed a "lunar" eclipse on Mars. Phobos, the larger of the two martian moons, was photographed while slipping into the shadow of Mars.
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SOL639-PIA03201_fig1.jpg"Phobal" eclypse (2) - Sol 63977 visiteJim Bell, the astronomer in charge of the rover's panoramic camera (Pancam), suggested calling it a "Phobal" eclipse rather than a lunar eclipse as a way of identifying which of the dozens of moons in our solar system was being cast into shadow.
With the help of the Jet Propulsion Laboratory's navigation team, the Pancam team planned instructions to Spirit for acquiring the views shown here of Phobos as it entered into a lunar eclipse on the evening of the rover's 639th martian day, or sol (Oct. 20, 2005) on Mars. This image is a time-lapse composite of eight Pancam images of Phobos moving across the martian sky. The entire eclipse lasted more than 26 minutes, but Spirit was able to observe only in the first 15 minutes. During the time closest to the shadow crossing, Spirit's cameras were programmed to take images every 10 seconds.
In the first three images, Phobos was in sunlight, moving toward the upper right. After a 100-second delay while Spirit's computer processed the first three images, the rover then took the fourth image, showing Phobos just starting to enter the darkness of the martian shadow. At that point, an observer sitting on Phobos and looking back toward the Sun would have seen a spectacular sunset! In the fifth image, Phobos appeared like a crescent, almost completely shrouded in darkness.
In the last three images, Phobos had slipped entirely into the shadow of Mars. However, as with our own Moon during lunar eclipses on Earth, it was not entirely dark. The small amount of light still visible from Phobos is a kind of "Mars-shine" -- sunlight reflected through Mars' atmosphere and into the shadowed region.
Rover scientists took some images later in the sequence to try to figure out if this "Mars-shine" made Phobos colorful while in eclipse, but they'll need more time to complete the analysis because the signal levels are so low. Meanwhile, they will use the information on the timing of the eclipse to refine the orbital path of Phobos. The precise position of Phobos will be important to any future spacecraft taking detailed pictures of the moon or landing on its surface. In the near future it might be possible for one of the rovers to take images of a "Deimal" eclipse to learn more about Mars' other enigmatic satellite, Deimos, as well.
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