Jupiter: the "King" and His Moons |
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Jupiter from 10,1 MKM65 vistePadre degli Dei e Signore incontrastato del Sistema Solare; troppo grande per essere solo un pianeta, ma troppo piccolo per diventare una stella. Con la sua luce giallo-arancio illumina i nostri cieli durante la notte ed è, assieme a Venere, uno dei primi astri ad essere visibile verso l'imbrunire ed è l'unico corpo celeste che può essere visto ad occhio nudo (sapendo dove guardare...) anche durante il giorno.
Questo è Giove.
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Jupiter from 77,6 MKM36 visteDid you know that the "Planet With The Shortest Day" is Jupiter?
The planet Jupiter has the shortest day of all the nine major planets in the Solar System: it spins around on its axis once every 9 hrs 55 mins and 29,69 secs. Jupiter is about five times further from the Sun than the Earth and so it's years are much longer than Earth years: Jupiter completes one "year" in 4.332,6 Earth days. Jupiter is also one of the brightest objects in the night sky (jointly with the star Syrius and planet Venus in our Northern Hemisphere and with the Alpha and Beta Centauri star system in the Southern Hemisphere).
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Jupiter from 81,3 MKM28 vistenessun commento
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Jupiter from 84,1 MKM26 vistenessun commento
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Jupiter from Cassini42 visteLa "falce" di un Giove crescente, ripresa dalla Sonda Cassini mentre si avvicinava e si apprestava ad effettuare il "fly-by" del Gigante Gassoso.
Una splendida immagine che ci ricorda alcune sequenze del capolavoro di Stanley Kubrick, "2001 - A Space Odyssey" in cui Giove appariva agli occhi di Dave Bowman proprio come lo vediamo in questo frame.
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Jupiter from Cassini-Huygens100 visteJupiter Data and Statistics
Mass (kg) = 1.900e+27
Mass (Earth = 1) = 3,1794e+02
Equatorial radius = 71.492 Km
Equatorial radius (Earth = 1) = 1,1209e+01
Mean density (gm/cm^3) = 1,33
Mean distance from the Sun = 778.330.000 Km
Mean distance from the Sun (Earth = 1) = 5,2028
Rotational period (days) = 0,41354
Orbital period (days) = 4332,71
Mean orbital velocity = 13,07 Km per second
Tilt of axis = 3,13°
Orbital inclination = 1,308°
Equatorial surface gravity (m/sec^2) = 22,88
Equatorial escape velocity = 59,56 Km per second
Magnitude (Vo) = - 2,70
Mean cloud temperature = - 121°C
Atmospheric pressure (bars) = 0,7
Atmospheric composition: Hydrogen 90%; Helium 10%
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Jupiter from Mars19 visteCaption NASA:"The HiRISE camera is the most powerful telescope to have left Earth orbit. As such, it is capable of some interesting astronomical observations.
This image of Jupiter and its major satellites was acquired to calibrate the pointing and color response of the camera. An oversight in planning this unusual observation put the focus mechanism in the wrong location, blurring the image. This does not detract from the calibration objectives, but makes the raw image less esthetic.
To compensate, the image has been "sharpened" on the ground by Dennis Gallagher, the HiRISE chief optical designer. With this sharpening, and because Mars is closer to Jupiter than Earth is, this image has comparable resolution as the HST's pictures of Jupiter.
The colors are not what is seen by the human eye because HiRISE is able to detect light with a slightly longer wavelength than we can (that is, the infrared)".
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Jupiter from the Stratosphere114 visteDalla Rubruica "NASA - Picture of the Day", del giorno 3 Giugno 2010:"SOFIA, the Stratospheric Observatory for InfraRed Astronomy, captured its "first light" images on May 26, from an altitude of 35.000 feet.
While flying above most of planet Earth's InfraRed-absorbing water vapor, SOFIA's premier IR views of the cosmos included this remarkable false-color image (right panel) of Jupiter.
For comparison, on the left is a recent, ground-based visible light image. Both show our Solar System's ruling gas giant without its dark Southern Equatorial Belt (normally seen in the upper Hemisphere in this orientation). That familiar feature faded from view early in May. But the bright white stripe in SOFIA's image is a region of Jupiter's clouds transparent to IR Light, offering a glimpse below the cloud tops".
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Jupiter in full detail, by Voyager 245 visteCaption NASA originale:"The colors have been enhanced to bring out detail. Zones of light-colored, ascending clouds alternate with bands of dark, descending clouds. The clouds travel around the planet in alternating eastward and westward belts at speeds of up to 540 Km p/h. Tremendous storms as big as Earthly continents surge around the planet. The Great Red Spot is an enormous anticyclonic storm that drifts along its belt, eventually circling the entire planet".
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Jupiter in natural colors, after being struck by Shoemaker-Levy 937 visteThis image of the giant planet Jupiter, by NASA's HST, reveals the impact sites of fragments "D" and "G" from Comet Shoemaker-Levy 9.
The large feature was created by the impact of fragment "G" on July 18, 1994 at 3:28 a.m. EDT. It entered Jupiter's atmosphere from the south at a 45° angle and the resulting ejecta appears to have been thrown back along that direction. The smaller feature to the left of the fragment "G" impact site was created on July 17, 1994, at 7:45 a.m. EDT by the impact of fragment "D".
This image was taken 1h and 45' after fragment "G" impacted the Planet. The "G" impact has concentric rings around it, with a central dark spot that is about 2.500 Km in diameter. Such a dark spot is surrounded by a thin, dark, ring whose diameter is roughly 7.500 Km.
Last (but not least...), the dark, thick, outermost ring's inner edge has a diameter of approx. 12.000 Km (the size of Earth...).
The impact sites are located in Jupiter Southern Hemisphere at a latitude of about 44°.
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Jupiter in ultraviolet light, after being struck by Shoemaker-Levy 937 visteUltraviolet image of Jupiter taken by the Wide Field Camera of the HST. The image shows Jupiter's atmosphere at a wavelength of 2550 Angstroms after many impacts by fragments of comet Shoemaker-Levy 9. The most recent impactor is fragment R which is below the center of Jupiter (third dark spot from the right). This photo was taken 3:55 EDT on July 21, 1994, about 2,5 hours after R's impact. A large dark patch from the impact of fragment H is visible rising on the morning (left) side. Proceeding to the right, other dark spots were caused by impacts of fragments Ql, R, D and G (now one large spot) and L, with L covering the largest area of any seen thus far.
The spots are all very dark in ultraviolet light because - we think - a large amount of dust, right after the impacts, was being deposited on the upper layers of Jupiter stratosphere - and dust absorbs Sunlight.
The dark, round spot just above the center of Jupiter is the moon "Io".
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Jupiter! (after New Horizons' Fly-By)14 vistenessun commento
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