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Saturn-PIA21903-01.jpgThe End....122 visitenessun commentoMareKromiumGen 23, 2020
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Saturn-PIA21903-00.jpgThe End....111 visiteCaption NASA originale:"This view of Saturn looks toward thePplanet's Night Side, only lit by Sunlight reflected from the Rings.
A mosaic of some of the very last images captured by Cassini's cameras, shows the location where the Spacecraft would have entered the Planet's Atmosphere a few hours later. An annotated view (see the next frame) marks the entry site with an oval. While this area was on the Night Side of the Planet at the time, it would rotate into daylight by the time Cassini made its final dive into Saturn's Upper Atmosphere, ending its remarkable 13-year exploration of Saturn.
Images taken using red, green and blue spectral filters were combined to show the scene in Near Natural Colors. The images were taken with Cassini's wide-angle camera on Sept. 14, 2017, at a distance of approx. 394.000 miles (such as a little more than 634.000 Km) from Saturn.
The Cassini spacecraft ended its mission on Sept. 15, 2017".MareKromiumGen 23, 2020
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162173-Ryugu-000.jpg162173 Ryugu118 visiteLe caratteristiche superficiali di questo Asteroide della "Classe Apollo" lo rendono incredibilmente simile ad ALMENO altri due Asteroidi che ben conosciamo: 25143 Itokawa e 101955 Bennu. Tutti (almeno in teoria...) formatisi per "aggregazione gravitazionale di corpuscoli".
Interessanti, per tanti motivi. Ma soprattutto perché sono, di fatto, degli Asteroidi quasi completamente identici: nessun Cratere da Impatto e Boulders "enormi" ben visibili nelle loro immagini di profilo (tipo "Skyline").
A questo punto bisogna ammettere che i Tecnici della JAXA (l'Agenzia Spaziale Giapponese) hanno un "occhio" ed una "mira" davvero eccezionali! Chissà, oltre le dichiarazioni di facciata, che cosa stanno cercando... Volete un'ipotesi? Magari l'Origine della Vita sulla Terra. Oppure le modalità attraverso le quali questi Asteroidi non solo si formano, ma poi "sopravvivono", nonostante la loro "fragilità", alle Onde Gravitazionali (vedi: Limite di Roche) ed alle Ere (e qui parliamo di miliardi di anni).MareKromiumGen 21, 2020
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162173-Ryugu-001.jpg162173 Ryugu - Sunlit, and almost Sunstruck...121 visitenessun commentoMareKromiumGen 21, 2020
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162173-Ryugu-002.jpg162173 Ryugu - Wow! The shadow of Hayabusa 2123 visitenessun commentoMareKromiumGen 21, 2020
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162173-Ryugu-003.jpg162173 Ryugu - What a Shadow!!!112 visitenessun commentoMareKromiumGen 21, 2020
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162173-Ryugu-005.jpg162173 Ryugu - From the Surface118 visitenessun commentoMareKromiumGen 21, 2020
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162173-Ryugu-006.jpg162173 Ryugu102 visite...ma non Vi sembra di aver già visto qualcosa del genere?!?... Osservate BENE!!!...MareKromiumGen 21, 2020
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162173-Ryugu-020.png162173 Ryugu - Orbital Pattern129 visiteNella Nomenclatura Ufficiale, 162173 Ryugu è un Asteroide appartenente alla cosiddetta "Classe Apollo" (ossia una serie di Asteroidi prossimi alla Terra - Near-Earth - caratterizzati da un'orbita avente un Semiasse Maggiore superiore ad una U.A. - Unità Astronomica, e cioé la distanza media fra la Terra ed il Sole, vale a dire circa 150 MKM) ed un Perielio inferiore ad 1,017 U.A.
Scoperto nell'AD 1999, Ryugo presenta un'orbita caratterizzata da un Semiasse Maggiore pari a 1,189 U.A. e da un'eccentricità di 0,190, inclinata di 5,88405° rispetto all'Eclittica.
Le sue caratteristiche orbitali lo qualificano come "oggetto potenzialmente pericoloso" per la Terra ed esso è stato selezionato come obiettivo della missione Hayabusa 2 della JAXA, la quale prevede di recuperare alcuni campioni dall'Asteroide e riportarli sulla Terra. MareKromiumGen 21, 2020
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Neptune-PIA21629.jpgNeptune from the Saturnian Sky (Natural Colors; credits: NASA/JPL-Caltech/Space Science Institute)129 visiteCaption NASA:"On August 25, 1989, NASA's Voyager 2 made its historic Fly-By of Neptune and its largest moon, Triton. The Cassini Spacecraft took this image to celebrate the anniversary of that event.
Neptune appears in this Natural Color composite as a pale blue disk (similar to Cassini's image of Uranus from 2014), just below and to the right of image center. Most of the faint specks in the image are background stars, although some are likely Cosmic Rays (charged particles that strike the camera detector).
By imaging Neptune, Cassini's Solar System family portrait-taking is complete. The Mission's Planetary Photojournal includes all of the major Planets except Mercury, which is too close to the Sun to be imaged, as well as dwarf planet Pluto.
This view was acquired by the Cassini narrow-angle camera on Aug. 10, 2017, at a distance of approximately 2,72 Billion Miles (such as approx. 4,38 BKM) from Neptune. Red, blue and green filter images were combined to create this Natural Color image".MareKromiumGen 20, 2020
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ZZZ-Mercury-PIA19448.jpgFarewell Messenger!....132 visiteCaption NASA:"Originally planned to orbit Mercury for one year, the mission exceeded all expectations, lasting for over four years and acquiring extensive datasets with its seven scientific instruments and radio science investigation. This afternoon, the Spacecraft succumbed to the pull of Solar Gravity and impacted Mercury's Surface.
The image shown here is the last one acquired and transmitted back to Earth by the mission. The image is located within the Floor of the roughly 93-Km-diameter Impact Crater named "Jokai". The Spacecraft struck the Planet just north of Shakespeare Basin".
Date acquired: April 30, 2015
Image Mission Elapsed Time (MET): 72716050
Image ID: 8422953
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 72,0° North
Center Longitude: 223,8° East
Resolution: 2,1 meters/pixel
Scale: This image is about 1 Km across
Solar Incidence Angle: 57,9° (meaning that the Sun was 32,1° high on the Local Horizon)
Emission Angle: 56,5°
Phase Angle: 40,7°MareKromiumGen 20, 2020
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ZZZ-Mercury-PIA19445.jpgReady to say "Farewell"....97 visiteCaption NASA:"This image, acquired on April, 29th, 2015, is one of MESSENGER's last. On April 30th, the Spacecraft will complete its highly successful orbital mission and impact the Surface of Mercury.
Impact was expected at 19:26:02 UTC (3:26:02 pm EDT) but will occur out of sight and communication with the Earth. The MESSENGER Team will try to establish communications with the Spacecraft when its orbit would allow it to be visible from Earth. The inability to establish communications between MESSENGER and the scheduled Earth-based tracking antenna will provide the first confirmation that the Spacecraft has impacted the Surface. After about 30 minutes following the predicted Mercury Impact Time, the Team plans to announce whether MESSENGER's orbital mission has come to an end".
Date acquired: April 29, 2015
Image Mission Elapsed Time (MET): 72595737
Image ID: 8414772
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 69.46° North
Center Longitude: 229,49° East
Resolution: 1,7 meters/pixel
Scale: The largest crater in this image has a diameter of about 330 meters.MareKromiumGen 20, 2020
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