Mimas (bulan): Perbezaan antara semakan
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== Ciri-ciri fizikal == |
== Ciri-ciri fizikal == |
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Ketumpatan rendah Mimas (1.17) menandakan yang kebanyakan daripadanya terdiri daripada ais batu dengan sedikit amaun batu. Disebabkan tindakan kuasa pasang surut ke atasnya, bulan ini tidak sfera sepenuhnya; paksi terpanjangnya adalah 10% lebih panjang berbanding dengan paksi terpendeknya. Bentuk agak [[bujur (geometri)|bujur telur]] Mimas jelas kelihatan dalam gambar-gambar terkini daripada kapal ''[[Cassini-Huygens|Cassini]]''. |
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[[Image:Mimas shape.jpg|left|thumb|150px|Mimas, imaged by ''Cassini'', looking notably egg-shaped]] [[Image:Mimas (NASA) PIA06176.jpg|right|thumb|Mimas, silhouetted against Saturn's northern latitudes]] |
[[Image:Mimas shape.jpg|left|thumb|150px|Mimas, imaged by ''Cassini'', looking notably egg-shaped]] [[Image:Mimas (NASA) PIA06176.jpg|right|thumb|Mimas, silhouetted against Saturn's northern latitudes]] |
Semakan pada 10:52, 19 Julai 2006
Penjumpaan | |||||||
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Dijumpai oleh | William Herschel | ||||||
Dijumpai pada | September 17, 1789 | ||||||
Ciri-ciri orbit | |||||||
Paksi semimajor | 185,404 km | ||||||
Eccentricity | 0.0202 [1] | ||||||
Orbital period | 0.9424218 d [2] | ||||||
Inclination | 1.51° (to Saturn's equator) | ||||||
Is a satellite of | Saturn | ||||||
Physical characteristics | |||||||
Purata diameter | 397.2 km (418.2×392.4×382.8 km)
(0.0311 Earths) | ||||||
Permukaan luas | ~1,990,000 km2 | ||||||
Volume | ~32,900,000 km3 | ||||||
Jisim | 3.84×1019 kg
(6.4×10-6 Earths) | ||||||
Purata ketumpatan | 1.17 g/cm3 | ||||||
Permukaan graviti | ~0.065 m/s2 | ||||||
Halaju lepas | ~0.16 km/s | ||||||
Rotation period | synchronous | ||||||
Axial tilt | zero | ||||||
Albedo | 0.77 | ||||||
Permukaan suhu |
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Atmosfera | tiada |
Mimas (mye'-məs, IPA /ˈmaɪməs/, Bahasa Yunani Μίμᾱς, kadangkala Μίμανς) adalah satu bulan Zuhal yang telah dijumpai dalam tahun 1789 oleh William Herschel. Ianya dinamakan sempena Mimas, anak kepada Gaia dalam mitologi Yunani, dan ia juga telah dirangka sebagai Zuhal I.
Nama
Tolong bantu menterjemahkan sebahagian rencana ini. Rencana ini memerlukan kemaskini dalam Bahasa Melayu piawai Dewan Bahasa dan Pustaka. Sila membantu, bahan-bahan boleh didapati di Mimas (bulan) (Inggeris). Jika anda ingin menilai rencana ini, anda mungkin mahu menyemak di terjemahan Google. Walau bagaimanapun, jangan menambah terjemahan automatik kepada rencana, kerana ini biasanya mempunyai kualiti yang sangat teruk. Sumber-sumber bantuan: Pusat Rujukan Persuratan Melayu. |
Nama "Mimas" dan nama-nama kesemua tujuh satelit Zuhal yang diketahui telah dicadangkan oleh anak lelaki Herschel John Herschel dalam terbitan 1847 beliau Results of Astronomical Observations made at the Cape of Good Hope ([3])
Menurut terbitan Liddell dan Scott Greek-English Lexicon, bentuk adjektif Mimas/Mimans adalah Mimantean (kata namanya ialah Mimantis, Greek Μῑμάντις). Secara praktikalnya, peminjaman perkataan Inggeris seperti Mimasian dan Mimian kerap dilihat, tetapi selalunya penulis-penulis menggunakan frasa 'of Mimas'.
Ciri-ciri fizikal
Ketumpatan rendah Mimas (1.17) menandakan yang kebanyakan daripadanya terdiri daripada ais batu dengan sedikit amaun batu. Disebabkan tindakan kuasa pasang surut ke atasnya, bulan ini tidak sfera sepenuhnya; paksi terpanjangnya adalah 10% lebih panjang berbanding dengan paksi terpendeknya. Bentuk agak bujur telur Mimas jelas kelihatan dalam gambar-gambar terkini daripada kapal Cassini.
Mimas' most distinctive feature is a colossal impact crater 130 km across, named Herschel after the moon's discoverer. Herschel's diameter is almost a third of the moon's own diameter; its walls are approximately 5 km high, parts of its floor measure 10 km deep, and its central peak rises 6 km above the crater floor. If there were a crater of an equivalent scale on Earth it would be over 4,000 km in diameter, wider than Canada. The impact that made this crater must have nearly shattered Mimas: fractures can be seen on the opposite side of Mimas that may have been created by shock waves from the impact travelling through the moon's body.
The surface is saturated with smaller impact craters, but no others are anywhere near the size of Herschel. Although Mimas is heavily cratered, the cratering is not uniform. Most of the surface is covered with craters greater than 40 km in diameter, but in the south polar region, craters greater than 20 km are generally lacking. This suggests that some process removed the larger craters from these areas.
Scientists officially recognise two types of geological features on Mimas: craters and chasmata (chasms). See also: List of geological features on Mimas.
Mimas is responsible for clearing the material from the Cassini Division, the gap between Saturn's two widest rings, A Ring and B Ring.
Mimas dalam fiksyen dan filem
- Comparisons have been made between Mimas' appearance and the appearance of the Death Star from the movie Star Wars (see picture). The appearance is merely a coincidence, as Mimas was not photographed until three years after the release of the film; it was this similarity that led to Mimas sometimes being called "the Death Star moon".
- In the novels of Rob Grant and Doug Naylor based on their sitcom Red Dwarf, Mimas is the site of a large, congested spaceport where Dave Lister takes shore leave to get over being dumped by his girlfriend Kristine Kochanski, adopts a cat, escapes as a stowaway and begins his journey on the Red Dwarf. Both the book and the series refer to the local delicacy "Mimean Bladderfish".
- An episode of Star Trek: The Next Generation features Mimas as the site of an evacuation station to which four Starfleet cadets, including Wesley Crusher, transport after their vessels collide.
- In the 1958 novel Lucky Starr and the Rings of Saturn (one of Isaac Asimov's famous Lucky Starr juvenile space opera series, which were originally published under the pseudonym of Paul French) the hero, knowing that Mimas is almost entirely made of ice, guides his ship on a collision course toward it, melts its surface with his weapons, and thus hides the ship underwater in order to escape from his enemies, the people from the Sirius System.
Pautan luar
- Cassini mission page - Mimas
- Journal of raw images from Cassini
- The Planetary Society: Mimas
- The Nine Planets - Mimas
- Views of the Solar System - Mimas