Thebe (satelit)

Thebe
Gambar yang diambil oleh wahana Galileo pada tanggal 4 Januari 2000
Penemuan
Ditemukan olehStephen P. Synnott / Voyager 1
Tanggal penemuan5 Maret 1979
Penamaan
Kata sifat bahasa InggrisThebean
Ciri-ciri orbit
Periapsis218.000 km[a]
Apoapsis226.000 km[b]
Jari-jari orbit rata-rata
221.889,0±0,6 km (3.11 RJ)[1]
Eksentrisitas0,0175±0,0004[1]
0,674536±0,000001 h (16 jam 11.3 menit)[1]
Kecepatan orbit rata-rata
23,92 km/s (dihitung)
Inklinasi1,076°±0,003° (to Jupiter's equator)[1]
Satelit dariJupiter
Ciri-ciri fisik
Dimensi116 × 98 × 84 km[2]
Jari-jari rata-rata
49,3±2,0 km[2]
Volume≈ 500.000 km3
0,013 m/s2 (0,004 g)[2][c]
20–30m/s[3][d]
sinkron
0
Albedo0,047±0,003[4]
Suhu≈ 124 K

Thebe (bahasa Yunani: Θήβη), yang juga dikenal sebagai Jupiter XIV, yang sebelumnya bernama S/1979 J 2, adalah satelit Jupiter keempat terdekat berdasarkan jaraknya ke Planet Jupiter. Thebe ditemukan oleh Stephen P. Synnott dalam gambar-gambar yang diambil oleh Voyager 1 pada tanggal 5 Maret 1979 saat melintasi Jupiter.[5] Pada tahun 1983, satelit ini diberi nama secara resmi berdasarkan nimfa mitologis, Thebe.[6]

Menjadi satelit kedua terbesar dari kelompok satelit dalam Jupiter, Thebe mengorbit di tepi luar cincin gossamer Thebe yang terbentuk dari debu yang dilepaskan dari permukaan Thebe.[3] Thebe berbentuk tidak beraturan dan berwarna kemerahan, dan Thebe, diperkirakan seperti Amalthea, terdiri dari es air berpori dengan sejumlah materi lain yang tidak diketahui. Wajah permukaan Thebe didominasi oleh kawah besar dan gunung tinggi, dan beberapa di antaranya bahkan sebanding dengan ukuran satelit itu sendiri.[2]

Thebe difoto pertama kali pada tahun 1979 oleh wahana Voyager 1 dan 2, dan kemudian secara lebih mendetail oleh orbiter Galileo pada tahun 1990-an.[2]

Bersama Thebe, Jupiter untuk saat ini diketahui memiliki 79 satelit.

Referensi

Catatan

  1. ^ Dihitung sebagai a×(1 − e), di mana a adalah sumbu semi-mayor dan e adalah eksentrisitas.
  2. ^ Dihitung sebagai a×(1 + e), di mana a adalah sumbu semi-mayor dan e adalah eksentrisitas.
  3. ^ Perkiraan dari Thomas, 1998 yang dibagi dengan 1,5 untuk menjelaskan perbedaan dalam kepadatan yang diasumsikan.
  4. ^ Perkiraan dari Burns, 2004 yang dibagi dengan 1,5 untuk menjelaskan perbedaan dalam kepadatan yang diasumsikan.

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