19 Fortuna

19 Fortuna
Fortuna berada di tengah tepat di atas Nebula Kepiting
Penemuan
Ditemukan olehJohn Russell Hind
Tanggal penemuan22 Agustus 1852
Penamaan
Asal nama
Fortuna
A902 UG
Sabuk utama
Ciri-ciri orbit[1]
Epos 22 Oktober 2004 (Hari Julian 2453300,5)
Aphelion2,831 SA (423,443 Gm)
Perihelion2,052 SA (307,028 Gm)
2,441 SA (365,235 Gm)
Eksentrisitas0,159
3,81 a (1393,378 hr)
Kecepatan orbit rata-rata
18,94 km/dtk
268,398°
Inklinasi1,573°
211,379°
182,091°
Ciri-ciri fisik
Dimensi225 × 205 × 195 km[2]
225 km[3][4]
Massa1,27×1019 kg[2]
Massa jenis rata-rata
2,70±0,48 g/cm³[2]
~0,0629 m/s²
~0,1190 km/s
0,3101 hr (7,4432 jam)[1]
Albedo0,037[1]
Suhu~180 K
Pola spektrum
Asteroid tipe G[1]
8,88[5] hingga 12,95
7,13[1]
0,25" hingga 0,072"

19 Fortuna (/fɔːrˈtjuːnə/; bahasa Latin: Fortūna) adalah salah satu asteroid terbesar di sabuk utama. Fortuna memiliki komposisi yang hampir sama dengan 1 Ceres: permukaan yang berwarna gelap dengan komposisi senyawa organik primitif, termasuk tholin.

Fortuna berdiameter 225 km dan memiliki albedo geometrik paling gelap untuk asteroid dengan diameter lebih dari 150 km yang pernah diketahui. Albedo Fortuna telah diukur bernilai 0,028 dan 0,037.[6]

Teleskop luar angkasa Hubble telah mengamati Fortuna pada tahun 1993. Dari pengamatan itu diketahui diameter tampak dari Fortuna adalah 0,20 detik busur (4,5 piksel dalam Planetary Camera) dan bentuknya menyerupai bola. Satelit juga berusaha untuk dicari namun tidak terdeteksi.

Fortuna pernah dilaporkan menutupi bintang lain beberapa kali. Fortuna telah dipelajari dengan radar astronomi.[7]

Fortuna ditemukan oleh John Russell Hind pada 22 Agustus 1852 dan dinamai mengikuti Fortuna, dewi keberuntungan dalam mitologi Romawi.

Fortuna pernah diperturbasi oleh asteroid 80 km, 135 Hertha, dan awalnya diperkirakan memiliki massa 1,08×1019 kg oleh Baer pada perturbasi ini.[4] Perkiraan terkini menunjukan bahwa massa Fortuna adalah 1,27×1019 kg.[2]

Pada 21 Desember 2012 Fortuna (~200 km) akan berpapasan dengan asteroid 6,5Gm 687 Tinette.[8]

Referensi

  1. ^ a b c d e "JPL Small-Body Database Browser: 19 Fortuna". 2008-08-21. Diakses tanggal 2008-11-11. 
  2. ^ a b c d Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Diarsipkan dari versi asli tanggal 2013-10-21. Diakses tanggal 2008-11-27. 
  3. ^ Storrs, Alex (1998). "Imaging Observations of Asteroids with Hubble Space Telescope" (PDF). Icarus. 137 (2): 260–268. Bibcode:1999Icar..137..260S. doi:10.1006/icar.1999.6047. Diarsipkan dari versi asli (PDF) tanggal 2012-02-25. Diakses tanggal 2005-01-15. 
  4. ^ a b Baer, James (2008). "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris" (PDF). Celestial Mechanics and Dynamical Astronomy. Springer Science+Business Media B.V. 2007. 100 (2008): 27–42. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8. Diarsipkan dari versi asli (PDF) tanggal 2011-02-24. Diakses tanggal 2008-11-11. 
  5. ^ "AstDys (19) Fortuna Ephemerides". Department of Mathematics, University of Pisa, Italy. Diakses tanggal 2010-06-27. 
  6. ^ Storrs, Alex (2005). "A closer look at main belt asteroids 1: WF/PC images" (PDF). Icarus. 173 (2): 409–416. Bibcode:2005Icar..173..409S. doi:10.1016/j.icarus.2004.08.007. Diarsipkan (PDF) dari versi asli tanggal 2007-04-18. Diakses tanggal 2007-09-23. 
  7. ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Diakses tanggal 2011-10-30. 
  8. ^ Generated with Solex 10 Diarsipkan 2008-12-20 di Wayback Machine. by Aldo Vitagliano

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