Hydra (satelit)

Hydra
	Gambar berwarna yang disempurnakan dari Hydra, diambil oleh New Horizons.
Penemuan
Ditemukan oleh	Hubble Space Telescope; Pluto Companion Search Team
Tanggal penemuan	15 Juni 2005
Penamaan
Pelafalan	/ˈhaɪdrə/
Asal nama	Lernaean Hydra
Nama alternatif	S/2005 P 1, P1, Pluto III
Kata sifat bahasa Inggris	Hydrian
Ciri-ciri orbit
Sumbu semimayor	64.738±3 km
Eksentrisitas	0,005862±0,000025
Periode orbit	38,20177±0,00003 h
Inklinasi	0,242°±0,005°
Satelit dari	Pluto
Ciri-ciri fisik
Dimensi	50,9 km × 36,1 km × 30,9 km
Massa	(4,8±4,2)×1016 kg
Massa jenis rata-rata	2,13 g/cm3
Gravitasi permukaan	0,00520055269 g
Periode rotasi	0.4295 ± 0.0008 h (semrawut)
Kemiringan sumbu	110°
Albedo	0.83 ± 0.08 (geometris)
Suhu	23 K
Magnitudo semu	22.9–23.3

Hydra adalah sebuah satelit alami terluar dikenal dari Pluto. Hal ini ditemukan bersama dengan Nix pada bulan Juni 2005, dan untuk dikunjungi bersama dengan Pluto dengan misi New Horizons pada bulan Juli 2015.

Hydra ditemukan oleh Hubble Space Telescope's Pluto Companion Search Team, yang terdiri dari A. Hal Weaver, Alan Stern, Max J. Mutchler, Andrew J. Steffl, Marc Buie W., William J. Merline, John R. Spencer, Eliot F. Young, dan Leslie A. Young. Gambar Penemuan diambil pada tanggal 15 Mei 2005 dan 18 Mei 2005; Nix dan Hydra secara independen ditemukan oleh Max J. Mutchler pada tanggal 15 Juni 2005, dan Andrew J. Steffl pa8da 15 Agustus 2005. Penemuan diumumkan pada tanggal 31 Oktober 2005, setelah konfirmasi oleh precoveries dari tahun 2002. Mereka untuk sementara ditunjuk S/2005 P1 (Hydra) dan S/2005 P2 (Nix).

Referensi[sunting | sunting sumber]

^ Jennifer Blue (11 September 2009). "Gazetteer of Planetary Nomenclature". IAU Working Group for Planetary System Nomenclature (WGPSN).
^ Showalter, M. R.; Hamilton, D. P. (3 June 2015). "Resonant interactions and chaotic rotation of Pluto's small moons". Nature. 522 (7554): 45–49. Bibcode:2015Natur.522...45S. doi:10.1038/nature14469. PMID 26040889.
^ ^a ^b Verbiscer, A. J.; Porter, S. B.; Buratti, B. J.; Weaver, H. A.; Spencer, J. R.; Showalter, M. R.; Buie, M. W.; Hofgartner, J. D.; Hicks, M. D.; Ennico-Smith, K.; Olkin, C. B.; Stern, S. A.; Young, L. A.; Cheng, A. (2018). "Phase Curves of Nix and Hydra from the New Horizons Imaging Cameras". The Astrophysical Journal. 852 (2): L35. doi:10.3847/2041-8213/aaa486.
^ ^a ^b ^c Stern, S. A.; Bagenal, F.; Ennico, K.; Gladstone, G. R.; et al. (15 October 2015). "The Pluto system: Initial results from its exploration by New Horizons". Science. 350 (6258): aad1815. arXiv:1510.07704 . Bibcode:2015Sci...350.1815S. doi:10.1126/science.aad1815. PMID 26472913.
^ "Hydra By the Numbers". solarsystem.nasa.gov. NASA. Diakses tanggal 7 March 2019.
(Original value of 0,051 m/s² converted to g)
^ Weaver, H. A.; Buie, M. W.; Showalter, M. R.; Stern, S. A.; et al. (18 April 2016). "The Small Satellites of Pluto as Observed by New Horizons". Science. 351 (6279): aae0030. arXiv:1604.05366 . Bibcode:2016Sci...351.0030W. doi:10.1126/science.aae0030. PMID 26989256.
^ Cook, Jason C.; Dalle Ore, Cristina M.; Protopapa, Silvia; Binzel, Richard P.; Cartwright, Richard; Cruikshank, Dale P.; et al. (15 November 2018). "Composition of Pluto's small satellites: Analysis of New Horizons spectral images". Icarus. 315: 30–45. Bibcode:2017LPI....48.2478C. doi:10.1016/j.icarus.2018.05.024. Diakses tanggal 27 June 2019.
^ Stern, S. A.; Mutchler, M. J.; Weaver, H. A.; Steffl, A. J. (2006). "The Positions, Colors, and Photometric Variability of Pluto's Small Satellites from HST Observations 2005–2006". Astronomical Journal. 132 (3): 1405–1414. arXiv:astro-ph/0607507 . Bibcode:2006AJ....132.1405S. doi:10.1086/506347. (Final preprint)

Pranala luar[sunting | sunting sumber]

Hydra Profile Diarsipkan 2007-08-01 di Wayback Machine. by NASA's Solar System Exploration
NASA's Hubble Reveals Possible New Moons Around Pluto – Hubble press release
Two More Moons Discovered Orbiting Pluto (SPACE.com)
Pluto's Newest Moons Named Hydra and Nix (SPACE.com)
Hydra at ESA/Hubble Diarsipkan 2007-01-14 di Wayback Machine.

[Nomenclature-1] Jennifer Blue (11 September 2009). "Gazetteer of Planetary Nomenclature". IAU Working Group for Planetary System Nomenclature (WGPSN).

[ShowalterHamilton2015-2] Showalter, M. R.; Hamilton, D. P. (3 June 2015). "Resonant interactions and chaotic rotation of Pluto's small moons". Nature. 522 (7554): 45–49. Bibcode:2015Natur.522...45S. doi:10.1038/nature14469. PMID 26040889.

[phasecurves-3] Verbiscer, A. J.; Porter, S. B.; Buratti, B. J.; Weaver, H. A.; Spencer, J. R.; Showalter, M. R.; Buie, M. W.; Hofgartner, J. D.; Hicks, M. D.; Ennico-Smith, K.; Olkin, C. B.; Stern, S. A.; Young, L. A.; Cheng, A. (2018). "Phase Curves of Nix and Hydra from the New Horizons Imaging Cameras". The Astrophysical Journal. 852 (2): L35. doi:10.3847/2041-8213/aaa486.

[scimag000-4] Stern, S. A.; Bagenal, F.; Ennico, K.; Gladstone, G. R.; et al. (15 October 2015). "The Pluto system: Initial results from its exploration by New Horizons". Science. 350 (6258): aad1815. arXiv:1510.07704 . Bibcode:2015Sci...350.1815S. doi:10.1126/science.aad1815. PMID 26472913.

[by-the-numbers-5] "Hydra By the Numbers". solarsystem.nasa.gov. NASA. Diakses tanggal 7 March 2019.
(Original value of 0,051 m/s² converted to g)

[arxiv1604-6] Weaver, H. A.; Buie, M. W.; Showalter, M. R.; Stern, S. A.; et al. (18 April 2016). "The Small Satellites of Pluto as Observed by New Horizons". Science. 351 (6279): aae0030. arXiv:1604.05366 . Bibcode:2016Sci...351.0030W. doi:10.1126/science.aae0030. PMID 26989256.

[Cook2018-7] Cook, Jason C.; Dalle Ore, Cristina M.; Protopapa, Silvia; Binzel, Richard P.; Cartwright, Richard; Cruikshank, Dale P.; et al. (15 November 2018). "Composition of Pluto's small satellites: Analysis of New Horizons spectral images". Icarus. 315: 30–45. Bibcode:2017LPI....48.2478C. doi:10.1016/j.icarus.2018.05.024. Diakses tanggal 27 June 2019.

[Stern06b-8] Stern, S. A.; Mutchler, M. J.; Weaver, H. A.; Steffl, A. J. (2006). "The Positions, Colors, and Photometric Variability of Pluto's Small Satellites from HST Observations 2005–2006". Astronomical Journal. 132 (3): 1405–1414. arXiv:astro-ph/0607507 . Bibcode:2006AJ....132.1405S. doi:10.1086/506347. (Final preprint)

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l b s Objek trans-Neptunus
Kelas OTN	Cubewano Objek piringan tersebar Objek lepas Objek resonan Troya Neptunus Plutino Twotino) Satelit alami Objek ganda
Plutoid & satelit	Pluto Charon (Pluto I) Nix (Pluto II) Hydra (Pluto III) Kerberos (Pluto IV) Styx (Pluto V) Haumea Hi'iaka (Haumea I) Namaka (Haumea II) Makemake Eris Dysnomia (Eris I)
Sednoid	90377 Sedna 2012 VP113