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Encyclopedia > Hydra (moon)
Hydra

Artist conception of Hydra (foreground),
Pluto & Charon (background),
and Nix (bright dot center left)
Discovery
Discovered by Hubble Space Telescope
Pluto Companion Search Team
Discovered in June 2005
Orbital characteristics
Semi-major axis 64 780 ± 90 km
Eccentricity 0.005 ± 0.001
Orbital period 38.206 ± 0.001 d
Inclination 0.22° ± 0.12° (to Pluto's equator)
Is a satellite of Pluto
Physical characteristics
Mean diameter 44-50 km (based on assumed albedo)
Mass < 5×1018 kg
Mean density  ?
Rotation period  ?
Axial tilt  ?
Albedo 0.35 (assumed)
Surface temp. 33-55 K
Atmosphere none

Hydra (formerly known as S/2005 P 1) is a natural satellite of Pluto. It is one of two discovered in June 2005 by the Hubble Space Telescope's Pluto Companion Search Team, which is composed of Hal A. Weaver, Alan Stern, Max J. Mutchler, Andrew J. Steffl, Marc W. Buie, William J. Merline, John R. Spencer, Eliot F. Young, and Leslie A. Young. The discovery images were taken on on May 15 and May 18, 2005; the moons were first spotted by Max J. Mutchler on June 15 and the discoveries were announced, once confirmed by other observations and precoveries, on October 31. Image File history File linksMetadata Download high resolution version (4000x3000, 1051 KB)The artists concept above shows the Pluto system from the surface of one of the candidate moons. ... The Hubble Space Telescope (HST) is a telescope in orbit around the Earth. ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... The semi-major axis of an ellipse In geometry, the term semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae. ... A kilometre (American spelling: kilometer), symbol: km is a unit of length in the metric system equal to 1000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... Moons of solar system scaled to Earths Moon A natural satellite is a moon (not capitalized), that is, any natural object that orbits a planet. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... Diameter is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. ... Mass is a property of a physical object that quantifies the amount of matter and energy it contains. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... On a prograde planet like the Earth, the sidereal day is shorter than the solar day. ... Axial tilt is an astronomical term regarding the inclination angle of a planets rotational axis in relation to its orbital plane. ... Albedo is the measure of reflectivity of a surface or body. ... Temperature is also the name of a song by Sean Paul. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... Atmosphere is the general name for a layer of gases that may surround a material body of sufficient mass. ... Moons of solar system scaled to Earths Moon A natural satellite is a moon (not capitalized), that is, any natural object that orbits a planet. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... The Hubble Space Telescope (HST) is a telescope in orbit around the Earth. ... This page may meet Wikipedias criteria for speedy deletion. ... Marc W. Buie is an American astronomer. ... Precovery is a term used in astronomy that describes the process of finding the image of an object (usually a minor planet) in old archived images or photographic plates, for the purpose of calculating a more accurate orbit. ...


The satellite orbits the barycenter of the system in the same plane as Charon and Nix, at a distance of about 65,000 km. Unlike other satellites of Pluto, its orbit is only nearly circular; its eccentricity of 0.0052 is small, but significantly non-zero. The orbital period is 38.2 days, which misses being a 1:6 orbital resonance with Charon by only 0.3 percent. It is thought that this near-resonance originated in the outward migration of Charon after the formation of all three moons, and is maintained by a periodic local fluctuation of 15 percent in the Pluto-Charon gravitational field. It has been suggested that Center of gravity be merged into this article or section. ... Media:Example. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... In celestial mechanics, an orbital resonance occurs when two orbiting bodies exert a regular, periodic gravitational influence on each other. ...

Discovery images of S/2005 P 1.
Discovery images of S/2005 P 1.

Although its size has not been directly measured, calculations based on its brightness give it a diameter of between 44-50 km, if its reflectivity is similar to Charon's 35 percent, and between 130-150 km, if it has a reflectivity of 4 percent like the darkest KBOs. All of Pluto's moons are spectrally neutral, however, so the lower end of the range seems likely. At the time of discovery, Hydra was about 25 percent brighter than its sister moon Nix, which led to the assumption that its diameter was some 10 percent larger. However, in subsequent observations the two moons were about equal in brightness. This variation may be due either to albedo variations in P1's surface or to an oblong shape. Image File history File links Pluto_system_2005_discovery_images. ... Image File history File links Pluto_system_2005_discovery_images. ... Albedo is the measure of reflectivity of a surface or body. ... In most modern usages of the word spectrum, there is a unifying theme of between extremes at either end. ...


The moon is to be visited along with Pluto by the New Horizons mission in 2015. New Horizons is a NASA unmanned mission to fly by Pluto and its moons. ... 2015 (MMXV) will be a common year starting on Thursday of the Gregorian calendar. ...


S/2005 P 1 was nicknamed "Baltimore" by its discoverers. The formal name Hydra (named after Hydra, the monster that guarded Pluto's underworld in Greek mythology) was announced on June 21, 2006, in IAU Circular 8723, the designation Pluto III was also given. It should not be confused with the similarly-named asteroid 21290 Vydra. The 16th-century German illustrator has been influenced by the Beast of Revelation in his depiction of the Hydra. ... This article or section does not cite its references or sources. ... Pluto is an alternate name for the Greek god Hades, but was more often used in Roman mythology in their presentation of the god of the underworld. ... In Greek mythology, the underworld indicate the kingdom of deaths. ... // Greek mythology consists in part in a large collection of narratives that explain the origins of the world and detail the lives and adventures of a wide variety of gods, goddesses, heroes, and heroines. ... June 21 is the 172nd day of the year (173rd in leap years) in the Gregorian calendar, with 193 days remaining. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ...


External links

References

  • Steffl A.J., Mutchler M.J., Weaver H.A., Stern S.A., Durda D.D., Terrell D., Merline W.J., Young L.A., Young E.F., Buie M.W., Spencer J.R. (2005), New Constraints on Additional Satellites of the Pluto System, Astronomical Journal, submitted (preprint)
  • Buie M.W., Grundy W.M., Young, E.F., Young L.A., Stern S.A. (2005), Orbits and photometry of Pluto's satellites: Charon, S/2005 P1 and S/2005 P2, submitted (preprint)


Satellites of Pluto
Charon · Nix · Hydra
See also : Pronunciation key


The planet Pluto has three known moons. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... Media:Example. ...

Trans Neptunian Objects [edit ]
Planet : Pluto | 2003 UB313

Plutino : Pluto* | 1993 RO | 1993 RP | 1993 SB | 1993 SC | 1994 TB | 1995 QZ9 | 1996 SZ4 | 1996 TP66 | 38083 Rhadamanthus | 38628 Huya | 28978 Ixion | 2003 VS2 | 90482 Orcus A trans-Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. ... A planet is generally considered to be a relatively large mass of accreted matter in orbit around a star. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... 2003 UB313 is a trans-Neptunian object (TNO) believed to be larger than the planet Pluto. ... In astronomy, a plutino is a trans-Neptunian object that has a 3:2 orbital resonance with Neptune. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... 1993 RO is a trans-Neptunian object of the Plutino class. ... (15788) 1993 SB is a trans-Neptunian object of the Plutino class. ... 38083 Rhadamanthus (formerly known as (38083) 1999 HX11) is a trans-Neptunian object. ... 38628 Huya (original provisional designation: 2000 EB173) is a trans-Neptunian object. ... (28978) Ixion (ik·sye·un) is a Kuiper belt object discovered on May 22, 2001 with a diameter of < 822 km and a semimajor axis of about 39. ... 90482 Orcus (originally known by the provisional designation 2004 DW) is a Kuiper Belt object (KBO) that was discovered by Michael Brown of Caltech, Chad Trujillo of the Gemini Observatory, and David Rabinowitz of Yale University. ...


Cubewanos: 1992 QB1 | 1994 GV9 | 1994 JQ1 | 1994 VK8 | 1996 TO66 | 19521 Chaos | 53311 Deucalion | 2002 AW197 | 50000 Quaoar | 2002 MS4 | 2002 TX300 | 2002 UX25 | 2003 AZ84 | 2003 EL61 | 2003 QW90 | 2005 FY9 A cubewano is a Kuiper belt object, orbiting beyond Pluto and not controlled by resonances with Neptune. ... (15760) 1992 QB1 (also written (15760) 1992 QB1) was the first trans-Neptunian object to be discovered after Pluto and Charon. ... (19308) 1996 TO66 (also written (19308) 1996 TO66) is a trans-Neptunian object. ... 19521 Chaos (1998 WH24) is a cubewano, a Kuiper belt object not in resonance with any planet. ... 53311 Deucalion (original provisional designation: 1999 HU11) is a trans-Neptunian object. ... (55565) 2002 AW197 (also written: (55565) 2002 AW197) is a trans-Neptunian object. ... Artists impression by G. Bacon of STScI / NASA 50000 Quaoar (pronounced kwah·war, kwah·wor, or kwow·ur, Tongva ) [1] is a Trans-Neptunian object orbiting the Sun in the Edgeworth-Kuiper belt. ... The correct title of this article is (55636) 2002 TX300. ... The correct title of this article is (55637) 2002 UX25. ... 2003 EL61 (also written 2003 EL61), nicknamed Santa (non-official designation), is a large and very unusual Kuiper belt object discovered by Mike Brown at Caltech in the United States. ... 2005 FY9 (also written 2005 FY9), codenamed Easterbunny by its discoverers, is a very large Kuiper belt object discovered on March 31, 2005 by the team led by Michael Brown. ...


Twotino: 1996 TR66 | 1998 SM165 | 1997 SZ10 | 1999 RB216 | 2000 JG81 While a Plutino completes 2 orbits around the Sun in the time it takes Neptune to complete 3 orbits, a Twotino makes 1 orbit around the Sun in the time it takes Neptune to complete 2 orbits. ...


Scattered disk object: 1995 TL8 | 1996 GQ21 | 1996 TL66 | 2000 OO67 | 2000 OM67 | 2001 KC77 | 2001 UR163 | 2002 CY224 | 2002 GX32 | 2003 UB313** A scattered disk object (or scattered disc object or SDO) is a trans-Neptunian object of the Kuiper belt with a very eccentric orbit. ... (48639) 1995 TL8 (also written (48639) 1995 TL8) is a trans-Neptunian object of the Scattered disk object subclass, and posesses a very large satellite. ... (15874) 1996 TL66 is a trans-Neptunian object that resides in the Kuyper belt. ... 2000 OO67 is a Trans Neptunian Object notable for its highly eccentric orbit. ... 2003 UB313 is a trans-Neptunian object (TNO) believed to be larger than the planet Pluto. ...


Unclassified Objects : 1994 JS | 1994 JR1 | 1995 DA2 | 1995 SM55 | 1996 TQ66 | 1997 CR29 | 1997 CS29 | 1997 CQ29 | 1997 CU29 | 1997 QJ4 | 1998 HJ151 | 1998 HK151 | 1998 HP151 | 1998 HM151 | 1998 KR65 | 1998 SM165 | 1998 SN1651998 US43 | 1998 VG44 | 1998 WW24 | 1998 WA31 | 1998 WU31 | 1998 WW31 | 1998 WA25 | 1999 CP133 | 1999 CL158 | 1999 CC158 | 1999 DF9 | 1999 HT11 | 1999 HB12 | 1999 HC12 | 1999 KR16 | 1999 OY3 1998 WW31 (also written 1998 WW31) is an object of the solar system located beyond the orbit of Neptune. ...


Natural satellites : Charon (Pluto) | S/2000 (1998 WW31) 1 | S/2005 (2003 EL61) 1 | S/2005 (2003 EL61) 2 | Hydra (Pluto) | Nix (Pluto) | S/2005 (2003 UB313) 1-1... Media:Example. ... 1998 WW31 (also written 1998 WW31) is an object of the solar system located beyond the orbit of Neptune. ... S/2005 (2003 UB313) 1 is a moon around the cubewano Kuiper Belt trans-Neptunian object 2003 UB313, the presumed tenth planet of our Solar System. ...


 
 

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