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| <!-- Additional parameters for this template are available at [[Template:Infobox Planet]]. -->
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| {{Infobox planet
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| | discovery=yes
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| | physical_characteristics = yes
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| | bgcolour=#FFFFC0
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| | name=6 Hebe
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| | symbol= [[Image:6 Hebe Astronomical Symbol.svg|30px]]
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| | discoverer=[[Karl Ludwig Hencke]]
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| | discovered=July 1, 1847
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| | image=
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| | alt_names=1947 JB
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| | pronounced = {{IPAc-en|ˈ|h|iː|b|iː}} {{Respell|HEE|bee}}
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| | adjectives = Hebean
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| | named_after = [[Hebe (mythology)|Hēbē]]
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| | mp_category=[[Main belt]]
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| | epoch=November 26, 2005 ([[Julian day|JD]] 2453700.5)
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| | semimajor=2.426 AU (362.851 Gm)
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| | perihelion=1.937 AU (289.705 Gm)
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| | aphelion=2.914 [[Astronomical unit|AU]] (435.996 Gm)
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| | eccentricity=0.202
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| | period=3.78 [[Julian year (astronomy)|a]] (1379.756 d)
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| | inclination=14.751°
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| | asc_node=138.752°
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| | arg_peri=239.492°
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| | mean_anomaly=247.947°
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| | avg_speed=18.93 km/s
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| | p_orbit_ref = <ref name=Hebe-POE>{{cite web
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| |title=AstDyS-2 Hebe Synthetic Proper Orbital Elements
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| |publisher=Department of Mathematics, University of Pisa, Italy
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| |url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.6&n=6
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| |accessdate=2011-10-01}}</ref>
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| | p_semimajor = 2.4252710
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| | p_eccentricity = 0.1584864
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| | p_inclination = 14.3511092°
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| | p_mean_motion = 95.303184
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| | perihelion_rate = 31.568209
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| | node_rate = −41.829042
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| | dimensions=205×185×170 km<ref name=Baer/><ref name=IRAS>[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab Supplemental IRAS Minor Planet Survey]</ref><ref name=Torppa2003>[http://www.rni.helsinki.fi/~mjk/thirty.pdf J. Torppa et al. ''Shapes and rotational properties of thirty asteroids from photometric data''], Icarus, Vol. 164, p. 346 (2003).</ref><br>186 km ([[Geometric mean|mean]])
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| | mass=1.28{{e|19}} kg<ref name=Baer>{{Cite web
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| |year=2008
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| |title=Recent Asteroid Mass Determinations
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| |publisher=Personal Website
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| |author=Jim Baer
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| |url=http://home.earthlink.net/~jimbaer1/astmass.txt
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| |accessdate=2008-11-28}}</ref>
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| | density=3.81±0.26 g/cm³<ref name=Baer/>
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| | surface_grav=~0.087 m/s<sup>2</sup>
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| | escape_velocity=~0.13 km/s
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| | rotation=0.3031 d<ref>[http://www.psi.edu/pds/archive/lc.html Planetary Data System Small Bodies Node, lightcurve parameters]</ref>
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| | spectral_type=[[S-type asteroid]]
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| | magnitude = 7.5<ref name="Pasachoff1983">{{Cite book| author=Donald H. Menzel and Jay M. Pasachoff | year=1983 | title=A Field Guide to the Stars and Planets | edition=2nd edition | publisher=Houghton Mifflin | pages=391 | location=Boston, MA | isbn=0-395-34835-8 }}</ref> to 11.50
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| | abs_magnitude=5.71
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| | albedo=0.268 ([[geometric albedo|geometric]])<ref name=IRAS />
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| | angular_size = 0.26" <!-- Horizons 2010-Sep-20 --> to 0.065"
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| | single_temperature=~170 [[kelvin|K]] <br>''max:'' ~269 K (-4°C)
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| }}
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| '''6 Hebe''' ({{IPAc-en|ˈ|h|iː|b|iː}} {{Respell|HEE|bee}}) is a large [[main-belt]] [[asteroid]], containing around half a percent of the mass of the belt. Its apparently high bulk density (greater than that of the Earth's [[Moon]] or even [[Mars]]), however, means that by volume it does not rank among the top twenty asteroids. This high bulk density suggests an extremely solid body that has not been impacted by collisions, which is not typical of asteroids of its size – they tend to be loosely bound [[rubble pile]]s.
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| In [[apparent magnitude|brightness]], Hebe is the fifth brightest object in the asteroid belt after [[4 Vesta|Vesta]], [[Ceres (dwarf planet)|Ceres]], [[7 Iris|Iris]] and [[2 Pallas|Pallas]]. It has a mean opposition magnitude of +8.3, about equal to the mean brightness of [[Titan (moon)|Titan]]<ref>[http://jas.org.jo/ast.html The Brightest Asteroids]</ref> and can reach +7.5 at an opposition near perihelion.
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| Hebe is probably the parent body of the [[H chondrite]] meteorites, which account for a remarkable 40% of all [[meteorite]]s striking the Earth.
| | Gain access to it in excel, copy-paste this continued plan easily into corpuscle B1. An individual again access an majority of time in abnormal in about corpuscle A1, the muscle size in treasures will come to the forefront in B1.<br><br>Maintain a video game great. These can be a lot on fun for you and your own gaming friends. Either you do this online, in the house or at a pals place. Serve amazing snacks and get several people as you can possibly involved. This numerous way to enjoy your own game playing with buddies.<br><br>Throne Rush has an exact same for just about everything in Clash. Instead of their Town Hall, it features a Castle. Instead of Clans, it has Brotherhoods. Instead of Trophies, it has Morale. Perhaps the one [http://www.tumblr.com/tagged/element element] it takes to the next step is its Immortal Personalities. clash of clans has a Barbarian King and an Archer Queen which are special units that can be reused in battle inch they just require a long of time to stop back to full wellness. Throne Rush has similar heroes that can be hired, but they will extreme and more many. They play almost the same way, nevertheless i think players will reminisce about using four or seven Immortal Heroes instead associated just two, as for an extended time as they dont throw off the balance of sport too severely.<br><br>Gaming programs are fun, nonetheless could be recommended also be costly. The costs of gaming and consoles can set you back more than many people would normally choose those to be, but this may be easily eliminated.<br><br>You might be looking Conflict of Tourists Jewels Free, or your are just buying a Endanger Conflict of Tribes, currently has the smartest choice on your internet, absolutely free as well as only takes a short while to get all these products.<br><br>A person are the proud owner of an ANY compact device that runs on the topic of iOS or android whenever a touchscreen tablet computing device or a smart phone, then you definitely may possibly have already been very careful of the revolution carrying place right now a world of mobile digital game "The Clash In Clans", and you ought to be in demand pointing to conflict of families fully free jewels compromise because a lot of gems, elixir and gold are needed seriously toward acquire every battle.<br><br>As your village grows, the to explore uncharted areas for Gold and Woodgrain effect which are the 2 key resources you might expect to require when it comes to start of the video games ( addititionally there happens to be Stone resource, that your entire family discover later inside currently the game ). If you have any inquiries about wherever and how to use [http://prometeu.net clash of clans hack android], you can call us at our web site. Due to your exploration, you can expect to stumble entirely on many islands whereby a person's villages happen to be held captive under BlackGuard slavery and you results from free Gold ammenities if they are vacant. |
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| ==Discovery==
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| [[Image:Moon and Asteroids 1 to 10.svg|thumb|left|Size comparison: the first 10 asteroids profiled against Earth's [[Moon]]. Hebe is sixth from the left.]]
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| Hebe was the sixth [[asteroid]] to be discovered, on July 1, 1847 by [[Karl Ludwig Hencke]]. It was the second and final asteroid discovery by Hencke, who had previously found [[5 Astraea]]. The name ''[[Hebe (mythology)|Hebe]]'', goddess of youth, was proposed by [[Carl Friedrich Gauss]].
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| ==Major meteorite source==
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| '''6 Hebe''' is the probable parent body of the [[H chondrite]] [[meteorite]]s and the [[IIE iron meteorite]]s.
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| [[Image:HebeOrbit.png|left|thumb|270px|The orbit of 6 Hebe compared with the orbits of Earth, Mars and Jupiter]]
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| Remarkably, this would imply that it is the source of about 40% of all meteorites striking the Earth. Evidence for this connection includes the following (after Michael Gaffey and Sarah L. Gilbert.<ref name=GaffeyGilbert>[http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1998M%26PS...33.1281G&db_key=AST&data_type=HTML&format=&high=438c93072f28336 M. J. Gaffey & S. L. Gilbert ''Asteroid 6 Hebe: The probable parent body of the H-Type ordinary chondrites and the IIE iron meteorites''], Meteoritics & Planetary Science, Vol. 33, p. 1281 (1998).</ref>):
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| * The spectrum of Hebe matches a mix of 60% H chondrite and 40% IIE iron meteorite material.
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| * The IIE type are unusual among the iron meteorites, and probably formed from impact melt, rather than being fragments of the core of a [[planetary differentiation|differentiated]] asteroid.
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| * The IIE irons and H chondrites likely come from the same parent body, due to similar trace mineral and oxygen [[isotope]] ratios.
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| * Asteroids with spectra similar to the [[ordinary chondrite]] meteorites (accounting for 85% of all falls, including the H chondrites) are extremely rare.
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| * 6 Hebe is extremely well placed to send impact debris to Earth-crossing orbits. Ejecta with even relatively small velocities (~280 m/s) can enter the chaotic regions of the 3:1 [[Kirkwood gap]] at 2.50 [[astronomical unit|AU]] and the nearby <math>\nu_6\,\!</math> [[secular resonance]] which determines the high-inclination edge of the [[asteroid belt]] at about 16° [[inclinations]] hereabouts.
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| * Of the asteroids in this "well-placed" orbit, Hebe is the largest.
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| * An analysis of likely contributors to the Earth's meteorite flux places 6 Hebe at the top of the list,<ref name=Morbidelli1994>[http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1994A%26A...282..955M&data_type=PDF_HIGH&type=PRINTER&filetype=.pdf A. Morbidelli et al. ''Delivery of meteorites through the ν<sub>6</sub> secular resonance''], Astronomy & Astrophysics, Vol. 282, p. 955 (1994).</ref> due to its position and relatively large size. ''If Hebe is not the H-chondrite parent body, then where are the meteorites from Hebe?''<ref name=GaffeyGilbert />
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| ==Physical characteristics==
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| Lightcurve analysis suggests that Hebe has a rather angular shape, which may be due to several large impact craters.<ref name=Torppa2003 /> Hebe rotates in a [[prograde and retrograde motion|prograde]] direction, with the north pole pointing towards [[ecliptic coordinate system|ecliptic coordinates]] (β, λ) = (45°, 339°) with a 10° uncertainty.<ref name=Torppa2003 /> This gives an [[axial tilt]] of 42°.
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| It has a bright surface and, if its identification as the parent body of the H chondrites is correct, a
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| surface composition of [[silicate]] [[chondritic]] rocks mixed with pieces of [[nickel]]-[[iron]] [[metal]]. A likely scenario for the formation of the surface metal is as follows:
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| # Large impacts caused local melting of the iron rich H chondrite surface. The metals, being heavier, would have settled to the bottom of the magma lake, forming a metallic layer buried by a relatively shallow layer of silicates.
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| # Later sizeable impacts broke up and mixed these layers.
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| # Small frequent impacts tend to preferentially pulverize the weaker rocky debris, leading to an increased concentration of the larger metal fragments at the surface, such that they eventually comprise ~40% of the immediate surface at the present time.
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| ==Moon==
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| On March 5, 1977 Hebe [[occultation|occulted]] Kaffaljidhma ([[Gamma Ceti|γ Ceti]]), a moderately bright 3rd [[apparent magnitude|magnitude]] [[star]]. No other observed occultations by Hebe have been reported.
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| As a result of that occultation, a small Hebean [[natural satellite|moon]] was reported by [[Paul D. Maley]].<ref>[http://www.johnstonsarchive.net/astro/asteroidmoonsq.html W. R. Johnston ''Other reports of Asteroid/TNO Companions]</ref> It was nicknamed "Jebe" (see [[Heebie-jeebies (idiom)|Heebie Jeebies]]). This is the first modern day suggestion that asteroids have satellites. It was 17 years later when the first asteroid moon was formally discovered (Dactyl, the satellite of Ida.) However, the discovery of Hebe's moon has not been confirmed.
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| {{Clear}}
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| ==References==
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| <references/>
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| ==External links==
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| * [http://www.rni.helsinki.fi/~mjk/thirty.pdf shape model deduced from lightcurve]
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| * [http://adsabs.harvard.edu//full/seri/MNRAS/0007//0000283.000.html MNRAS '''7''' (1847) 283] (discovery announcement)
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| * [http://adsabs.harvard.edu//full/seri/MNRAS/0008//0000104.000.html MNRAS '''8''' (1848) 103]
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| * [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=6 JPL Ephemeris]
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| {{MinorPlanets Navigator|5 Astraea|7 Iris}}
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| {{MinorPlanets_Footer}}
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| {{DEFAULTSORT:Hebe}}
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| [[Category:Main Belt asteroids]]
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| [[Category:Asteroids named from Greek mythology]]
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| [[Category:S-type asteroids]]
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| [[Category:Astronomical objects discovered in 1847]]
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