Quadratic sieve: Difference between revisions

From formulasearchengine
Jump to navigation Jump to search
en>ZéroBot
 
Line 1: Line 1:
<!-- Additional parameters for this template  are available at [[Template:Infobox Planet]]. -->
{{Infobox planet
| discovery=yes
| physical_characteristics = yes
| bgcolour=#FFFFC0
| name=6 Hebe
| symbol= [[Image:6 Hebe Astronomical Symbol.svg|30px]]
| discoverer=[[Karl Ludwig Hencke]]
| discovered=July 1, 1847
| image=
| alt_names=1947 JB
| pronounced = {{IPAc-en|ˈ|h|iː|b|iː}} {{Respell|HEE|bee}}
| adjectives = Hebean
| named_after = [[Hebe (mythology)|Hēbē]]
| mp_category=[[Main belt]]
| epoch=November 26, 2005 ([[Julian day|JD]] 2453700.5)
| semimajor=2.426 AU (362.851 Gm)
| perihelion=1.937 AU (289.705 Gm)
| aphelion=2.914 [[Astronomical unit|AU]] (435.996 Gm)
| eccentricity=0.202
| period=3.78 [[Julian year (astronomy)|a]] (1379.756 d)
| inclination=14.751°
| asc_node=138.752°
| arg_peri=239.492°
| mean_anomaly=247.947°
| avg_speed=18.93 km/s
| p_orbit_ref = <ref name=Hebe-POE>{{cite web
  |title=AstDyS-2 Hebe Synthetic Proper Orbital Elements
  |publisher=Department of Mathematics, University of Pisa, Italy
  |url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.6&n=6
  |accessdate=2011-10-01}}</ref>
| p_semimajor = 2.4252710
| p_eccentricity = 0.1584864
| p_inclination = 14.3511092°
| p_mean_motion = 95.303184
| perihelion_rate = 31.568209
| node_rate = −41.829042
| 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]])
| mass=1.28{{e|19}} kg<ref name=Baer>{{Cite web
  |year=2008
  |title=Recent Asteroid Mass Determinations
  |publisher=Personal Website
  |author=Jim Baer
  |url=http://home.earthlink.net/~jimbaer1/astmass.txt
  |accessdate=2008-11-28}}</ref>
| density=3.81±0.26 g/cm³<ref name=Baer/>
| surface_grav=~0.087 m/s<sup>2</sup>
| escape_velocity=~0.13 km/s
| rotation=0.3031 d<ref>[http://www.psi.edu/pds/archive/lc.html Planetary Data System Small Bodies Node, lightcurve parameters]</ref>
| spectral_type=[[S-type asteroid]]
| 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
| abs_magnitude=5.71
| albedo=0.268&nbsp;([[geometric albedo|geometric]])<ref name=IRAS />
| angular_size = 0.26" <!-- Horizons 2010-Sep-20 --> to 0.065"
| single_temperature=~170 [[kelvin|K]] <br>''max:'' ~269 K (-4°C)
}}
'''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.


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.


Roberto is what's written concerning his birth certificate but he never really preferred that name. Managing people is literally where his [https://Www.Vocabulary.com/dictionary/primary+profit primary profit] coming in comes from. Base jumping is something that he or she is been doing for a very long time. Massachusetts has always been his located place and his family group loves it. Go to his website to come across out more: http://prometeu.net<br><br>my site: [http://prometeu.net clash of clans hack android]
Hebe is probably the parent body of the [[H chondrite]] meteorites, which account for a remarkable 40% of all [[meteorite]]s striking the Earth.
 
==Discovery==
[[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.]]
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]].
 
==Major meteorite source==
'''6 Hebe''' is the probable parent body of the [[H chondrite]] [[meteorite]]s and the [[IIE iron meteorite]]s.
[[Image:HebeOrbit.png|left|thumb|270px|The orbit of 6 Hebe compared with the orbits of Earth, Mars and Jupiter]]
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&amp;db_key=AST&amp;data_type=HTML&amp;format=&amp;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>):
* The spectrum of Hebe matches a mix of 60% H chondrite and 40% IIE iron meteorite material.
* 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.
* The IIE irons and H chondrites likely come from the same parent body, due to similar trace mineral and oxygen [[isotope]] ratios.
* Asteroids with spectra similar to the [[ordinary chondrite]] meteorites (accounting for 85% of all falls, including the H chondrites) are extremely rare.
* 6 Hebe is extremely well placed to send impact debris to Earth-crossing orbits. Ejecta with even relatively small velocities (~280&nbsp;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.
* Of the asteroids in this "well-placed" orbit, Hebe is the largest.
* 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&amp;data_type=PDF_HIGH&amp;type=PRINTER&amp;filetype=.pdf A. Morbidelli et al. ''Delivery of meteorites through the &nu;<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 />
 
==Physical characteristics==
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°.
 
It has a bright surface and, if its identification as the parent body of the H chondrites is correct, a
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:
# 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.
# Later sizeable impacts broke up and mixed these layers.
# 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.
 
==Moon==
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.
 
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.
 
{{Clear}}
 
==References==
<references/>
 
==External links==
* [http://www.rni.helsinki.fi/~mjk/thirty.pdf shape model deduced from lightcurve]
* [http://adsabs.harvard.edu//full/seri/MNRAS/0007//0000283.000.html MNRAS '''7''' (1847) 283] (discovery announcement)
* [http://adsabs.harvard.edu//full/seri/MNRAS/0008//0000104.000.html MNRAS '''8''' (1848) 103]
* [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=6 JPL Ephemeris]
 
{{MinorPlanets Navigator|5 Astraea|7 Iris}}
{{MinorPlanets_Footer}}
 
{{DEFAULTSORT:Hebe}}
[[Category:Main Belt asteroids]]
[[Category:Asteroids named from Greek mythology]]
[[Category:S-type asteroids]]
[[Category:Astronomical objects discovered in 1847]]

Revision as of 17:04, 13 November 2013

If you're trying to find a place to settle within the heart of Johor Bharu with direct entry to Singapore via highway and/or rail, the MB Builders Sdn. Bhd. has simply the property for you. The newly previewed TriTower Residence @ Johor Bharu Sentral is the upcoming, state-of-the-artwork residential area that offers and gives you the true which means of dwelling in a high definition life-style.

In the end, New Hyde Park residents received their want to preserve the historic spot, and McDonald's had no other possibility however to restore the property to its former glory. Clara Kirk, who runs two ladies's shelters in Englewood, informed DNAinfo the cost of developing a property into one thing more than a garden or expanded yard could be a problem. The Mayor's officer instructed HuffPost that under Chicago's Giant Heaps program, applicants would wish to own a property for no less than 5 years earlier than selling. Jade Residences is a new rare freehold residential property launching near Serangoon MRT and positioned at Lew Lian Vale. Benefit from the 50m Lap pool, Children's Pool in this beautiful development. You aren't obliged to proceed to buy. Woodlands EC Forestville @ Woodlands

One of the many reasons why investing on a brand new rental launch in the nation is best than investing on landed homes is because of the truth that the demand on condos are of a higher request than the latter. With the rise within the nationwide inhabitants, it is no wonder that a residential unit's worth increases to up three% yearly since more and more of Singaporeans are looking for condos across the nation. With every residential unit outfitted with branded built-in appliances, ducted air-conditioning system and have modern end; it is a plus for you when investing on these new residential developments.

Dr Victor Lee is a surgeon gazetted to perform multi-organ transplant surgery. He underwent his fellowship coaching in transplant surgery at the Royal Infirmary of Edinburgh, United Kingdom in 2008 and 2009. He is presently a marketing consultant surgeon at the Singapore Common Hospital, and visiting guide to the Nationwide University Hospital. His clinical interest and expertise are in the areas of transplant surgery, hepatobiliary pancreatic surgery and laparoscopic surgical procedure.

KIngsford. Hillview Peak is an Iconic High-Rise Luxurious Condominium At Hillview Non-public Residential Enclave! Residences in this undertaking would enjoy tranquillity & unblocked view proper subsequent to nature. It is about 5 Minutes' Walk To Future Hillview MRT and subsequent to upcoming shopping mall , HillV2. All units include excessive ceiling! One Balmoral is Freehold condominium developed by Hong Leong Holdings Limited situated within inner-city residing which is a few minutes away from the buying belt of Orchard Road. There is total number of 91 Residential items that consist of 2 tower of 12 storey with 1, 2, 3 and four bedrooms unit varieties to decide on December 12, 2013 by iskandarinsider December 9, 2013 by iskandarinsider December 5, 2013 by iskandarinsider

Processed meals isn't unhealthy for you because the merchandise - pasta sauce, macaroni and cheese, white bread - are inherently candy and salty. It's unhealthy for you because it is inherently industrial. Grocery store supply chains are long, sluggish and and unforgiving, which means every little thing you buy at one has to be made in huge batches, completely standardized, capable of sitting at room temperature in a glass jar or plastic bag for months on end. In the event you took that type of abuse, you'd http://Www.webcams.is/node/16152 want chemical assistance too.

In the long run, New Hyde Park residents acquired their want to preserve the historic spot, and McDonald's had no different choice however to revive the property to its former glory. Clara Kirk, who runs two ladies's shelters in Englewood, instructed DNAinfo the price of creating a property into one thing greater than a backyard or expanded yard might be an issue. The Mayor's officer told HuffPost that beneath Chicago's Massive Tons program, applicants would need to own a property for no less than five years before promoting. Jade Residences is a new rare freehold residential property launching close to Serangoon MRT and situated at Lew Lian Vale. Enjoy the 50m Lap pool, Children's Pool in this beautiful growth. You are not obliged to proceed to purchase. Woodlands EC Forestville @ Woodlands 6 Hebe (Template:IPAc-en Template:Respell) 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 piles.

In brightness, Hebe is the fifth brightest object in the asteroid belt after Vesta, Ceres, Iris and Pallas. It has a mean opposition magnitude of +8.3, about equal to the mean brightness of Titan[1] and can reach +7.5 at an opposition near perihelion.

Hebe is probably the parent body of the H chondrite meteorites, which account for a remarkable 40% of all meteorites striking the Earth.

Discovery

Size comparison: the first 10 asteroids profiled against Earth's Moon. Hebe is sixth from the left.

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, goddess of youth, was proposed by Carl Friedrich Gauss.

Major meteorite source

6 Hebe is the probable parent body of the H chondrite meteorites and the IIE iron meteorites.

The orbit of 6 Hebe compared with the orbits of Earth, Mars and Jupiter

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.[2]):

  • The spectrum of Hebe matches a mix of 60% H chondrite and 40% IIE iron meteorite material.
  • The IIE type are unusual among the iron meteorites, and probably formed from impact melt, rather than being fragments of the core of a differentiated asteroid.
  • The IIE irons and H chondrites likely come from the same parent body, due to similar trace mineral and oxygen isotope ratios.
  • Asteroids with spectra similar to the ordinary chondrite meteorites (accounting for 85% of all falls, including the H chondrites) are extremely rare.
  • 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 AU and the nearby secular resonance which determines the high-inclination edge of the asteroid belt at about 16° inclinations hereabouts.
  • Of the asteroids in this "well-placed" orbit, Hebe is the largest.
  • An analysis of likely contributors to the Earth's meteorite flux places 6 Hebe at the top of the list,[3] due to its position and relatively large size. If Hebe is not the H-chondrite parent body, then where are the meteorites from Hebe?[2]

Physical characteristics

Lightcurve analysis suggests that Hebe has a rather angular shape, which may be due to several large impact craters.[4] Hebe rotates in a prograde direction, with the north pole pointing towards ecliptic coordinates (β, λ) = (45°, 339°) with a 10° uncertainty.[4] This gives an axial tilt of 42°.

It has a bright surface and, if its identification as the parent body of the H chondrites is correct, a 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:

  1. 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.
  2. Later sizeable impacts broke up and mixed these layers.
  3. 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.

Moon

On March 5, 1977 Hebe occulted Kaffaljidhma (γ Ceti), a moderately bright 3rd magnitude star. No other observed occultations by Hebe have been reported.

As a result of that occultation, a small Hebean moon was reported by Paul D. Maley.[5] It was nicknamed "Jebe" (see 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.

50 year old Petroleum Engineer Kull from Dawson Creek, spends time with interests such as house brewing, property developers in singapore condo launch and camping. Discovers the beauty in planing a trip to places around the entire world, recently only coming back from .

References

  1. The Brightest Asteroids
  2. 2.0 2.1 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).
  3. A. Morbidelli et al. Delivery of meteorites through the ν6 secular resonance, Astronomy & Astrophysics, Vol. 282, p. 955 (1994).
  4. 4.0 4.1 Cite error: Invalid <ref> tag; no text was provided for refs named Torppa2003
  5. W. R. Johnston Other reports of Asteroid/TNO Companions

External links

Template:MinorPlanets Navigator Template:MinorPlanets Footer