Ogled vira 135 Herta

{{infopolje Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 
 | name=135 Herta
|discovery_ref   = <ref name=discovery>{{Cite journal | title = Observations of the Planet Hertha (135), made at the Litchfield Observatory of Hamilton College | last = Peters | first = C.A.F. | date = 1874 | journal = [[Astronomische Nachrichten]] | volume = 84 | issue = 2001 | pages = 129 | url = http://adsabs.harvard.edu/abs/1874AN.....84..129P | doi = 10.1002/asna.18740840902}}</ref>
 | discoverer=[[Christian Heinrich Friedrich Peters]]
 | discovered=18. februar [[1874 v znanosti|1874]]
 | designations = yes 
 | mp_name =
 | alt_names=
 | mp_category=[[asteroidni pas]]<br /> [[družina Nisa]]
 | orbit_ref=<ref name=JPL-small-body>[http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=135 Podatki pri JPL]</ref>
 | epoch=[[14. maj]] [[2008]] ([[julijanski dan|JD]]&nbsp;2454600,5)
 | semimajor=2,428 a.e. 
 | perihelion=1,928 a.e. 
| aphelion=2,929 [[astronomska enota|a.e.]]
 | eccentricity=0,205
 | period=1382,31 [[dan|dni]] 
 | inclination=2,305°
 | asc_node=343,843°
 | arg_peri=339,920°
 | mean_anomaly=16,445[[kotna stopinja|°]]
 | avg_speed=
 | dimensions=79,24 km<ref name=JPL-small-body/>
 | mean_radius = 
 | mass=
 | density=
 | surface_grav=
 | escape_velocity=
 | rotation=8,40 [[ura|h]] <ref name=shape-rotation>{{Cite journal | title = Shapes and rotational properties of thirty asteroids from photometric data | last = Torppa | first = J. | display-authors = ''et al.'' | date = August 2003 | journal = [[Icarus (revija)|Icarus]] | volume = 164 | issue = 2 | pages = 346–383 | doi = 10.1016/S0019-1035(03)00146-5}}</ref>
 | pole_ecliptic_lat=
 | pole_ecliptic_lon=
 | spectral_type=[[asteroid tipa M]] <ref name=rotational-properties>{{Cite journal | title = M-type Asteroids: Rotational properties of 16 Objects | last = Dotto | first = E. | display-authors = ''et al.'' | date = October 1992 | journal = Astronomy and Astrophysics Supplement Series | volume = 95 | issue = 2 | pages = 195–211 | url = http://adsabs.harvard.edu/abs/1992A&AS...95..195D}}</ref>
 | magnitude = 
 | abs_magnitude=8,23
 | albedo=0,0615 [[geometrični albedo]] <ref name=JPL-small-body/>
 | angular_size = 
 | single_temperature=
}}

'''135 Herta''' (mednarodno [[poimenovanje astronomskih teles|ime]] ''135 Hertha'') je [[asteroid]] v glavnem [[asteroidni pas|asteroidnem pasu]]. Pripada asteroidni [[družina Nisa|družini Nisa]]. Včasih so [[družina asteroidov|asteroidno družino]] Nisa imenovali tudi [[družina Nisa|družina Herta]].

== Odkritje ==

Asteroid Herto je odkril [[Christian Heinrich Friedrich Peters]] 18. februarja [[1874 v znanosti|1874]].

== Značilnosti ==

Asteroid Herta spada med asteroide [[asteroid tipa M|tipa M]]. V družini, ki ji pripada, je večina asteroidov [[asteroid tipa F|tipa F]], kar daje slutiti, da je vsiljivec<ref>{{Cite journal | title = Asteroid 'clans': Super-families or multiple events? | last1 = Cellino | first1 = A. | last2 = Vincenzo|first2 = Z. | date = October 1993 | journal = Celestial Mechanics and Dynamical Astronomy | volume = 57 | issue = 1-2 | pages = 34–37 | url = http://adsabs.harvard.edu/abs/1993CeMDA..57...37C}}</ref>(asteroid, ki ob trku ni nastal iz istega starševskega telesa kot ostali člani družine). Spektroskopske analize kažejo, da ima na površini [[silikat]]e in bi ga lahko tako uvstili med asteroide predvidenega novega [[asteroid tipa W|tipa W]] <ref name=puzzling-case>{{Cite journal | title = The Puzzling Case of the Nysa–Polana Family | last = Cellino | first = A. | display-authors = ''et al.'' | date = August 2001 | journal = [[Icarus (revija)|Icarus]] | volume = 152 | issue = 2 | pages = 225–237 | doi = 10.1006/icar.2001.6634}}</ref>. (opazili so absorbcijsko črto pri 3 [[mikron|μ]][[meter|m]], kar pomeni prisotnost [[voda|vode]]). [[Svetlobna krivulja]] kaže, da je asteroid Herta ploščato telo<ref name=shape-rotation/>. [[Radar]]ska opazovanja pa so pokazala, da je Herta nekovinska<ref name=radar>{{Cite journal | title = More Results from a Long-Term Radar Survey of M-Class Asteroids | last = Shepard | first = M.K. | display-authors = ''et al.'' | date = September 2006 | journal = Bulletin of the American Astronomical Society | volume = 38 | pages = 626 | url = http://adsabs.harvard.edu/abs/2006DPS....38.7101S}}</ref>. Po odkritju so astronomi raziskovali značilnosti asteroida Herta. Že v letu 1904 je [[George William Hill]] opazil kratkotrajne spremembe svetlosti.<ref name=variability>{{Cite journal | title = Variability of (135) Hertha | last = Hill | first = G.W. | date = March 1904 | journal = [[The Astronomical Journal|Astronomical Journal]] | volume = 24 | issue = 557 | pages = 42 | url = http://articles.adsabs.harvard.edu/full/1904AJ.....24...42H | doi = 10.1086/103543}}</ref>

V letu 2000 so opazovali [[okultacija|okultacijo]] Herte z [[zvezda|zvezdo]].

== Spektralna razvrstitev ==

Asteroid so prvotno uvrščali med asteroide [[spektralna razvrstitev asteroidov|tipa M]]. Leta [[1996]] so na [[Observatorij Mauna Kea|Observetoriju Mauna Kea]] ugotovili, da je potrebno ta asteroid razvrstiti v neoi drugo skupino. Pojav absorbcijske črte pri 3 [[mikron|μ]] [[meter|m]] kaže na to, da je površina hidratirana. Asteroid bi lahko uvrstili v poseben [[asteroidi tipa W|tip W]] (ali »vlažni tip M« – [wet = vlažni]).<ref name=3-micrometer>{{Cite journal | title = The Nature of M-Class Asteroids from 3-μm Observations | last = Rivkin | first = A.S. | display-authors = ''et al.'' | date = June 2000 | journal = [[Icarus (revija)|Icarus]] | volume = 145 | issue = 2 | pages = 351–368 | doi = 10.1006/icar.2000.6354}}</ref> Ugotovili so tudi (Rivkin), da asteroid vsebuje od 0,14 do 0,27 % vode (masni delež), kar je nemogoče za telo v vesolju. V letu [[2002]] je Rivkin s sodelavci pri študiju dela spektra pri 0,7 μm, ki je povezan s hidratiranimi silikati, ugotovil, da je površina zelo neenakomerna.

== Sklici ==

{{sklici|1}}

== Zunanje povezave ==

* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=135%20Hertha;orb=1;cov=0;log=0#orb Simulacija tirnice] {{ikona en}}
* [http://www.cfa.harvard.edu/iau/lists/NumberedMPs000001.html Odkritja asteroidov] {{ikona en}}
* [http://cfa-www.harvard.edu/iau/Ephemerides/Bright/2008/00135.html Efemeride] {{ikona en}}

{{navigacija Mali planeti|134 Sofrosina|136 Avstrija}}
{{Navpred MaliPlaneti}}

{{portal|Astronomija}}

{{DEFAULTSORT:Herta}}
[[Kategorija:Asteroidi, poimenovani po grški mitologiji]]
[[Kategorija:Asteroidi tipa M]]
[[Kategorija:Asteroidi družine Nisa]]
[[Kategorija:Astronomska telesa, odkrita leta 1874]]