Editing 6 Hebe (section)

{{Short description|Large main-belt asteroid}}
{{Use dmy dates|date=April 2025}}
{{Infobox planet
| minorplanet = yes
| background = #D6D6D6
| name = 6 Hebe
| symbol = [[File:Hebe symbol (bold).svg|24px]] (historical)
| image = 6hebe.png
| image_scale = 
| caption = Hebe imaged by the [[European Southern Observatory]]'s [[Very Large Telescope]]
| discoverer = [[Karl Ludwig Hencke]]
| discovered = 1 July 1847
| discovery_site = [[Drezdenko|Driesen]], [[Prussia]]
| discovery_ref = <ref name=jpldata/>
| mpc_name = (6) Hebe
| alt_names = A847 NA; 1847 JB
| pronounced = {{IPAc-en|ˈ|h|iː|b|iː}}<ref>Noah Webster (1884) ''A Practical Dictionary of the English Language''</ref>
| adjectives = Hebean {{IPAc-en|h|iː|ˈ|b|iː|@|n}} (trad.)<ref>Gabriel Nisbet (1733) ''Caledon's Tears''</ref>
| named_after = [[Hebe (mythology)|Hēbē]]
| mp_category = [[Main belt]]
| orbit_ref = <ref name=jpldata/>
| epoch = 13&nbsp;September 2023<br/>([[Julian day|JD]]&nbsp;2453300.5)
| uncertainty = 0
| semimajor = {{Convert|2.43|AU|e6km|abbr=unit}}
| perihelion = {{Convert|1.93|AU|e6km|abbr=unit}}
| time_periastron = 10 March 2022
| aphelion = {{Convert|2.92|AU|e6km|abbr=unit|lk=on}}
| eccentricity = 0.2027
| period = 3.78 [[Julian year (astronomy)|yr]] (1379.85 d)
| inclination = 14.736°
| asc_node = 138.63°
| arg_peri = 239.59°
| mean_anomaly = 144.0°
| avg_speed = 18.93 km/s
| moid = {{Convert|0.97|AU|e6km|abbr=unit}}
| 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=https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=6
  |access-date=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
| flattening = 0.25{{efn|1=Flattening derived from the maximum aspect ratio (c/a): <math>f=1-\frac{c}{a}</math>, where (c/a) = {{val|0.75|0.04}}.<ref name=VLT/>}}
| dimensions = {{val|205|×|185|×|170|ul=km}}<ref name=IRAS>[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab Supplemental IRAS Minor Planet Survey] {{webarchive |url=https://archive.today/20060623213811/http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab |date=23 June 2006 }}</ref><ref name=Torppa2003/>
| mean_diameter = {{val|195|3|u=km}}<ref name=VLT/>
| surface_area = 
| volume = 
| mass = {{val|1.24|0.24|e=19|u=kg}}<ref name=VLT/>{{efn|Composite estimate.}}<br>{{val|1.27|0.13|e=19|u=kg}}{{refn|group=lower-alpha|{{val|6.40|0.67|e=−12|u={{Solar mass}}}}}}<ref name="Baer2011"/>
| density = {{val|3.18|0.64|u=g/cm3}}<ref name=VLT/>
| surface_grav = ~{{Gr|0.0124|102.5}}–{{Gr|0.0127|92.5}} m/s{{sup|2}}
| escape_velocity = ~{{V2|0.0124|102.5}}–{{V2|0.0127|92.5}} km/s<br>(457–486 km/h)
| rotation = 7.274 h<ref name=Torppa2003 />{{rp|349}}
| spectral_type = [[S-type asteroid|S]]
| magnitude = 7.5<ref name="Pasachoff1983">{{Cite book | author=Donald H. Menzel | author2=Jay M. Pasachoff | name-list-style=amp | date=1983 | title=A Field Guide to the Stars and Planets | edition=2nd | publisher=Houghton Mifflin | pages=[https://archive.org/details/fieldguidetostar00menz_0/page/391 391] | location=Boston, MA | isbn=0-395-34835-8 | url-access=registration | url=https://archive.org/details/fieldguidetostar00menz_0/page/391 }}</ref> to 11.50
| abs_magnitude = 5.61<ref name=jpldata/>
| pole_ecliptic_lat = 45°
| pole_ecliptic_lon = 339°
| albedo = 0.268<ref name=VLT/><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}}) is a large [[asteroid belt|main-belt]] [[asteroid]], containing around 0.5% of the mass of the belt. However, due to its apparently high bulk density (greater than that of the [[Moon]]), Hebe does not rank among the top twenty asteroids by volume. 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 Saturn's moon [[Titan (moon)|Titan]],<ref>[http://jas.org.jo/ast.html The Brightest Asteroids] {{webarchive|url=https://web.archive.org/web/20080511115437/http://www.jas.org.jo/ast.html |date=2008-05-11 }}</ref> and can reach +7.5 at an opposition near perihelion.

Hebe may be the parent body of the [[H chondrite]] meteorites, which account for about 40% of all [[meteorite]]s striking Earth.