| 词条 | 801 Helwerthia |
| 释义 |
| minorplanet= yes | background= #D6D6D6 | name= 801 Helwerthia | mpc_name= (801) Helwerthia | alt_names= 1915 WQ; A924 OD; 1925 RG; 1970 GS1 | discoverer= Max Wolf | discovered= 20 March 1915 | discovery_site= Heidelberg Observatory | epoch= 31 July 2016 (JD 2457600.5) | eccentricity= 0.078337 | semimajor= {{Convert|2.6047|AU|Gm|abbr=on}} | perihelion= {{Convert|2.4007|AU|Gm|abbr=on}} | aphelion= {{Convert|2.8087|AU|Gm|abbr=on|lk=on}} | period= 4.20 yr (1535.4 d) | inclination= 14.130° | asc_node= 185.973° | arg_peri= 335.076° | mean_anomaly= 47.6362° | mean_motion= {{Deg2DMS|0.23446|sup=ms}} / day | orbit_ref= [1] | observation_arc= 101.08 yr (36918 d) | uncertainty= 0 | abs_magnitude= 11.55 | rotation= {{Convert|23.93|h|d|abbr=on|lk=on}} | albedo= {{val|0.0384|0.007}} | mean_radius= {{val|16.615|1.25}} km | moid= {{Convert|1.41172|AU|Gm|abbr=on}} | jupiter_moid= {{Convert|2.17333|AU|Gm|abbr=on}} | tisserand= 3.366 }}801 Helwerthia is a C-type asteroid orbiting in the Main belt near the Eunomia family. However, it is not a family member but an un-related interloper in the region because its composition is inconsistent with membership. Its diameter is about 33 km, its albedo around 0.038. An international team of astronomers observed this minor planet photometrically in 2012, determining a rotation period of {{Val|23.93|0.01|u=hour}} with an amplitude of {{Val|0.15|0.03}} in magnitude.[3] References1. ^{{Cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=801;cad=1 |title=801 Helwerthia (1915 WQ) |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=6 May 2016}} [2]2. ^1 {{citation | title=Rotation Period Determination for 801 Helwerthia | display-authors=1 | last1=Pilcher | first1=Frederick | last2=Ferrero | first2=Andrea | last3=Inasaridze | first3=Raguli Ya. | last4=Krugly | first4=Yurij N. | last5=Molotov | first5=Igor E. | last6=Oey | first6=Julian | last7=Strabla | first7=Luca Pietro | last8=Quadri | first8=Ulisse | last9=Girelli | first9=Roberto | journal=The Minor Planet Bulletin | volume=39 | issue=4 | pages=222–225 | date=October 2012 | bibcode=2012MPBu...39..222P }} }} External links
6 : Background asteroids|Discoveries by Max Wolf|Minor planets named for people|Named minor planets|XC-type asteroids (Tholen)|Astronomical objects discovered in 1915 |
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