18610 Arthurdent

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| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}}<ref name="jpldata" />

| data21 = | data22 = {{#if:4 September 2017 (JD 2458000.5) |Epoch 4 September 2017 (JD 2458000.5)}} | data23 = {{#if:0 | Uncertainty parameter 0}} | label24 = Observation arc | data24 = 28.06 yr (10,248 days) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 3.0932 AU | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = 2.0018 AU | label28 = Peri{{#if:|{{{apsis}}}|apsis}} | data28 = | label29 = {{#switch:{{{apsis}}} |helion|astron=Ap{{{apsis}}} |Apo{{#if:|{{{apsis}}}|apsis}}}} | data29 = | label30 = Periastron | data30 = | label31 = Apoastron | data31 = | label32 = Template:Longitem | data32 = 2.5475 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.2142 | label35 = Template:Longitem | data35 = 4.07 yr (1,485 days) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 321.77° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 5.5878° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 319.49° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 139.42° | label46 = Template:Nowrap | data46 = | label47 = Satellite of | data47 = | label48 = Group | data48 = | label49 = {{#switch: |yes|true=Satellites |Known satellites}} | data49 = | label50 = Star | data50 = | label51 = Earth MOID | data51 = | label52 = Mercury MOID | data52 = | label53 = Venus MOID | data53 = | label54 = Mars MOID | data54 = | label55 = Jupiter MOID | data55 = | label56 = Saturn MOID | data56 = | label57 = Uranus MOID | data57 = | label58 = Neptune MOID | data58 = | label59 = T_Jupiter | data59 =

| header60 = Proper orbital elements

| label61 = Template:Longitem | data61 = {{#if: |{{{p_semimajor}}} AU}} | label62 = Template:Longitem | data62 = | label63 = Template:Longitem | data63 = | label64 = Template:Longitem | data64 = {{#if: |{{{p_mean_motion}}} deg Template:\yr}} | label65 = Template:Longitem | data65 = {{#if:|{{#expr:360/1 round 5}} yr
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| header70 = Template:Anchor{{#if:yes| Physical characteristics|Physical characteristics}}

| label71 = Dimensions | data71 = Template:Val km Template:Small<ref name="h" />
Template:Val km<ref name="Masiero-2011" /> | label72 = Template:Longitem | data72 = | label73 = Template:Longitem | data73 = | label74 = Template:Longitem | data74 = | label75 = Template:Longitem | data75 = | label76 = Flattening | data76 = | label77 = Circumference | data77 = | label78 = Template:Longitem | data78 = | label79 = Volume | data79 = | label80 = Mass | data80 = | label81 = Template:Longitem | data81 = | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = | label85 = Template:Longitem | data85 = | label86 = Template:Longitem | data86 = | label87 = Template:Longitem | data87 = | label88 = Template:Longitem | data88 = | label89 = Template:Longitem | data89 = | label90 = Template:Longitem | data90 = | label91 = Template:Longitem | data91 = | label92 = Template:Longitem | data92 = | label93 = {{#if:yes |Template:Longitem |Albedo}} | data93 = Template:Val<ref name="Masiero-2011" /> | label94 = Temperature | data94 =

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Surface temp.	min	mean	max
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| header110 = Atmosphere

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18610 Arthurdent (provisional designation Template:Mp) is an asteroid from the middle region of the asteroid belt, approximately 3.5 kilometers in diameter. It was discovered on 7 February 1998, by a team of astronomers including Felix Hormuth at Starkenburg Observatory in Heppenheim, Germany.<ref name="MPC-Arthurdent" /> The asteroid was named after Arthur Dent from Douglas Adams's Hitchhiker's Guide to the Galaxy series.<ref name="springer" />

Orbit and classificationEdit

Arthurdent orbits the Sun in the central main-belt at a distance of 2.0–3.1 AU once every 4 years and 1 month (1,485 days). Its orbit has an eccentricity of 0.21 and an inclination of 6° with respect to the ecliptic.<ref name="jpldata" /> The first known precovery image was taken during the Digitized Sky Survey (DSS) at Palomar Observatory in 1988, extending the asteroid's observation arc by 10 years prior to its official discovery observation.<ref name="MPC-Arthurdent" />

Physical characteristicsEdit

Diameter and albedoEdit

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Arthurdent measures 3.5 kilometers in diameter and its surface has an albedo of 0.234.<ref name="Masiero-2011" /> This agrees with a generic absolute magnitude-to-diameter conversion for a silicaceous asteroid (albedo of 0.25), which gives a diameter of approximately 3 kilometers for an absolute magnitude of 14.3.<ref name="h" />

Rotation periodEdit

As of 2017, the Arthurdent's composition, rotation period and shape remain unknown.<ref name="jpldata" /><ref name="lcdb" />

NamingEdit

This minor planet was named after Arthur Dent, the bewildered hero of Douglas Adams's radio play and book The Hitchhiker's Guide to the Galaxy.<ref name="The-Guardian" /> The naming of the asteroid was announced by the Minor Planet Center (MPC) in its Minor Planet Circular on 9 May 2001 (Template:Small).<ref name="M.P.C.42677" /><ref name="MPC-Circulars-Archive" /> Two days later, Adams died of a heart attack in Santa Barbara, California.<ref name="inertramblings" />

Coincidence with deathEdit

The near coincidence of these events led to some media reports of the asteroid naming appearing after Adams's death was reported, and to assumptions that the two events occurred on the same day, even by those connected to the naming: on 14 May 2001, German amateur astronomer Reiner Stoss at the Starkenburg Observatory wrote: "You may have heard the sad news that Douglas Adams passed away last Friday. By accident on the same day the naming of minor planet (18610) Arthurdent was announced by the Minor Planet Center. We wanted to make Mr. Adams a joy, but did never dare to think that he wouldn't be able to receive this surprise, when we sent our name proposal to the MPC a few months back."<ref name="CCNet" />

ReferencesEdit

Template:Reflist

External linksEdit

Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center
Template:AstDys
Template:JPL small body

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