(21656) Knuth
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{{#switch: 1999 PX1, 1990 SV16, 1998 HZ140| Asteroid {{#if: (21656) Knuth |(21656) Knuth|{{#invoke:WLink|getArticleBase}} }} | |||||||||||||||||||||||||||||||||||||||||||
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| Eigenschaften des Orbits {{#if:21656|Vorlage:Infobox Asteroid/Database}}{{#if:| Epoche: {{#if: {{#titleparts:{{{Epoche}}}|1|2}}|{{#invoke:DateTime|format|{{#titleparts:{{{Epoche}}}|1|1}}-{{#titleparts:{{{Epoche}}}|1|2}}-{{#titleparts:{{{Epoche}}}|1|3}}|T._Monat JJJJ}} (JD {{#iferror:{{#expr:1*{{#if:{{#titleparts:{{{Epoche}}}|1|1}}|{{#expr:(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57608.5 round 0)/12-1.5 round 0)*1461/4-0.5 round 0)-(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57608.5 round 0)/12-1.5 round 0)/100-0.5 round 0)+(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57608.5 round 0)/12-1.5 round 0)/400-0.5 round 0)+(((({{#titleparts:{{{Epoche}}}|1|2}})+57608.5 round 0)mod 12+4)*153/5-0.5 round 0)+({{#titleparts:{{{Epoche}}}|1|3}})+(0)/24+(0)/1440+(0)/86400-32167.5}}|Parameter 1=kein Jahr angegeben!}}}}|{{#if:{{#titleparts:{{{Epoche}}}|1|1}}|{{#expr:(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57608.5 round 0)/12-1.5 round 0)*1461/4-0.5 round 0)-(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57608.5 round 0)/12-1.5 round 0)/100-0.5 round 0)+(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57608.5 round 0)/12-1.5 round 0)/400-0.5 round 0)+(((({{#titleparts:{{{Epoche}}}|1|2}})+57608.5 round 0)mod 12+4)*153/5-0.5 round 0)+({{#titleparts:{{{Epoche}}}|1|3}})+(0)/24+(0)/1440+(0)/86400-32167.5}}|Parameter 1=kein Jahr angegeben!}}|{{#if:{{#titleparts:{{{Epoche}}}|1|1}}|{{#expr:(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57.608,5 round 0)/12−1,5 round 0)*1.461/4−0,5 round 0)-(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57.608,5 round 0)/12−1,5 round 0)/100−0,5 round 0)+(((({{#titleparts:{{{Epoche}}}|1|1}})*12+({{#titleparts:{{{Epoche}}}|1|2}})+57.608,5 round 0)/12−1,5 round 0)/400−0,5 round 0)+(((({{#titleparts:{{{Epoche}}}|1|2}})+57.608,5 round 0)mod 12+4)*153/5−0,5 round 0)+({{#titleparts:{{{Epoche}}}|1|3}})+(0)/24+(0)/1.440+(0)/86.400−32.167,5}}|Parameter 1=kein Jahr angegeben!}}}})
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Vorlage:JD (JD {{#iferror:{{#expr:1*{{{Epoche}}}}}|{{{Epoche}}}|{{{Epoche}}}}}) }} }} | ||||||||||||||||||||||||||||||||||||||||||
| Orbittyp | {{#switch:Hauptgürtelasteroid | ORB = Hauptgürtelasteroid | AMOR = Erdnaher Asteroid, Amor-Typ{{#ifeq: | }} | APOLLO = Erdnaher Asteroid, Apollo-Typ{{#ifeq: | }} | ATEN = Erdnaher Asteroid, Aten-Typ{{#ifeq: | }} | ATIRA = Erdnaher Asteroid, Atira-Typ{{#ifeq: | }} | IMB = Innerer Hauptgürtel{{#ifeq: | }} | MMB = Mittlerer Hauptgürtel{{#ifeq: | }} | OMB = Äußerer Hauptgürtel{{#ifeq: | }} | JTN4 = Jupiter-Trojaner (L4){{#ifeq: | }} | JTN5 = Jupiter-Trojaner (L5){{#ifeq: | }} | MCA = Marsbahnkreuzer{{#ifeq: | }} | MCG = Marsbahngrazer{{#ifeq: | }} | MTJ4 = Mars-Trojaner (L4){{#ifeq: | }} | MTJ5 = Mars-Trojaner (L5){{#ifeq: | }} | NTJ4 = Neptun-Trojaner (L4){{#ifeq: | }} | NTJ5 = Neptun-Trojaner (L5){{#ifeq: | }} | PLU = Plutino{{#ifeq: | }} | QB1 = Cubewano{{#ifeq: | }} | TNO = Transneptunisches Objekt{{#ifeq: | }} | ZEN = Zentaur{{#ifeq: | }} | SDO = SDO{{#ifeq: | }} | #default= Hauptgürtelasteroid
}}{{#if:|{{{Orbittyp_ref}}}}} |
| Asteroidenfamilie | {{{Familie}}}|Vorlage:Infobox Asteroid/Familie }} | ||||||||||||||||||||||||||||||||||||||||||
| Große Halbachse | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | Z- = -abs trunc}}(Vorlage:Infobox Asteroid/GetNumber) = (Vorlage:Infobox Asteroid/GetNumber) {{#if: | round ({{{3}}}) }} | 1 }} }} | Vorlage:Str round|2,7109}} AE | ||||||||||||||||||||||||||||||||||||
| Exzentrizität | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | Z- = -abs trunc}}(Vorlage:Infobox Asteroid/GetNumber) = (Vorlage:Infobox Asteroid/GetNumber) {{#if: | round ({{{3}}}) }} | 1 }} }} |Vorlage:Str round|0,2243}} | ||||||||||||||||||||||||||||||||||||
| Perihel – Aphel | Vorlage:Str round AE – Vorlage:Str round AE | ||||||||||||||||||||||||||||||||||||||||||
| Perihel – Aphel | {{#iferror:{{#expr:1*2,1029}}|2,1029|2,1.029}} AE – {{#iferror:{{#expr:1*3,3190}}|3,3190|3,3.190}} AE | ||||||||||||||||||||||||||||||||||||||||||
| Neigung der Bahnebene | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | Z- = -abs trunc}}(Vorlage:Infobox Asteroid/GetNumber) = (Vorlage:Infobox Asteroid/GetNumber) {{#if: | round ({{{3}}}) }} | 1 }} }} |Vorlage:Str round | 9,2503 }}° | ||||||||||||||||||||||||||||||||||||
| Länge des aufsteigenden Knotens | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} | Vorlage:Str round | {{{Knoten}}} }}° | ||||||||||||||||||||||||||||||||||||
| Argument der Periapsis | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} |Vorlage:Str round | {{{Periwinkel}}} }}° | ||||||||||||||||||||||||||||||||||||
| Zeitpunkt des Periheldurchgangs | Vorlage:JD|{{#if:|Vorlage:Infobox Asteroid/GetDate}}
}} | ||||||||||||||||||||||||||||||||||||||||||
| Siderische Umlaufperiode | {{#invoke:Vorlage:Infobox Asteroid|OrbitPeriod|1={{{Periode}}}}} | ||||||||||||||||||||||||||||||||||||||||||
| Siderische Umlaufzeit | 4,46 a | ||||||||||||||||||||||||||||||||||||||||||
| Mittlere Orbitalgeschwindigkeit | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} | {{#iferror:{{#expr:1*18,09}}|18,09|18,09}} | 18,09 }} km/s | ||||||||||||||||||||||||||||||||||||
| Mittlere Orbitalgeschwindigkeit | Vorlage:Str round km/s | ||||||||||||||||||||||||||||||||||||||||||
| Physikalische Eigenschaften | |||||||||||||||||||||||||||||||||||||||||||
| Mittlerer Durchmesser | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} | }} {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} | ± km|}} | |||||||||||||||||||||||||||||
| Abmessungen | {{{Abmessungen}}} | ||||||||||||||||||||||||||||||||||||||||||
| Masse | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} | | }} kg | ||||||||||||||||||||||||||||||||||||
| Albedo | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} | | }} | ||||||||||||||||||||||||||||||||||||
| Mittlere Dichte | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} | | }} g/cm³ | ||||||||||||||||||||||||||||||||||||
| Rotationsperiode | {{#invoke:Vorlage:Infobox Asteroid|Rotation|1=}} | ||||||||||||||||||||||||||||||||||||||||||
| Absolute Helligkeit | {{#if: {{#iferror:{{#ifexpr:{{#switch: | R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc | round ({{{3}}}) }} | 1 }} }} | Vorlage:Str round | 14,6 }} mag | ||||||||||||||||||||||||||||||||||||
| Spektralklasse | |||||||||||||||||||||||||||||||||||||||||||
| Spektralklasse (nach Tholen) |
{{{Tholen}}} | ||||||||||||||||||||||||||||||||||||||||||
| Spektralklasse (nach SMASSII) |
{{{Smass}}} | ||||||||||||||||||||||||||||||||||||||||||
| Geschichte | |||||||||||||||||||||||||||||||||||||||||||
| Entdecker | Petr Pravec Peter Kušnirák | ||||||||||||||||||||||||||||||||||||||||||
| Datum der Entdeckung | Vorlage:Infobox Asteroid/GetDateVorlage:Infobox Astronomie/Entdeckungskategorie | ||||||||||||||||||||||||||||||||||||||||||
| = | - = | – = | #default = | Andere Bezeichnung | 1999 PX1, 1990 SV16, 1998 HZ140
}} | ||||||||||||||||||||||||||||||||||||||
| Quelle: Wenn nicht einzeln anders angegeben, stammen die Daten vom Vorlage:Infobox Asteroid/Database. Die Zugehörigkeit zu einer Asteroidenfamilie wird automatisch aus der AstDyS-2 Datenbank ermittelt. Bitte auch den Hinweis zu Asteroidenartikeln beachten. | |||||||||||||||||||||||||||||||||||||||||||
{{#if:||Vorlage:Infobox Asteroid/Kategorien }}{{#if:{{#iferror:{{#ifexpr:{{#switch:
| R+ = abs | R- = -abs | Z = trunc | Z+ | N = abs trunc
| Z- = -abs trunc}}(21656) = (21656) {{#if: | round ({{{3}}}) }} | 1 }} }}||
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(21656) Knuth ist ein Asteroid des Hauptgürtels, der am 9. August 1999 vom tschechischen Astronomen Petr Pravec und seinem slowakischen Kollegen Peter Kušnirák an der Sternwarte Ondřejov (IAU-Code 557) in Tschechien entdeckt wurde.
Der Asteroid ist nach dem US-amerikanischen Professor für Informatik Donald E. Knuth (* 1938) benannt, der das Standardwerk The Art of Computer Programming verfasste und ab 1977 das Textsatzsystem TeX entwickelte.
Siehe auch
Weblinks
- Asteroid Knuth: Discovery Circumstances gemäß dem Minor Planet Center der Internationalen Astronomischen Union bei dem Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
- {{#if:||(21656) Knuth}} in der Small-Body Database des Jet Propulsion Laboratory (englisch).{{#if:| (Epoche: {{#iferror:{{#invoke:Vorlage:FormatDate|Execute}}|}})}}{{#if:|}}
- Vorlage:AstDyS
- Seiten mit nicht-numerischen formatnum-Argumenten
- Asteroid vom Amor-Typ
- Asteroid vom Apollo-Typ
- Asteroid vom Aten-Typ
- Asteroid vom Atira-Typ
- Asteroid des inneren Hauptgürtels
- Asteroid des mittleren Hauptgürtels
- Asteroid des äußeren Hauptgürtels
- Jupiter-Trojaner (L4)
- Jupiter-Trojaner (L5)
- Marsbahnkreuzer
- Trojaner (Astronomie)
- Neptun-Trojaner (L4)
- Neptun-Trojaner (L5)
- Plutino
- Kuipergürtelasteroid
- Transneptunisches Objekt
- Zentaurasteroid
- Scattered Disk Object
- Vorlage:Infobox Asteroid/Große Halbachse
- Vorlage:Infobox Asteroid/Exzentrizität
- Vorlage:Infobox Asteroid/Bahnneigung
- Hauptgürtelasteroid unter 50 km Durchmesser