(303775) 2005 QU182

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(303775) 2005 QU182
Scoperta30 agosto 2005[1]
ScopritoreM. E. Brown[1],
D. L. Rabinowitz[1],
C. A. Trujillo[1]
FamigliaTNO/oggetto del disco diffuso[2][3]
Designazioni
alternative		2005 QU182
Parametri orbitali
(all'epoca K172G)
Semiasse maggiore16 577 594 207 km
(110,81437275 au)
Perielio5 502 451 647 km
(36,78161742 au)
Afelio27 652 736 766 km
(184,84712808 au)
Periodo orbitale426 070,8 giorni
(1 166,518 anni)
Inclinazione
sull'eclittica		14,04042°
Eccentricità0,6680790
Longitudine del
nodo ascendente		78,32912°
Argom. del perielio223,66713°
Anomalia media14,13349°
Par. Tisserand (TJ)6,709 (calcolato)
Dati fisici
Dimensioni884 km[4][5]

416 km[6]

Dati osservativi
Magnitudine app.+20,8[7]
Magnitudine ass.+3,7
Modifica dati su Wikidata · Manuale

(303775) 2005 QU182 è un oggetto transnettuniano con una magnitudine assoluta (H) di 3,7, perciò è tra i maggiori candidati a diventare un pianeta nano.

Storia delle osservazioni

La scoperta di (303775) 20057 QU182 è avvenuta il 30 agosto 2005 da un gruppo di ricercatori composto da M. E. Brown, D. L. Rabinowitz e C. A. Trujillo.

(303775) 2005 QU182 è stato osservato 35 volte durante 7 opposizioni su immagini risalenti fino al 1974[8].

Parametri orbitali

L'orbita di (303775) 2005 QU182 è molto eccentrica: infatti il perielio si trova a 36,8 UA ovvero poco oltre l'orbita di Nettuno mentre l'afelio si trova a 184,84 UA, al limite esterno del disco diffuso, è perciò anche molto estesa, tra i pianeti nani e i candidati a diventarlo solo Sedna ha un'orbita più grande. Il periodo orbitale è di circa 1200 anni, l'ultimo passaggio al perielio è stato nel 1971[8] e attualmente (3073775) 2005 QU182 si trova a 50 UA dal Sole[7].

L'orbita di (303775) 2005 QU182 è quella blu di cui è evidente l'eccentricità

Magnitudine assoluta

La dimensione di un pianetino può essere desunta dalla sua magnitudine assoluta e dalla sua albedo. (303775) 2005 QU182 ha una magnitudine assoluta di 3,7, perciò le sue dimensioni possono essere comprese tra i 638 e i 1425  km con un valore medio di circa 1000  km, simile a quelle di Cerere.

Note

  1. ^ a b c d MPEC 2007-R03 : 2004 PF115, 2004 PG115, 2004 XA192, 2005 QU182, su minorplanetcenter.net, IAU Minor Planet Center, 1º settembre 2007. URL consultato il 26 agosto 2009.
  2. ^ List Of Centaurs and Scattered-Disk Objects, su minorplanetcenter.net, Minor Planet Center. URL consultato il 21 dicembre 2014.
  3. ^ Marc W. Buie, Orbit Fit and Astrometric record for 05QU182, su boulder.swri.edu, SwRI (Space Science Department), 24 ottobre 2008. URL consultato il 9 dicembre 2008 (archiviato dall'url originale il 4 giugno 2011).
  4. ^ Dan Bruton, Conversion of Absolute Magnitude to Diameter for Minor Planets, su physics.sfasu.edu, Department of Physics & Astronomy (Stephen F. Austin State University). URL consultato il 1º maggio 2012 (archiviato dall'url originale il 12 luglio 2012).
  5. ^ Assumendo un'albedo di 0.09
  6. ^ Wm. Robert Johnston, List of Known Trans-Neptunian Objects, su johnstonsarchive.net, Johnston's Archive, 8 aprile 2012. URL consultato il 1º maggio 2012.
  7. ^ a b AstDys (303775) 2005QU182 Ephemerides, su hamilton.dm.unipi.it, Department of Mathematics, University of Pisa, Italy. URL consultato il 1º maggio 2012 (archiviato dall'url originale il 17 maggio 2009).
  8. ^ a b JPL Small-Body Database Browser: 303775 (2005 QU182), su ssd.jpl.nasa.gov. URL consultato il 1º maggio 2012.

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