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CHARON-LIKE OBJECTS

CHARON-LIKE OBJECTS. CHARON-LIKE OBJECTS. Pinilla-Alonso, Noemí Licandro, Javier Brunetto,Rosario Strazulla,Giovanni. (55636) 2002 TX 300.

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CHARON-LIKE OBJECTS

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  1. CHARON-LIKE OBJECTS CHARON-LIKE OBJECTS Pinilla-Alonso, Noemí Licandro, Javier Brunetto,Rosario Strazulla,Giovanni

  2. (55636) 2002 TX300 In late 2000 we started a program to study the surface properties of TNOs, Centaurs and comet nuclei using the Italian 3.58 m Telescopio Nazionale Galileo (TNG) at El Roque de los Muchachos Observatory Classical TNO

  3. Blue slope Deep WI bands (59±6% - 67 ±10%) No sings of crystalline (S/N) Featureless Sligthly blue slope S’=1% (0.53-1.2mm) Licandro et al,In press

  4. 40 % WI 250 mm 90 % WI 60 mm models are not unique !!!!

  5. Looking for TNOs with similar spectra !!!

  6. Water Ice (C + Am)+ Ammonia Hydrate + Dark Materials

  7. 1. Crystalline Water Ice The depth of 1.65 mm respect to 1.5 mm is related to the ratio crystalline/amorphous water ice (Poster Brunetto et al) Cook et al 2006

  8. 2. The presence of Ammonia Hydrate associated with cryovolcanism propossed to explain the presence of crystalline water ice Cook et al 2006

  9. Charon 2002 TX300

  10. Spectra from Robert.H.Brown in 1998 (two consecutive days) The spectrum varies with rotational phase Model: water ice (70 mm) and dark material

  11. Noll et al, 2000 Noll et al 2000 To66 de Noll Neutral to blue in the visible Nicmos + ground based measurements

  12. 2005 Aug 1st + 2006 Feb 26th @ TNG and WHT Deep Crystalline Water Ice bands Neutral Visible Spectrum

  13. Trujillo et al: Water Ice + HCN or other blue featureless components Dumas et al: Water Ice + Tholins + Carbon (Poster)

  14. Are these spectra really similar ?

  15. 2003 EL61 VIS (this work) + NIR (Trujillo et al 2006) Charon (Brown & Calvin 2000) 2002 TX300 (Licandro et al 2006) Brown et al 1999 1996 TO 66 Noll et al 2000 YES!!! We present: Charon-like Objects

  16. In Brief: Charon: Crystalline Water Ice (50 mm) +Amosphous Water Ice + Hydrated Ammonia + Dark material 2003 EL61:(Crystalline + Amorphous) Water Ice + Organics + Carbons 1999 TO66:Amorphous water ice (70 mm) + Dark material + Crystalline Water Ice (low S/N)? 2002 TX300: Water ice (50-250mm) + Carbons orSilicates + Crystalline Water Ice (low S/N)?

  17. Difference in size between Charon+2003EL61 and 2002TX300+1999TO66 Sizes calculate taking as reference the albedo of Charon (0.4) Clear Similarities in the orbital parameters of some of them

  18. Model: 250 mm WI particles (Barkume et al )

  19. Surfaces covered mainly by large water ice particles are more usual than expected. We need a resurfacing process that brings fresh ices from the interior to the surfaces of these bodies.

  20. Two mechanism have been proposed Cryovolcanism & Collisions Ammonia Hydrate Feature at 2.2 mm May act as a continous mechanism Breaks the mantle. Brings up fresher material.

  21. => Deep Methane Bands => Red Continuum Similar orbits but different surfaces => Deep Water Ice bands. => Neutral continuum

  22. Conclusions • => We present vis+NIR spectra of two Charon-like objects with different size as 2002 TX300 & 2003 El61. • => We compare with already published spectrum of another medium-size TNO (1996 TO66) that shows similar spectral characteristics. • Higher S/N spectra are needed in the case of 2000 TX300 & 1996 TO66 to determine to what extend these spectra are similar to Charon´s one. • We compare orbital parameters of these group of TNOs.

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