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Post Info TOPIC: Asteroid 2012 DR30


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RE: Asteroid 2012 DR30
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Title: A portrait of the extreme Solar System object 2012 DR30
Authors: Cs. Kiss, Gy. Szabó, J. Horner, B.C. Conn, T.G. Müller, E. Vilenius, K. Sárneczky, L.L. Kiss, M. Bannister, D. Bayliss, A. Pál, S. Góbi, E. Verebélyi, E.~Lellouch, P. Santos-Sanz, J.L. Ortiz, R. Duffard, N. Morales

2012 DR30 is a recently discovered Solar System object on a unique orbit, with a high eccentricity of 0.9867, a perihelion distance of 14.54 AU and a semi-major axis of 1109 AU, in this respect outscoring the vast majority of trans-Neptunian objects. We performed Herschel/PACS and optical photometry to uncover the size and albedo of 2012 DR30, together with its thermal and surface properties. The body is 185 km in diameter and has a relatively low V-band geometric albedo of ~8%. Although the colours of the object indicate that 2012 DR30 is an RI taxonomy class TNO or Centaur, we detected an absorption feature in the Z-band that is uncommon among these bodies. A dynamical analysis of the target's orbit shows that 2012 DR30 moves on a relatively unstable orbit and was most likely only recently placed on its current orbit from the most distant and still highly unexplored regions of the Solar System. If categorised on dynamical grounds 2012 DR30 is the largest Damocloid and/or high inclination Centaur observed so far.

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RE: Asteroid 2012 DR30 = 2009 FW54
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2012 DR30 = 2009 FW54

Orbital Elements at Epoch 2456000.5 (2012-Mar-14.0) TDB
Reference: E2012E01 (heliocentric ecliptic J2000)
 ElementValueUncertainty (1-sigma)  Units 
e0.9867936n/a 
a1100.939133n/aAU
q14.5394426n/aAU
i78.01891n/adeg
node341.43800n/adeg
peri195.21003n/adeg
M0.00985n/adeg
tp2455635.4147517
(2011-Mar-14.91475170)
n/aJED
period13343217.1979244
36531.74
n/a
n/a
d
yr
n0.00002698n/adeg/d
Q2187.3388234n/aAU
 Orbit Determination Parameters
   # obs. used (total)     93  
   first obs. used     2009-??-??  
   last obs. used     2012-02-28  
   # oppositions     2  
   planetary ephem.     DE403  
   fit RMS     0.25  
   data source     MPC:mpu  
   producer     MPCS  

Additional Information
 T_jup = 0.983 
 MPC Scattered disk 

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RE: Asteroid 2012 DR30
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2012DR30.gif

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Orbital elements:
2012 DR30
Epoch 2012 Feb. 23.0 TT = JDT 2455980.5                 MPC
M   0.00023              (2000.0)            P               Q
n   0.00048493     Peri.  203.99474     -0.89403431     +0.30999605
a 160.4539006      Node   340.53326     +0.35150415     +0.03779252
e   0.9100696      Incl.   76.04753     -0.27775437     -0.94998641
P2032              H    7.2           G   0.15
From 68 observations 2012 Feb. 22-26.

MPEC 2012 - D67



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