(145453) 2005 RR43

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(145453) 2005 RR43
Discovered by A. C. Becker,
A. W. Puckett,
J. Kubica
Discovery date September 9, 2005
MPC designation (145453) 2005 RR43
Alternative names none
Minor planet category Cubewano[1][2]
Extended (DES)[3]
Orbital characteristics[1]
Aphelion 48.964 AU
Perihelion 37.183 AU
Semi-major axis 43.073 AU
Eccentricity 0.137
Mean anomaly 33.5°
Inclination 28.5°
Longitude of ascending node 85.8°
Argument of perihelion 278.4°
Physical characteristics
Dimensions 252 km[4][5]
Albedo 0.7 (assumed)
Spectral type B-V=0.77, V-R=0.41[6]
Absolute magnitude (H) 4.0[1]

(145453) 2005 RR43, also written as (145453) 2005 RR43, is a trans-Neptunian object (TNO) estimated to be about 252 km in diameter. It was discovered by Andrew C. Becker, Andrew W. Puckett, and Jeremy Martin Kubica on September 9, 2005 at Apache Point Observatory in Sunspot, New Mexico.


Based on their common pattern of IR water-ice absorptions and neutral visible spectrum,[8] and the clustering of their orbital elements, the KBOs (145453) 2005 RR43, 1995 SM55, (19308) 1996 TO66, (55636) 2002 TX300, and (120178) 2003 OP32 appear to be collisional fragments broken off the dwarf planet Haumea.


The surface is covered by water ice as attested by deep absorption at 1.5 and 2 μm in the infrared spectrum and neutral (i.e. non-red) colour. Scattering models reveal that the observed water ice is, at least in a significant fraction, crystalline and organics, detected on the surface of many TNO, are completely absent.[8] These physical and orbital characteristics common with Haumea led to suggestion that 2005 RR43 is a member of the Haumea collisional family. The object, together with other members of the family ( (19308) 1996 TO66, (24835) 1995 SM55, (55636) 2002 TX300, and (120178) 2003 OP32), would be created from ice mantle ejected from the proto-Haumea as result of a collision with another large (~1660 km) body.[9]

Neutral (non-red) Color Index
TheTransneptunians Color Distribution-2005RR43.png
The + marks 2005 RR43 (B-V=0.77, V-R=0.41) on this color plot of TNOs. All the other Haumea-family members are located to the lower left of this point.


  1. ^ a b c "JPL Small-Body Database Browser: 145453 (2005 RR43)". 2006-12-22 last obs. Retrieved 2009-08-28. 
  2. ^ "MPEC 2009-R09 :Distant Minor Planets (2009 SEPT. 16.0 TT)". IAU Minor Planet Center. 2009-09-04. Retrieved 2011-01-08. 
  3. ^ Marc W. Buie (2008-12-06 using 140 observations). "Orbit Fit and Astrometric record for 145453". SwRI (Space Science Department). Retrieved 2009-10-04. 
  4. ^ Assuming a Haumea-like albedo of 0.7
  5. ^ Dan Bruton. "Conversion of Absolute Magnitude to Diameter for Minor Planets". Department of Physics & Astronomy (Stephen F. Austin State University). Retrieved 2009-12-27. 
  6. ^ Snodgrass, Carry, Dumas, Hainaut (16 December 2009). "Characterisation of candidate members of (136108) Haumea's family". The Astrophysical Journal. arXiv:0912.3171. Bibcode:2010A&A...511A..72S. doi:10.1051/0004-6361/200913031. 
  7. ^ David L. Rabinowitz, Bradley E. Schaefer, Martha W. Schaefer, Suzanne W. Tourtellotte (2008). "The Youthful Appearance of the 2003 EL61 Collisional Family". ArXiv.org. arXiv:0804.2864. Bibcode:2008AJ....136.1502R. doi:10.1088/0004-6256/136/4/1502. 
  8. ^ a b Pinilla-Alonso, N.; Licandro, J.; Gil-Hutton, R.; Brunetto, R. (June 2007). "The water ice rich surface of (145453) 2005 RR43: a case for a carbon-depleted population of TNOs?". Astronomy and Astrophysics 468 (1): L25. arXiv:astro-ph/0703098. Bibcode:2007A&A...468L..25P. doi:10.1051/0004-6361:20077294. 
  9. ^ Michael E. Brown, Kristina M. Barkume; Darin Ragozzine; Emily L. Schaller (2007). "A collisional family of icy objects in the Kuiper belt". Nature 446 (7133): 294–296. Bibcode:2007Natur.446..294B. doi:10.1038/nature05619. PMID 17361177. 

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