1. 2006 SQ 372 : A Planetary Interloper from the Inner Oort Cloud N. Kaib, A. Becker, L. Jones University of Washington

2. 25000 AU LPCs near Earth only constrain outer Oort Cloud LPCs beyond Saturn will sample inner Oort Cloud as well LPCs and Oort Cloud a > 20,000 AU a > 1,000 AU ~

3. SDSS-II SN Survey Observations 2006 SQ 372

4. SDSS-II SN Survey Observations 2006 SQ 372

5. SDSS-II SN Survey Observations 2006 SQ 372

6. SDSS-II SN Survey Observations 2006 SQ 372

7. Orbit Summary a = 796 AUq = 24.2 AUi = 19.5°

8. Orbital Evolution Current orbit is transient - unstable after ~200 Myrs!

9. Two Different Origin Scenarios 1. Scattered Disk semimajor axis perihelion x

10. Two Different Origin Scenarios 2. Oort Cloud semimajor axis perihelion x OC SD

11. Simulations Scattered Disk 2,500 particles Orbit distributions based on SDO observations Run for 4.5 Gyrs Oort Cloud 10 6 particles Orbit distributions based on Kaib & Quinn (2008) sims Run for 1.4 Gyrs Non-symplectic variable timestep integrator based on SWIFT (Levison & Duncan, 1994; Kaib & Quinn, 2008)

12. Results – OC Sim. (10° < i < 30°)

13. Fractional Occupation Map X 2006 SQ 372 10° < i < 30°

14. f OC /f SD Map SQ 372 For 2006 SQ 372 : f OC /f SD  0.7

15. Origin Implications Prob OC /Prob SD = (f OC /f SD ) x (N OC /N SD ) f OC /f SD  0.7 N OC = 2 x 10 11 (Neslusan, 2007) N SD = 4 x 10 9 (Fernandez, 2004) Prob OC /Prob SD > 35 ~

16. Origin Implications 2006 SQ 372 is at least 35 times more likely to come from the Oort Cloud compared to the Scattered Disk Which region of the Oort Cloud?

17. Inner Oort Cloud Origin Semimajor axis drawdown time vs. Perihelion drift time  q = -10 AU  Ejection by Saturn  q = 10 AU  a is fixed

18. Inner Oort Cloud Origin t q ~ a -2 t a ~ 100 Myrs Sampled by Known LPCs (~2.5%) a < 800 AU 20 AU < q < 30 AU

19. Conclusions 2006 SQ 372 and 2000 OO 67 (Elliot et al. 2005) are first detected members of inner Oort Cloud population inside planetary region Pan-STARRS, LSST will discover 100’s to 1000’s of similar bodies Population statistics can provide clues about Oort Cloud and Sun’s dynamical history

20. 20 SDSS Stripe 82 N S RA = 20 hr  120°  RA = 4hr D = +1.25° D = -1.25°  2.5°  SDSS Supernova Survey Sept-Nov 2005-2007 300 square degrees, every 2 nights 5-band photometry Spectroscopic followup

21. Nov 2006; Single Epoch

22. Nov 2006; Quadratic Links

23. Nov 2006; Verified by Orbit Fitting

24. 2006 SQ 372 1 of 63 TNOs observed by SDSS-II SN Survey Diameter < 100 km Orbit: –q: 24.2 AU (between Uranus and Neptune) –a: 796 AU (largest of all TNOs) –i: 20°

25. Results (10° < i < 30°)