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Binaries in the Vesta Family of Asteroids

Binaries in the Vesta Family of Asteroids. William H. Ryan (NM Tech/MRO) Eileen V. Ryan (NM Tech/MRO) Carlos Martinez (UNM). Project Background:. Multi-apparition Photometric study of Vesta family (asteroids dynamically and chemically linked to Vesta)

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Binaries in the Vesta Family of Asteroids

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  1. Binaries in the Vesta Family of Asteroids William H. Ryan (NM Tech/MRO) Eileen V. Ryan (NM Tech/MRO) Carlos Martinez (UNM)

  2. Project Background: • Multi-apparition Photometric study of Vesta family (asteroids dynamically and chemically linked to Vesta) • Motivation – Difficulty modeling Vesta family (and other families) formation from cratering impact event (Melosh and E. Ryan, 1997; Asphaug 1997) • Other Student Observers during lifetime of project: Amanda Roybal Lawrence Tafoya Lacey Stewart • Facility used: 1.8 m Vatican Advanced Technology Telescope (thanks to VORG, Matt Nelson, & Randy Swift) 19th Annual New Mexico Symposium

  3. September 2001 19th Annual New Mexico Symposium

  4. December 2002 19th Annual New Mexico Symposium

  5. December 2002 19th Annual New Mexico Symposium

  6. December 2002 19th Annual New Mexico Symposium

  7. January 2003 19th Annual New Mexico Symposium

  8. January 2003: Composite 19th Annual New Mexico Symposium

  9. January 2003 (Residuals) 19th Annual New Mexico Symposium

  10. January 2003 (Late Jan. residuals) 19th Annual New Mexico Symposium

  11. January 2003 (Intensity Subtraction) 19th Annual New Mexico Symposium

  12. Analysis of 5 Jan. 2003 Event Dttot Dm Dtplat 19th Annual New Mexico Symposium

  13. Analysis of 5 Jan. 2003 Event ds a q dp 19th Annual New Mexico Symposium

  14. Analysis of 5 Jan. 2003 Event ds a q dp 19th Annual New Mexico Symposium

  15. Summary: 3782 Celle Binary System • Secondary/Primary diameters = 0.43  0.01 • Primary Diameter ~ 6 km (H ~ 12.5) • Primary Rotational Period = 3.84 hours • Orbital Period = 36.57  0.03 hours • Semi-major axis/primary diameter = 3.4  0.2 • Mean density = 2.3  0.4 g/cm3 (Basalt ~ 2.9 g/cm3 HED Meteorites ~ 2.9-3.3 g/cm3) 19th Annual New Mexico Symposium

  16. Binary primaries – Spin vs. Size (Courtesy Petr Pravec) 19th Annual New Mexico Symposium

  17. Binary primaries – Amplitude vs. Spin (Courtesy Petr Pravec) 19th Annual New Mexico Symposium

  18. Binary Asteroids (Courtesy Petr Pravec) 19th Annual New Mexico Symposium

  19. Types of Asteroid Satellites (Courtesy Dan Durda, SWRI) 19th Annual New Mexico Symposium

  20. Binary Formation Mechanisms: • Vesta impact relic - EEB (Durda, et. al., 2003) • Tidal Disruption (Bottke and Melosh, 1996) • Rotational Fragmentation (Giblin, Petit, and Farinella, 1998) • Secondary Impact?? Observe again next apparition (2004) at different geometry to confirm/refine model parameters 19th Annual New Mexico Symposium

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