Spin clusters inside four young asteroid groups

Author(s)

Carruba, V ^[1] ; Ramos, L. G. M. ^[1] ; Spoto, F. ^[2]

Affiliation

^[1] Sao Paulo State Univ UNESP, Sch Nat Sci & Engn, BR-12516410 Guaratingueta, SP - Brazil

^[2] Univ Cote dAzur, Lab Lagrange, Observ Cate dAzur, CNRS, F-06304 Nice - France

• Document type: Journal article
• Source: Monthly Notices of the Royal Astronomical Society; v. 493, n. 2, p. 2556-2567, APR 2020.
• Web of Science Citations: 0

Abstract

Asteroid groups may either form because of collisions or because of spin induced fission. Recently it has been shown that young spin clusters tend to form more frequently in young collisional families than in older groups. Here, we study the occurrence of spin clusters inside four very recently identified asteroid groups: the (525) Adelaide, (2258) Viipuri, (6142) Tantawi, and (18429) (1994 AO1) groups. Using combinations of techniques based on backward numerical simulations, we identify four spin pairs among the family members. All groups have fractions of observed spin clusters well above 5 per cent, so confirming an observed trend for other young asteroid groups. The (2258) Viipuri and (18429) (1994 AO1) groups are compatible with an origin as a spin clusters themselves, and could be other occurrences of cascade spin clusters, as recently detected in other asteroid groups. Finally, the separation between collisional asteroid families and spin clusters in domains of dispersion of proper semimajor axis, sigma(a), versus age seems to be more complex than previously thought. While spin clusters tend to be much more compact in proper elements than collisional families, there appears to be a transition region in sigma(a) where both the groups be found. (AU)

• FAPESP's process: 13/15357-1 - Long-term effect of the masses (and their uncertainties) of large asteroids on the orbital evolution of terrestrial planetes and minor bodies
• Grantee: Safwan Aljbaae
• Support type: Scholarships in Brazil - Post-Doctorate
• FAPESP's process: 16/04476-8 - Constraints on the terminal ejection velocity fields of asteroid families
• Grantee: Valerio Carruba
• Support type: Regular Research Grants