Extended Data Table 1 List of 83 CDA mass spectra identified as of HMOC type

From: Macromolecular organic compounds from the depths of Enceladus

  1. The columns of the table show the number of the spectrum (#, in order of detection); the time of detection in coordinated universal time (UTC) and as measured by the spacecraft clock (SCLK); the amplitude of charge measured at the CDA ion grid (QI (C)); the spacecraft’s distance to Saturn’s rotation axis (R(RS); where RS = 60,268 km is Saturn’s radius); the spacecraft’s distance to the ring plane (Z(RS)); grain impact speeds (in kilometres per second, see below); and the corresponding grain radii estimates (in micrometres). For the grain impact speeds, the velocity Vimp is derived assuming that grains are in circular Keplerian orbits, and Vσ and V+σ are the ±1σ of the grain impact speed distributions, inferred from an E-ring model derived from numerical simulations73,74. The grain radii shown in the last three columns are calculated on the basis of Vimp, Vσ and V+σ using equation (3.37) of ref. 78.
  2. Events for which the UTC time is shown in bold fonts are the 64 high-quality spectra (see Methods, ‘Selection of 64 high-quality spectra for Fig. 1 and Extended Data Figs. 1 and 3’). Speeds marked with an asterisk denote spectra in which one or more hydrogen cations (H+, H2+, H3+) are present, which is used as an independent and reliable criterion for impact speeds larger than 10 km s−1 even if the number derived from the assumption of circular orbits (Vimp) is lower.