Eurybates Archives

Irregular satellite orbital inclinations and semimajor axes (normalized to Jupiter’s Hill radius). Family groupings are given as indicated. The prograde population is dominated in mass and number by the Himalia family. The retrograde population is categorized into three orbital families, with the more widely dispersed Pasiphae and Ananke families and the more tightly grouped Carme family. This work studies the Himalia, Carme, Pasiphae, and Ananke families, as well as the isolated satellite Themisto. Orbital parameters from JPL Horizons. -- astro-ph.EP

Astrochemistry, Astrogeology, Biogeochemical Cycles & Geobiology, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Jupiter, Meteorites & Asteroids, Status Report

JWST Reveals Varied Origins Between Jupiter’s Irregular Satellites

by Keith CowingFebruary 5, 2025February 5, 2025

We report observations of eight Jovian irregular satellites with JWST’s NIRSpec instrument: Himalia, Elara, Pasiphae, Sinope, Lysithea, Carme, Ananke, and Themisto. Irregular satellite families, which are presumed to have formed […]

Examples of median-averaged IFU slices obtained with the G235M grating setting for Patroclus and Eurybates. The slices are projected onto the sky plane, with the x and y coordinates corresponding to right ascension and declination, respectively. A logarithmic stretch has been applied to the flux scaling in order to accentuate the detailed structure of the target PSFs at wide separations. The PSF of the Patroclus binary shows an extended shape. The black boxes denote the extraction regions used in producing the spectra. The faint background source near Patroclus lies in a region of the field of view that was masked during our spectral extraction. -- astro-ph.EP

Astrochemistry, Astrogeology, Biochemistry & Organic Chemistry, Comets and Asteroids, Imaging & Spectroscopy, Status Report

JWST Near-infrared Spectroscopy Of The Lucy Jupiter Trojan Flyby Targets: Evidence For OH Absorption, Aliphatic Organics, And CO2

by Keith CowingNovember 23, 2023November 22, 2023

We present JWST/NIRSpec observations of the five Jupiter Trojans that will be visited by the Lucy spacecraft — the Patroclus–Menoetius binary, Eurybates, Orus, Leucus, and Polymele.