Comets have three known reservoirs: the roughly spherical Oort Cloud (for long-period
comets), the flattened Kuiper Belt (for ecliptic comets), and, surprisingly, the asteroid belt (for …

Abstract The Wide-field Imager for Solar PRobe Plus (WISPR) is the sole imager aboard the
Solar Probe Plus (SPP) mission scheduled for launch in 2018. SPP will be a unique mission …

Abstract The Zwicky Transient Facility (ZTF), a public–private enterprise, is a new time-
domain survey employing a dedicated camera on the Palomar 48-inch Schmidt telescope …

Some asteroids eject dust, unexpectedly producing transient, comet-like comae and tails.
First ascribed to the sublimation of near-surface water ice, mass-losing asteroids (also …

This review addresses our current understanding of comets that venture close to the Sun,
and are hence exposed to much more extreme conditions than comets that are typically …

The origin of trace hydrogen in white dwarfs (WDs) with He-dominated atmospheres is a
long-standing problem, one that cannot satisfactorily be explained by the historically …

We present an update to the first white-light detections of a dust trail observed closely
following the orbit of asteroid (3200) Phaethon, as seen by the Wide-field Imager for the …

We present a study of the active asteroid (3200) Phaethon in the 2016 apparition using the
Solar and Terrestrial Relations Observatory (STEREO) spacecraft and compare the results …

Exocomets are small bodies releasing gas and dust which orbit stars other than the Sun.
Their existence was first inferred from the detection of variable absorption features in stellar …

One of the key goals of the Rosetta mission was to understand how, where and when
comets formed in our solar system. There are two major hypotheses for the origin of comets …