![Example of the stacking procedure for the Maidanak data obtained on 2025 August 15, based on ten 60 s exposures in each of the B, V , and R filters. Left: Comet-centered stack, showing the coma morphology without trailing of the comet signal. The pink circle indicates an aperture radius of 10 000 km. Right: Sidereal stack used for photometric calibration, in which the comet appears trailed.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/The-Inbound.png?resize=1200%2C720&ssl=1)
[astro-ph.EP] Interstellar objects (ISOs) provide direct constraints on the composition and evolution of extrasolar planetary systems. As the third confirmed ISO, comet 3I/ATLAS offers a rare opportunity to study pristine […]
Comet
Posted inComets and Asteroids
An Enriched Methane D/H Ratio in the Interstellar Object 3I/ATLAS
[astro-ph.EP]. Interstellar objects are interlopers from other planetary systems, and their volatile compositions provide a glimpse into planet formation around their host star.
Outer Planets Assessment Group (OPAG) Meeting (Hybrid)
Dear OPAG Community, We are pleased to announce that the Outer Planets Assessment Group will host a Community meeting September 22-23, 2026. This meeting will be a virtual meeting and will […]
Workshop on the Integrated Science of Comets
11 AUG UPDATE: The Workshop on the Integrated Science of Comets: From Laboratory Studies of Cometary Materials to Remote Observations is scheduled for September 22–24, 2026, at the Lunar and Planetary Institute (LPI) in […]
![Herschel H2 column density map (Sadavoy et al. 2012) of Perseus starless and prestellar cores. Labeled in magenta are the locations and names of the 15 starless and prestellar cores analyzed. The star-forming regions within Perseus are denoted in black.-- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Inventories.png?resize=1200%2C716&ssl=1)
Posted inAstrochemistry
Inventories of Rich Carbon-Chain Chemistry in Prestellar and Starless Cores in the Perseus Molecular Cloud
[astro-ph.GA] Carbon-chain molecules serve as an important reservoir of reactive organic matter that will eventually be incorporated into protoplanetary disks, planets, and cometary material. Prestellar and starless cores are composed […]
Hayabusa Symposium 2026
The Hayabusa Symposium 2026 brings together researchers studying extraterrestrial samples, focusing on Hayabusa, Hayabusa2, OSIRIS-REx, upcoming MMX, and the other future missions like NGSR. With Ryugu and Bennu samples now […]
Posted inComets and Asteroids
A JWST Study of Stardust. I. Infrared Spectroscopy of Comet 81P/Wild 2 and Overall Composition
[astro-ph.EP] We report observations of comet 81P/Wild 2, target of the Stardust sample return mission, on UT 2023 March 20 and 24 at a heliocentric distance (rH) of 1.85 au […]
Posted inComets and Asteroids
Gelato: A Mission Concept for Comet Surface Sample Return
[The Planetary Science Journal] Understanding the role of comets in solar system formation and evolution has continued to be a driving question in planetary science. It is believed that comets […]
Posted inAstrochemistry
An Interstellar Energetic And Non-aqueous Pathway To Peptide Formation
[astro-ph.SR] The origin of the molecular building blocks of life is a central question in science. A few α-amino acids such as glycine, the simplest proteinogenic amino acid, have been […]
Posted inComets and Asteroids
A Comprehensive Study Of Comet 67P/Churyumov-Gerasimenko In The 2021/2022 Apparition. II. Colorimetry, Polarimetry, Modeling
[astro-ph.EP] This paper presents the second part of our multi-technique observational study of comet 67P during its 2021-2022 apparition. While the first paper focused on photometry and spectroscopy, here we […]