Results 1 to 10 of about 8,833 (325)
The genome sequence of the Blood-vein moth, Timandra comae Schmidt, 1931 [version 1; peer review: 2 approved] [PDF]
Wellcome Open ResearchWe present a genome assembly from an individual male Timandra comae (the Blood-vein; Arthropoda; Insecta; Lepidoptera; Geometridae). The genome sequence is 334.4 megabases in span.
Denise C. Wawman
doaj +3 more sources
Dynamic molecular oxygen production in cometary comae [PDF]
Nature Communications, 2017 Abundant molecular oxygen was discovered recently in the coma of comet 67P, thought to be of primordial origin. Here, the authors propose a dynamic reaction mechanism for cometary comae, which produces O2directly in single collisions of energetic water ...
Yunxi Yao, Konstantinos P. Giapis
doaj +3 more sources
On the origin of molecular oxygen in cometary comae [PDF]
Nature Communications, 2018 We have used generous assumptions in terms of production rates and ion fluxes to assess the production of O2- through ER reactions as a mechanism to explain Rosetta observations. Even with these assumptions, the amount of O2 produced is insignificant (by
K. L. Heritier +16 more
doaj +3 more sources
Reply to “On the origin of molecular oxygen in cometary comae” [PDF]
Nature Communications, 2018 Laboratory experiments suggest that the molecular oxygen, detected in the coma of comet 67P, is produced in part by abstraction reactions of cometary water ions at exposed surfaces on the nucleus and on the spacecraft.
Y. Yao, K. P. Giapis
doaj +3 more sources
Shock-induced nucleation of nanophase Fe-Ni alloy and its implications for interstellar iron reservoirs [PDF]
Frontiers in ChemistryShock waves are ubiquitous in star-forming regions, protoplanetary disks, and cometary environments, yet their role in processing refractory metals remains poorly understood.
Prakash Velampatti Selvaraj +2 more
doaj +2 more sources
Odessa Astronomical Publications, 2016 We show that, contrary to simple predictions, most AGNs show at best only a small increase of lags in the J, H, K, and L bands with increasing wavelength.
V. L. Oknyansky +2 more
doaj +3 more sources
A CCD photometric study of the late type contact binary EK Comae Berenices
New Astronomy, 2010 We present CCD photometric observations of the W UMa type contact binary EK Comae Berenices using the 2 metre telescope of $IUCAA$ Girawali Observatory, India. The star was classified as a W UMa type binary of subtype-W by \citet{sam1996}. The new V band
Harinder P Singh, Ranjan Gupta
exaly +3 more sources
Dark Comets? Unexpectedly Large Nongravitational Accelerations on a Sample of Small Asteroids
The Planetary Science Journal, 2023 We report statistically significant detections of nonradial, nongravitational accelerations based on astrometric data in the photometrically inactive objects 1998 KY _26 , 2005 VL _1 , 2016 NJ _33 , 2010 VL _65 , 2016 RH _120 , and 2010 RF _12 .
Darryl Z. Seligman +17 more
doaj +1 more source
Dust Outburst Dynamics and Hazard Assessment for Close Spacecraft–Comet Encounters
The Planetary Science Journal, 2021 Using the gas drag by sublimating cometary surface ices for the acceleration of dust particles and deceleration by the gravity field of the nucleus combined with basic laws of mechanics, the sizes, velocities, and number densities of escaping particles ...
Uwe Fink +6 more
doaj +1 more source
The Astronomical Journal, 2023 Short-period comet 108P/Ciffreo is known for its peculiar double morphology, in which the nucleus is accompanied by a comoving, detached, diffuse “blob.” We report new observations of 108P/Ciffreo taken with the Hubble Space Telescope and the Nordic ...
Yoonyoung Kim +4 more
doaj +1 more source