Search Publications
Near-infrared Spectroscopy of the Nucleus of Low-activity Comet P/2016 BA14 during Its 2016 Close Approach
Kareta, Theodore; Harris, Walter M.; Reddy, Vishnu +1 more
The near-Earth comet P/2016 BA14 (PanSTARRS) is a slow-rotating, nearly dormant object, a likely dynamical twin of 252P/LINEAR, and was recently shown to have a mid-infrared spectrum very dissimilar to other comets. Comet BA14 was also recently selected as one of the backup targets for the ESA's Comet Interceptor, so a cleare…
The Hipparcos Pleiades Parallax Error is Also a Proper Motion Error
Makarov, V. V.
The mean parallax of the Pleiades open cluster from the Hipparcos catalog is larger than the true value by approximately 1 mas. The origin of this error, as well as a possible algorithm of correcting it, was proposed by Makarov (2002). The problem is reassessed using the more accurate Gaia data with a focus on the predicted correction to the Pleia…
Approach of the Hyades star cluster to the Solar system
Vereshchagin, S. V.; Sizova, M. D.; Emel'yanenko, V. V.
We present the results of calculations of the motion of the Hyades open cluster in the gravitational field of the Galaxy in the recent past. Our calculations show that the recent close passage of Hyades by the Solar system could cause a noticeable shift of the perihelion distances q of comets. The shift is negligible from q = 3 au to 2.6 au for th…
Invited review: Infrared spectroscopy of planetary atmospheres: Searching for insights into their past and present histories
Encrenaz, Thérèse
This article reflects my personal experience and illustrates some developments in the field of planetary spectroscopy, achieved within the Planetology Group of Paris Observatory over the past fifty years. Over these decades, planetary spectroscopy has led to the identification of minor atmospheric species with mixing ratios as low as a few parts p…
Nonlinear Wave and Plasma Structures in the Auroral and Subauroral Geospace
Mishin, Evgeny V.; Streltsov, Anatoly V.
Astrometric observations and analysis of Triton during 2013-2019
Zhang, H. Y.; Yan, D.; Qiao, R. C. +2 more
Triton is the largest irregular satellite of Neptune. A total of 1135 new observed positions of Triton in the period 2013-2019 were collected by the 1.0 m telescopes at Yunnan Astronomical Observatory of CAS during 13 nights. These positions of Triton were obtained based on Gaia DR2 catalogue. We compared our observations to the theoretical positi…
Observations of Current Sheet Heating in X-Ray during a Solar Flare
Reva, A. A.; Kirichenko, A. S.; Ulyanov, A. S. +2 more
In the solar corona, magnetic reconnection occurs due to the finite resistivity of the plasma. At the same time, this resistivity leads to ohmic heating. Therefore, the reconnecting current sheet should heat the surrounding plasma. This paper presents experimental evidence of such plasma heating being caused by magnetic reconnection. We observed t…
Survey for distant solar twins (SDST) - II. Design, observations, and data
Kos, Janez; Martell, Sarah L.; Murphy, Michael T. +5 more
Studies of solar twins have key impacts on the astronomical community, but only ~100-200 nearby solar twins (<1 kpc) have been reliably identified over the last few decades. The aim of our survey (SDST) is to identify ~150-200 distant solar twins and analogues (up to ≲4 kpc) closer to the Galactic Centre. We took advantage of the precise Gaia a…
Scattering and sublimation: a multiscale view of µm-sized dust in the inclined disc of HD 145718
Monnier, John D.; Schaefer, Gail H.; Lanthermann, Cyprien +16 more
We present multi-instrument observations of the disc around the Herbig Ae star, HD 145718, employing geometric and Monte Carlo radiative transfer models to explore the disc orientation, the vertical and radial extent of the near-infrared (NIR) scattering surface, and the properties of the dust in the disc surface and sublimation rim. The disc appe…
Brighter and More Massive Galaxies in the Vicinity of Lyα Nebulae
Wells, Natalie K.; Prescott, Moire K. M.; Finlator, Kristian M.
It has been well established in the local universe that galaxy properties differ based on the large-scale environment in which they reside. As luminous Lyα nebulae have been shown to trace overdense environments at z ~ 2-3, comparing the properties of galaxies within Lyα nebulae systems to those in the field can provide insight into how and when l…