Search Publications
Gravity Wave Modulations at the Lower Altitudes of Venus Ionosphere
Choudhary, R. K.; Imamura, T.; Ambili, K. M. +2 more
Using measurements from radio science experiments onboard Venus Express and Akatsuki orbiter, we explore factors that control the occurrence and spatial structure of the electron density enhancement at lower altitudes (V0 layer) in the Venus ionosphere. Results suggest that the Gravity Waves (GWs) play a crucial role in determining the …
The orbits of outer planetary satellites using the Gaia data
Emelyanov, N. V.; Kovalev, M. Yu; Varfolomeev, M. I.
Launch of the Gaia space observatory started a new era in astrometry when the accuracy of star coordinates increased by thousands of times. Significant improvement in accuracy was also expected for the coordinates of the Solar system bodies. Gaia Data Release 3 (DR3) provided us with the data that could be used to test our expectations. In this wo…
Variable stars in the field of the Galactic bulge globular cluster NGC 6522
Arellano Ferro, A.; Luna, A.; Prudil, Z. +2 more
We present a comprehensive analysis of the variable stars projected on the field of the Galactic bulge globular cluster NGC 6522, offering valuable insights into their characteristics. Using proper motions from Gaia-DR3, we aim to distinguish between field stars and true cluster members. For an accurate color-magnitude diagram of the member stars,…
A new shape model of the bilobate comet 67P/Churyumov-Gerasimenko
Chen, Min; Huang, Xianfeng; Yan, Jianguo +2 more
In this article, we performed the stereo-photogrammetric processing on over 5200 Rosetta/OSIRIS-NAC images to derive a global high-resolution 3D model of the bilobate comet 67P/Churyumov-Gerasimenko, which is visually richer and more convincing than the existing models (i.e., SPG-SHAP4S, SPC-SHAP5 and SPG-SHAP7). This shape model was used to gener…
Active Asteroid 311P/PanSTARRS: Rotational Instability as the Origin of its Multitails?
Li, Fei; Liu, Bin; Liu, Xiaodong +3 more
The active asteroid 311P/PanSTARRS is one of the two targets of the planned Chinese asteroid exploration mission Tianwen-2. During 2013, 311P experienced several mass-loss events and exhibited multiple comet-like tails. Here we analyze the morphology and surface brightness of the tails to investigate the dust environment around the nucleus and the…
Population of X-Ray Sources in the Intermediate-age Cluster NGC 3532: a Test Bed for Machine-learning Classification
Kargaltsev, Oleg; Chen, Steven; Yang, Hui +4 more
Open clusters are thought to be the birthplace of most stars in the galaxy. Thus, they are excellent laboratories for investigating stellar evolution, and X-ray properties of various types of stars (including binary stars, evolved stars, and compact objects). In this work, we investigate the population of X-ray sources in the nearby 300 Myr old op…
The Bolometric Bond Albedo of Enceladus
West, Robert A.; Nixon, Conor A.; Fry, Patrick M. +13 more
The bolometric Bond albedo is a fundamental parameter of planets and moons. Here, combined observations from the Cassini spacecraft and the Hubble Space Telescope are used to determine the bolometric Bond albedo of Enceladus. We provide the full-disk reflectance of Enceladus across all phase angles (0° -180°) from 150 nm to 5131 nm, a spectral ran…
Infrared Galaxies Detected by the Atacama Cosmology Telescope
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +4 more
We report on 167 infrared (IR) galaxies selected by AKARI and IRAS and detected in the Atacama Cosmology Telescope (ACT) Data Release 5 (DR5) sky maps at the 98, 150, and 220 GHz frequency bands. Of these detections, 134 (80%) of the millimeter counterparts are first-time identifications with ACT. We expand the previous ACT extragalactic source ca…
Spectral Analysis of Clay-bearing Outcrops in Northern Xanthe Terra, Mars: Comparison with Oxia Planum, the Landing Site for the ExoMars Rover Mission
Altieri, Francesca; Brossier, Jeremy; De Sanctis, Maria Cristina +5 more
Clay minerals detected on Mars are valuable targets to seek traces of life on the planet, where biosignatures might be preserved. Here, we report an in-depth spectral analysis of clay-rich outcrops identified in northern Xanthe Terra (300°-320° E, 10°-20° N). We focused particularly on the absorptions centered in the 1.0-2.6 µm spectral rang…
XMM-Newton observation of V1504 Cyg as a probe for the existence of an evaporated corona
Ness, J. -U.; Dobrotka, A.; Nucita, A. A. +1 more
Aims: We present an analysis of an XMM-Newton observation of the dwarf nova V1504 Cyg during the decline from an outburst. Our goal is to search for evidence of an evaporated X-ray corona. Such a corona can be understood as an optically thin and geometrically thick disc around the central part of an optically thick and geometrically thin disc…