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U, B, V, Rc, Ic Photometric Observations of the Dwarf Nova DX Andromedae During the Years 2018-2019
Ciprini, S.; Spogli, C.; Rocchi, G. +1 more
In this paper we present U, B,V, Rc, Ic photometric observations of the dwarf nova DX Andromedae made in the years 2018-2019 at the private Rocchi observatory located in Spello (Umbria). We observed the variable for 86 nights in B, V, Rc, Ic photometric filters. We detected an outburst of this dwarf nova. We summarize the significant variations in…
Accretion in low-mass members of the Orion Nebula Cluster with young transition disks
Alencar, S. H. P.; Gameiro, J. F.; Lima, J. J. G. +3 more
Context. Although the Orion Nebula Cluster is one of the most studied clusters in the solar neighborhood, the evolution of the very low-mass members (M* < 0.25 M⊙) has not been fully addressed due to their faintness.
Aims: Our goal is to verify if some young and very low-mass objects in the Orion Nebula Cluster show e…
Radar Sounding of Subsurface Structure in Eastern Coprates and Capri Chasmata, Mars
Kasaba, Yasumasa; Kumamoto, Atsushi; Oura, Aina +5 more
We surveyed the subsurface structure in eastern Coprates and Capri Chasmata in the equatorial region using high-resolution visible images, digital terrain models, and radar sounding data. We identified subsurface reflectors in four areas of the chasmata. At the stratigraphic exposure on the chasmata walls, the corresponding depth of the reflector …
The ionic composition of the local absorber towards 3C 273
Behar, Ehud; Peretz, Uria; Gissis, Itay
Hot ionized gas is observed in the local vicinity of our galaxy through spectral absorption features. The most common hypothesis is that this gas forms a halo surrounding our Milky Way, in collisional ionization equilibrium. In this paper, we investigate the elemental abundance of this hot and ionized local gas. We use a 2.4 Ms stacked X-ray spect…
Planetary Sensor Models Interoperability Using the Community Sensor Model Specification
Hare, T.; Laura, J. R.; Mapel, J.
This paper presents the photogrammetric foundations upon which the Community Sensor Model specification depends, describes common coordinate system and reference frame transformations that support conversion between image sensor (charge-coupled device) coordinates to some arbitrary body coordinate, and describes the U.S. Geological Survey Astrogeo…
Electrical properties of cometary dust particles derived from line shapes of TOF-SIMS spectra measured by the ROSETTA/COSIMA instrument
Langevin, Yves; Fischer, Henning; Koch, Andreas +21 more
Between Aug. 2014 and Sept. 2016, while ESA's cornerstone mission Rosetta was operating in the vicinity of the nucleus and in the coma of comet 67P/Churyumov-Gerasimenko, the COSIMA instrument collected a large number of dust particles with diameters up to a millimeter. Positive or negative ions were detected by a time-of-flight secondary ion mass…
BV (RI)c photometric study of three variable PMS stars in the field of V733 Cephei
Ibryamov, Sunay; Semkov, Evgeni; Peneva, Stoyanka +1 more
This paper reports results from the first long-term BV (RI)c photometric CCD observations of three variable pre-main-sequence stars collected during the period from February 2007 to January 2020. The investigated stars are located in the field of the PMS star V733 Cep within the Cepheus OB3 association. All stars from our study show rap…
Development of Forecast Algorithm for Coronal Mass Ejection Speed and Arrival Time Based on Propagation Tracking by Interplanetary Scintillation g-Value
Jang, Soojeong; Park, Sa-Rah; Jeon, Ho-Cheol +4 more
We have developed an algorithm for tracking coronal mass ejection (CME) propagation that allows us to estimate CME speed and its arrival time at Earth. The algorithm may be used either to forecast the CME's arrival on the day of the forecast or to update the CME tracking information for the next day's forecast. In our case study, we successfully t…
Thermal Analysis of the Solar Orbiter PHI Electronics Unit
Piqueras, Javier; Rodriguez, Pedro; Torralbo, Ignacio +4 more
Decadal Variability Survey in MACSJ1149
Strolger, Louis-Gregory; Sarajedini, Vicki L.; Della Costa, John, III
We present a long temporal baseline variability survey in the Frontier Field MACSJ1149. In this study, we identify active galactic nuclei (AGNs) and other transient sources via their variability using over a decade of Hubble Space Telescope (HST) images for thousands of galaxies in the cluster region and detect significant variability in galaxies …