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Detection of an excessively strong 3-µm absorption near the lunar highland crater Dufay
Wöhler, C.; Grumpe, A.; Bhatt, M. +3 more
Using the near-infrared spectral reflectance data of the Chandrayaan-1 Moon Mineralogy Mapper (M3) instrument, we report an unusually bright structure of 30 × 60 km2 on the lunar equatorial farside near crater Dufay. At this location, the 3-µm absorption band feature, which is commonly ascribed to hydroxyl (OH) and/or w…
Molecular clumps towards compact H II regions
Gómez, M.; Rubio, M.; Cappa, C. E. +1 more
To better understand how the H II regions can affect their surrounding molecular clouds we have studied the molecular distribution towards three compact H II regions associated with IRAS sources (08140-3559, 09014-4736, and 09026-4842) by means of the observations of 12CO, 13CO, and C18O molecules in the J = 3-2 tr…
Constraints on the number of X‑ray pulsars in IC 10 from a deep XMM‑Newton observation
Wik, D. R.; Yang, J.; Laycock, S. G. T.
We report the most sensitive search yet for X‑ray pulsars in the dwarf starburst galaxy IC 10, which is known to contain a population of young, high‑mass X‑ray binaries. We searched for pulsations in 207 point‑like X‑ray sources in the direction of IC 10 by a 2012 XMM‑Newton observation with a total exposure time of 134.5 ks. Pulsation searches in…
Improvement of positional accuracy of Solar system bodies ground-based observations with CCD-imaging of close approaches of them with Gaia stars
Bikulova, D. A.
Current release of the Gaia mission provides representation of a new reference frame on an unprecedent level of accuracy. This astrometric catalogue is practically free of systematic errors with respect to astrometric ground-based observations. First applications Gaia DR1 and Gaia DR2 as a reference in an analysis of CCD-observations of asteroids …
a Generic Rigorous Sensor Model for Photogrammetric Processing of Pushbroom Planetary Images
Geng, X.; Xu, Q.; Xing, S.
Currently, each planetary exploration mission team always develops its own software modules to support the photogrammetric processing of planetary images, and as a result of that the main drawbacks are lacking software reusability and the high cost of software development and maintenance. This is mainly due to that there is lack of a highly univer…
Independent study and spectral classification of a sample of poorly studied high proper motion M-dwarf candidate stars
Merc, J.; Csörnyei, G.; Cabello, C. +2 more
We report an independent spectral classification of a sample of poorly studied M-dwarf candidate stars observed with the OSIRIS instrument at GTC. Our project was carried out as an independent test of the spectral classification. It is crucial for the studies of extrasolar planets orbiting M-dwarfs, since properties of the host star are directly r…
XMM-Newton and Chandra Observations of the Unidentified Fermi-LAT Source 3FGL J1016.5-6034: A Young Pulsar with a Nebula?
Kargaltsev, Oleg; Younes, George; Hare, Jeremy +2 more
We report the discovery of a bright X-ray source in the XMM-Newton and Chandra X-Ray Observatory (Chandra) images of the unidentified Fermi-LAT source 3FGL J1016.5-6034. The XMM-Newton spectrum of the source is well fit by an absorbed blackbody+power-law model with a temperature kT = 0.20 ± 0.02 keV and photon index Γ = 1.8 ± 0.1. Chandra resolves…
Characterization of the Agilkia region through discrete-element simulation of Philae's rebound
Grieger, Björn; Küppers, Michael; Wu, Xiaoyu +1 more
Context. The cold gas system and anchoring harpoons that were designed to hold Philae down after it landed on the Agilkia region of comet 67P/Churyumov-Gerasimenko (67P) failed. This caused the lander to move on a complex trajectory that comprised multiple impacts and rebounds. The motion of Philae was mainly dominated by the gravitational environ…
Pushing Automated Abundance Derivations into the Cool Dwarf Regime: A Test Using Three G and Two K Stars in Praesepe
Hawkins, Keith; Agüeros, Marcel A.; Schuler, Simon C. +2 more
We present the results of an abundance analysis of three G and two K dwarfs in the Praesepe open cluster based on high-resolution, moderate signal-to-noise-ratio spectra obtained with the ARC 3.5 m Telescope at Apache Point Observatory. Using a principal component analysis and the BACCHUS automated spectral analysis code, we determined stellar par…
Slitless Solar Imaging Spectroscopy
Kamalabadi, Farzad; Davila, Joseph M.; Oktem, Figen S.
Spectrometers provide our most detailed diagnostics of the solar coronal plasma, and spectral data is routinely used to measure the temperature, density, and flow velocity in coronal features. However, spectrographs suffer from a limited instantaneous field of view (IFOV). Conversely, imaging instruments can provide a relatively large IFOV, but ex…