Star catalog position and proper motion corrections in asteroid astrometry II: The Gaia era
Sign Up to like & getrecommendations! Published in 2020 at "Icarus"
DOI: 10.1016/j.icarus.2014.07.033
Abstract: Abstract We provide a scheme to correct asteroid astrometric observations for star catalog systematic errors due to inaccurate star positions and proper motions. As reference we select the most accurate stars in the PPMXL catalog,… read more here.
Keywords: catalog; star catalog; astrometry; star ... See more keywords
Compact vs. Scattered: Suitability of Southern 6.7 GHz Methanol Masers for VLBI astrometry
Sign Up to like & getrecommendations! Published in 2025 at "Publications of the Astronomical Society of Australia"
DOI: 10.1017/pasa.2025.10119
Abstract: Abstract The 6.7 GHz methanol maser transition is exclusively associated with young, high-mass stars and represents a potential target for astrometric studies, including accurate determination of their distance through trigonometric parallax measurements. There are more… read more here.
Keywords: astrometry; ghz; southern ghz; methanol masers ... See more keywords
Optimality of the maximum likelihood estimator in astrometry
Sign Up to like & getrecommendations! Published in 2018 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201732537
Abstract: The problem of astrometry is revisited from the perspective of analyzing the attainability of well-known performance limits (the Cramer-Rao bound) for the estimation of the relative position of light-emitting (usually point-like) sources on a CCD-like… read more here.
Keywords: weighted least; estimator; maximum likelihood; likelihood estimator ... See more keywords
Development of the Warm Astrometric Mask for MICADO Astrometry Calibration
Sign Up to like & getrecommendations! Published in 2019 at "Publications of the Astronomical Society of the Pacific"
DOI: 10.1088/1538-3873/ab0c40
Abstract: The achievement of $\mu$arcsec relative astrometry with ground-based, near infrared, extremely large telescopes requires a significant endeavour of calibration strategies. In this paper we address the removal of instrument optical distortions coming from the ELT… read more here.
Keywords: mask; micado; calibration; development warm ... See more keywords
Lessons learned from the detection of wide companions by radial velocity and astrometry
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DOI: 10.1093/mnras/staf689
Abstract: The detection and constraint of the orbits of long-period giant planets is essential for enabling their further study through direct imaging. Recently, it has been highlighted that there are discrepancies between different orbital fitting solutions.… read more here.
Keywords: detection; astrometry; wide companions; detection wide ... See more keywords
Cosmology and Astrometry
Sign Up to like & getrecommendations! Published in 2018 at "Astronomy Reports"
DOI: 10.1134/s1063772918120132
Abstract: It has recently become clear that the potential role of astrometry in cosmological studies has been underestimated. Some areas of cosmology that should be investigated using astrometrical methods are discussed. This paper is based on… read more here.
Keywords: cosmology; cosmology astrometry; astrometry; astronomy ... See more keywords