145 citations · 378 across the 23 of their papers we have counts for
6 papers · 1 filter
A posteriori correction of Gaia CRF proper motions using conditional probability and zero-parallax prior
Valeri V. Makarov
Precision of proper motions and positions given in the Gaia Celestial Reference Frame (CRF) catalog can be statistically improved introducing conditional probability based on the p…
Gaia parallax bias via spherical harmonics: A Python tool and discussion of possible causes
Valeri V. Makarov, Ciprian T. Berghea
Parallaxes in Gaia DR3 are known to suffer from a complex set of sky-correlated and magnitude-dependent offsets or biases at the level of a few tens of as. Estimated from a samp…
Systematic Effects in Gaia CRF Photometry Related to Scanning Geometry and BP/RP excess factor
Valeri V. Makarov
I report a previously undocumented, large-amplitude systematic dependence of the median Gaia -band magnitude of CRF3 sources on \texttt{ra\_dec\_corr}, which reflects the prefer…
The Peculiar Velocity of Messier~87 from Microarcsecond Geodetic VLBI Astrometry
Valeri V. Makarov, Phil Cigan, Kyle Corcoran
Our knowledge of the space velocity of Messier 87, which is the dominant galaxy in the Virgo cluster, has been limited to the radial velocity component. Using a cadence of precisio…
Kinematic Distortions of the High-Redshift Universe as Seen from Quasar Proper Motions
Valeri V. Makarov
Advances in optical astrometry allow us to infer the non-radial kinematic structure of the Universe directly from observations. Here I use a supervised machine learning neural netw…
Optical variability of Gaia CRF3 sources with robust statistics and the 5000 most variable quasars
Valeri V. Makarov
Using the light curve time series data for more than 11.7 million variable sources published in the Gaia Data Release 3, the average magnitudes, colors, and variability parameters…