Essays about: "Hipparcos"
Showing result 1 - 5 of 8 essays containing the word Hipparcos.
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1. Combining Hipparcos and Gaia data: Improved Astrometric Calculations With Orvara
University essay from Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionenAbstract : Hipparcos and Gaia are two missions intended to catalogue positions and motions of stellar objects. Orvara is a computer program which aims to combine the data from these two missions to calculate Keplerian parameters for stellar systems. READ MORE
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2. Re-examining the dynamics of the Milky Way with new distance estimates
University essay from Lunds universitet/Astronomi - Genomgår omorganisationAbstract : The use of reliable distance estimates is key to derive accurate three-dimensional velocities of celestial objects. Systematic overestimation and large uncertainties in the distances will thus provide misleading information of an object's kinematics. READ MORE
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3. Assessing the Improvements GAIA-DR1 Will Bring to Dynamical Astronomy
University essay from Lunds universitet/Astronomi - Genomgår omorganisationAbstract : The first part of this thesis deals with the dynamical estimation of the Oort constants using proper motions and parallaxes provided from the Gaia-DR1 TGAS catalogue. The photometric information was provided by the 2MASS catalogue. READ MORE
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4. Radial migration of stars, measured in N-body simulations
University essay from Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisationAbstract : The purpose of Galactic archaeology is determining the history of the Milky Way (MW) Galaxy. To do this one uses observational data from stellar populations in terms of properties such as kinematics, chemistry, ages, and evolution. READ MORE
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5. A kinematic check of the distance scale of Galactic Cepheids
University essay from Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation; Lunds universitet/Astronomi - Genomgår omorganisationAbstract : A selection of well known period luminosity relations for cepheid variables are studied under the assumption that cepheid variables have a mean vertical velocity of zero in the galactic plane. Proper motion data from Hipparcos and Thyco-2 catalogues are coupled with the distances obtained from applying the period luminosity relations on a database of known classical cepheids to calculate the velocities of the cepheids. READ MORE