Home     Getting Started     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astro Photo     The Collection     Forum     Blog New!     FAQ     Press     Login  

TYC 2271-1988-1


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

Validation of the new Hipparcos reduction
Context: A new reduction of the astrometric data as produced by theHipparcos mission has been published, claiming accuracies for nearly allstars brighter than magnitude Hp=8 to be better, by up to a factor 4,than in the original catalogue. Aims: The new Hipparcosastrometric catalogue is checked for the quality of the data and theconsistency of the formal errors as well as the possible presence oferror correlations. The differences with the earlier publication areexplained. Methods: The internal errors are followed through thereduction process, and the external errors are investigated on the basisof a comparison with radio observations of a small selection of stars,and the distribution of negative parallaxes. Error correlation levelsare investigated and the reduction by more than a factor 10 as obtainedin the new catalogue is explained. Results: The formal errors onthe parallaxes for the new catalogue are confirmed. The presence of asmall amount of additional noise, though unlikely, cannot be ruled out.Conclusions: The new reduction of the Hipparcos astrometric dataprovides an improvement by a factor 2.2 in the total weight compared tothe catalogue published in 1997, and provides much improved data for awide range of studies on stellar luminosities and local galactickinematics.

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:


Observation and Astrometry data

Constellation:Andromède
Right ascension:00h00m48.64s
Declination:+36°46'39.4"
Apparent magnitude:10.232
Proper motion RA:-25.8
Proper motion Dec:-12.8
B-T magnitude:11.144
V-T magnitude:10.308

Catalogs and designations:
Proper Names   (Edit)
TYCHO-2 2000TYC 2271-1988-1
USNO-A2.0USNO-A2 1200-00007204
HIPHIP 70

→ Request more catalogs and designations from VizieR