Contenuti
Immagini
Carica la tua immagine
DSS Images Other Images
Articoli relazionati
Photographic astrometry against a bright sky - Theory and application
Theoretical, experimental, and statistical arguments are given todemonstrate that daytime astrometry can be a viable technique in somecircumstances. In particular, a scheme is outlined for a daytimeobservation of the gravitational deflection of light by the sun.Detailed examination of the photographic astrometry approach shows thatthe accuracy expected from a single plate exposed to a star field aboutthe sun is expressible in terms of the uncertainties with which thepositions of the images are determined. An experimental determination isperformed, yielding the astrometric positional accuracy as a function ofthe magnitude of the star, the brightness of the background, and thesensitivity of the measurement process. This result is extrapolated tothe light-deflection configuration by using measurements of skybrightness as a function of observer altitude and the angular separationof the observed region of sky from the sun. Application to star fieldsalong the ecliptic indicates an expected accuracy of 1% to be attainablefrom 85 to 200 plates.
| Spectral and Luminosity Classification of the Bright Sequence Stars in the C Regions.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1955ApJ...121...32N&db_key=AST
|
Sottometti un nuovo articolo
Link relazionati
Sottometti un nuovo link
Membro dei seguenti gruppi:
|
Osservazione e dati astrometrici
| Costellazione: | Pesci |
| Ascensione retta: | 01h06m33.83s |
| Declinazione: | +16°21'47.8" |
| Magnitudine apparente: | 9.081 |
| Moto proprio RA: | 6.6 |
| Moto proprio Dec: | -9.1 |
| B-T magnitude: | 9.676 |
| V-T magnitude: | 9.131 |
Cataloghi e designazioni:
|
