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HD 287257


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The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.

Occultations of stars by solar system objects. VIII - Occultations of catalog stars by asteroids, planets, Titan, and Triton in 1990 and 1991
Predictions are given for occultations of catalog stars by asteroids,planets, Titan, and Triton in 1990 and 1991. The predictions are basedon a computerized comparison of the occulting bodies' ephemerides andnine major star catalogs. The search is complete for all numberedasteroids whose angular diameters exceed 0.08 arcsec during the searchyears. Preliminary ground tracks are shown for the more favorableoccultations.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Avci
Sað Açýklýk:04h58m59.88s
Yükselim:+13°41'26.8"
Görünürdeki Parlaklýk:9.996
özdevim Sað Açýklýk:-12.5
özdevim Yükselim:-14
B-T magnitude:10.673
V-T magnitude:10.052

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 287257
TYCHO-2 2000TYC 697-447-1
USNO-A2.0USNO-A2 0975-01252686
HIPHIP 23162

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