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HD 284145


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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.

Lunar occultation summary. III
Observations of 242 photoelectric lunar occultation events studied atErwin W. Fick Observatory are reported. Approximately one-fourth ofthese are reappearances. From each observation are estimated the minimummagnitude differences between the observed object and possibleundetected companions. Occultation observations are given of 23 starsbrighter than 6th mag, including Alpha Vir, Beta-1 Sco, Mu Gem, Xi-2Sgr, Zeta Tau, Lambda Gem, and Beta Cap.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Boga
Sað Açýklýk:04h04m56.53s
Yükselim:+20°51'23.3"
Görünürdeki Parlaklýk:8.991
Uzaklýk:122.699 parsek
özdevim Sað Açýklýk:13.7
özdevim Yükselim:-51.2
B-T magnitude:10.028
V-T magnitude:9.077

Kataloglar ve belirtme:
Özgün isimleri
HD 1989HD 284145
TYCHO-2 2000TYC 1262-1459-1
USNO-A2.0USNO-A2 1050-01132145
HIPHIP 19054

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