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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.
| Optical identification of the millisecond pulsar 1937 + 214
A 20th magnitude red object, undetectable on the Palomar Sky Surveyprints, is proposed as an optical identification candidate for themillisecond pulsar. The image containing the object was obtained fromthree CCD exposures, one of 300 s and two of 600 s, which were filteredto remove cosmic ray events, offset into coincidence, and digitallystacked together to increase the signal-to-noise ratio. The part of theresulting image containing the object is shown, and several stars in thefield are listed. The procedure for locating the optical candidate isdescribed; the candidate is about one sigma error box from the radioposition.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Tilkicik |
| Sað Açýklýk: | 19h40m35.91s |
| Yükselim: | +21°32'25.5" |
| Görünürdeki Parlaklýk: | 9.416 |
| özdevim Sað Açýklýk: | 15.3 |
| özdevim Yükselim: | 3.5 |
| B-T magnitude: | 9.682 |
| V-T magnitude: | 9.438 |
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