Preliminary Results of Venus Transit of June 8, 2004 Observed in Hα 6563 Å
Abstract
The rare cosmic event of Venus transit across the solar disk occurred on 8th June 2004, i.e. ~ 122 years after the last such event which occurred in observed on 6 December 1882. The event was observed at Udaipur Solar Observatory using full-disk, as well as, small field-of-view high resolution solar telescopes, and recorded in the nearly monochromatic light of Hα 6563 Å. High resolution solar images were taken at a cadence of 3 seconds during the period 05:10-05:30 UT which covered the Ist and IInd contacts of Venus. This was repeated during the period 11:10-11:30 UT covering the IIIrd and IVth contacts, while the images were obtained at a lower cadence between the period of the IInd and IIIrd contacts. Altogether, around 4000 filtergrams were obtained. We have compared our observations with the multi-wavelength data obtained from TRACE satellite. We studied the optical effects that cause the "black-drop" and the "atmospheric-glow" around Venus at the time of its I-II, and III-IV contacts. We have also compared the difference in contact timings observed in different wavelength bands.
- Publication:
-
Bulletin of the Astronomical Society of India
- Pub Date:
- September 2005
- Bibcode:
- 2005BASI...33..366R