Energy distribution for comet Halley

Thermal energy distribution of comet Halley have been obtained by using the data available from the Indian astronomical ephemeris. The magnitude vs wavelength, plots have also been enumerated and discussed.     

Laboratory studies on cometary molecules

We show results for some new bands of C₂, CN, N₂ ⁺, CO⁺, NH, OH, and CH hitherto unidentified, but expected to be present in the spectrum of comets by the analysis of Franck-Condon factors. Vibrational transition probabilities, Franck-Condon factors have been evaluated by an approxximate analytical method for the A-X system of C₂, A-X, and B-X systems of CN, B-X system of N₂ ⁺, A-X, and B-A systems of CO ⁺ , A-X system of NH and A–X system of OH.