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We carried out observations of a peculiar comet, C/2016 R2 (Pan-STARRS),using a low resolution spectrograph mounted on the 1.2m telescope at Mount AbuInfrared Observatory, India. The comet was observed on two dates in January2018, when it was at a heliocentric distance of 2.8 AU. Study based on ourobservations revealed that the optical spectrum of this comet is quite unusualas compared to general cometary spectra. Most of the major cometary emissionslike C$_{2}$, C$_{3}$ and CN were absent in comet C/2016 R2. However, the cometspectrum showed very strong emission bands from ionic species like CO$^{+}$ andN$_{2}^{+}$. A mean N$_{2}$/CO ratio of 0.09 $\pm$ 0.02 was derived from thespectra and an extremely low depletion factor of 1.6 $\pm$ 0.4 has beenestimated for this ratio as compared to the solar nebula. We have also detectedminor emission features beyond 5400 Angstroms, albeit marginally. The columndensities of CO$^{+}$ and N$_{2}^{+}$ were calculated from their emissionbands. The optical spectrum suggests that the cometary ice is dominated by CO.The low depletion factor of N$_{2}$/CO ratio in this comet, as compared to thesolar nebula and the unusual spectrum of the comet are consequences ofdistinctive processing at the location of its formation in the early solarnebula.

Ionic emissions in comet C/2016 R2 (Pan-STARRS)