25 citations · 64 across the 11 of their papers we have counts for
12 papers
High-resolution optical spectroscopy reveals the distinctive volatile composition of the interstellar comet 3I/ATLAS
K. Aravind, E. Jehin, C. Opitom +9
Comets preserve volatile material from the early stages of planetary-system formation. The discovery of the interstellar comet 3I/ATLAS enables a direct comparison between a comet…
Post-perihelion Photometric and Spectroscopic Monitoring of the Interstellar Comet 3I/ATLAS
Goldy Ahuja, Shashikiran Ganesh, K. Aravind +12
The third interstellar object, comet 3I/ATLAS, was observed using various Indian telescopes during its post-perihelion evolution. We carried out imaging and spectroscopic observati…
Activity and composition of periodic comets 67P/Churyumov-Gerasimenko and 103P/Hartley 2 at two different perihelion passages
E. Hemmen, M. Vander Donckt, E. Jehin +6
Through photometry and spectroscopy, we studied the evolution of the activity and chemical composition of comet 67P during its 2025 and 2021 perihelion passages and of comet 103P d…
Dust, gas activity and morphology of comet 12P/Pons-Brooks at heliocentric distances beyond 1.1 au
Marek Husárik, Gulchehra Kokhirova, Valerii Kleshchonok +6
Comet 12P/Pons-Brooks is a periodic comet with an orbital period of approximately 71 years. Because of the period duration, aphelion of 35.3 au, and highly inclined orbit (74.2 deg…
Long-term monitoring of a dynamically new comet C/2020 V2 (ZTF)
Goldy Ahuja, K. Aravind, Shashikiran Ganesh +5
Comet C/2020 V2 (ZTF) is categorized as a dynamically new long-period comet, making its first approach to the inner Solar system. We have observed this comet for around 32 months (…
Very Large Telescope Observations of Interstellar Comet 3I/ATLAS. II. From Quiescence to Glow: Dramatic Rise of Ni i Emission and Incipient CN Outgassing at Large Heliocentric Distances*
Rohan Rahatgaonkar, Juan Pablo Carvajal, Thomas H. Puzia +25
We report VLT spectroscopy of the interstellar comet 3I/ATLAS (C/2025~N1) from to ~au using X-shooter (300--550\,nm, ) and UVES (opt…
Optical spectroscopy of comets using Hanle Echelle Spectrograph (HESP)
K Aravind, Kumar Venkataramani, Shashikiran Ganesh +5
Observing the vibrational/rotational lines in a comet's optical spectrum requires high-resolution spectroscopy, as they are otherwise seen as a blended feature. To achieve this, we…
Long-term spectroscopic monitoring of comet 46P/Wirtanen
K. Aravind, Kumar Venkataramani, Shashikiran Ganesh +2
Jupiter Family Comets (JFCs), having orbital period less than 20 years, provide us with an opportunity to observe their activity and analyse the homogeneity in their coma compositi…
Optical spectroscopy of comets
K. Aravind, Shashikiran Ganesh
Comets are pristine remnants of the Solar system, composed of dust and ice. They remain inactive and undetectable for most of their orbit due to low temperatures. However, as they…
Optical observations and dust modelling of comet 156P/Russell-LINEAR
K. Aravind, Prithish Halder, Shashikiran Ganesh +5
Comet 156P/Russell-LINEAR is a short period Jupiter family comet with an orbital period of 6.44 years. The results from spectroscopic, photometric, polarimetric observations and du…
Activity of the first interstellar comet 2I/Borisov around perihelion: Results from Indian observatories
Aravind Krishnakumar, Shashikiran Ganesh, Kumar Venkataramani +4
Comet 2I/Borisov is the first true interstellar comet discovered. Here we present results from observational programs at two Indian observatories, 2 m Himalayan Chandra Telescope a…
EMPOL: an EMCCD based optical imaging polarimeter
Shashikiran Ganesh, Archita Rai, Aravind K +12
An Andor 1K 1K EMCCD detector has been used to develop an optical imaging polarimeter for use at the Cassegrain focus of 1.2 m telescope of PRL. The optics is derived from…