Kumar Venkataramani
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View article: Deep Learning to Improve the Discovery of Near-Earth Asteroids in the Zwicky Transient Facility
Deep Learning to Improve the Discovery of Near-Earth Asteroids in the Zwicky Transient Facility Open
We present a novel pipeline that uses a convolutional neural network (CNN) to improve the detection capability of near-Earth asteroids (NEAs) in the context of planetary defense. Our work aims to minimize the dependency on human interventi…
View article: Optical spectroscopy of comets using Hanle Echelle Spectrograph (HESP)
Optical spectroscopy of comets using Hanle Echelle Spectrograph (HESP) Open
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 have obtained medium and high-resolution (R (λ/Δλ) = 30 00…
View article: Long-term spectroscopic monitoring of comet 46P/Wirtanen
Long-term spectroscopic monitoring of comet 46P/Wirtanen Open
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 composition over multiple apparitions. Comet 46P/Wirtanen with its e…
View article: The Evolution of Activity and Chemical Composition in Rosetta’s Comet Targets across Multiple Apparitions: Complications for CS<sub>2</sub> as the CS Parent in Comet Nuclei
The Evolution of Activity and Chemical Composition in Rosetta’s Comet Targets across Multiple Apparitions: Complications for CS<sub>2</sub> as the CS Parent in Comet Nuclei Open
Jupiter-family comets are ephemeral small bodies injected into the inner solar system from the Kuiper Belt, doomed to either sublimate all their volatiles and become inert or violently shatter from the activity. We investigate two target c…
View article: Atomic Iron and Nickel in the Coma of C/1996 B2 (Hyakutake): Production Rates, Emission Mechanisms, and Possible Parents
Atomic Iron and Nickel in the Coma of C/1996 B2 (Hyakutake): Production Rates, Emission Mechanisms, and Possible Parents Open
Two papers recently reported the detection of gaseous nickel and iron in the comae of over 20 comets from observations collected over two decades, including interstellar comet 2I/Borisov. To evaluate the state of the laboratory data in sup…
View article: Variable X-Ray Emission of Comet 46P/Wirtanen
Variable X-Ray Emission of Comet 46P/Wirtanen Open
In this paper, we present an analysis of X-ray and optical/ultraviolet (UV) data from the favorable (Δ ∼ 0.077 au) 2018 apparition of comet 46P/Wirtanen. The comet was observed during three different epochs (before, during, and after perih…
View article: Characterizing the aftermath of a medium-sized outburst of Centaur 29P/Schwassmann-Wachmann 1 using HST/WFC3
Characterizing the aftermath of a medium-sized outburst of Centaur 29P/Schwassmann-Wachmann 1 using HST/WFC3 Open
Comet 29P/Schwassmann-Wachmann 1 (hereafter, 29P) is a highly active andprominent member of the Centaur population. Centaurs are icy bodies with orbits between Jupiter and Neptune, which dynamically link the Jupiter-family comets to the tr…
View article: Atomic iron and nickel in the coma of C/1996 B2 (Hyakutake): production\n rates, emission mechanisms, and possible parents
Atomic iron and nickel in the coma of C/1996 B2 (Hyakutake): production\n rates, emission mechanisms, and possible parents Open
Two papers recently reported the detection of gaseous nickel and iron in the\ncomae of over 20 comets from observations collected over two decades, including\ninterstellar comet 2I/Borisov. To evaluate the state of the laboratory data in\n…
View article: First Comet Observations with NIRSPEC-2 at Keck: Outgassing Sources of Parent Volatiles and Abundances Based on Alternative Taxonomic Compositional Baselines in 46P/Wirtanen
First Comet Observations with NIRSPEC-2 at Keck: Outgassing Sources of Parent Volatiles and Abundances Based on Alternative Taxonomic Compositional Baselines in 46P/Wirtanen Open
A major upgrade to the NIRSPEC instrument at the Keck II telescope was successfully completed in time for near-infrared spectroscopic observations of comet 46P/Wirtanen during its exceptionally close flyby of Earth in 2018 December. These …
View article: FUV Observations of the Inner Coma of 46P/Wirtanen
FUV Observations of the Inner Coma of 46P/Wirtanen Open
Far-ultraviolet observations of comets yield information about the energetic processes that dissociate the sublimated gases from their primitive surfaces. Understanding which emission processes are dominant, their effects on the observed c…
View article: Activity of the first interstellar comet 2I/Borisov around perihelion: results from Indian observatories
Activity of the first interstellar comet 2I/Borisov around perihelion: results from Indian observatories Open
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 at the Indian Astronomical Observatory, Hanle (HCT) and 1.2…
View article: Ionic emissions in comet C/2016 R2 (Pan-STARRS)
Ionic emissions in comet C/2016 R2 (Pan-STARRS) Open
We have carried out observations of a peculiar comet, C/2016 R2 (Pan-STARRS), using a low-resolution spectrograph mounted on the 1.2-m telescope at Mount Abu Infrared Observatory, India. The comet was observed on two dates in 2018 January,…
View article: Solar system studies with the Indo-Belgian telescopes
Solar system studies with the Indo-Belgian telescopes Open
Indian astronomers have been using their relatively modest instruments and telescopes to contribute greatly in understanding the minor bodies of the solar system. Here we discuss some of the results from observations using Indian facilitie…
View article: Solar system astronomy with the 3.6-m DOT and the 4-m ILMT
Solar system astronomy with the 3.6-m DOT and the 4-m ILMT Open
Solar system astronomy would be an important field of study with the 3.6-m Devasthal Optical Telescope (DOT) and the 4-m International Liquid Mirror Telescope (ILMT). In this contribution, we highlight the work that could be done in reachi…
View article: Optical spectroscopy of comet C/2014 Q2 (Lovejoy) from the Mount Abu Infrared Observatory
Optical spectroscopy of comet C/2014 Q2 (Lovejoy) from the Mount Abu Infrared Observatory Open
Spectra of comet C/2014 Q2 (Lovejoy) were taken with a low-resolution spectrograph mounted on the 0.5-m telescope at the Mount Abu Infrared Observatory (MIRO), India during 2015 January to May, covering the perihelion and post-perihelion p…