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    • ANWESH KUMAR MISHRA

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    • Volume 42 All articles Published: 22 April 2021 Article ID 0011

      A near-infrared photometer for the 1-m telescope of Vainu Bappu Observatory

      ANWESH KUMAR MISHRA U. S. KAMATH

      More Details Abstract Fulltext PDF

      A near-infrared photometer based on an InGaAs PIN photodiode and the filter set recommended by Infrared Working Group (IRWG) have been designed and built. It is mounted on the 1-m Carl–Zeiss telescope at the Vainu Bappu Observatory (VBO) in Kavalur, India. The main science goal is to observe bright sources (<5 magnitude) in the iZ, iJ and iH photometric bands. A discussion of the instrument and on-telescope performance during first-light tests are presented in this paper.

    • Volume 43 All articles Published: 26 February 2022 Article ID 0013

      Filters for NIR astronomical photometry: comparison of commercial IRWG filters and designs using OpenFilters

      ANWESH KUMAR MISHRA U. S. KAMATH

      More Details Abstract Fulltext PDF

      The photometric accuracy in the near-infrared (NIR) wavelength range (0.9–2.6 $\mu$m) is strongly affected by the variability of atmospheric transmission. The Infrared Working Group (IRWG) has recommendedfilters that help alleviate this issue and provide a common standard of NIR filtersets across different observatories. However, accurate implementation of these filters are yet to be available to astronomers. In the meantime, InGaAs based detectors have emerged as a viable option for small and medium telescopes. The present work explores the combination of IRWG filtersets with InGaAs detectors. A few commercially available filtersets that approximate the IRWG profile are compared. Design of more accurate IRWG filtersets suitable for the InGaAs sensitivity range is undertaken using an open-source filter design software – OpenFilters. Along with the photometric filters iZ, iJ and iH, design of a few useful narrow band filters is also presented. These filters present opportunities for small and medium telescopes for dedicated long-termobservation of interesting infrared sources.

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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