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Browsing by Author "Chakraborty, P"

Browsing by Author "Chakraborty, P"

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  • Exposure time calculator for IFOSC and sky background estimation 
    Chakraborty, P; Das, H. K; Tandon, S. N (Astronomical Society of India, 2005-12)
    Abstract. This paper describes a spectroscopy exposure time calculator for the faint object spectrograph, the \IUCAA Faint Object Spectrograph" (IFOSC). It is intended to provide reasonable estimates of exposure times for ...
  • Investigations of Dust from Selected Comets 
    Chakraborty, P (Indian Institute of Astrophysics, Bangalore, 2001-02)
  • Investigations of Dust from Selected Comets 
    Chakraborty, P (Indian Institute of Astrophysics, Bangalore, 2001-02)
  • Investigations of the Morphology of Dust Shells of Comet C/2001 Q4 (NEAT) 
    Vasundhara, R; Chakraborty, P; Muneer, S; Masi, G; Rondi, S (The American Astronomical Society, 2007-02)
    The morphology of the dust fans and shells in the images of comet C/2001 Q4 (NEAT) showed significant changes between 2004 April and June due to rapid changes in the Earth viewing and solar illumination geometry. We model ...
  • Investigations of the Rotation Pole from the Morphology of Dust Fans of Comet 81P/Wild 2 
    Vasundhara, R; Chakraborty, P (The American Astronomical Society, 2004-12)
    Investigations of the dust morphology of comet 81P/Wild 2 in the I- and R-band images obtained on 1997 May 15 from the Vainu Bappu Observatory, Kavalur, India, are presented. We model the trajectories of dust grains ejected ...
  • A model of the stellar radiation field in the UV 
    Sujatha, N. V; Chakraborty, P; Murthy, J; Henry, R. C (Astronomical Society of India, 2004-09)
    This work is the first step in a systematic effort to understand and predict the different components of the UV (912 A - 3000 A) radiation field over the entire sky. We have developed a model to predict the ISRF in the UV ...
  • Modeling Dust Jets And Shells From Comet Hale-Bopp 
    Vasundhara, R; Chakraborty, P; Hänel, A; Heiser, E (Kluwer Academic Publishers, 1997-07)
    Persistent jet and shell structures from comet Hale-Bopp showing gradual changes in the shapes and orientations with aspect angle and solar illumination geometry indicate long lived active sources. A model to simulate the ...
  • Modeling of Jets from Comet Hale-Bopp (C/1995 O1): Observations from the Vainu Bappu Observatory 
    Vasundhara, R; Chakraborty, P (Academic Press, 1999-07)
    Jet and shell structures from Comet Hale-Bopp during the period October 1996 to October 1997 using data from the Vainu Bappu Observatory are modeled. Evolution of jet and shell structures during the period of observations ...
  • Observations of comet Shoemaker-Levy 9 from Japal-Rangapur Observatory 
    Vasundhara, R; Chakraborty, P; Rajamohan, R; Bhattacharyya, J. C; Som Sunder, G; Vivekananda Rao, P; Swaminathan, R; Lokanandham, B (Indian Academy of Sciences, 1995-02)
  • An Optical, Dual-Beam, Automated Medium Resolution Spectropolarimeter for the Vainu Bappu Telescope 
    Chakraborty, P; Vasundhara, R (Springer, 2003-03)
    Fabrication of an optical dual-beam spectropolarimeter as an add-on facility to an existing astronomical spectrograph at the Vainu Bappu Telescope is described. The polarimetric optics consists of a superachromatic ...
  • Photometry of Solar Corona to Study the Coronal Structures 
    Chakraborty, P; Sankarasubramanian, K; Majumder, S; Rajesh Nayak, K; Sridharan, R; Jana, A. D; Rajalakshmi, G; Suresh, D; Asgekar, A; Geetha, K. P; Rajesh, C. K (Indian Institute of Astrophysics, Bangalore, 1997)
    White light images of the solar corona were taken on KODAK 2415 films using 3-inch (f/11.5) telescopes fitted with SLR cameras. Observations were made from 4 different sites spread over the totality belt by four different ...
  • Proposed visible emission line space solar coronagraph 
    Singh, J; Prasad, B. R; Venkatakrishnan, P; Sankarasubramanian, K; Banerjee, D; Bayanna, R; Mathew, S; Murthy, J; Subramaniam, P; Ramesh, R; Kathiravan, S; Nagabhushana, S; Mahesh, P. K; Manoharan, P. K; Uddin, W; Sriram, S; Amit Kumar; Srivastava, N; Koteswara Rao; Nagendra, C. L; Chakraborty, P; Sriram, K. V; Venkateswaran, R; Krishnamurthy, T; Sreekumar, P; Sarma, K. S; Murthy, R; Navalgund, K. H; Samudraiah, D. R. M; Narayan Babu, P; Patra, A (Indian Academy of Sciences, 2011-01-25)
    The outer atmosphere of the sun – called the corona – has been observed during total solar eclipse for short periods (typically < 6 min), from as early as the eighteenth century. In the recent past, space-based instruments ...
  • Spectropolarimeter for the Vainu Bappu Telescope 
    Chakraborty, P (Vatican Observatory Foundation, 1999)
    Fabrication of an optical spectropolarimeter for the Vainu Bappu Telescope, consisting of a Pancharatnam half-wave plate and a modified Glan-Talyor polarizing beam splitter fitted as an add-on facility to an existing ...

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