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Browsing by Author "Chakraborty, P"

Browsing by Author "Chakraborty, P"

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  • CCD observations of mutual events of Jovian satellites from VBO during 1997 
    Vasundhara, R; Chakraborty, P; Appakutty, M; Dinakaran, N; Ganeshan, M; Kuppuswamy, K; Moorthy, V; Muniyandi, A; Selvakumar, G; Velu, C; Ramana, K. V (Astronomical Society of India, 2001)
    CCD observations of the mutual events of the Galilean satellites of Jupiter from the Vainu Bappu Observatory during 1997 are presented. The derived times of close approach of the geometric centers of the satellites (satellite ...
  • 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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