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Browsing by Author "Parihar, P. S"

Browsing by Author "Parihar, P. S"

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  • A 10-m class national large optical-IR telescope 
    Anupama, G. C; Maheswar, G; Sriram, S; Sivarani, T; Parihar, P. S; Nagabhushana, S; Angchuk, D; Barway, Sudhanshu; Bhatt, B. C; Banyal, R. K; Basheer, Alikhan; Prasanna, Deshmukh; Divakar, D. K; Dorjai, T; Goswami, A; Govinda, K. V; Jorphail, S; Kamath, U. S; Kemkar, P. M. M; Mahay, T. T; Muneer, S; Muthumariappan, C; Shantikumar, N. S; Pandey, G; Reddy, B. E; Sahu, D. K; Sandeep, D. S; Ramya, S; Stalin, C. S; Subramanian, S; Tsewang, Stanzin; Subramaniam, A (Indian Academy of Science, 2022-06)
    An observatory class national large optical-IR telescope (NLOT), is proposed to be built and located in the country. The telescope consists of a 10–12 m segmented primary. In order to cater to a diversity of observational ...
  • The 50cm robotic telescope: control system upgrade and automation 
    Stanzin, Tsewang; Jorphail, S; Parihar, P. S; Angchuk, D; Dorjai, T; Gyalson, T; Mahey, T. T; Dorjay, Padma; Dorjay, Phuntsok; Phunchok, Tsewang; Pamber, Tashi; Stanzin, Urgain; Angdu, Skalzang (SPIE-The International Society for Optical Engineering, 2022-08)
    We describe the details into the design and development of a low-cost yet efficient telescope control system (TCS) and observatory control software (OCS) for the 50cm telescope at the Indian Astronomical Observatory. The ...
  • All sky scanning cloud monitor for NLOT site survey 
    Sharma, T. K; Parihar, P. S; Kemkar, P. M. M (IOP Publishing, 2015-05)
    Monitoring local sky for the cloud is one of important task before setting-up a new observatory. Here we present the design, implementation and initial results of a scanning type cloud monitor developed in Indian Institute ...
  • ARCO: a program for Automatic Reduction of CCD Observations 
    Distefano, E; Messina, S; Cutispoto, G; Parihar, P. S; Comparato, M; Busá, I; Lanza, A. F; Lanzafame, A. C; Pagano, I; Strassmeier, K. G (EDP Sciences, 2007)
    The huge amount of CCD photometric data collected by robotic telescopes (as for instance the ICE-T telescope to be installed at Dome-C) requires a fully automated approach to the reduction and analysis procedures. To this ...
  • Astronomical site survey report on dust measurement, wind profile, optical turbulence, and their correlation with seeing over IAO-Hanle 
    Shantikumar, S. N; Kathiravan, S; Parihar, P. S; Larson, E. J. L; Sharika Mohanan; Angchuk, D; Jorphel, Sonam; Rangarajan, K. E; Prabhu, K (Springer Netherlands, 2017-04)
    The present work discusses astronomical site survey reports on dust content, vertical distribution of atmospheric turbulence, precipitable water vapor (PWV), surface and upper-air data, and their effects on seeing over the ...
  • An automated extinction and sky brightness monitor for the Indian Astronomical Observatory, Hanle 
    Sharma, T. K; Parihar, P. S; Banyal, R. K; Ahmad Dar, Ajaz; Kemkar, P. M. M; Stanzin, U; Anupama, G. C (Oxford University Press on behalf of the Royal Astronomical Society, 2017-08)
    We have developed a simple and portable device that makes precise and automated measurements of night sky extinction. Our instrument uses a commercially available telephoto lens for light collection, which is retrofitted ...
  • Binary star detection in the open cluster King 1 field 
    Saleh, P. R; Hazarika, D; Dar, A. A; Parihar, P. S; Saikia, E (IOP Publishing, 2020-03)
    A rarely studied open cluster, King 1 is observed using the 1.3-m telescope equipped with a 2k × 4k CCD at Vainu Bappu Observatory, India. We analyze the photometric data obtained from CCD observations in both B and V ...
  • BVR photometry of a newly identified RS CVn binary star HD 61396 
    Barway, Sudhanshu; Pandey, S. K; Parihar, P. S (Elsevier, 2004-12)
    BVR photometry of a recently identified RS CVn binary star HD 61396, carried out during 2001, is presented. The new photometry reveal significant evolution in the shape and amplitude of light curve when compared with those ...
  • Characterization of sites for Indian large optical telescope project 
    Parihar, P. S; Sharma, T. K; Surendran, A; Kemkar, P. M. M; Dadul; Stanzin, U; Anupama, G. C (IOP Publishing, 2015-04)
    Growing Indian astronomical community require access to large observing facility preferably located within the country. Site surveys carried out in the post indicates that the best sites for optical-NIR astronomy can better ...
  • Design and development of a mirror support system for prototype segmented mirror telescope 
    Govinda, K. V; Parihar, P. S; Kemkar, P. M. M; Goudar, Abhishek; Sandeep, D. S; Muthahar, R. Mohammed; Sagayanathan, K; Dharmadhikari, Radhika; Divya, P. H (SPIE-The International Society for Optical Engineering, 2022-08)
    The segment support system of any segmented mirror telescope is considered to be one of the most critical subsystem. The segment support not only holds the mirror without altering its figure, but also features mechanism ...
  • Design, development, and validation of a segment support actuator for the prototype segmented mirror telescope 
    Deshmukh, P. G; Mandal, A; Parihar, P. S; Nayak, D; Mishra, Deepta Sundar (SPIE-The International Society for Optical Engineering, 2018-01)
    Segmented mirror telescopes (SMT) are built using several small hexagonal mirrors positioned and aligned by the three actuators and six edge sensors per segment to maintain the shape of the primary mirror. The actuators ...
  • Development of a Lunar Scintillometer as part of the national large optical telescope site survey 
    Surendran, A; Parihar, P. S; Banyal, R. K; Anusha Kalyaan (Springer, 2018-03)
    Ground layer turbulence is a very important site characterization parameter used to assess the quality of an astronomical site. The Lunar Scintillometer is a simple and effective site-testing device for measuring the ...
  • Dynamic Loading Assembly for Testing Actuators of Segmented Mirror Telescope 
    Prasanna Deshmukh; Parihar, P. S; Balasubramaniam, K. A; Mishra, Deepta Sundar; Mahesh, P. K (World Scientific Publishing Co., 2017-09)
    Upcoming large telescopes are based on Segmented Mirror Telescope (SMT) technology which uses small hexagonal mirror segments placed side by side to form the large monolithic surface. The segments alignment needs to be ...
  • Exploring pre-main sequence variables of ONC: the new variables 
    Parihar, P. S; Messina, S; Distefano, E; Shantikumar, N. S; Medhi, B. J (Wiley Blackwell, 2009-07)
    Since 2004, we have been engaged in a long-term observing program to monitor young stellar objects in the Orion Nebula Cluster. We have collected about two thousands frames in V, R, and I broad-band filters on more than ...
  • FR Cnc revisited: photometry, polarimetry and spectroscopy 
    Golovin, A; Galvez-Ortiz, M. C; Hernan-Obispo, M; Andreev, M; Barnes, J. R; Montes, D; Pavlenko, E; Pandey, J. C; Martinez-Arnaiz, R; Medhi, B. J; Parihar, P. S; Henden, A; Sergeev, A; Zaitsev, S. V; Karpov, N (Wiley-Blackwell, 2012-03)
    This paper is part of a multiwavelength study aimed at using complementary photometric, polarimetric and spectroscopic data to achieve an understanding of the activity process in late-type stars. Here, we present the ...
  • Impact of photometric variability on age and mass determination in young stellar objects: the case of the Orion Nebula Cluster 
    Messina, S; Parihar, P. S; Distefano, E (IOP Publishing, 2017-06)
    Very young stars, like the Orion Nebula Cluster (ONC) members analysed in the present study, exhibit photometric variability with a wide range of amplitudes. Such a prominent variability reflects in the inferred values of ...
  • An improved Technique to Explore Disk Accretion Process in PMS Stars 
    Parihar, P. S (Springer, 2010)
    The low mass PMS stars are found to be surrounded by thick, flared accretion disk and the disk material is supposed to be funneled onto the stellar surface by strong and predominately dipolar magnetic field. We have developed ...
  • Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in a young Sun-like star 
    Lanza, A. F; Pagano, I; Leto, G; Messina, S; Aigrain, S; Alonso, R; Auvergne, M; Baglin, A; Barge, P; Bonomo, A. S; Boumier, P; Collier Cameron, A; Comparato, M; Cutispoto, G; de Medeiros, J. R; Foing, B; Kaiser, A; Moutou, C; Parihar, P. S; Silva-Valio, A; Weiss, W. W (EDP Sciences, 2009-01)
    Context: The space experiment CoRoT has recently detected transits by a hot Jupiter across the disc of an active G7V star (CoRoT-Exo-2a) that can be considered as a good proxy for the Sun at an age of approximately 0.5 ...
  • Night sky at the Indian Astronomical Observatory during 2000-2008 
    Stalin, C. S; Hegde, M; Sahu, D. K; Parihar, P. S; Anupama, G. C; Bhatt, B. C; Prabhu, T. P (Astronomical Society of India, 2008-09)
    This paper presents an analysis of the optical night sky brightness and extinction coefficient measurements in UBVRI at the Indian Astronomical Observatory (IAO), Hanle, during the period 2000–2008. They are obtained from ...
  • Night Sky Extinction Measurements at the Indian Astronomical Observatory, Hanle 
    Parihar, P. S; Sahu, D. K; Bhatt, B. C; Subramaniam, A; Anupama, G. C; Prabhu, T. P (Astronomical Society of India, 2003)
    We present the estimates of the night sky extinction at the Indian Astronomical Observatory. Also presented are the estimates of the night sky brightness. The extinction in the U band at IAO is found to be lower than the ...

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