Explanipedia

Polarimetric and spectropolarimetric observations with FoReRo2: Instrument overview and standard stars monitoring Open

G. Borisov, S. Bagnulo, R. Bogdanovski, T. Bonev · 2025

In this paper, we present a description and characterisation of the 2-Channel Focal Reducer Rozhen (FoReRo2), with an emphasis on its polarimetric and spectropolarimetric observation modes. FoReRo2 is a multimode instrument mounted at the …

Preliminary results of the long-term program on photometry and polarimetry of main-belt and near-Earth asteroids Open

Yu. N. Krugly, Daniel Hestroffer, Ziyu Liu, W. Thuillot, J. Desmars , et al. · 2025

Investigation of dynamical and physical properties of the main-belt and near-Earth asteroids is a priority research area, which has reached a new level in recent years. This progress has been facilitated by space missions to asteroids as w…

Polarimetry of M-type asteroids in the context of their surface composition Open

I. N. Belskaya, A. Berdyugin, Yu. N. Krugly, Z. Donchev, A. V. Sergeyev , et al. · 2022

Aims. We aim to investigate how polarimetric observations can improve our understanding of the nature and diversity of M/X-type asteroids. Methods. Polarimetric observations of the selected M/X-type asteroids were carried out at the Tohoku…

Rotation acceleration of asteroids (10115) 1992 SK, (1685) Toro, and\n (1620) Geographos due to the YORP effect Open

Josef Ďurech, David Vokrouhlický, Petr Pravec, Yu. N. Krugly, M.-J. Kim , et al. · 2021

The rotation state of small asteroids is affected by the\nYarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, which is a net torque\ncaused by solar radiation directly reflected and thermally reemitted from the\nsurface. Due to this effec…

Rotation acceleration of asteroids (10115) 1992 SK, (1685) Toro, and (1620) Geographos due to the YORP effect Open

Josef Ďurech, D. Vokrouhlický, Petr Pravec, Yu. N. Krugly, M. J. Kim , et al. · 2021

Context. The rotation state of small asteroids is affected by the Yarkovsky–O’Keefe–Radzievskii–Paddack (YORP) effect, which is a net torque caused by solar radiation directly reflected and thermally reemitted from the surface. Due to this…

H-alpha spectroscopy of the recurrent nova RS Oph during the 2021 outburst Open

R. Zamanov, K. A. Stoyanov, Y. Nikolov, T. Bonev, D. Marchev , et al. · 2021

We report spectroscopic observations of the H-alpha emission line of the recurrent nova RS Oph obtained between 12 and 23 August 2021 during the recent outburst. The data are Coude spectra in FITS format.

H-alpha spectroscopy of the recurrent nova RS Oph during the 2021 outburst Open

R. Zamanov, K. A. Stoyanov, Y. Nikolov, T. Bonev, D. Marchev , et al. · 2021

We report spectroscopic observations of the $Hα$ emission line of the recurrent nova RS~Oph obtained between 12 and 23 August 2021 during the recent outburst. On the basis of the sharp P~Cyg profile superimposed onto the strong H-alpha emi…

H-alpha spectroscopy of the recurrent nova RS Oph during the 2021 outburst Open

R. Zamanov, K. A. Stoyanov, Y. Nikolov, T. Bonev, D. Marchev , et al. · 2021

We report spectroscopic observations of the H-alpha emission line of the recurrent nova RS Oph obtained between 12 and 23 August 2021 during the recent outburst. The data are Coude spectra in FITS format.

Rotational variation of the linear polarization of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties Open

G. Borisov, Maxime Devogèle, A. Cellino, S. Bagnulo, A. A. Christou , et al. · 2018

Asteroid (3200) Phaethon is a Near-Earth Apollo asteroid with an unusual orbit that brings it closer to the Sun than any other known asteroid. Its last close approach to the Earth was in 2017 mid-December and the next one will be on 2026 O…

The phase-polarization curve of asteroid (3200) Phaethon† Open

Maxime Devogèle, A. Cellino, G. Borisov, Philippe Bendjoya, J-P Rivet , et al. · 2018

A multi-colour phase-polarization curve of asteroid (3200)~Phaethon has been\nobtained during the December 2017 apparition by merging measurements taken at\nthe observing station of Calern (France) and at the Rhozen observatory\n(Bulgaria)…

Implications of the small spin changes measured for large Jupiter-family comet nuclei Open

Rosita Kokotanekova, C. Snodgrass, Pedro Lacerda, Simon Green, Plamen Nikolov , et al. · 2018

Rotational spin-up due to outgassing of comet nuclei has been identified as a\npossible mechanism for considerable mass-loss and splitting. We report a search\nfor spin changes for three large Jupiter-family comets (JFCs): 14P/Wolf,\n143P/…

Transformation of Pan-STARRS1 gri to Stetson BVRI magnitudes. Photometry\n of small bodies observations Open

A. Kostov, T. Bonev · 2017

The UBVRI broad band photometric system is widely used in CCD astronomy.\nThere are a lot of sets of standard stars for this photometric system, the\nLandolt's and Stetson's catalogues being the most precise and reliable. Another\nphotomet…

Transformation of Pan-STARRS1 gri to Stetson BVRI magnitudes. Photometry of small bodies observations Open

A. Kostov, T. Bonev · 2017

The UBVRI broad band photometric system is widely used in CCD astronomy. There are a lot of sets of standard stars for this photometric system, the Landolt's and Stetson's catalogues being the most precise and reliable. Another photometric…

ESpeRo: Echelle Spectrograph Rozhen Open

T. Bonev, H. Markov, T. Tomov, R. Bogdanovski, Pencho Markishki , et al. · 2016

In this paper we describe the echelle spectrograph of the 2 meter telescope of the Rozhen National Astronomical Observatory. The spectrograph is a cross-dispersed, bench-mounted, fiber-fed instrument giving a resolution from $\sim$30000 to…

The 2-Meter Telescope of the National Astronomical Observatory Rozhen: Opportunities for GAIA-FUN-SSO Open

T. Bonev · 2016

HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or…

Imaging polarimetry and spectropolarimetry of comet C/2013 R1 (Lovejoy) Open

G. Borisov, S. Bagnulo, Plamen Nikolov, T. Bonev · 2016

We have obtained imaging polarimetry of the comet C/2013 R1 (Lovejoy) with 2-Channel-Focal-Reducer Rozhen instrument at 2m Ritchey-Chrétien-Coudé telescope of the Bulgarian National Astronomical Observatory Rozhen in two dust continuum fil…

Imaging polarimetry and spectropolarimetry of comet C/2013 R1 (Lovejoy) Open

G. Borisov, S. Bagnulo, Plamen Nikolov, T. Bonev · 2015

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