Photographic observations of visual double stars at Pulkovo: Digitization, measurement, and calibration

Izmailov, I. S.; Roshchina, E. A.; Kiselev, A. A.; Kiseleva, T. P.; Kalinichenko, O. A.; Bykov, O. P.; Kiyaeva, O. V.; Romanenko, L. G.; Shakht, N. A.; Maslennikov, K. L.; Vasil’eva, T. A.

doi:10.1134/s1063773715120051

Cited by 11 publications

(7 citation statements)

References 5 publications

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“…Observations were realized for proper motion surveys of selected sky areas and open clusters (Bobylev et al 2004), astrometric observations of the Solar System bodies (Kiseleva et al 2015), and photographic surveys used to construct astrometric catalogs (Khrutskaya et al 2004). One of the primary goals was to determine the orbital parameters and masses of binary stars, therefore the archive is half composed of the 26-inch refractor plates (Izmailov et al 2016). The Normal Astrograph plates are limited by 17 mag.…”

Section: Pulkovo Archivementioning

confidence: 99%

The NAROO digitization center

Robert

Desmars²,

Lainey³

et al. 2021

A&A

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The New Astrometric Reduction of Old Observations (NAROO) center can be found at the Paris Observatory in Meudon, and it is dedicated to the measurement of astrophotographic plates and the analysis of old observations. The NAROO digitizer consists of a granite-based Newport-Microcontrol open-frame air-bearing XY positioning table, a scientific sCMOS camera, and a telecentric optical system. The plate holder assembly is suited for mounting glass plates up to 350 mm squared. The machine positioning stability is better than 15 nm, and its repeatability is better than 40 nm. With real photographic plate data, we were able to produce measurements with an accuracy better than 65 nm. The renewed interest about photographic plates concerns the expansion of the database of transient objects evolving in time, since digitization now makes it possible to measure images with a high level of accuracy and to identify all the available objects. The information extracted from such materials can be of an astrometric, photometric, and spectroscopic nature, when not purely imaging, with consequences in planetology, near-Earth asteroid risk assessment, astrophysical phenomena, and general relativity, to mention but a few. Through our scientific program in the Gaia era, we detail examples of current and upcoming uses for the community. We invite researchers to use our facilities and digitize their collection by answering our call for proposals.

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Section: Pulkovo Archivementioning

confidence: 99%

The NAROO digitization center

Robert

Desmars²,

Lainey³

et al. 2021

A&A

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“…In the past few years, the MDD measuring complex has been actively used at the Pulkovo Observatory. (for detailed information see Izmailov et al 2016;Khovritchev et al 2021).…”

Section: Astronegative Remeasurementsmentioning

confidence: 99%

Does ADS 9346 have a low-mass companion?

Kiyaeva,

Khovritchev,

Kulikova

et al. 2021

Preprint

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Based on the photographic and the CCD observations of the relative motion of A, B components of the binary system ADS 9346 obtained with the 26-inch refractor of the Pulkovo Observatory during 1979-2019, we discover an invisible companion associated with the A-star. Comparison of the ephemerides with the positional and the spectroscopic observations allowed us to calculate the preliminary orbit of the photocenter (P = 15 years). The minimal mass of the companion is approximately 0.13 M . The existence of the invisible low-mass companion is implied by the IR-excess based on the IRAS data. To confirm this, additional observations of the radial velocity near the periastron need to be carried out.

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“…The collection today contains 50,000 plates (Kanaev et al 2002). The plates were measured using the "Ascorecord" machine with visual pointing, the "Fantasy" automatic complex (Gerasimov et al 1989), and the UMAX scanner (600 ppi) (Izmailov et al 2016). In 2010, the measurement and calibration technique for wide fields digitized by the scanner Microtec (3200 ppi) differential magnitude Schaefer (2016), by-eye measurements LSQ 0.325±0.040…”

Section: Light Curve With Pulkovo Datamentioning

confidence: 99%

“…For Boyajian's Star, we decided to use a digital camera for plate digitization. The plate digitization and calibration process is described in (Izmailov et al 2016) and used 9 nearby stars for calibration. The average standard deviation from the mean is 0.13 mag.…”

Section: Light Curve With Pulkovo Datamentioning

confidence: 99%

Sonneberg Plate Photometry for Boyajian's Star in Two Passbands

Hippke¹,

Kroll

Matthai

et al. 2017

ApJ

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The F3 main sequence star KIC 8462852 (Boyajian's Star) showed deep (up to 20%) day-long brightness dips of unknown cause during the 4 years of the Kepler mission. A 0.164 mag (16%) dimming between 1890 and 1990 was claimed, based on the analysis of photographic plates from the Harvard Observatory. We have gathered an independent set of historic plates from Sonneberg Observatory, Germany, covering the years 1934 -1995. With 861 magnitudes in B, and 397 magnitudes in V, we find the star to be of constant brightness within 0.03 mag per century (3%). Consistent outcomes are found using by-eye estimates of the best 119 plates. Results are supported by data from Sternberg Observatory, Moscow, which show the star as constant between 1895 and 1995. The previously claimed century-long dimming is inconsistent with our results at the 5σ-level, however the recently reported modest dimming of 3% in the Kepler data is not inconsistent with our data. We find no periodicities or shorter trends within our limits of 5% per 5-year bin, but note a possible dimming event on 24 Oct 1978.

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Photographic observations of visual double stars at Pulkovo: Digitization, measurement, and calibration

Cited by 11 publications

References 5 publications

The NAROO digitization center

The NAROO digitization center

Does ADS 9346 have a low-mass companion?

Sonneberg Plate Photometry for Boyajian's Star in Two Passbands

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