KFU. Card publication. High-precision Astrometric Observations of the SRG Space Observatory with RTT-150 for Orbit Correction Control

KAZAN
FEDERAL UNIVERSITY

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HIGH-PRECISION ASTROMETRIC OBSERVATIONS OF THE SRG SPACE OBSERVATORY WITH RTT-150 FOR ORBIT CORRECTION CONTROL

Form of presentation

Articles in international journals and collections

Year of publication

2023

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Authors, employees of KFU

Bikmaev Ilfan Fyaritovich, author

Bibliographic description in the original language

Khamitov I.M, Bikmaev I.F., High-precision Astrometric Observations of the SRG Space Observatory with RTT-150 for Orbit Correction Control//Astronomy Letters. - 2023. - Vol.49, Is.3. - P.141-150.

Annotation

The Russian–Turkish 1.5-m telescope (hereafter RTT-150) takes an active part in the work on the ground optical support of observations by the Russian Spectrum–Ro¨ ntgen–Gamma (SRG) observatory (with the participation of Germany) aimed at the identification and classification of new X-ray sources detected by the SRG telescopes. The instrumental capabilities of RTT-150 (occasionally, without any significant usage of telescope time and detriment for astrophysical programs) are used in astrometric observations to control the correction of the orbit of the SRG space observatory itself. In these cases, RTT- 150 provides the Ballistic Center of the Keldysh Institute of AppliedMathematics of the Russian Academy of Sciences with high-precision astrometric measurements of the SRG position, which have been used to successfully keep it in its operational orbit for more than three years of its exploitation. Beginning from the stage of flight to the zone of the Lagrange point L2 in July 2019 and at the main phase of the allsky survey mission until March 2023, 96 sets (with a duration of about 30 min each) of high-precision positional observations with more than 5000 astrometric and photometric measurements were carried out at the RTT-150 observing facility. In most cases, the positional accuracy of the measurements dependent on seeing and apparent SRG brightness agrees with the accuracy of the provided ephemerides, 0.10 and 0.15 in declination and right ascension, respectively. In the summer months in projection onto the central region of theGalaxy in fields extremely rich in sources, the astrometric accuracy is 1 , sufficient for the SRG detection after the corrections and subsequent refinements of its trajectory. Geographically, RTT-150 is the southernmost instrument among the Russian telescopes for the ground astrophysical support of SRG. This fact is also extremely important in positional SRG observations at the lowest positions in declination DEC ∼ −30◦. We present the results of our astrometric and photometric observations with RTT-150 and our astrometric data reduction technique in various fields up to those extremely rich in sources.

Keywords

optical observations, photometric and positional observations of space observatories, telescopes: RTT-150, space observatories: SRG.

The name of the journal

Astronomy Letters

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85165286953&doi=10.1134%2fS1063773723030039&partnerID=40&md5=566174fa4067ed590a2628803f7c4434

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=286459&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Bikmaev Ilfan Fyaritovich	ru_RU
dc.date.accessioned	2023-01-01T00:00:00Z	ru_RU
dc.date.available	2023-01-01T00:00:00Z	ru_RU
dc.date.issued	2023	ru_RU
dc.identifier.citation	Khamitov I.M, Bikmaev I.F., High-precision Astrometric Observations of the SRG Space Observatory with RTT-150 for Orbit Correction Control//Astronomy Letters. - 2023. - Vol.49, Is.3. - P.141-150.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=286459&p_lang=2	ru_RU
dc.description.abstract	Astronomy Letters	ru_RU
dc.description.abstract	The Russian–Turkish 1.5-m telescope (hereafter RTT-150) takes an active part in the work on the ground optical support of observations by the Russian Spectrum–Ro¨ ntgen–Gamma (SRG) observatory (with the participation of Germany) aimed at the identification and classification of new X-ray sources detected by the SRG telescopes. The instrumental capabilities of RTT-150 (occasionally, without any significant usage of telescope time and detriment for astrophysical programs) are used in astrometric observations to control the correction of the orbit of the SRG space observatory itself. In these cases, RTT- 150 provides the Ballistic Center of the Keldysh Institute of AppliedMathematics of the Russian Academy of Sciences with high-precision astrometric measurements of the SRG position, which have been used to successfully keep it in its operational orbit for more than three years of its exploitation. Beginning from the stage of flight to the zone of the Lagrange point L2 in July 2019 and at the main phase of the allsky survey mission until March 2023, 96 sets (with a duration of about 30 min each) of high-precision positional observations with more than 5000 astrometric and photometric measurements were carried out at the RTT-150 observing facility. In most cases, the positional accuracy of the measurements dependent on seeing and apparent SRG brightness agrees with the accuracy of the provided ephemerides, 0.10 and 0.15 in declination and right ascension, respectively. In the summer months in projection onto the central region of theGalaxy in fields extremely rich in sources, the astrometric accuracy is 1 , sufficient for the SRG detection after the corrections and subsequent refinements of its trajectory. Geographically, RTT-150 is the southernmost instrument among the Russian telescopes for the ground astrophysical support of SRG. This fact is also extremely important in positional SRG observations at the lowest positions in declination DEC ∼ −30◦. We present the results of our astrometric and photometric observations with RTT-150 and our astrometric data reduction technique in various fields up to those extremely rich in sources.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	optical observations	ru_RU
dc.subject	photometric and positional observations of space observatories	ru_RU
dc.subject	telescopes: RTT-150	ru_RU
dc.subject	space observatories: SRG.	ru_RU
dc.title	High-precision Astrometric Observations of the SRG Space Observatory with RTT-150 for Orbit Correction Control	ru_RU
dc.type	Articles in international journals and collections	ru_RU