Analysis of Orbital Configurations for Millimetron Space Observatory

Rudnitskiy, A. G.; Mzhelskiy, P. V.; Shchurov, M. A.; Syachina, T. A.; Zapevalin, P. R.

doi:10.48550/arxiv.2108.03083

Cited by 1 publication

(3 citation statements)

References 36 publications

(44 reference statements)

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“…Such orbital regions make it possible to perform VLBI imaging with an adequate ( u , v) co v erage once a year for each of the selected sources, while the duration of such small baseline projection region in time is several days. Thus, according to Rudnitskiy et al ( 2021 ), we demonstrate that the orbit in the vicinity of L2 point of the Sun-Earth, despite the large distance from the Earth (1.5 million km), allows one to obtain small baseline projections of several Earth with, at the same time, relatively good ( u , v) co v erage for imaging with a resolution that will in any case be better than with ground-based telescopes only . Undoubtedly , the L2 point orbit also makes it possible to obtain extended spaceground baselines, even up more than 100 Earth diameters.…”

Section: O R B I T C O N F I G U R At I O Nmentioning

confidence: 55%

“…The choice of such an exit from the ecliptic plane increases daily radio visibility of the spacecraft at the Russian tracking stations for regular communication and control sessions with the spacecraft. More details on the orbital configuration can be found in Rudnitskiy et al ( 2021 ).…”

Section: O R B I T C O N F I G U R At I O Nmentioning

confidence: 99%

“…In our simulations, we used one of the orbits from the family of orbits located around L2 point of the Sun-Earth system from Rudnitskiy et al ( 2021 ), that is capable of imaging observations of M87 * and Sgr A * sources. We performed the corresponding simulations of S-E VLBI observations using several source models.…”

Section: R E S U Lt Smentioning

confidence: 99%

See 2 more Smart Citations

High-resolution imaging of a black hole shadow with Millimetron orbit around lagrange point l2

Лихачев

Rudnitskiy

Щуров

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Imaging of the shadow around supermassive black hole (SMBH) horizon with a very long baseline interferometry (VLBI) is recognized recently as a powerful tool for experimental testing of Einstein’s General relativity. The Event Horizon Telescope (EHT) has demonstrated that an Earth-extended VLBI with the maximum long base (D = 10, 700 km) can provide a sufficient angular resolution θ ∼ 20 μas at λ = 1.3 mm (ν = 230 GHz) for imaging the shadow around SMBH located in the galaxy M87*. However, the accuracy of critically important characteristics, such as the asymmetry of the crescent-shaped bright structure around the shadow and the sharpness of a transition zone between the shadow floor and the bright crescent silhouette, both of order Δθ ∼ 4 μas, is still to be improved. In our previous paper we have shown that Space-Earth VLBI observation within a joint Millimetron and EHT configuration at the near-Earth high elliptical orbit (HEO) can considerably improve the image quality. Even more solid grounds for firm experimental validation of General relativity can be obtained with a higher resolution available within the joint Millimetron and EHT program at the Lagrangian point L2 in the Sun-Earth system with an expected imaging resolution at 230 GHz of Δθ ∼ 5 μas. In this paper we argue that in spite of limitations of L2 orbit, an adequate sparse (u, v) coverage can be achieved and the imaging of the shadows around Sgr A* and M87* can be performed with a reasonable quality.

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Section: O R B I T C O N F I G U R At I O Nmentioning

confidence: 55%

Section: O R B I T C O N F I G U R At I O Nmentioning

confidence: 99%