RadioAstron gravitational redshift experiment: status update

D.A. Litvinov, U. Bach, N. Bartel, K.G. Belousov, M. Bietenholz, A.V. Biriukov, G Cimo, D. A. Duev, L. I. Gurvits, A.V. Gusev, R Haas, V.L. Kauts, B.Z. Kanevsky, A.V. Kovalenko, G Kronschnabl, V.V. Kulagin, Maria Lindqvist, G Molera Calves, A. Neidhardt, C. PlotzS. V. Pogrebenko, N.K. Porayko, V.N. Rudenko, K. V. Sokolovsky, A.I. Smirnov, V.A. Stepanyants, J. Yang, M.V. Zakhvatkin

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A test of a cornerstone of general relativity, the gravitational redshift effect, is currently being conducted with the RadioAstron spacecraft, which is on a highly eccentric orbit around Earth. Using ground radio telescopes to record the spacecraft signal, synchronized to its ultra-stable on-board H-maser, we can probe the varying flow of time on board with unprecedented accuracy. The observations performed so far, currently being analyzed, have already allowed us to measure the effect with a relative accuracy of 4 × 10−4 . We expect to reach 2.5×10−5 with additional observations in 2016, an improvement of almost a magnitude over the 40-year old result of the GP-A mission.
Original languageEnglish
Title of host publicationProceedings of the Fourteenth Marcel Grossman Meeting on General Relativity
EditorsM. Bianchi, R.T. Jantzen, R. Ruffini
Number of pages5
Publication statusPublished - 20 Mar 2016
Event14th Marcel Grossmann Meeting - Rome, Italy
Duration: 12 Jul 201518 Jul 2015
Conference number: 14


Conference14th Marcel Grossmann Meeting
Abbreviated titleMG14
Internet address


  • galaxies: active
  • galaxies: jets
  • quasars: individual (3C273)
  • radio continuum: galaxies
  • techniques: interferometric

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