Sciences and Exploration Directorate

Leonid Petrov

(Rsch AST, Solid Earth Geophysical Std)

Leonid Petrov's Contact Card & Information.
Phone: 301.614.5611
Org Code: 61A
Mail Code 61A
Greenbelt, MD 20771

Missions & Projects

Brief Bio

Leonid Petrov has over 30 years of experience in space geodesy, astrometry, and radioastronomy. He has been developing algorithms for all stages of analysis of very long baseline interferometry and their implementation in software and the operational pipeline with the goal to reach the highest level of accuracy and provide reliable estimates of uncertainties. He has led a number of projects that resulted in the most complete catalogue of compact radio sources. He has been working on incorporation of the output of numerical weather models into analysis of space geodesy and astronomy observations.




2024. "Radioastrometry at different frequencies." (2404.08800): [10.48550/arXiv.2404.08800] [Journal Article/Letter]

2023. "VGOS VLBI Intensives between MACGO12M and WETTZ13S for the rapid determination of UT1-UTC." International Association of Geodesy Symposia [10.1007/1345_2023_222] [Proceedings]

2023. "RadioAstron discovers a mini-cocoon around the restarted parsec-scale jet in 3C 84." Astronomy & Astrophysics 676 A114 [10.1051/0004-6361/202142594] [Journal Article/Letter]

2023. "First observations with a GNSS antenna to radio telescope interferometer." Radio Science 58 e2023RS007734 [10.1029/2023RS007734] [Journal Article/Letter]

2023. "Single band VLBI absolute astrometry." The Astronomical Journal 165 (4): 183 [10.3847/1538-3881/acc174] [Journal Article/Letter]

2023. "Precise VLBI/GNSS ties with micro-VLBI." The International Association for Geodesy Symposia on Reference Frames for Applications in Geosciences arXiv:2302.05555 [10.48550/arXiv.2302.05555] [Proceedings]

2022. "The Event Horizon Explorer mission concept." Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave 12180 121800M [10.1117/12.2630313] [Proceedings]

2022. "Seasonal glacierand snow loading at Svalbard recovered from geodetic observations." Geophysical Journal International 229 (1): 408-425 [10.1093/gji/ggab482] [Journal Article/Letter]

2021. "Powerful quasars with young jets in multi‐epoch radio surveys." Astronomische Nachrichten 342 (9-10): 1146-1150 [10.1002/asna.20210058] [Journal Article/Letter]

2021. "The use of astronomy VLBA campaign MOJAVE for geodesy." Journal of Geodesy 95 101 [10.1007/s00190-021-01551-3] [Journal Article/Letter]

2021. "The problematic Ψ1 ocean tide." Geophysical Journal International 227 (2): 1181-1192 [10.1093/gji/ggab263] [Journal Article/Letter]

2021. "Radio Counterpart Candidates to 4FGL-DR2 Unassociated Sources." The Astrophysical Journal 914 (1): 42 [10.3847/1538-4357/abf73b] [Journal Article/Letter]

2021. "A ring accelerator? Unusual jet dynamics in the IceCube candidate PKS 1502+106 ." Monthly Notices of the Royal Astrtonomical Society 503 (3): 3145-3178 [10.1093/mnras/stab589] [Journal Article/Letter]

2021. "Parsec-scale Properties of Steep- and Flat-spectrum Extragalactic Radio Sources from a VLBA Survey of a Complete North Polar Cap Sample." The Astronomical Journal 161 (2): 88 [Full Text] [10.3847/1538-3881/abd18c] [Journal Article/Letter]

2021. "The wide-field VLBA calibrator survey -- WFCS." The Astronomical Journal 161 (1): 14 [Full Text] [10.3847/1538-3881/abc4e1] [Journal Article/Letter]

2020. "Quasars That Have Transitioned from Radio-quiet to Radio-loud on Decadal Timescales Revealed by VLASS and FIRST." The Astrophysical Journal 905 (1): 74 [10.3847/1538-4357/abc341] [Journal Article/Letter]

2020. "Influence of the Galactic gravitational field on the positional accuracy of extragalactic sources. II Observational appearances and detectability." Astrophyisical Journal 898 (1): [10.3847/1538-4357/ab989b] [Journal Article/Letter]

2020. "The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope." The Astrophysical Journal 892 (2): 105 [10.3847/1538-4357/ab791e] [Journal Article/Letter]

2020. "Fermi Large Area Telescope Fourth Source Catalog." The Astrophysical Journal Supplement Series 247 (1): 33 [10.3847/1538-4365/ab6bcb] [Journal Article/Letter]

2019. "Microarcsecond VLBI pulsar astrometry with PSRpi II. parallax distances for 57 pulsars." The Astronomical Journral 875 (2): 100 [10.3847/1538-4357/ab11c7] [Journal Article/Letter]

2019. "Dissecting the AGN disk-jet system with joint VLBI-Gaia analysis." The Astrophysical Journal 871 (2): 143 [10.3847/1538-4357/aaf650] [Journal Article/Letter]

2019. "The Second LBA Calibrator Survey of southern compact extragalactic radio sources - LCS2." Monthly Notices of the Royal Astronomical Society 485 (1): 88-101 [10.1093/mnras/stz242] [Journal Article/Letter]

2019. "A quantitative analysis of systematic differences in positions and proper motions of Gaia DR2 with respect to VLBI." Monthly Notices of the Royal Astronomical Society 482 (3): 3023–3031 [10.1093/mnras/sty2807] [Journal Article/Letter]

2018. "Radio Interferometric Observation of an Asteroid Occultation." The Astronomical Journal 156 (4): 155 [10.3847/1538-3881/aad45b] [Journal Article/Letter]

2018. "A wide and collimated radio jet in 3C84 on the scale of a few hundred gravitational radii." Nature Astronomy 2 (6): 472-477 [10.1038/s41550-018-0431-2] [Journal Article/Letter]

2017. "Observational consequences of optical band milliarcsec-scale structure in active galactic nuclei discovered by Gaia." Monthly Notices of the Royal Astronomical Society 471 (4): 3775-3787 [10.1093/mnras/stx1747] [Journal Article/Letter]

2017. "VLBI Ecliptic Plane Survey: VEPS-1." The Astrophysical Journal Supplement Series 230 (2): 13 [10.3847/1538-4365/aa71a3] [Journal Article/Letter]

2017. "On significance of VLBI/Gaia position offsets." Monthly Notices of the Royal Astronomical Society: Letters 467 (1): L71-L75 [10.1093/mnrasl/slx001] [Journal Article/Letter]

2017. "Radio Follow-up on All Unassociated Gamma-Ray Sources from the Third Fermi Large Area Telescope Source Catalog." The Astrophysical Journal 838 (2): 139 [10.3847/1538-4357/aa6439] [Journal Article/Letter]

2017. "VLBI-Gaia offsets favor parsec-scale jet direction in active galactic nuclei." Astronomy & Astrophysics 598 L1 [10.1051/0004-6361/201630031] [Journal Article/Letter]

2017. "a Nearly Naked Supermassive Black Hole." The Astrophysical Journal 834 (2): 184 [10.3847/1538-4357/834/2/184] [Journal Article/Letter]

2016. "Microarcsecond VLBI pulsar astrometry with PSRPI. I. Two binary millisecond pulsars with white dwarf companions." The Astrophysical Journal 828 (1): 8 [10.3847/0004-637x/828/1/8] [Journal Article/Letter]

2016. "ASTEROID SIZING BY RADIOGALAXY OCCULTATION AT 5 GHZ." The Astrophysical Journal 822 (2): L21 [10.3847/2041-8205/822/2/l21] [Journal Article/Letter]

2016. "RADIOASTRON OBSERVATIONS OF THE QUASAR 3C273: A CHALLENGE TO THE BRIGHTNESS TEMPERATURE LIMIT." The Astrophysical Journal 820 (1): L9 [10.3847/2041-8205/820/1/l9] [Journal Article/Letter]

2015. "First Scientific VLBI Observations Using New Zealand 30 Meter Radio Telescope WARK30M." pasp 127 516 [10.1086/681965] [Journal Article/Letter]

2015. "1FGL J1417.7–4407: A LIKELY GAMMA-RAY BRIGHT BINARY WITH A MASSIVE NEUTRON STAR AND A GIANT SECONDARY." The Astrophysical Journal 804 (1): L12 [10.1088/2041-8205/804/1/l12] [Journal Article/Letter]

2015. "NEW ASSOCIATIONS OF GAMMA-RAY SOURCES FROM THE FERMI SECOND SOURCE CATALOG." The Astrophysical Journal Supplement Series 217 (1): 4 [10.1088/0067-0049/217/1/4] [Journal Article/Letter]

2014. "EARLY SCIENCE WITH THE KOREAN VLBI NETWORK: EVALUATION OF SYSTEM PERFORMANCE." The Astronomical Journal 147 (4): 77 [10.1088/0004-6256/147/4/77] [Journal Article/Letter]

2013. "THE CATALOG OF POSITIONS OF OPTICALLY BRIGHT EXTRAGALACTIC RADIO SOURCES OBRS-2." The Astronomical Journal 146 (1): 5 [10.1088/0004-6256/146/1/5] [Journal Article/Letter]

2013. "Australia Telescope Compact Array observations of Fermi unassociated sources." Monthly Notices of the Royal Astronomical Society 432 (2): 1294-1302 [10.1093/mnras/stt550] [Journal Article/Letter]

2012. "EARLY SCIENCE WITH THE KOREAN VLBI NETWORK: THE QCAL-1 43 GHz CALIBRATOR SURVEY." The Astronomical Journal 144 (5): 150 [10.1088/0004-6256/144/5/150] [Journal Article/Letter]

2012. "VLBI FORGRAVITY PROBE B. III. A LIMIT ON THE PROPER MOTION OF THE “CORE” OF THE QUASAR 3C 454.3." The Astrophysical Journal Supplement Series 201 (1): 3 [10.1088/0067-0049/201/1/3] [Journal Article/Letter]

2012. "THE KCAL VERA 22 GHz CALIBRATOR SURVEY." The Astronomical Journal 143 (2): 35 [10.1088/0004-6256/143/2/35] [Journal Article/Letter]

2011. "The EVN Galactic Plane Survey - EGaPS." Monthly Notices of the Royal Astronomical Society 419 (2): 1097-1106 [10.1111/j.1365-2966.2011.19765.x] [Journal Article/Letter]

2011. "THE CATALOG OF POSITIONS OF OPTICALLY BRIGHT EXTRAGALACTIC RADIO SOURCES OBRS-1." The Astronomical Journal 142 (4): 105 [10.1088/0004-6256/142/4/105] [Journal Article/Letter]

2011. "PRECISE ABSOLUTE ASTROMETRY FROM THE VLBA IMAGING AND POLARIMETRY SURVEY AT 5 GHz." The Astronomical Journal 142 (3): 89 [10.1088/0004-6256/142/3/89] [Journal Article/Letter]

2011. "THE VERY LONG BASELINE ARRAY GALACTIC PLANE SURVEY—VGaPS." The Astronomical Journal 142 (2): 35 [10.1088/0004-6256/142/2/35] [Journal Article/Letter]

2011. "The LBA Calibrator Survey of southern compact extragalactic radio sources - LCS1." Monthly Notices of the Royal Astronomical Society 414 (3): 2528-2539 [10.1111/j.1365-2966.2011.18570.x] [Journal Article/Letter]

2011. "First Geodetic Observations Using New VLBI Stations ASKAP-29 and WARK12M." Publications of the Astronomical Society of Australia 28 (02): 107-116 [10.1071/as10048] [Journal Article/Letter]

2010. "Height bias and scale effect induced by antenna gravitational deformations in geodetic VLBI data analysis." Journal of Geodesy 85 (1): 1-8 [10.1007/s00190-010-0410-6] [Journal Article/Letter]

2009. "Precise geodesy with the Very Long Baseline Array." Journal of Geodesy 83 (9): 859-876 [10.1007/s00190-009-0304-7] [Journal Article/Letter]

2009. "Use of the Long Baseline Array in Australia for Precise Geodesy and Absolute Astrometry." Publications of the Astronomical Society of Australia 26 (01): 75-84 [10.1071/as08030] [Journal Article/Letter]

2008. "THE SIXTH VLBA CALIBRATOR SURVEY: VCS6." The Astronomical Journal 136 (2): 580-585 [10.1088/0004-6256/136/2/580] [Journal Article/Letter]

2007. "VERA 22 GHz Fringe Search Survey." The Astronomical Journal 133 (6): 2487-2494 [10.1086/513146] [Journal Article/Letter]

2007. "The Fifth VLBA Calibrator Survey: VCS5." The Astronomical Journal 133 (4): 1236-1242 [10.1086/511157] [Journal Article/Letter]

2007. "The empirical Earth rotation model from VLBI observations." Astronomy & Astrophysics 467 (1): 359-369 [10.1051/0004-6361:20065091] [Journal Article/Letter]

2006. "The Fourth VLBA Calibrator Survey: VCS4." The Astronomical Journal 131 (3): 1872-1879 [10.1086/499947] [Journal Article/Letter]

2005. "The Third VLBA Calibrator Survey: VCS3." The Astronomical Journal 129 (2): 1163-1170 [10.1086/426920] [Journal Article/Letter]

2004. "Study of the atmospheric pressure loading signal in very long baseline interferometry observations." Journal of Geophysical Research 109 (B3): B03405 [10.1029/2003jb002500] [Journal Article/Letter]

2003. "The Second VLBA Calibrator Survey: VCS2." The Astrophysical Journal 126 (5): 2562-2566 [10.1086/378712] [Journal Article/Letter]

2003. "Study of harmonic site position variations determined by very long baseline interferometry." J. Geophys. Res. 108 (B4): 2190 [10.1029/2002JB001801] [Journal Article/Letter]

2002. "The VLBA Calibrator Survey—VCS1." Astrophysical Journal, Supplement Series 141 (1): 13-21 [10.1086/339806] [Journal Article/Letter]

2001. "Measurements of horizontal motion of the station Simeiz using VLBI." Kinematika i Fizika Nebesnykh Tel 17 424-436 [Journal Article/Letter]

1998. "VLBI measurements of the crustal deformations induced by polar motion." Izvestiya Physics of the Solid Earth 34 228-230 [Journal Article/Letter]


2013. "Revision of the Atmospheric Delay Correction for ICESat-2 Laser Altimeter Ranges." NASA/TM–2013- 217513 [Full Text] [Report]


1995 Ph.D. from Russan Academy of Sciences. Major: astronomy

1988 Master from Leningrad State University. Major: astronomy