[*] Draft version June 5, 2024 Typeset using L A T E X default style in AASTeX631 Enhancing Exoplanet Ephemerides by Leveraging Professional and Citizen Science Data: A Test Case with WASP-77A b Federico R. Noguer , 1 Suber Corley, 1 Kyle A. Pearson , 2 Robert T. Zellem , 2 Molly N. Simon , 1 Jennifer A. Burt , 2 Isabela Huckabee, 1, 2 Prune C. August , 3 Megan Weiner Mansfield , 4, 5 Paul A. Dalba , 6, 7 Peter C. B. Smith , 8 Timothy Banks , 9, 10, 11 Ira Bell, 1, 9 Dominique Daniel, 12 Lindsay Dawson, 13, 9 Jes´ us De Mula, 9 Marc Deldem, 12 Dimitrios Deligeorgopoulos, 12 Romina P. Di Sisto, 14, 15 Roger Dymock, 16 Phil Evans , 17 Giulio Follero, 18 Martin J. F. Fowler , 19 Eduardo Fern´ andez-Laj´ us, 15 Alex Hamrick, 20 Nicoletta Iannascoli, 18 Andre O. Kovacs, 21, 9 Denis Henrique Kulh, 22 Claudio Lopresti, 12, 23, 24 Antonio Marino, 18 Bryan E. Martin, 25, 21 Paolo Arcangelo Matassa, 12 Tasso Augusto Napole˜ ao, 22 Alessandro Nastasi, 26, 27 Anthony Norris, 9 Alessandro Odasso, 12 Nikolaos I. Paschalis, 28, 12 Pavel Pintr, 29, 12 Jake Postiglione, 9 Justus Randolph, 9 Franc¸ois Regembal, 12 Lionel Rousselot, 12 Sergio Jos´ e Gonc¸alves da Silva, 22 Andrew Smith, 9 and Andrea Tomacelli 18 1 School of Earth and Space Exploration, Arizona State University, 781 E Terrace Mall, Tempe, AZ 85287-6004, United States 2 Jet Propulsion Laboratory California Institute of Technology. 4800 Oak Grove Drive, Pasadena, CA 91109, USA 3 DTU Space, Technical University of Denmark, Elektrovej 328, DK-2800 Kgs. Lyngby, Denmark 4 Steward Observatory, University of Arizona, Tucson, AZ 85719, USA 5 NHFP Sagan Fellow 6 Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA 7 SETI Institute, Carl Sagan Center, 339 Bernardo Ave, Suite 200, Mountain View, CA 94043, USA 8 School of Earth & Space Exploration, Arizona State University, Tempe AZ 85287, USA 9 Exoplanet Watch Citizen Scientist Contributor, https://exoplanets.nasa.gov/exoplanet-watch 10 Dept. of Physical Sci. & Engineering, Harper College, 1200 W Algonquin Rd, Palatine, IL 60067, USA 11 Nielsen, 675 6th Ave, New York 10011, USA 12 ExoClock Project Citizen Scientist Contributor, https://www.exoclock.space 13 Thomas More University, 333 Thomas More Parkway, Crestview Hills, Kentucky 14 Facultad de Ciencias Astron´ omicas y Geof´ısicas Universidad Nacional de La Plata, Argentina 15 Instituto de Astrof´ısica de La Plata, Observatorio Astron´ omico de La Plata: Paseo del Bosque, B1900FWA, La Plata, Argentina 16 British Astronomical Association 17 El Sauce Observatory, Coquimbo Province, Chile 18 Unione Astrofili Napoletani, c/o INAF-Osservatorio Astronomico di Capodimonte Napoli via Moiariello, 16 80131 Napoli 19 Les Rocquettes Observatory and Exoplanet Factory, South Wonston, Hampshire, SO21 3EX, United Kingdom 20 Stanford Online High School, 415 Broadway Academy Hall, Floor 2, 8853, Redwood City, CA 94063 21 AAVSO, 185 Alewife Brook Parkway, Suite 410, Cambridge, MA 02138, USA 22 Alfa Crucis 23 Gruppo Astronomia Digitale (GAD, Italy) 24 Sezione Pianeti Extrasolari (UAI, Italy) 25 Tiger Butte Observatory, 2013 Whispering Ridge Dr, Great Falls, MT 59405. 26 GAL Hassin - Centro Internazionale per le Scienze Astronomiche, Via della Fontana Mitri 3, 90010 Isnello, Palermo, Italy 27 INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento, 1, 90134 Palermo, Italy 28 Nunki Observatory, Skiathos Island, Greece 29 Institute of Plasma Physics ASCR, v. v. i. Centre TOPTEC, Sobotecka 1660 511 01 Turnov Czech Republic 1. ABSTRACT We present an updated ephemeris, and physical parameters, for the exoplanet WASP-77 A b. In this effort, we combine 64 ground- and space-based transit observations, 6 space-based eclipse observations, arXiv:2405.19615v2 [astro-ph.EP] 4 Jun 2024