May 2013 Radio Science Occultation Experiment
May 21, 2013
This graphic illustrates the Radio Science Occultation Experiment conducted on Friday May 10, 2013. Details and description of terms: Dots are spaced at 15-minute (15 m) intervals along the central blue line representing Cassini's path behind Saturn, going from right to left, which is southwest to northeast in the sky. Terms and abbreviations: 2 / 3 Way: Signal received on Earth based on uplink from Earth. 2-Way means same DSN station uplinking & receiving; 3-Way means a different station receiving. 1-W: One way downlink communications, spacecraft not receiving an uplink reference frequency 2-W: Two-way (see above) 3-W: Three-way (see above) 69.5° S: Southern Saturn Latitude Greek letter B (beta): Angle of ring-plane slant as viewed from Earth Red letter A: Saturn's A ring Red Letters CD: Cassini Division in Saturn's rings Red Letter B: Saturn's B ring Red Letter F: Saturn's F ring Acquisition: Receiving the signal from Cassini in the DSN antennas and receivers Blind pointing: A technique for pointing DSN antenna based on predictions ERT: Earth-Receive Time Exp: Experiment (Radio Science Occultation Experiment) D/L: Downlink; signal from spacecraft to Earth DOY: Day of Year DSN: Deep Space Network DSS: Deep Space Station (DSN Station) DSS-14: A 70-meter diameter DSN station at Goldstone, California DSS-34: A 34-meter diameter DSN station at Canberra, Australia DSS-45: A 34-meter diameter DSN station at Canberra, Australia HGA: Cassini's High-Gain Antenna Monopulse pointing: A closed-loop technique for refinement of DSN antenna pointing based on received signal Rev 190: Cassini's Saturn orbit #190 RSS: Cassini Radio Science Subsystem RTLT: Round-Trip LIght-Time of the radio signals S/C: Spacecraft TBD: To be determined (was determined) in real time U/L: Uplink; signal from Earth to spacecraft UTC: Universal Time Coordinated The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate in Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo. For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov or http://www.nasa.gov/cassini . Image courtesy of Cassini Radio Science Subsystem team. Credit: Essam A. Marouf (EAM).
Topics: Cassini–Huygens, Deep Space Network, Spaceflight, Environment, Radio Science Subsystem, Huygens, Cassini, Goldstone Deep Space Communications Complex, Cassini–Huygens timeline, Saturn, Jet Propulsion Laboratory, Radio telescopes, Spacecraft