-------- Original Message -------- Subject: SILS Bulletin 09-01 Geologic map of Helen Planitia quad Venus Date: Fri, 23 Jan 2009 09:05:36 -0700 From: Sheryle J Jackson <[log in to unmask]> To: undisclosed-recipients:; SILS Information Bulletin Number: 09-01 *Geologic map of the Helen Planitia Quadrangle (V-52) Venus * * *By Ivan Lopez and Vicki L. Hansen Date: January 23 2009 *Stock #: 208823 (Scientific Investigation Map 3026)* *Price: $7.00 for the map and report plus $5.00 handling per order* Prepared for the National Aeronautics and Space Administration, the geologic map of the Helen Planitia quadrangle is the latest addition to a series of maps covering the planet Venus. This map is based on data from the Magellan spacecraft. The Magellan spacecraft orbited Venus from August 10, 1990, until it plunged into the Venusian atmosphere on October 12, 1994. Approximately 950 orbits of high-resolution gravity observations were obtained between September 1992 and May 1993 while Magellan was in an elliptical orbit. An additional 1500 orbits were obtained following orbit circularization in mid-1993. These data exist as a 75 degree by 75 degree harmonic field. Mission objectives for the project included (1) improving the knowledge of the geological processes, surface properties, and geologic history of Venus by analysis of surface radar characteristics, topography, and morphology and (2) improving the knowledge of the geophysics of Venus by analysis of Venusian gravity. The Helen Planitia quadrangle (V-52) is located in the southern hemisphere of Venus between latitude 25 degree south and 50 degree south, and between longitude 240 degree east and 270 degree east. Regionally the map area is located at the southern limit of an area of enhanced tectonomagmatic activity and extensional deformation marked by a triangle that has highland apexes at Beta, Alta, and Themis Regiones (BAT anomaly) and is connected by the large extensional belts of Devana, Hecate, and Parga Chasmata. The BAT anomaly covers approximately 20 percent of the Venusian surface. For a complete list of planetary maps or to purchase USGS maps online visit the USGS store at */_http://store.usgs.gov_/* . This map can be downloaded as a 56”x 36” PDF document with an accompanying 26 page pamphlet from */_http://pubs.usgs.gov/sim/3026/_/*. Contact the USGS Science Information and Library Services (SILS) at 1-888-ASK-USGS for information on this or other USGS products. Sheryle Girk-Jackson 303 202 4176, FAX 303 202 4633, email: [log in to unmask] <mailto:[log in to unmask]> Listing of Maps covering the planet *Venus *available for purchase from the US Geological Survey *_Partial Title Ordering #_* Altimetric & Shaded Relief Map of Venus 27393 Aphrodite Planitia Region Map of Venus 28662 Atlas Northern Hemisphere of Venus 28206 Geologic Map of Beta Region Quad (V-17) Venus 208568 Geo Map of Helen Planitia Quad (V-52) Venus 208823 Geo Map of Bell Region Quad (V-9) Venus 113747 Geo Map of Carson Quad (V-43) Venus 28800 Geo Map of Galindo Quad (V-40) Venus 28794 Geo Map of Aino Planitia Quad (V-46) Venus 116099 Geo Map of Atalanta Planitia Quad (V-4) Venus 116100 Geo Map of Barrymore Quad (V-59) Venus 28792 Geo Map of Bereghinya Palnitia Quad (V-8) Venus 116201 Geo Map of Diana Chasma Quad (V-37) Venus 113746 Geo Map of Kaiwan Fluctus Quad (V-44) Venus 113743 Geo Map of Lavania Planitia Quad (V-55) Venus 28856 Geo Map of Mead Quad (V-21) Venus 206307 Geo Map of Meskhent Tessera Quad (V-3) Venus 208510 Geo Map of Mylitta Fluctus Quad (V-61) Venus 207050 Geo Map of Nemesis Tesserae (V-13) Venus 206352 Geo Map of Rusalka Palnitia Quad (V-25) Venus 116037 Geo Map of Taussig Quad (V-39) Venus 205577 Geo Mpa of Ovda Region (V-35) Venus 204959 Geo Map of Pandrosos Dorsa Quad (V-5) Venus 28889 Geo Map of Sif Mons Quad (V-31) Venus 207751 Geo Map of Sappho Patera Quad (V-20) Venus 28816 Geomorphic/Geo Map of N. Hemisphere Venus 28230 Guinevera Planitia Region of Venus 28644 Helen Planitia Region of Venus 28663 Ishtar Terra Region of Venus 28675 Lada Terra Region of Venus 28694 Lavinia Planitia Region of Venus 28661 Niobe Planitia region of Venus 28654 Sedna Planitia Region of Venus 28653 The Planet Venus in 4 Map Sheets 28632 Topographic shaded relief of Venus 27695 Sheryle J. Girk-Jackson Technical Information Specialist/Business Acquisitions USGS/ESIC