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Size and Shape of (11351) Leucus from Five Occultations

Buie, Marc W. and Keeney, Brian A. and Strauss, Ryder H. and Blank, Ted E. and Moore, John G. and Porter, Simon B. and Wasserman, Lawrence H. and Weryk, Robert J. and Levison, Harold F. and Olkin, Catherine B. and Leiva, Rodrigo and Bardecker, Jerry E. and Brown, Michael E. and Brown, Lilah B and Collins, Michael P. and Davidson, Hugh M. and Dunham, David W. and Dunham, Joan B. and Eaccarino, John A. and Finley, Tiffany J. and Fuller, Lindsay and Garcia, Maria L. and George, Tony and Getrost, Kai and Gialluca, Megan, T. and Givot, Rima M. and Gupton, David and Hanna, William H. and Hergenrother, Carl William and Hernandez, Yamir and Hill, Bryan and Hinton, P. C. and Holt, Timothy R. and Howell, Robert R. and Jewell, Jack Lee and Kamin, Roxanne L. and Kammer, Joshua A. and Kareta, Theodore and Kayl, Gregory J. and Keller, John M. and Kenyon, David A. and Kester, Scott R. and Kidd, John N. and Lauer, Tod R. and Leung, Cecilia W. S. and Lorusso, Zoey R. and Lundgren, Christopher B. and Magana, Lizeth O. and Maley, Paul D. and Marchis, Franck and Marcialis, Robert L. and McCandless, Andrew E. and McCrystal, Delsie Joy and McGraw, Allison Marie and Miller, Kelly E. and Mueller, Beatrice E. A. and Noonan, J. W. and Olsen, Aart M. and Patton, Alexander R. and O’Conner Peluso, Daniel and Person, Michael J. and Rigby, James G. and Rolfsmeier, Alex D and Salmon, Julien J. and Samaniego, Joseph and Sawyer, R. P. and Schulz, David M. and Skrutskie, Michael F. and Smith, Rose J. C. and Spencer, John R. and Springmann, Alessondra and Stanbridge, Dale R. and Stoffel, Timothy J. and Tamblyn, Peter and Tobias, Bryan and Verbiscer, Anne J. and von Schalscha, Michael P. and Werts, Holly and Zhang, Qicheng (2021) Size and Shape of (11351) Leucus from Five Occultations. The Planetary Science Journal, 2 (5). Art. No. 202. ISSN 2632-3338. doi:10.3847/psj/ac1f9b.

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We present observations of five stellar occultations for (11351) Leucus and reports from two efforts on (21900) Orus. Both objects are prime mission candidate targets for the Lucy Discovery mission. Combined results for Leucus indicate a very dark surface with p_V = 0.037 ± 0.001, which is derived from the average of the multichord occultations. Our estimate of the triaxial ellipsoidal shape is for axial diameters of 63.8 × 36.6 × 29.6 km assuming that the spin pole is normal to the line of sight. The actual shape of the object is only roughly elliptical in profile at each epoch. Significant topography is seen with horizontal scales up to 30 km and vertical scales up to 5 km. The most significant feature is a large depression on the southern end of the object as seen from a terrestrial viewpoint. For this work we developed a method to correct for differential refraction, accounting for the difference in color between the target object and the reference stars for astrometry derived from ground-based images.

Item Type:Article
Related URLs:
URLURL TypeDescription
Buie, Marc W.0000-0003-0854-745X
Keeney, Brian A.0000-0003-0797-5313
Porter, Simon B.0000-0003-0333-6055
Wasserman, Lawrence H.0000-0001-5769-0979
Weryk, Robert J.0000-0002-0439-9341
Levison, Harold F.0000-0001-5847-8099
Olkin, Catherine B.0000-0002-5846-716X
Leiva, Rodrigo0000-0002-6477-1360
Brown, Michael E.0000-0002-8255-0545
Dunham, David W.0000-0001-7527-4207
Gialluca, Megan, T.0000-0002-2587-0841
Hinton, P. C.0000-0001-9504-0520
Holt, Timothy R.0000-0003-0437-3296
Kammer, Joshua A.0000-0002-3441-3757
Kareta, Theodore0000-0003-1008-7499
Keller, John M.0000-0002-0915-4861
Kidd, John N.0000-0002-4010-3050
Lauer, Tod R.0000-0003-3234-7247
Marchis, Franck0000-0001-7016-7277
Miller, Kelly E.0000-0001-5657-137X
Mueller, Beatrice E. A.0000-0001-6194-3174
Noonan, J. W.0000-0003-2152-6987
Person, Michael J.0000-0003-0000-0572
Salmon, Julien J.0000-0002-5977-3724
Sawyer, R. P.0000-0002-1064-9132
Skrutskie, Michael F.0000-0001-8671-5901
Springmann, Alessondra0000-0001-6401-0126
Verbiscer, Anne J.0000-0002-3323-9304
Zhang, Qicheng0000-0002-6702-191X
Additional Information:© 2021. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2020 June 8; revised 2021 August 2; accepted 2021 August 3; published 2021 September 24. This work was largely supported by the Lucy Mission, which is funded through the NASA Discovery program on contract No. NNM16AA08C. Funding for RECON was provided by grants from NSF AST-1413287, AST-1413072, AST-1848621, and AST-1212159. Funding for F. Marchis was provided by a grant from NSF AST-1743015. Pan-STARRS is supported by the National Aeronautics and Space Administration under grant No. 80NSSC18K0971 issued through the SSO Near Earth Object Observations Program. The Pan-STARRS1 Surveys (PS1) and the PS1 public science archive have been made possible through contributions by the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg, and the Max Planck Institute for Extraterrestrial Physics, Garching, Johns Hopkins University, Durham University, the University of Edinburgh, the Queen's University Belfast, the Harvard-Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under grant No. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation grant No. AST-1238877, the University of Maryland, Eotvos Lorand University (ELTE), the Los Alamos National Laboratory, and the Gordon and Betty Moore Foundation. Thanks to all our other essential contributors for the observing campaigns: Scott Adams, Seth Anthony, Teri Ast, David Barrows, Becky Bobick, Dick Bobick, Bill Boynton, Jesus Bustos, Brian E. Cain, Rene Cardenas, Catalina Chapman, Nina Chevalier, John G. Compton, Dorey W. Conway, Kenneth B. Conway, Richard L. Cunningham, Chris Erickson, Robert Ewing, Paul S. Facuna, Rick E. Frankenberger, Corbin Fredland, Phylis L. Hanna, Hugh C. Harris, Ryuga Hatano, Kevin R. Healy, Frances Healy, Jonathan Jacob Hernandez, Mark Hickinbotham, Tyler Frederick Hilgendorf, Bekah Hillard, Kimberly Jeanine Hollingsworth, Sam F. Insana, Robert A. Jones, Richard L. Karohl, Jim Kochenderfer, Christopher Koers, Kevin R. Kotara, Svitlana Kroll, Arnaud Malvache, Laurent Marfisi, Alexis Martin, Keitha McCandless, Mel E. McClure, Randy McKnight, Chuck McPartlin, Randle L. Mellen, Terry R. Miller, Crystal Moczygemba, Rod G. Moorehead, Sean Moss, Juan Munoz, Olivia Newton, Nidhi R Patel, Anthony J. Pistilli, Ryan Rickerson, Matthew Riehle, Susan K. Rost, Jack Rost, Eric Sahr, Jade Salazar, Ramsey Schar, Jim Scotti, Tiffany Severson, Myron Smith, Maria Stothoff, Stuart A. Stothoff, Emma Tibay, Kimberly Valenzuela, Kathryn Volk, Dannie Wayne Wagoner, Michelle Wilkinson, William Wilkinson, Robert P. Williams, Peggy Yeargain, Michael K. Young, and Amanda M. Zangari.
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:Stellar occultation; Jupiter trojans; Astrometry
Issue or Number:5
Classification Code:Unified Astronomy Thesaurus concepts: Stellar occultation (2135); Jupiter trojans (874); Astrometry (80)
Record Number:CaltechAUTHORS:20211008-224616285
Persistent URL:
Official Citation:Marc W. Buie et al 2021 Planet. Sci. J. 2 202
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111318
Deposited By: George Porter
Deposited On:12 Oct 2021 15:20
Last Modified:12 Oct 2021 15:20

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