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--(42355) Typhon and Echidna --discovery and notes:

Primary discovered2002 Feb 05from Palomar Observatory, California, USAby NEAT.Alternate designation(s):2002 CR46.Linked to prediscovery observations from 1989 Dec 28.Permanent number assigned 2002 May 26.

Named 2006 Nov 09 for the Greek mythological monster [MPC57951].

Companion discovered2006 Jan 20 by K. S. Noll, W. M. Grundy, D. C. Stephens, and H. F. LevisonusingHubble Space Telescope observations from Hubble Space Telescope.Announced2006 Feb 15 [N06c].Permanent designation I Echidna, assigned 2006 Nov 09; named for the Greek mythological monster [MPC57951].

--Links, more technical:

• CBET 401.
• IAUC 8689.

--Links, less technical:

--Links to ADS abstracts:

• Stansberry, J. A., Grundy, W. M., Mueller, M., Benecchi, S. D., Rieke, G. H., Noll, K. S., Buie, M. W., Levison, H. F., Porter, S. B., & Roe, H. G. 2012, IcarusPhysical properties of trans-neptunian binaries (120347) Salacia-Actaea and (42355) Typhon-Echidna
• Santos-Sanz, P., Lellouch, E., Fornasier, S., Kiss, C., Pal, A., Müller, T. G., Vilenius, E., Stansberry, J., Mommert, M., Delsanti, A., Mueller, M., Peixinho, N., Henry, F., Ortiz, J. L., Thirouin, A., Protopapa, S., Duffard, R., Szalai, N., Lim, T., Ejeta, C., Hartogh, P., Harris, A. W., & Rengel, M. 2012, Astronomy and Astrophysics"TNOs are Cool": A survey of the trans-Neptunian region. IV. Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel-PACS
• Alvarez-Candal, A., Barucci, M. A., Merlin, F., de Bergh, C., Fornasier, S., Guilbert, A., & Protopapa, S. 2010, Astronomy and AstrophysicsThe trans-Neptunian object (42355) Typhon: composition and dynamical evolution
• Alvarez-Candal, Alvaro & Barucci, Maria Antonietta 2010, IAU SymposiumWater alteration on (42355) Typhon?
• Antonieta Barucci, Maria, Fornasier, S., Alvarez-Cantal, A., de Bergh, C., Merlin, F., DeMeo, F., & Dumas, C. 2009, AAS/Division for Planetary Sciences Meeting Abstracts #41Surface Properties of TNOs: Preliminary Statistical Analysis
• Dotto, E., Perna, D., Barucci, M. A., Rossi, A., de Bergh, C., Doressoundiram, A., & Fornasier, S. 2008, Astronomy and AstrophysicsRotational properties of Centaurs and Trans-Neptunian Objects. Lightcurves and densities
• Grundy, W. M., Noll, K. S., Virtanen, J., Muinonen, K., Kern, S. D., Stephens, D. C., Stansberry, J. A., Levison, H. F., & Spencer, J. R. 2008, Icarus(42355) Typhon Echidna: Scheduling observations for binary orbit determination
• Perna, Davide, Dotto, E., Barucci, A., Rossi, A., de Bergh, C., Doressoundiram, A., & Fornasier, S. 2008, Bulletin of the American Astronomical SocietyLight Curves and Densities of Centaurs and Trans-Neptunian Objects from the ESO Large Program
• Dotto, Elisabetta, Perna, D., Barucci, M. A., de Bergh, C., Doressoundiram, A., & Fornasier, S. 2007, Bulletin of the American Astronomical SocietyRotational Properties of Centaurs and KBOs
• Rieke, George & Stansberry, John 2007, Spitzer ProposalKuiper Belt Albedoes and Densities
• Noll, K. S. 2006, International Astronomical Union Circular(42355), (58534), (65489)
• Noll, Keith S., Levison, Harold F., Grundy, Will M., & Stephens, Denise C. 2006, IcarusDiscovery of a binary Centaur
• Grundy, William M., Stansberry, J. A., Noll, K. S., Stephens, D. C., Kern, S. D., Spencer, J. R., Trilling, D. E., Cruikshank, D. P., & Levison, H. F. 2006, Bulletin of the American Astronomical SocietyThe Orbit, Mass, Size, Albedo, and Density of the Binary Centaur (65489) 2003 FX<SUB>128</SUB>
• Noll, K. S., Grundy, W. M., Stephens, D. C., & Levison, H. F. 2006, International Astronomical Union Circular(42355) 2002 CR_46
• Noll, K. S., Grundy, W. M., Stephens, D. C., & Levison, H. F. 2006, Central Bureau Electronic Telegrams(42355) 2002 CR_46
• Stansberry, J. A., Cruikshank, D. P., Grundy, W. G., Margot, J. L., Emery, J. P., Fernandez, Y. R., & Rieke, G. H. 2005, Bulletin of the American Astronomical SocietyAlbedos, Diameters (and a Density) of Kuiper Belt and Centaur Objects
• Ortiz, J. L., Gutiérrez, P. J., Casanova, V., & Sota, A. 2003, Astronomy and AstrophysicsA study of short term rotational variability in TNOs and Centaurs from Sierra Nevada Observatory
• Stoss, R. & Marsden, B. G. 2002, Minor Planet Electronic Circulars2002 CR46
• McNaught, R. H., Stevens, B., Helin, E. F., Pravdo, S., Lawrence, K., Hicks, M., Hovland, E., Bickler, T., Schroeder, J., Scherr, L., Thicksten, R., Deetz, A., Smalley, K., Trentman, R., Scotti, J. V., Laurie, S. P., & Marsden, B. G. 2002, Minor Planet Electronic Circulars2002 CR46

©2006-2014, 2015by Wm. Robert Johnston.
Last modified31 January 2015.
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