Solar System Research

, Volume 40, Issue 3, pp 214–218 | Cite as

On the bulk density of the M-type asteroid 16 Psyche

  • D. F. Lupishko
Article

Abstract

Recent estimates of the bulk density of the largest M-type asteroid 16 Psyche (1.4 and 1.8 g/cm3) seem to be too low for asteroids of this type. The interpretation of such low densities for the asteroid 16 Psyche with its increased metal content led to estimates of its macroporosity of 70%. In the present paper, it has been shown that the extremely low density estimates are caused primarily by the usage of a very high value of the IRAS diameter of the asteroid (D = 264 km, which corresponds to an IRAS albedo of 0.10). The application of the more accurate polarimetric albedo (0.170) and diameter (213 km) of Psyche results in a bulk density of the asteroid of 3.3 ± 0.7 g/cm3. For a moderate asteroid macroporosity of 30–40%, this density even agrees with the 50% metal content and, therefore, removes both the contradiction with the radar data and the problems of the very low density and unlikely high porosity of the asteroid 16 Psyche.

PACS numbers

96.12.Pc 96.30.Ys 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Batrakov, Yu.V., Kochetov, O.M., Skripnichenko, V.I., et al., Eds., Efemeridy malykh planet na 2004 god (Ephemeris of Small Planets in 2004), St. Petersburg: IPA RAN, 2004.Google Scholar
  2. Belskaya, I.N. and Lagerkvist, C.-I., Physical Properties of M Class Asteroids, Planet. Space Sci., 1996, vol. 44, no. 8, pp. 783–794.CrossRefADSGoogle Scholar
  3. Britt, D.T., Yeomans, D., Housen, K., and Consolmagno, G., Asteroid Density, Porosity, and Structure, in Asteroids III, Bottke, W.F., Jr., Cellino, A., Paolicchi, P., and Binzel, R.P., Eds., Tucson: Univ. Arizona Press, 2002, pp. 485–500.Google Scholar
  4. Busarev, V.V., Spectral Features of M-Asteroids: 75 Eurydike and 201 Penelope, Icarus, 1998, vol. 131, no. 1, pp. 32–40.CrossRefADSGoogle Scholar
  5. Dollfus, A., Mandeville, J.C., and Duseaux, M., The Nature of the M-Type Asteroids from Optical Polarimetry, Icarus, 1979, vol. 37, no. 1, pp. 124–132.CrossRefADSGoogle Scholar
  6. Harris, A., Asteroid Rotation. II. A Theory for the Collisional Evolution of Rotation Rates, Icarus, 1979, vol. 40, no. 1, pp. 145–153.CrossRefADSGoogle Scholar
  7. Harris, A., Asteroid Lightcurve Studies, Proc. Int. Conf. “Asteroids, Comets, Meteors, II”, Lagerkvist, C.-I., Linblad, B.A., Lundstedt, H., and Rickman, H., Eds., Sweden: Uppsala Univ., 1985, pp. 35–44.Google Scholar
  8. Heinz, K., Phasen Des System Eisen-Silizium in Einem Meteoriten, Radex Rdsch, 1988, no. 1, pp. 536–547.Google Scholar
  9. Hilton, J.L., Asteroid Masse and Densities, Asteroids III, Bottke, W.F., Jr., Cellino, A., Paolicchi, P., and Binzel, R.P., Eds., Tucson: Univ. Arizona Press, 2002, pp. 103–112.Google Scholar
  10. Kochetova, O.M., Application of New Criteria for Selection of Perturbed Asteroids for Determination of Masses of Perturbing Asteroids by Dynamical Method, Soobshch. IPA RAN, St. Petersburg, 2003, no. 165.Google Scholar
  11. Kuznetsov, V.B., Determination of Masses of 108 Asteroids, Soobshch. IPA RAN, St. Petersburg, 2001, no. 138.Google Scholar
  12. Lagerkvist, C.-I., Belskaya, I.N., Erikson, A., et al., Physical Studies of Asteroids. XXXIII. The Spin Rate of M-Type Asteroids, Astron. Asrtrophys., Suppl. Ser., 1998, vol. 131, pp. 55–62.CrossRefADSGoogle Scholar
  13. Lupishko, D.F., Bel’skaya, I.N., Tupieva, F.A., and Chernova, G.P., UBV Photometry of the M-type Asteroids 16 Psyche and 22 Kalliope, Astron. Vestn., 1982, vol. 16, no. 2, pp. 101–108 [Sol. Syst. Res. (Engl. Transl.), 1982, vol. 16, no. 2, pp. 75–80].ADSGoogle Scholar
  14. Lupishko, D.F. and Belskaya, I.N., On the Surface Composition of the M-Type Asteroids, Icarus, 1989, vol. 78, no. 2, pp. 395–401.CrossRefADSGoogle Scholar
  15. Lupishko, D.F. and Mohamed, R.A., A New Calibration of the Polarimetric Albedo Scale of Asteroids, Icarus, 1996, vol. 119, no. 1, pp. 209–213.CrossRefADSGoogle Scholar
  16. Lupishko, D.F., Photometry and Polarimetry of Asteroids: Results of Observations and Data Analysis, Doctoral Dissertation, Khar’kov, 1998a.Google Scholar
  17. Lupishko, D.F., Improved IRAS Albedos and Diameters of Asteroids, Astron. Vestn., 1998b, vol. 32, no. 2, pp. 141–146 [Sol. Syst. Res. (Engl. Transl.), 1998b, vol. 32, no. 2, pp. 122–127].Google Scholar
  18. Ostro, S.J., Hudson, R.S, Benner, L.A.M, et al., Asteroid Radar Astronomy, Asteroids III, Bottke, W.F., Jr., Cellino, A., Paolicchi, P., and Binzel, R.P., Eds., Tucson: Univ. Arizona Press, 2002, pp. 151–168.Google Scholar
  19. Rivkin, A.S., Howell, E.S., Britt, D.T., et al., 3-μm Spectrophotometric Survey of M-and E-Class Asteroids, Icarus, 1995, vol. 117, no. 1, pp. 90–100.CrossRefADSGoogle Scholar
  20. Rivkin, A.S., Lebofsky, L.A., Britt, D.T., and Howell, E.S., Three-Micron Survey of E-and M-Class Asteroids: Final Results, Bull. Am. Astron. Soc., 1997, vol. 29, no. 3, pp. 972–973.ADSGoogle Scholar
  21. Shevchenko, V.G. and Lupishko, D.F., Optical Properties of Asteroids from Photometric Data, Astron. Vestn., 1998, vol. 32, no. 3, pp. 250–263 [Sol. Syst. Res. (Engl. Tansl.), 1998, vol. 32, no. 3, pp. 220–232].ADSGoogle Scholar
  22. Tedesco, E.F. and Veeder, G.J., IMPS Albedos and Diameters Catalog (FP 102), in IRAS Minor Planet Survey, Tedesco, E.F., Veeder, G.J., Flower, J.W., and Chillemi, J.R., Eds., MA (USA): Hanscom Air Force Base, 1992, pp. 243–285; Philips Lab. Final Report PL-TR-92-2049.Google Scholar
  23. Viateau, B., Mass and Density of Asteroids 16 Psyche and 121 Hermione, Astron. Astrophys., 2000, vol. 354, pp. 725–731.ADSGoogle Scholar
  24. Zotkin, I.T., Medvedev, R.V., and Gorbatsevich, F.F., Strength Properties of Tsarev Meteorite, Meteoritika, 1987, no. 46, pp. 86–93.Google Scholar
  25. Zotkin, I.T. and Tsvetkov, V.I., Dissipation and Bedding Character of Chinge Meteorite, Meteoritika, 1989, no. 48, pp. 3–9.Google Scholar

Copyright information

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • D. F. Lupishko
    • 1
  1. 1.Institute of AstronomyKharkiv National UniversityKharkivUkraine

Personalised recommendations