Europlanet Science Congress 2021
Virtual meeting
13 – 24 September 2021
Europlanet Science Congress 2021
Virtual meeting
13 September – 24 September 2021
EPSC Abstracts
Vol. 15, EPSC2021-464, 2021, updated on 21 Jul 2021
https://doi.org/10.5194/epsc2021-464
European Planetary Science Congress 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Study of the changes of the distribution of spectral properties of S-type asteroidal dynamical families with age: Mean values and Skewness.

Mario Daniel Melita1, Eduardo Tello-Huanca2, Zuzana Kanuchova3, Giovanni Strazzulla4, and Rosario Brunetto5
Mario Daniel Melita et al.
  • 1IAFE (CONICET-UBA). Facultad de Astronomía y Geofísica (UNLP), Instituto de Tecnología (UNAHUR), Argentina
  • 2IAFE (CONICET-UBA). Facultad de Astronomía y Geofísica (UNLP), Argentina
  • 3Astronomical Institute of Slovak Academy of Sciences, SK-059 60 Tatranska Lomnica, Slovakia
  • 4INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania
  • 5Institut d'Astrophysique Spatiale, CNRS, UMR-8617, Universite Paris-Sud, batiment 121, F-91405 Orsay Cedex, France

Correlations between family-age and the mean value of slope of the spectral distribution, caused by the cumulative effect of cosmic irradiation, have been established for S-type dynamical families by many authors. We noticed that if there is a variety in the primordial surface composition, then the typical timescale that determines the speed of this evolution is bound to have a range of values. Consequently, as the mean value of the color distribution tends to steeper (redder) slopes, a progressive skewness in this distribution should develop. Using SDSS-MOC-4 colors and NEOWISE albedos, we cross-examined the S-type families members as defined by both Nesvorny et al. (2015) and Spotto et al (2015) and retained only members with albedos and colors in the characteristic range of the S-types. We corroborate the color evolution with age and we compare our results with previous estimations. Using only the "true S-type" family members, we also find a significative correlation between some particular skewness-estimation parameters and age. Our results offer additional evidence of the effects of cosmic-radiation on asteroidal surfaces and may provide possible new relations to determine the age of S-type dynamical families. 

References

Nesvorny D.(2015). NASA Planetary Data System, id. EAR-A-VARGBDET-5-NESVORNYFAM-V3.0

Spoto, F.; Milani, A.; Knežević, Z. (2015). Asteroid family ages. Icarus, Volume 257, p. 275-289.

How to cite: Melita, M. D., Tello-Huanca, E., Kanuchova, Z., Strazzulla, G., and Brunetto, R.: Study of the changes of the distribution of spectral properties of S-type asteroidal dynamical families with age: Mean values and Skewness., European Planetary Science Congress 2021, online, 13–24 Sep 2021, EPSC2021-464, https://doi.org/10.5194/epsc2021-464, 2021.

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