The Centaur 10199 Chariklo: investigation into rotational period, absolute magnitude, and cometary activity

Fornasier, S.; Lazzaro, D.; Alvarez-Candal, A.; Snodgrass, C.; Tozzi, G. P.; Carvano, J. M.; Jiménez-Teja, Y.; Silva, J. S. and Bramich, D. M. (2014). The Centaur 10199 Chariklo: investigation into rotational period, absolute magnitude, and cometary activity. Astronomy & Astrophysics, 568, article no. L11.



Context. Rings have recently been discovered around the Centaur 10199 Chariklo.

Aims. In this paper we present new photometric data, obtained at the 4.2 m SOAR Telescope, aiming to investigate Chariklo’s absolute magnitude and rotational period, which is still unknown, and to look for potential cometary activity.

Methods. The field background of the images was very crowded so several approaches were used for the extraction of Chariklo fluxes. The background sources were subtracted using difference image analysis and then aperture photometry was applied. A Fourier polynomial fit was used to determine the period.

Results. We find a synodic rotation period of 7.004±0.036 h. The visual absolute magnitude derived from the SOAR data is Hv = 7.03 ± 0.10. We model the rings’ contribution to the flux, and find that the derived Hv is consistent with the predicted ring system aspect angle. We also revised the Chariklo system albedo (4.2%) and effective radius (119 ± 5 km) from a re-analysis of Herschel and WISE thermal data obtained during 2010 with the correct Hv value. No coma is detected from the SOAR data, nor in previous VLT images acquired in 2007−2008, where the rings’ aspect angle was close to zero. The upper limit to the dust production rate is 2.5 kg/s.

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  • Item ORO ID
  • 43021
  • Item Type
  • Journal Item
  • ISSN
  • 1432-0746
  • Project Funding Details
  • Funded Project NameProject IDFunding Body
    Not SetNot SetFrench Planetology National Programme (INSU-PNP)
    Seventh Framework Programme (FP7/2007−2013)Grant Agreement No. 268421.EU
    Not SetProjects No. 402085/2012-4 and 305369/2009-1CNPq
    Not SetProject No. E-26/102.967/2011FAPERJ
    Not SetProject No. A062/2013The Open University (OU)
    Not SetNPRP grant X-019-1-006The Qatar National Research Fund
  • Keywords
  • Kuiper belt objects-individual-10199 Chariklo; methods-observational; techniques-photometric
  • Academic Unit or School
  • Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
    Faculty of Science, Technology, Engineering and Mathematics (STEM)
  • Research Group
  • ?? space ??
  • Copyright Holders
  • © 2014 ESO
  • Depositing User
  • Colin Snodgrass