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.

DOI: https://doi.org/10.1051/0004-6361/201424439

Abstract

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 H_v = 7.03 ± 0.10. We model the rings’ contribution to the flux, and find that the derived H_v 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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About

• Item ORO ID
• 43021
• Item Type
• Journal Item
• ISSN
• 1432-0746
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	Not Set	French Planetology National Programme (INSU-PNP)
  Seventh Framework Programme (FP7/2007−2013)	Grant Agreement No. 268421.	EU
  Not Set	Projects No. 402085/2012-4 and 305369/2009-1	CNPq
  Not Set	Project No. E-26/102.967/2011	FAPERJ
  Not Set	Project No. A062/2013	The Open University (OU)
  Not Set	NPRP grant X-019-1-006	The 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