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 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.
| Original language | English |
|---|---|
| Article number | L11 |
| Journal | Astronomy and Astrophysics |
| Volume | 568 |
| DOIs | |
| Publication status | Published - 1 Jan 2014 |
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Keywords
- Kuiper belt objects: individual: 10199 Chariklo
- Methods: observational
- Techniques: photometric
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
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.; Bramich, D. M.
In: Astronomy and Astrophysics, Vol. 568, L11, 01.01.2014.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The Centaur 10199 Chariklo
T2 - Investigation into rotational period, absolute magnitude, and cometary activity
AU - Fornasier, S.
AU - Lazzaro, D.
AU - Alvarez-Candal, A.
AU - Snodgrass, C.
AU - Tozzi, G. P.
AU - Carvano, J. M.
AU - Jiménez-Teja, Y.
AU - Silva, J. S.
AU - Bramich, D. M.
PY - 2014/1/1
Y1 - 2014/1/1
N2 - 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.
AB - 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.
KW - Kuiper belt objects: individual: 10199 Chariklo
KW - Methods: observational
KW - Techniques: photometric
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UR - http://www.scopus.com/inward/citedby.url?scp=84906565203&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201424439
DO - 10.1051/0004-6361/201424439
M3 - Article
VL - 568
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 0004-6361
M1 - L11
ER -