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Photometry of Centaurs and trans-Neptunian objects: 2060 Chiron (1977 UB), 10199 Chariklo (1997 CU26), 38628 Huya (2000 EB173), 28978 Ixion (2001 KX76), and 90482 Orcus (2004 DW)

  • M. Galiazzo
  • C. de la Fuente Marcos
  • R. de la Fuente Marcos
  • G. CarraroEmail author
  • M. Maris
  • M. Montalto
Original Article

Abstract

Both Centaurs and trans-Neptunian objects (TNOs) are minor bodies found in the outer Solar System. Centaurs are a transient population that moves between the orbits of Jupiter and Neptune, and they probably diffused out of the TNOs. TNOs move mainly beyond Neptune. Some of these objects display episodic cometary behaviour; a few percent of them are known to host binary companions. Here, we study the light-curves of two Centaurs—2060 Chiron (1977 UB) and 10199 Chariklo (1997 CU26)—and three TNOs—38628 Huya (2000 EB173), 28978 Ixion (2001 KX76), and 90482 Orcus (2004 DW)—and the colours of the Centaurs and Huya. Precise, \(\sim1~\%\), \(R\)-band absolute CCD photometry of these minor bodies acquired between 2006 and 2011 is presented; the new data are used to investigate the rotation rate of these objects. The colours of the Centaurs and Huya are determined using \(\mathit{BVRI}\) photometry. The point spread function of the five minor bodies is analysed, searching for signs of a coma or close companions. Astrometry is also discussed. A periodogram analysis of the light-curves of these objects gives the following rotational periods: \(5.5\pm0.4~\mbox{h}\) for Chiron, \(7.0\pm 0.6~\mbox{h}\) for Chariklo, \(4.45\pm0.07~\mbox{h}\) for Huya, \(12.4\pm0.3~\mbox{h}\) for Ixion, and \(11.9\pm0.5~\mbox{h}\) for Orcus. The colour indices of Chiron are found to be \(B-V=0.53\pm0.05\), \(V-R=0.37\pm0.08\), and \(R-I=0.36\pm0.15\). The values computed for Chariklo are \(V-R=0.62\pm0.07\) and \(R-I=0.61\pm0.07\). For Huya, we find \(V-R=0.58\pm0.09\) and \(R-I=0.64\pm0.20\). Our rotation periods are similar to and our colour values are consistent with those already published for these objects. We find very low levels of cometary activity (if any) and no sign of close or wide binary companions for these minor bodies.

Keywords

Minor planets, asteroids: individual: 2060 Chiron (1977 UB) Minor planets, asteroids: individual: 10199 Chariklo (1997 CU26Minor planets, asteroids: individual: 38628 Huya (2000 EB173Minor planets, asteroids: individual: 28978 Ixion (2001 KX76Minor planets, asteroids: individual: 90482 Orcus (2004 DW) Techniques: photometric 

Notes

Acknowledgements

We thank the anonymous referee for her/his constructive and helpful reports. M.G. and G.C. express their gratitude to S. Ortolani and S. Marchi for many useful discussions and advice. We thank R. Mateluna and L. Jílková for their help with the observations. In preparation of this paper, we made use of the NASA Astrophysics Data System, the ASTRO-PH e-print server, the JPL Small-Body Database, the MPC data server, and the AstDyS information service.

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • M. Galiazzo
    • 1
  • C. de la Fuente Marcos
    • 2
  • R. de la Fuente Marcos
    • 2
  • G. Carraro
    • 3
    • 6
    Email author
  • M. Maris
    • 4
  • M. Montalto
    • 5
  1. 1.Department of Physics and AstronomyThe University of Western OntarioLondonCanada
  2. 2.MadridSpain
  3. 3.European Southern ObservatorySantiago 19Chile
  4. 4.Osservatorio Astronomico di TriesteINAFTriesteItaly
  5. 5.Centro de Astrofísica da Universidade do Porto, (CAUP)PortoPortugal
  6. 6.Dipartimento di Fisica e AstronomiaUniversità degli Studi di PadovaPadovaItaly

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