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| 題名: | Pan-starrs 1 observations of the unusual active centaur P/2011 S1(Gibbs) |
| 作者: | 葉永烜;Lin, H. W.;Chen, Y. T.;Lacerda, P.;Ip, W. H.;Holman, M.;Protopapas, P.;Chen, W. P.;Burgett, W. S.;Chambers, K. C.;Flewelling, H.;Huber, M. E.;Jedicke, R.;Kaiser, N.;Magnier, E. A.;Metcalfe, N.;Price, P. A. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Active control;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;COLOR;Comet heads;Comet nuclei;COMETS;COMPUTERIZED SIMULATION;CONTROL;CURRENTS;DEGASSING;Dwarf planets;EVOLUTION;MASS TRANSFER;Orbitals;ORBITS;Outer solar system;Outgassing;SKY;SOLAR SYSTEM;STELLAR WINDS;SURFACE AREA;SURFACES |
| 日期: | 2014-01-01 |
| 上傳時間: | 2026-04-21 14:24:33 (UTC+8) |
| 出版者: | IOP Publishing Ltd.;United States |
| 摘要: | 摘要： P/2011 S1 (Gibbs) is an outer solar system comet or active Centaur with a similar orbit to that of the famous 29P/Schwassmann-Wachmann 1.P/2011 S1 (Gibbs) has been observed by the Pan-STARRS 1 (PS1) sky survey from 2010 to 2012. The resulting data allow us to perform multi-color studies of the nucleus and coma of the comet. Analysis of PS1 images reveals that P/2011 S1 (Gibbs) has a small nucleus <4 km radius, with colors g sub(P1) - r sub(P1) = 0.5 + or - 0.02, r sub(P1) - i sub(P1) = 0.12 + or - 0.02, and i sub(P1) - z sub(P1) = 0.46 + or - 0.03. The comet remained active from 2010 to 2012, with a model-dependent mass-loss rate of ~100 kg s super(-1). The mass-loss rate per unit surface area of P/2011 S1 (Gibbs) is as high as that of 29P/Schwassmann-Wachmann 1, making it one of the most active Centaurs. The mass-loss rate also varies with time from ~40 kg s super(-1) to 150 kg s super(-1). Due to its rather circular orbit, we propose that P/2011 S1 (Gibbs) has 29P/Schwassmann-Wachmann 1-like outbursts that control the outgassing rate. The results indicate that it may have a similar surface composition to that of 29P/Schwassmann-Wachmann 1. Our numerical simulations show that the future orbital evolution of P/2011 S1 (Gibbs) is more similar to that of the main population of Centaurs than to that of 29P/Schwassmann-Wachmann 1. The results also demonstrate that P/2011 S1 (Gibbs) is dynamically unstable and can only remain near its current orbit for roughly a thousand years.
出版者： United States
出版日期： 2014-05-01
出處： The Astronomical journal, 2014-05, Vol.147 (5), p.114-8
資源來源： Institute of Physics Journals
識別號： ISSN: 0004-6256
識別號： ISSN: 1538-3881
識別號： EISSN: 1538-3881
識別號： DOI: 10.1088/0004-6256/147/5/114 |
| 顯示於類別: | [天文研究所] 期刊論文
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