2017
DOI: 10.3847/1538-4357/aa7ed3
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2004 TT357: A Potential Contact Binary in the Trans-Neptunian Belt

Abstract: We report photometric observations of the trans-Neptunian object 2004 TT 357 obtained in 2015 and 2017 using the 4.3 m Lowell's Discovery Channel Telescope. We derive a rotational period of 7.79±0.01 h and a peak-to-peak lightcurve amplitude of 0.76±0.03 mag. 2004 TT 357 displays a large variability that can be explained by a very elongated single object or can be due to a contact/close binary. The most likely scenario is that 2004 TT 357 is a contact binary. If it is in hydrostatic equilibrium, we find that t… Show more

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Cited by 17 publications
(8 citation statements)
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“…The V-shaped light curve minima observed from 1I could be an indication of binarity (Knight et al 2017, Thirouin et al 2017. From the observations obtained for the object to date, however, it is not possible to determine if this is the case.…”
Section: Discussion and Caveatsmentioning
confidence: 99%
“…The V-shaped light curve minima observed from 1I could be an indication of binarity (Knight et al 2017, Thirouin et al 2017. From the observations obtained for the object to date, however, it is not possible to determine if this is the case.…”
Section: Discussion and Caveatsmentioning
confidence: 99%
“…Results of the 17 July 2017 stellar occultation by Ultima indicate that this object displays a very irregular shape and could even be a close or contact binary (Buie et al, , ; Zangari et al, ). Binaries are common in the Kuiper Belt (Noll et al, ), including contact binaries (Lacerda, ; Lacerda et al, ; Thirouin et al, ; Thirouin & Sheppard, ), and it has been argued that many short period comets, such as 67P/Churyumov‐Gerasimenko, 8P/Tuttle, and 103P/Hartley 2, and even 19P/Borrely and 1P/Halley, were formed as or evolved to be contact binaries (or more generally, bilobate bodies; Harmon et al, ; Nesvorný et al, ; Rickman et al, ), albeit from smaller components than the ostensible components of Ultima. Gravitational collapse of “pebble clouds” in the solar nebula is predicted to have naturally and efficiently formed binaries in the Kuiper belt, and with subequal mass ratios (Nesvorný et al, ).…”
Section: Shape and Structurementioning
confidence: 99%
“…The calibration and reduction of our images were performed following the procedure described in Thirouin et al (2014Thirouin et al ( , 2016. The search for periodicities has been done with the same techniques mentioned in Thirouin et al (2017). Finally, the color and solar phase curve studies were performed as in Thirouin et al (2012).…”
Section: Observations and Analysismentioning
confidence: 99%
“…We show the FWHM of TNOs with large amplitude lightcurves (∆m>0.15 mag) from Thirouin et al (2010Thirouin et al ( , 2012Thirouin et al ( , 2014Thirouin et al ( , 2016; Sheppard (2007); Jewitt & Sheppard (2002) and likely contact binaries from Thirouin et al (2017); Lacerda et al (2014); Sheppard & Jewitt (2004) in Figure 2. In this Figure, we plot all four FWHM of these objects: two for the U-FWHM for the maximum and two for the V-FWHM for the minimum.…”
Section: V-shape and U-shape: Definitionmentioning
confidence: 99%
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