Editing 55P/Tempel–Tuttle (section)

==Characteristics==
The nucleus of the comet was observed by [[Hubble Space Telescope]] during the 1998 apparition, and assuming an [[albedo]] of 0.04, its nucleus was estimated to have a mean radius of 1.8 km.{{r|IAUC_6851}} The nucleus has a reddish color, with a B−V 0.75 ± 0.05 and V−R 0.51 ± 0.05.<ref>{{cite journal |last1=Lamy |first1=P. |last2=Toth |first2=I. |title=The colors of cometary nuclei—Comparison with other primitive bodies of the Solar System and implications for their origin |journal=Icarus |date=June 2009 |volume=201 |issue=2 |pages=674–713 |doi=10.1016/j.icarus.2009.01.030}}</ref> A jet was observed emanating from the nucleus and based on its movement the rotation period was calculated to be 15.31 ± 0.03 and 14.79 ± 0.02 hours.{{r|IAUC_6816}} 

The spectrum of the comet revealed the presence of [[diatomic carbon]], NH2 and [Oi]. The relative production rates indicate that the comet is depleted in diatomic carbon when compared with Halley's comet. The gas-to-dust ratio also indicated it was gas rich compared with Halley's comet.<ref>{{cite journal |last1=Hamane |first1=T. |last2=Kawakita |first2=H. |last3=Suzuki |first3=B. |last4=Yano |first4=H. |last5=Yoshida |first5=Michitoshi |last6=Watanabe |first6=J. |title=Gas-to-dust ratio and chemical composition in comet 55P / Tempel–Tuttle |journal=The Institute of Space and Astronautical Science report. S.P |date=1 March 2003 |pages=17–22 |url=https://jaxa.repo.nii.ac.jp/?action=repository_action_common_download&item_id=36698&item_no=1&attribute_id=31&file_no=1}}</ref> The [[infrared]] [[spectrum]] of the comet closely resembled that of a [[black body]] with a temperature of 330 K and lacked [[silicate]] emission that has been detected in other comets.<ref>{{cite journal |last1=Lynch |first1=D |title=3- to 14- μm Spectroscopy of Comet 55P/Tempel–Tuttle, Parent Body of the Leonid Meteors |journal=Icarus |date=March 2000 |volume=144 |issue=1 |pages=187–190 |doi=10.1006/icar.1999.6260}}</ref>

[[William Huggins]] observed the spectrum of the comet in January 1866, making it the second time spectrographic observations of a comet were obtained.<ref>{{cite journal |last= Huggins |first = William |title=II. On the spectrum of comet 1, 1866 |journal=Proceedings of the Royal Society of London |date=31 December 1867 |volume=15 |pages=5–7 |doi=10.1098/rspl.1866.0004}}</ref>