'D. Terrell'
- 'O. Burkhonov'
- 'K. E. Ergashev'
- 'Sh. A. Ehgamberdiev'
- 'P. Fatka'
- 'R. Durkee'
- 'E. Lilly Schunova'
- 'R. Ya. Inasaridze'
- 'V. R. Ayvazian'
- 'G. Kapanadze'
- 'N. M. Gaftonyuk'
- 'J. A. Sanchez'
- 'V. Reddy'
- 'L. McGraw'
- 'M. S. Kelley'
- 'I. E. Molotov'
title: 'A satellite orbit drift in binary near-Earth asteroids (66391) 1999 KW4 and (88710) 2001 SL9 — Indication of the BYORP effect'
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Proposed running head: BYORP effect on 1999 KW4 and 2001 SL9

Editorial correspondence to:\
Peter Scheirich, Ph.D.\
Astronomical Institute AS CR\
Fričova 1\
Ondřejov\
CZ-25165\
Czech Republic\
Phone: 00420-323-620115\
Fax: 00420-323-620263\
E-mail address: petr.scheirich@gmail.com\

Asteroids, dynamics; Near-Earth objects; Photometry

Introduction {#Introduction}
============

Binary asteroids exhibit interesting internal dynamics driven by thermal emission from irregularly shaped components, but there is only one study constraining its limits based on direct measurements so far. Scheirich et al. (2015) found an upper limit on drift of the mutual orbit 