Long-term photometric monitoring of the dwarf planet (136472) Makemake

10); (10) Institute of Radio Astronomy; (11) Keldysh Institute of Applied Mathematics; (2) Instituto de Astrof\'isica de Andaluc\'ia; (3) Lowell Observatory; (4) Kharadze Abastumani Astrophysical Observatory; 5); (5) Samtskhe-Javakheti State University; (6) INAF -- Osservatorio Astronomico di Roma; 7)

Long-term photometric monitoring of the dwarf planet (136472) Makemake

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arxiv 1904.03679 v1 pith:NK5VPYJZ submitted 2019-04-07 astro-ph.EP

Long-term photometric monitoring of the dwarf planet (136472) Makemake

T. A. Hromakina (1) , I. N. Belskaya (1) , Yu. N. Krugly (1) , V. G. Shevchenko (1) , J. L. Ortiz (2) , P. Santos-Sanz (2) , R. Duffard (2) , N. Morales (2)

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A. Thirouin (3) R. Ya. Inasaridze (4 5) V. R. Ayvazian (4 V. T. Zhuzhunadze (4 D. Perna (6 7) V. V. Rumyantsev (8) I. V. Reva (9) A. V. Serebryanskiy (9) A. V. Sergeyev (1 10) I. E. Molotov (11) V. A. Voropaev (11) S. F. Velichko (1) ((1) Institute of Astronomy Kharkiv Ukraine (2) Instituto de Astrof\'isica de Andaluc\'ia Granada Spain (3) Lowell Observatory AZ USA (4) Kharadze Abastumani Astrophysical Observatory Tbilisi Georgia (5) Samtskhe-Javakheti State University Akhaltsikhe (6) INAF -- Osservatorio Astronomico di Roma Italy (7) LESIA -- Observatoire de Paris Meudon France (8) Crimean Astrophysical Observatory Nauchny Russia (9) Fesenkov Astrophysical Institute Almaty Kazakhstan (10) Institute of Radio Astronomy (11) Keldysh Institute of Applied Mathematics Moscow Russia)

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keywords makemakephotometricabsolutebvridwarffoundlightcurveplanet

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We studied the rotational properties of the dwarf planet Makemake. The photometric observations were carried out at different telescopes between 2006 and 2017. Most of the measurements were acquired in BVRI broad-band filters of a standard Johnson-Cousins photometric system. We found that Makemake rotates more slowly than was previously reported. A possible lightcurve asymmetry suggests a double-peaked period of P = 22.8266$\pm$0.0001~h. A small peak-to-peak lightcurve amplitude in R-filter A = 0.032$\pm$0.005 mag implies an almost spherical shape or near pole-on orientation. We also measured BVRI colours and the R-filter phase-angle slope and revised the absolute magnitudes. The absolute magnitude of Makemake has remained unchanged since its discovery in 2005. No direct evidence of a newly discovered satellite was found in our photometric data; however, we discuss the possible existence of another larger satellite.

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