809 Lundia – podwójna zagadka

• Authors: Agnieszka Kryszczyńska , Magdalena Polińska

Title variants

EN

809 Lundia – binary puzzle

• Languages of publication: PL

Abstracts

EN

CCD photometry of 809 Lundia obtained from September 2005 till January 2006 at Borowiec and Pic du Midi Observatories shows that this object is a synchronous binary system with an orbital period of 15.418 ±0.001 h. In this paper we present the results of photometric observations of Lundia from two oppositions in 2005/2006 and 2007 as well as the first modelling of the system. For sake of simplicity we have assumed a fluid like nature for each component in modified Roche model and triaxial ellipsoid shape in kinematic model. Our models gave similar results. Triaxial ellipsoid shape solutions and separation between components are given after taking an equivalent diameter of 9.1 km from H = 11.8 mag and assuming an albedo of 0.4. Orbital period of the Lundia system obtained from modelling is the same as from lightcurve analysis 15.418 ± 0.001 h. Bulk density of both components is 1.64 or 1.71 ± 0.01 g/ccm. The double system of Lundia likely originates from the fission process of a single body that could have been spun up by the YORP effect. The predicted lightcurves for future oppositions are also presented.

Keywords

EN

formation; minor planets; photometry; planets and satellites

Discipline

• ASTRONOMY: ASTRONOMY

• Journal: Acta Societatis Metheoriticae Polonorum
• Year: 2009
• Volume: 1
• Pages: 90-96

Contributors

author

Agnieszka Kryszczyńska

• Obserwatorium Astronomiczne, Uniwersytet im. Adama Mickiewicza, Poznań

author

Magdalena Polińska

• Obserwatorium Astronomiczne, Uniwersytet im. Adama Mickiewicza, Poznań

References

• Britt D.T., et. al. 2002. In Asteroids III, Univ. Arizona Press, 395.
• Britt D.T., Consolmagno G.J., 2004. 35th Lunar and Planetary Science Conference, League City, Texas. abst. 2108.
• Carruba V., et. al. 2005. Astron. Astrophys. 441. 819.
• Chrboneau P. 1995. ApJS 101. 309.
• Cheng A. and The HYABUSA Team. 2009. Planet. Space. Sci. in press.
• Descamps P., Marchis F., Michałowski T. et al. 2007. Icarus. 187. 482.
• Descamps P., Marchis F., 2008. Icarus. 193. 74.
• Florczak M., Lazzaro D., Duffard R., 2002. Icarus. 159. 178.
• Kryszczyńska A., et. al. 2005. CBET. 229.
• Somma M., 1988, Cel. Mech., 41. 389.
• Vokrouhlicky D et. al. 2003. Nature. 425. 147.
• Vokrouhlicky D., Capek D., Chesley S.R., Ostro S.J., 2005. Ikarus. 179.128.
• Zappala V., BendjoyA.P., Cellino A., et al. 1995. Icarus 116. 291.

• Document Type: article