Size and Albedo of the Object of Interstellar Origin A/2017U1

Download PDF (339.2 KB) PP. 47 - 49 Pub. Date: May 8, 2018

DOI: 10.22606/adap.2018.32001

Author(s)

N.Chandra Wickramasinghe^*
Buckingham Centre for Astrobiology, University of Buckingham, UK
Janaki T. Wickramasinghe
Buckingham Centre for Astrobiology, University of Buckingham, UK
Daryl H. Wallis
Institute for the Study of Panspermia and Astrobiology, Gifu, Japan

Abstract

The interstellar object A/2017U1 has been reported to possess a highly elongated shape with a characteristic average radius of 102m. We argue that the evolution of an organic-rich cometary surface in interstellar space could lead to the formation of an aerogel-like surface with an albedo of 0.0005 leading to a more realistic characteristic dimension of ~1000m.

Keywords

Comets, albedo, size

References

[1] Meech, K.J., Weryk, R., Micheli, M. et al., (2017). Discovery and characterisation of the first known interstellarobject, Nature, November 2017

[2] Wickramasinghe, N.C. et al. (2018) “Oumuamua (A/2017U1)-A Confirmation of Links between GalacticPlanetary Systems,” Advances in Astrophysics, 3(1): 43-46.

[3] Wickramasinghe, J.T., Wickramasinghe, N.C. and Napier, W.M., (2013) Comets and the Origin of Life (WorldScientific Press)

[4] Wickramasinghe, J.T., (2007). The role of comets in panspermia (Cardiff University PhD thesis)

[5] Rietmeijer, F. J. M., (2002). In: E. Murad and I.P. Williams, eds. Meteors in the Earth’s Atmosphere. Cambridge:Cambridge Univ. Press, pp. 215.

[6] Bohren, C. F., Wickramasinghe, N. C., (1977). On the computation of optical properties of heterogeneous grains.Astrophys. and Space Sci., 50, pp. 461-472.

[7] Nelson, R.M., Soderblom, L.A., Hapke, B.W. (2004) Are the circular dark features on Comet Borrelly’s surfacealbedo variations or pits? Icarus, 167, 37.