Parameter estimates for the orbits of M 32 and NGC 205 about the centre of mass of the M 31 system

Details Parameter estimates for the orbits of M 32 and NGC 205 about the centre of mass of the M 31 system Parameter estimates for the orbits of M 32 and NGC 205 about the centre of mass of the M 31 system

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...200...21c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 200, no. 1-2, July 1988, p. 21-25.

Astronomy and Astrophysics

Astrophysics

24

Andromeda Galaxy, Center Of Mass, Elliptical Galaxies, Galactic Rotation, Infrared Photometry, Orbital Elements, Cartesian Coordinates, Dynamic Characteristics, Kinematics, Line Of Sight

Scientific paper

The authors used simple kinematic, dynamic and geometrical assumptions to infer the orbital parameters of M32 and NGC 205 about M31. They find that both galaxies rotate in a retrograde sense compared to M31 indicating a possible common origin independent of the mother galaxy. Their periods, each ≅108yr, and their orbital radii, ≅12 kpc, are comparable, while the inclinations of their orbital planes are -95° for M32 and 122° for NGC 205, with respect to the plane of M31.

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