**Table 1:** Basic properties of M 51.
	M 51
RA(2000)	13:29:52.7
Dec(2000)	47:11:43
Type	SA(s)bc pec^a
Distance [Mpc]	8.4^b
11'' correspond to	448 pc
Heliocentric velocity [km s^-1]	463^a
Position Angle [deg]	170^c
Inclination [deg]	20^c

References: ^a RC3 catalogue de Vaucouleurs et al. (1991), ^b Feldmeier et al. (1997), note that Takats & Vinko (2006) recently reported a distance of only $7.1\pm1.2$ Mpc, ^c Tully (1974a).

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