**Table 1:** Galaxy parameters.
	M 51
Type^a	SA(s)bcp
Radio Center :
RA (B1950)^b	13 $^{\rm h}$ 27 $^{\rm m}$ 46.3 $^{\rm s}$
Decl (B1950)^b	+47 $^{\circ }$ 27'10''
RA (J2000)^b	13 $^{\rm h}$ 29 $^{\rm m}$ 52.7 $^{s\rm }$
Decl (J2000)^b	+47 $^{\circ }$ 11'42''
$V_{\rm LSR}^{c,}$	+464 $~{\rm {km~s^{-1}}}$
Inclination i^c	20 $^{\circ }$
Position angle P^c	170 $^{\circ }$
Distance D^d	9.7 Mpc
Scale	21.3''/kpc

Notes: ^a RSA (Sandage & Tammann 1987);
            ^b Turner & Ho (1994);
            ^c Tully (1974);
            ^d Sandage & Tamann (1975).

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