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The apparent $ V $ band distance modulus of NGC 5253, parent
galaxy to the type Ia supernovae 1972E and 1895B, is
$ (m -M)_{AV} = 28.06 \pm 0.06 $ mag determined from eleven Cepheid variables
with unambiguous periods obtained with the Hubble Space Telescope
. The
internal reddening is zero to within $ E(B - V) < 0.03 $ mag,
determined from four independent methods.
\par
The absolute magnitudes of SN Ia 1972E are
$ M_{B}(max) = -19.53 \pm 0.12 $, and $M_V(max) = -19.46 \pm 0.12$.
The absolute magnitude of SN Ia 1895B is
$ M_{B}(max) = -19.69 \pm 0.21 $, based on $ B(max) = 8.4 \pm 0.2 $
determined by correcting Walker's (1923) comparison stars to the
modern photoelectric zero point in $B$.
\par
Combining these data with the data for SN 1937C in IC 4182
determined earlier gives mean values of $
The quoted error is the external
uncertainty assuming an
intrinsic dispersion of 0.3 mag about the Hubble diagram for SN
Ia.
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Subject headings:
Cepheids - distance scale - Galaxies:individual:
NGC 5253 - Supernovae: individual:1895B, 1972E