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The peak brightness of SN 1937C in IC 4182 and the Hubble constant
The light curve of the Type Ia supernova SN 1937C (in IC 4182) isimportant because Sandage et al. have measured a distance to the hostgalaxy by means of Cepheid variables and thus have derived the Hubbleconstant. However, the peak brightness of SN 1937C has only been derivedwith the relatively poor original comparison star brightnesses andwithout regard to a large body of data in the literature. In this paper,I will correct these and other procedural difficulties. I find that thelate time photographic light curve appears to have a broken exponentialdecay with equivalent half-lives of 46 and 58 days with the break near300 days after maximum. I also find that the peak B-magnitude was 8.71+/- 0.14 on JD 2428770.0 +/- 1.0 at which time the B-V was -0.03 +/-0.13. With these improved peak brightnesses, the distance modulus ofSandage et al., and peak absolute magnitudes in the center of the rangeof modern estimates, I derive the Hubble constant to be 50 km/s Mpc.
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Observation and Astrometry data
| Constellation: | Jagdhunde |
| Right ascension: | 13h04m46.54s |
| Declination: | +37°05'58.3" |
| Apparent magnitude: | 10.539 |
| Proper motion RA: | -26.1 |
| Proper motion Dec: | -43.2 |
| B-T magnitude: | 11.312 |
| V-T magnitude: | 10.603 |
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