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Table 1
Distance to M51. Literature values.
| Distance | Method | Reference |
| (Mpc) | ||
|
|
||
| 9.60 ± 0.80 | Size of HII regions | Sandage & Tammann (1974) |
| 6.91 ± 0.67 | Young stellar clusters | Georgiev et al. (1990) |
| 8.39 ± 0.60 | Planetary nebula luminosity function | Feldmeier et al. (1997) |
| 7.62 ± 0.60 | Planetary nebula luminosity function | Ciardullo et al. (2002) |
| 7.66 ± 1.01 | Surface brightness fluctuations | Tonry et al. (2001) |
| 7.59 ± 1.02 | Expanding photosphere method (SN 2005cs) | Takáts & Vinkó (2006) |
| 6.36 ± 1.30 | Type IIP SN standard candle method (SN 2005cs) | Takáts & Vinkó (2006) |
| 8.90 ± 0.50 | Spectral expanding photosphere method (SN 2005cs) | Dessart et al. (2008) |
| 6.92 | Type Ic SN properties (SN 1994I) | Iwamoto et al. (1994) |
| 7.90 ± 0.70 | Spectral expanding photosphere method (SN 2005cs) | Baron et al. (2007) |
| 6.02 ± 1.92 | Spectral expanding photosphere method (SN 1994I) | Baron et al. (1996) |
| 8.36 | Type IIP SN standard candle method (SN 2005cs) | Poznanski et al. (2009) |
| 9.30 | Tully-Fisher relation | Tully (1988) |
| 8.40 ± 0.7 | Expanding photosphere method (SNe 2005cs and 2011dh) | Vinkó et al. (2012) |
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