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Table 1.
Basic properties of NGC 5457 (M 101).
| Morphological type | SABc |
| Inclination (a) | 30° |
| Diameter D25 | 24′ |
| RA2000 | 14h03m13s |
| Dec2000 | +54°20′57″ |
| Distance (b) | 7.4 Mpc |
| Column density NH(c) | 8.58 × 1020 cm−2 |
Notes. All data except inclination, distance, and column density are taken from the HYPERLEDA database – http://leda.univ-lyon1.fr – see Makarov et al. (2014).
(c)
Weighted average value from HI4PI Collaboration (2016).
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