| Equivalences magnitudes absolues H - diamètres moyens d (en km) | ||||||||||
| formule du calcul approximatif des diamètres moyens : log d = C — H/5 | ||||||||||
| avec C = constante variable selon le type physique et H = magnitude absolue | ||||||||||
| Document mis au point par Michel-Alain Combes | ||||||||||
| Magnitude | Type | Types | Type | Type | Type | Type | Types | diamètres | ||
| absolue | E | V et R | S | M | C | C | C et T | standards | ||
| visuelle | 3.30 | 3.40 | 3.50 | 3.55 | 3.70 | 3.80 | 3.90 | constante | ||
| H | ~0.34 | ~0.26 | ~0.15 | ~0.11 | ~0.06 | ~0.04 | ~0.02 | albédo | ||
| 13.0 | 5.0 | 6.3 | 7.9 | 8.9 | 12.6 | 15.8 | 20.0 | |||
| 13.2 | 4.6 | 5.8 | 7.2 | 8.1 | 11.5 | 14.5 | 18.2 | |||
| 13.4 | 4.2 | 5.2 | 6.6 | 7.4 | 10.5 | 13.2 | 16.6 | |||
| 13.6 | 3.8 | 4.8 | 6.0 | 6.8 | 9.5 | 12.0 | 15.1 | |||
| 13.8 | 3.5 | 4.4 | 5.5 | 6.2 | 8.7 | 11.0 | 13.8 | |||
| 14.0 | 3.2 | 4.0 | 5.0 | 5.6 | 7.9 | 10.0 | 12.6 | type S = 5.0 km | ||
| 14.2 | 2.9 | 3.6 | 4.6 | 5.1 | 7.2 | 9.1 | 11.5 | type C = 10.0 km | ||
| 14.4 | 2.6 | 3.3 | 4.2 | 4.7 | 6.6 | 8.3 | 10.5 | |||
| 14.6 | 2.4 | 3.0 | 3.8 | 4.3 | 6.0 | 7.6 | 9.5 | |||
| 14.8 | 2.2 | 2.8 | 3.5 | 3.9 | 5.5 | 6.9 | 8.7 | |||
| 15.0 | 2.0 | 2.5 | 3.2 | 3.5 | 5.0 | 6.3 | 7.9 | |||
| 15.2 | 1.8 | 2.3 | 2.9 | 3.2 | 4.6 | 5.8 | 7.2 | |||
| 15.4 | 1.7 | 2.1 | 2.6 | 3.0 | 4.2 | 5.2 | 6.6 | |||
| 15.6 | 1.5 | 1.9 | 2.4 | 2.7 | 3.8 | 4.8 | 6.0 | |||
| 15.8 | 1.4 | 1.7 | 2.2 | 2.5 | 3.5 | 4.4 | 5.5 | |||
| 16.0 | 1.3 | 1.6 | 2.0 | 2.2 | 3.2 | 4.0 | 5.0 | type S = 2.0 km | ||
| 16.2 | 1.2 | 1.4 | 1.8 | 2.0 | 2.9 | 3.6 | 4.6 | type C = 4.0 km | ||
| 16.4 | 1.1 | 1.3 | 1.7 | 1.9 | 2.6 | 3.3 | 4.2 | |||
| 16.6 | 1.0 | 1.2 | 1.5 | 1.7 | 2.4 | 3.0 | 3.8 | type S = 1.5 km | ||
| 16.8 | 0.9 | 1.1 | 1.4 | 1.5 | 2.2 | 2.8 | 3.5 | type C = 3.0 km | ||
| 17.0 | 0.8 | 1.0 | 1.3 | 1.4 | 2.0 | 2.5 | 3.2 | |||
| 17.2 | 0.7 | 0.9 | 1.1 | 1.3 | 1.8 | 2.3 | 2.9 | |||
| 17.4 | 0.7 | 0.8 | 1.0 | 1.2 | 1.7 | 2.1 | 2.6 | type S = 1.0 km | ||
| 17.6 | 0.6 | 0.8 | 1.0 | 1.1 | 1.5 | 1.9 | 2.4 | type C = 2.0 km | ||
| 17.8 | 0.6 | 0.7 | 0.9 | 1.0 | 1.4 | 1.7 | 2.2 | |||
| 18.0 | 0.5 | 0.6 | 0.8 | 0.9 | 1.3 | 1.6 | 2.0 | type S = 800 m | ||
| 18.2 | 0.5 | 0.6 | 0.7 | 0.8 | 1.1 | 1.4 | 1.8 | type C = 1.6 km | ||
| 18.4 | 0.4 | 0.5 | 0.7 | 0.7 | 1.0 | 1.3 | 1.7 | |||
| 18.6 | 0.4 | 0.5 | 0.6 | 0.7 | 1.0 | 1.2 | 1.5 | |||
| 18.8 | 0.4 | 0.4 | 0.5 | 0.6 | 0.9 | 1.1 | 1.4 | |||
| 19.0 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 | 1.3 | type S = 500 m | ||
| 19.2 | 0.3 | 0.4 | 0.5 | 0.5 | 0.7 | 0.9 | 1.1 | type C = 1.0 km | ||
| 19.4 | 0.3 | 0.3 | 0.4 | 0.5 | 0.7 | 0.8 | 1.0 | |||
| 19.6 | 0.2 | 0.3 | 0.4 | 0.4 | 0.6 | 0.8 | 0.9 | |||
| 19.8 | 0.2 | 0.3 | 0.3 | 0.4 | 0.5 | 0.7 | 0.9 | |||
| 20.0 | 0.2 | 0.3 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | type S = 300 m | ||
| 20.2 | 0.18 | 0.2 | 0.3 | 0.3 | 0.5 | 0.6 | 0.7 | type C = 600 m | ||
| 20.4 | 0.17 | 0.2 | 0.3 | 0.3 | 0.4 | 0.5 | 0.7 | |||
| 20.6 | 0.15 | 0.19 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | |||
| 20.8 | 0.14 | 0.17 | 0.2 | 0.2 | 0.3 | 0.4 | 0.5 | |||
| 21.0 | 0.13 | 0.16 | 0.2 | 0.2 | 0.3 | 0.4 | 0.5 | type S = 200 m | ||
| 21.2 | 0.12 | 0.14 | 0.18 | 0.2 | 0.3 | 0.4 | 0.5 | type C = 400 m | ||
| 21.4 | 0.11 | 0.13 | 0.17 | 0.19 | 0.3 | 0.3 | 0.4 | |||
| 21.6 | 0.10 | 0.12 | 0.15 | 0.17 | 0.2 | 0.3 | 0.4 | |||
| 21.8 | 0.09 | 0.11 | 0.14 | 0.15 | 0.2 | 0.3 | 0.4 | |||
| 22.0 | 0.08 | 0.10 | 0.13 | 0.14 | 0.2 | 0.3 | 0.3 | Limite des PHA | ||
| 22.2 | 0.07 | 0.09 | 0.11 | 0.13 | 0.18 | 0.2 | 0.3 | |||
| 22.4 | 0.07 | 0.08 | 0.10 | 0.12 | 0.17 | 0.2 | 0.3 | type S = 100 m | ||
| 22.6 | 0.06 | 0.08 | 0.10 | 0.11 | 0.15 | 0.19 | 0.2 | type C = 200 m | ||
| 22.8 | 0.06 | 0.07 | 0.09 | 0.10 | 0.14 | 0.17 | 0.2 | |||
| 23.0 | 0.05 | 0.06 | 0.08 | 0.09 | 0.13 | 0.16 | 0.2 | |||
| 23.2 | 0.05 | 0.06 | 0.07 | 0.08 | 0.11 | 0.14 | 0.18 | |||
| 23.4 | 0.04 | 0.05 | 0.07 | 0.07 | 0.10 | 0.13 | 0.17 | |||
| 23.6 | 0.04 | 0.05 | 0.06 | 0.07 | 0.10 | 0.12 | 0.15 | |||
| 23.8 | 0.04 | 0.04 | 0.05 | 0.06 | 0.09 | 0.11 | 0.14 | |||
| 24.0 | 0.03 | 0.04 | 0.05 | 0.06 | 0.08 | 0.10 | 0.13 | type S = 50 m | ||
| 24.2 | 0.03 | 0.04 | 0.05 | 0.05 | 0.07 | 0.09 | 0.11 | type C = 100 m | ||
| 24.4 | 0.03 | 0.03 | 0.04 | 0.05 | 0.07 | 0.08 | 0.10 | |||
| 24.6 | 0.02 | 0.03 | 0.04 | 0.04 | 0.06 | 0.08 | 0.09 | |||
| 24.8 | 0.02 | 0.03 | 0.03 | 0.04 | 0.05 | 0.07 | 0.09 | |||
| 25.0 | 0.02 | 0.03 | 0.03 | 0.04 | 0.05 | 0.06 | 0.08 | type S = 30 m | ||
| 25.2 | 0.018 | 0.02 | 0.03 | 0.03 | 0.05 | 0.06 | 0.07 | type C = 60 m | ||
| 25.4 | 0.017 | 0.02 | 0.03 | 0.03 | 0.04 | 0.05 | 0.07 | |||
| 25.6 | 0.015 | 0.019 | 0.02 | 0.03 | 0.04 | 0.05 | 0.06 | |||
| 25.8 | 0.014 | 0.017 | 0.02 | 0.02 | 0.03 | 0.04 | 0.05 | |||
| 26.0 | 0.013 | 0.016 | 0.02 | 0.02 | 0.03 | 0.04 | 0.05 | type S = 20 m | ||
| 26.2 | 0.012 | 0.014 | 0.018 | 0.02 | 0.03 | 0.04 | 0.05 | type C = 40 m | ||
| 26.4 | 0.011 | 0.013 | 0.017 | 0.019 | 0.03 | 0.03 | 0.04 | |||
| 26.6 | 0.010 | 0.012 | 0.015 | 0.017 | 0.02 | 0.03 | 0.04 | |||
| 26.8 | 0.009 | 0.011 | 0.014 | 0.015 | 0.02 | 0.03 | 0.04 | |||
| 27.0 | 0.008 | 0.010 | 0.013 | 0.014 | 0.02 | 0.03 | 0.03 | |||
| 27.2 | 0.007 | 0.009 | 0.011 | 0.013 | 0.018 | 0.02 | 0.03 | |||
| 27.4 | 0.007 | 0.008 | 0.010 | 0.012 | 0.017 | 0.02 | 0.03 | type S = 10 m | ||
| 27.6 | 0.006 | 0.008 | 0.010 | 0.011 | 0.015 | 0.019 | 0.02 | type C = 20 m | ||
| 27.8 | 0.006 | 0.007 | 0.009 | 0.010 | 0.014 | 0.017 | 0.02 | |||
| 28.0 | 0.005 | 0.006 | 0.008 | 0.009 | 0.013 | 0.016 | 0.02 | |||
| 28.2 | 0.005 | 0.006 | 0.007 | 0.008 | 0.011 | 0.014 | 0.018 | |||
| 28.4 | 0.004 | 0.005 | 0.007 | 0.007 | 0.010 | 0.013 | 0.017 | |||
| 28.6 | 0.004 | 0.005 | 0.006 | 0.007 | 0.010 | 0.012 | 0.015 | |||
| 28.8 | 0.004 | 0.004 | 0.005 | 0.006 | 0.009 | 0.011 | 0.014 | |||
| Type | Types | Type | Type | Type | Type | Types | ||||
| E | V et R | S | M | C | C | C et T | ||||
| Les plus petits NEA connus ont H = 30.0 et un diamètre moyen de l'ordre de 5 mètres | ||||||||||
| Les zones en jaune et bleu clair du haut concernent les diamètres moyens supérieurs à 200 mètres | ||||||||||
| Les zones en vert clair concernent les diamètres moyens compris entre 200 et 20 mètres | ||||||||||
| Les zones en jaune du bas concernent les diamètres moyens inférieurs à 20 mètres | ||||||||||
| On considère que les objets de type C ont un diamètre double de ceux de type S | ||||||||||
| Les NEA avec MOID < 0.050 UA et H < 22.1 sont des PHA (Potentially Hazardous Asteroids) | ||||||||||
| La valeur moyenne (type S) est de 130 mètres, les extrêmes vont de 80 à 300 mètres | ||||||||||
| Tous les diamètres de ce tableau ne sont que des ordres de grandeur bien entendu | ||||||||||