Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Star | Start\nyear | End\nyear | Maximum\nyear | Maximum\nmagnitude | Distance at\nmaximum (LY) | Current\ndistance | Current\nmagnitude |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Epsilon Canis Majoris | ... | -4,460,000 | -4,700,000 | -3.99 | 34 | 430 | 1.50 |
| Beta Canis Majoris | -4,460,000 | -3,700,000 | -4,420,000 | -3.65 | 37 | 500 | 1.99 |
| Canopus (first time) | -3,700,000 | -1,370,000 | -3,110,000 | -1.86 | 177 | 310 | -0.72 |
| Zeta Sagittarii | -1,370,000 | -1,080,000 | -1,200,000 | -2.74 | 8 | 89.1 | 2.60 |
| Zeta Leporis | -1,080,000 | -950,000 | -1,050,000 | -2.05 | 5.3 | 70 | 3.55 |
| Canopus (second time) | -950,000 | -420,000 | -950,000 | -1.09 | 252 | 310 | -0.72 |
| Aldebaran | -420,000 | -210,000 | -320,000 | -1.54 | 21.5 | 65 | 0.85 |
| Capella | -210,000 | -160,000 | -240,000 | -0.82 | 27.9 | 42.2 | 0.08 |
| Canopus (third time) | -160,000 | -90,000 | -160,000 | -0.70 | 302 | 310 | -0.72 |
| Sirius (current) | -90,000 | +210,000 | +60,000 | -1.64 | 7.8 | 8.6 | -1.46 |
| Vega | +210,000 | +480,000 | +290,000 | -0.81 | 17.2 | 25.04 | 0.03 |
| Canopus (fourth time) | +480,000 | +990,000 | +480,000 | -0.40 | 346 | 310 | -0.72 |
| Beta Aurigae | +990,000 | +1,150,000 | +1,190,000 | -0.40 | 28.5 | 82.1 | 1.9 |
| Delta Scuti | +1,150,000 | +1,330,000 | +1,250,000 | -1.84 | 9.2 | 187 | 4.72 |
| Gamma Draconis | +1,330,000 | +2,030,000 | +1,550,000 | -1.39 | 27.7 | 154 | 2.36 |
| Upsilon Librae | +2,030,000 | +2,670,000 | +2,290,000 | -0.46 | 30 | 195 | 3.6 |
| NR Canis Majoris | +2,670,000 | +3,050,000 | +2,870,000 | -0.88 | 14 | 280 | 5.6 |
| Omicron Herculis | +3,050,000 | +3,870,000 | +3,470,000 | -0.63 | 44 | 346 | 3.83 |
| Beta Cygni | +3,870,000 | ... | +4,610,000 | -0.52 | 80 | 390 | 3.18 |
Question:
what is the difference in the nearest current distance and farthest current distance?
Answer:
491.4