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| Object/type: | the double double / double-double star |
| mag/dia/dist: | 5.06 & 6.02, 5.14 & 5.37 / separation 2.5" & 2.35" / 180 ly |
| constellation: | Lyra |
| date/time/place: | Nov 5, 2000 / 19:30 / bangkok |
| trans'y/seeing/l-poll: | good / good / medium |
| telescope: | newtonian 4.5" f8.8 |
| eyepieces/power: | 6mm / 167x |
| sky atlas page: | |
look for Vega, the double-double (epsilon 1 & 2, E1 & E2) will be in the same FOV
of finder scope, center at E1 & E2 by 100x(10mm-eyepiece) still look like normal double star.
when increase to 167x(6mm-eyepiece) it can be split into double-double
The upper is E1, 2.5" separation; the lower is E2, 2.35" separation. The main spearation
E1-E2 is 208" (about 3.5')
by burnham "this is the most famous example of a multiple star in the sky"
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