61 Cygni is a binary star system 11.4 light-years away in the constellation Cygnus. In 1838, it became the first star to have its distance measured through stellar parallax.
61 Cygni is 11.41 light-years from Earth. That is about 108 trillion km (67.1 trillion miles), or 721,600 astronomical units.
| Unit | Distance |
|---|---|
| Light-years | 11.41 |
| Kilometers | 108,000,000,000,000 km |
| Miles | 67,100,000,000,000 miles |
| Astronomical units (AU) | 722,000 astronomical units |
| Parsecs | 3.5 |
Light from 61 Cygni takes 11.41 years to reach Earth, so the light you see tonight left 61 Cygni 11.41 years ago.
Voyager 1, the fastest object humans have sent into deep space, travels at about 17 km/s. It would need about 201,200 years to cover this distance.
Notable For: First star to have its distance measured via parallax
At light speed, it would take 11.4 years to reach 61 Cygni. At 1g constant acceleration with deceleration, a traveler would experience about 7 years.
61 Cygni was the first star to have its distance measured using parallax in 1838 by Friedrich Bessel. This measurement proved that stars are incredibly far away.
61 Cygni is 11.41 light-years from Earth, which is about 108 trillion km or 67.1 trillion miles. Light from 61 Cygni takes 11.41 years to reach us.
61 Cygni is 11.41 light-years from Earth. One light-year is about 9.46 trillion km, the distance light travels in one year. In parsecs, 61 Cygni is about 3.5 parsecs away.
This time dilation calculator lets you enter a distance in light-years and acceleration in m/s² to see how time dilation affects your journey. It shows differences between traveler and observer times, maximum velocity, energy requirements, Doppler shift, Lorentz factor, and how distances vary between reference frames. Charts appear after you calculate.
Time dilation is an effect from Einstein's theory of special relativity. The faster you move, the slower time passes for you compared to someone standing still. At 90% of light speed, time passes about 2.3 times slower for the traveler than for someone on Earth.
The Time Dilation Formula is:
Where:
t' = time measured by the observer (on Earth)
t = time experienced by the traveler
v = velocity of the traveler
c = speed of light (299,792,458 meters per second)