Redshift to shift of the hydrogen line
Type a value in z to get it in nm shift instantly.
That's 4.3× as distant as the Coma cluster, while the nearest quasar is 1.58× further. Light from it arrives about 10% longer in wavelength.
What it means
How far is that?
Distances use a simple Hubble law at 70 km/s per Mpc, which is only a good guide for small z. Beyond about z = 0.1 the real answer depends on the expansion history.
The math
How to convert z to nm shift
Redshift is a stretch: 1 + z = observed ÷ emitted wavelength. Speed follows relativistically, v = c × ((1+z)² − 1) ÷ ((1+z)² + 1), and distance from v ÷ H₀ at 70 km/s per Mpc.
Example: 0.1 z = 65.628 nm shift.
Every unit
Your redshift in every unit
Tables
z to nm shift conversion table
| z | nm shift |
|---|---|
| 0.001 z | 0.65628 nm shift |
| 0.01 z | 6.5628 nm shift |
| 0.05 z | 32.814 nm shift |
| 0.1 z | 65.628 nm shift |
| 0.5 z | 328.14 nm shift |
| 1 z | 656.28 nm shift |
| 2 z | 1,312.56 nm shift |
| 3 z | 1,968.84 nm shift |
| 5 z | 3,281.4 nm shift |
| 7 z | 4,593.96 nm shift |
| 11 z | 7,219.08 nm shift |
nm shift to z conversion table
| nm shift | z |
|---|---|
| 0.001 nm shift | 1.524×10⁻⁶ z |
| 0.01 nm shift | 1.524×10⁻⁵ z |
| 0.05 nm shift | 7.619×10⁻⁵ z |
| 0.1 nm shift | 0.000152374 z |
| 0.5 nm shift | 0.00076187 z |
| 1 nm shift | 0.00152374 z |
| 2 nm shift | 0.00304748 z |
| 3 nm shift | 0.00457122 z |
| 5 nm shift | 0.0076187 z |
| 7 nm shift | 0.0106662 z |
| 11 nm shift | 0.0167611 z |
Quick answers
Quick answers
- How many nm shift is 1 z?
- 1 z is 656.28 nm shift.
- How many nm shift is 10 z?
- 10 z is 6,562.8 nm shift.
- How many nm shift is 0.1 z?
- 0.1 z is 65.628 nm shift.
The units
About these units
Redshift (z)
The fractional stretch in wavelength, the number astronomers actually publish.
Shift of the hydrogen line (nm shift)
How far the 656.28 nm hydrogen-alpha line moves towards the red.
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