Comoving Distance Calculator — 公式
## Comoving Distance Approximation
At low redshifts the comoving distance is well approximated by the linear Hubble relation.
### Formula
**d = c z / H0**
- *c* = 299 800 km/s (speed of light)
- *z* = observed redshift
- *H0* = Hubble constant
The result is in Mpc. For z above about 0.3, higher-order corrections become important.
At low redshifts the comoving distance is well approximated by the linear Hubble relation.
### Formula
**d = c z / H0**
- *c* = 299 800 km/s (speed of light)
- *z* = observed redshift
- *H0* = Hubble constant
The result is in Mpc. For z above about 0.3, higher-order corrections become important.
计算示例
A galaxy at redshift z = 0.1 with H0 = 70 km/s/Mpc.
- d = c z / H0
- d = 299800 * 0.1 / 70
- d = 29980 / 70
- d ≈ 428.3 Mpc ≈ 1396 Mly