| NGC 3689 | |
| Constellation Name: | Leo |
| Epoch: | J2000 |
| Type: | SAB(rs)c[1] |
| Dist Ly: | NaNMpc |
| Z: | 0.009130 |
| H Radial V: | 2737 ± 1 km/s |
| Appmag V: | 12.3 |
| Size V: | 1.7' x 1.1' |
| Size: | ~21.2kpc (estimated) |
NGC 3689 is an intermediate spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 3049 ± 22 km/s, which corresponds to a Hubble distance of 44.97 ± 3.16 Mpc (∼147 million light-years). However, 16 non-redshift measurements give a distance of 39.350 ± 2.088 Mpc (∼128 million light-years). The galaxy was discovered by German-British astronomer William Herschel on 6 April 1785.[2]
According to the SIMBAD database, NGC 3689 is a radio galaxy.[3]
The SAGA Astronomical Survey for the search for satellite galaxies orbiting another galaxy confirmed the presence of two satellite galaxies for NGC 3689.[4]
One calcium-rich supernova has been observed in NGC 3689: AT 2024mxe (type Gap, mag. 17.7).[5]