Spectra of Planetary Nebulae
| Nebula | M4-9 | RA (J2000) | 18 14 18.4 |
| Constellation | Serpens | Dec | -04 59 22.1 |
| Size (arcsec) | 20 | Other names | PK 024+05.1 |
| Mag (V) | n/a | Sa 3-125 | |
| Surface Brightness (mag/arcsec2) | n/a |
HAG 24" RC, SBIG STF-8300M, LHires II, 300gr/mm, 1800 sec, 2021-08-28@22:50
Very faint ring DSS2 image, 10 arcmin square
62 / 187 (pg 120)