M19
NGC 6273 · Globular cluster in Ophiuchus
- Magnitude
- 6.8
- Size
- 17′
- Effective surface brightness
- 21.3 mag/arcsec²
- Best months
- May, Jun, Jul
- Declination
- -26°
- Filter
- None (broadband target)
The most oblate of the globulars, visibly elongated. Low in the south from mid-northern latitudes.
Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
How long with each smart telescope
| Telescope | In frame | Bortle 3 (rural) | Bortle 5 (suburban) | Bortle 7 (urban edge) |
|---|---|---|---|---|
| ZWO Seestar S5010 s subs | 39% | 9 min57 subs | 14 min85 subs | 35 min208 subs |
| ZWO Seestar S50 Pro10 s subs | 21% | 10 min63 subs | 15 min93 subs | 38 min227 subs |
| ZWO Seestar S3010 s subs | 24% | 10 min63 subs | 15 min91 subs | 36 min214 subs |
| ZWO Seestar S30 Pro10 s subs | 13% | 11 min67 subs | 16 min99 subs | 40 min240 subs |
| DwarfLab DWARF 315 s subs | 17% | 13 min51 subs | 20 min81 subs | 52 min208 subs |
| DwarfLab DWARF mini15 s subs | 24% | 9 min38 subs | 14 min57 subs | 35 min139 subs |
| DwarfLab Draco30 s subs | 23% | 15 min30 subs | 15 min30 subs | 29 min58 subs |
| DwarfLab DWARF II15 s subs | 16% | 38 min154 subs | 52 min207 subs | 1 h 49 min435 subs |
| Vaonis Vespera II10 s subs | 20% | 9 min57 subs | 14 min85 subs | 35 min208 subs |
| Vaonis Vespera Pro10 s subs | 17% | 22 min135 subs | 32 min194 subs | 1 h 15 min453 subs |
| Vaonis Vespera 310 s subs | 19% | 9 min54 subs | 13 min81 subs | 33 min200 subs |
| Vaonis Vespera Pro 210 s subs | 17% | 21 min128 subs | 31 min185 subs | 1 h 12 min434 subs |
| Unistellar eQuinox 24 s subs | 50% | 11 min170 subs | 14 min214 subs | 27 min406 subs |
| Unistellar Odyssey4 s subs | 51% | 58 min876 subs | 1 h 09 min1,036 subs | 1 h 56 min1,735 subs |
| Celestron Origin10 s subs | 33% | 5 min30 subs | 5 min30 subs | 9 min57 subs |
| Celestron Origin Mark II10 s subs | 38% | 5 min30 subs | 5 min30 subs | 13 min80 subs |
Imaging the globular cluster
Globular clusters are point sources packed tight, so they come quickly: the core resolves into stars within a handful of minutes on any smart scope. More time deepens the halo and pulls in the faint outer members. Use short subs so the core does not saturate into a white blob, and no filter.
Per-telescope pages
- How long to image the M19 with the ZWO Seestar S50
- How long to image the M19 with the ZWO Seestar S50 Pro
- How long to image the M19 with the ZWO Seestar S30
- How long to image the M19 with the ZWO Seestar S30 Pro
- How long to image the M19 with the DwarfLab DWARF 3
- How long to image the M19 with the DwarfLab DWARF mini
- How long to image the M19 with the DwarfLab Draco
- How long to image the M19 with the DwarfLab DWARF II
- How long to image the M19 with the Vaonis Vespera II
- How long to image the M19 with the Vaonis Vespera Pro
- How long to image the M19 with the Vaonis Vespera 3
- How long to image the M19 with the Vaonis Vespera Pro 2
- How long to image the M19 with the Unistellar eQuinox 2
- How long to image the M19 with the Unistellar Odyssey
- How long to image the M19 with the Celestron Origin
- How long to image the M19 with the Celestron Origin Mark II