M30
NGC 7099 · Globular cluster in Capricornus
- Magnitude
- 7.2
- Size
- 11′
- Effective surface brightness
- 20.8 mag/arcsec²
- Best months
- Jul, Aug, Sep
- Declination
- -23°
- Filter
- None (broadband target)
A core-collapsed globular in Capricornus with a couple of bright star chains. Low but doable from the north.
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 | 26% | 6 min36 subs | 8 min50 subs | 18 min111 subs |
| ZWO Seestar S50 Pro10 s subs | 13% | 6 min39 subs | 9 min55 subs | 20 min121 subs |
| ZWO Seestar S3010 s subs | 15% | 6 min39 subs | 9 min53 subs | 19 min114 subs |
| ZWO Seestar S30 Pro10 s subs | 8% | 7 min42 subs | 10 min58 subs | 21 min128 subs |
| DwarfLab DWARF 315 s subs | 11% | 8 min33 subs | 12 min48 subs | 28 min111 subs |
| DwarfLab DWARF mini15 s subs | 15% | 8 min30 subs | 8 min33 subs | 18 min74 subs |
| DwarfLab Draco30 s subs | 15% | 15 min30 subs | 15 min30 subs | 15 min31 subs |
| DwarfLab DWARF II15 s subs | 10% | 23 min91 subs | 29 min117 subs | 58 min231 subs |
| Vaonis Vespera II10 s subs | 13% | 6 min36 subs | 8 min50 subs | 18 min111 subs |
| Vaonis Vespera Pro10 s subs | 11% | 14 min82 subs | 19 min112 subs | 40 min242 subs |
| Vaonis Vespera 310 s subs | 13% | 6 min34 subs | 8 min48 subs | 18 min107 subs |
| Vaonis Vespera Pro 210 s subs | 11% | 13 min78 subs | 18 min107 subs | 38 min231 subs |
| Unistellar eQuinox 24 s subs | 32% | 6 min96 subs | 8 min118 subs | 14 min214 subs |
| Unistellar Odyssey4 s subs | 33% | 32 min478 subs | 37 min558 subs | 1 h907 subs |
| Celestron Origin10 s subs | 21% | 5 min30 subs | 5 min30 subs | 5 min31 subs |
| Celestron Origin Mark II10 s subs | 25% | 5 min30 subs | 5 min30 subs | 7 min43 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 M30 with the ZWO Seestar S50
- How long to image the M30 with the ZWO Seestar S50 Pro
- How long to image the M30 with the ZWO Seestar S30
- How long to image the M30 with the ZWO Seestar S30 Pro
- How long to image the M30 with the DwarfLab DWARF 3
- How long to image the M30 with the DwarfLab DWARF mini
- How long to image the M30 with the DwarfLab Draco
- How long to image the M30 with the DwarfLab DWARF II
- How long to image the M30 with the Vaonis Vespera II
- How long to image the M30 with the Vaonis Vespera Pro
- How long to image the M30 with the Vaonis Vespera 3
- How long to image the M30 with the Vaonis Vespera Pro 2
- How long to image the M30 with the Unistellar eQuinox 2
- How long to image the M30 with the Unistellar Odyssey
- How long to image the M30 with the Celestron Origin
- How long to image the M30 with the Celestron Origin Mark II