How long to image the M80 with the Unistellar eQuinox 2
From a Bortle 6 suburban sky, the Unistellar eQuinox 2 needs about 9 min (139 subs of 4 s) for a solid image of the M80. A quick look takes 2 min; a showpiece 37 min. Under a Bortle 3 rural sky the solid figure drops to 6 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 29% of the frame’s short side.
| Sky | Quick lookTarget obvious, still noisy | SolidClean enough to share | ShowpieceSmooth faint detail, print-worthy |
|---|---|---|---|
| Bortle 1Excellent dark site | 1 min22 subs | 6 min85 subs | 22 min338 subs |
| Bortle 2Typical dark site | 1 min22 subs | 6 min87 subs | 23 min345 subs |
| Bortle 3Rural | 1 min23 subs | 6 min90 subs | 24 min357 subs |
| Bortle 4Rural / suburban transition | 2 min25 subs | 6 min97 subs | 26 min388 subs |
| Bortle 5Suburban | 2 min28 subs | 7 min110 subs | 29 min437 subs |
| Bortle 6Bright suburban | 2 min35 subs | 9 min139 subs | 37 min556 subs |
| Bortle 7Suburban / urban transition | 3 min49 subs | 13 min196 subs | 52 min783 subs |
| Bortle 8City | 5 min72 subs | 19 min285 subs | 1 h 16 min1,137 subs |
| Bortle 9Inner city | 8 min119 subs | 31 min473 subs | 2 h 06 min1,890 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 12 min of run time. The eQuinox 2’s battery (rated about 11 h) should cover it; a power bank still keeps the phone running the app alive. (Bortle 6, solid image; we allow 30% over the integration time.)
- USB-C power bank 20000mAh 5V 2AUnistellar asks for a 5 V 2 A output; PD is not needed.
- red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
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Everything that fits the eQuinox 2 →
How it frames
The M80 is 10′ across. The eQuinox 2 frames 0.76° × 0.57° at 1.33″ per pixel, so it fills 29% of the frame’s short side.
About the M80
A dense little globular between Antares and Graffias. Resolves poorly, but the ball itself is bright.
NGC 6093 · Globular cluster in Scorpius · magnitude 7.3 · 10′ · best in May, Jun, Jul. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
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.
About the Unistellar eQuinox 2
A 114 mm Newtonian with five times the light grasp of a 50 mm refractor. Fixed 4 s subs put it in read-noise territory under dark skies, but the aperture carries it. The published field is 45.6′ × 34.2′, a crop of the sensor.
Fixed 4 s subs in Enhanced Vision; they cannot be changed. No built-in filter. Unistellar sells only a solar filter and says a third-party filter is at your own risk and voids the warranty.
The eQuinox 2 uses fixed 4 s subs, so the only levers you have are the sky you shoot from, the filter, and total time.
Stack across nights. Every smart scope app can continue a stack or you can combine the saved frames on a computer; the figures here are totals, not single-session limits.
Have an image of the M80 from a eQuinox 2? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- M80 with the ZWO Seestar S50: 11 min from Bortle 6
- M80 with the ZWO Seestar S50 Pro: 12 min from Bortle 6
- M80 with the ZWO Seestar S30: 11 min from Bortle 6
- M80 with the ZWO Seestar S30 Pro: 13 min from Bortle 6
- M80 with the DwarfLab DWARF 3: 16 min from Bortle 6
- M80 with the DwarfLab DWARF mini: 11 min from Bortle 6
- M80 with the DwarfLab Draco: 15 min from Bortle 6
- M80 with the DwarfLab DWARF II: 36 min from Bortle 6
- M80 with the Vaonis Vespera II: 11 min from Bortle 6
- M80 with the Vaonis Vespera Pro: 24 min from Bortle 6
- M80 with the Vaonis Vespera 3: 10 min from Bortle 6
- M80 with the Vaonis Vespera Pro 2: 23 min from Bortle 6
- M80 with the Unistellar Odyssey: 41 min from Bortle 6
- M80 with the Celestron Origin: 5 min from Bortle 6
- M80 with the Celestron Origin Mark II: 5 min from Bortle 6