How long to image the M110 with the Vaonis Vespera Pro 2
From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 8 h 04 min (2,905 subs of 10 s) for a solid image of the M110. A quick look takes 2 h 01 min; a showpiece 32 h. Under a Bortle 3 rural sky the solid figure drops to 3 h 14 min. At Bortle 6 the limit is skyglow, so a darker site or a filter helps more than longer subs. In this scope's field it fills 22% 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 | 41 min249 subs | 2 h 46 min996 subs | 11 h3,982 subs |
| Bortle 2Typical dark site | 44 min264 subs | 2 h 56 min1,055 subs | 12 h4,217 subs |
| Bortle 3Rural | 49 min292 subs | 3 h 14 min1,166 subs | 13 h4,661 subs |
| Bortle 4Rural / suburban transition | 1 h359 subs | 3 h 59 min1,434 subs | 16 h5,735 subs |
| Bortle 5Suburban | 1 h 17 min465 subs | 5 h 10 min1,860 subs | 21 h7,438 subs |
| Bortle 6Bright suburban | 2 h 01 min727 subs | 8 h 04 min2,905 subs | 32 h11,617 subs |
| Bortle 7Suburban / urban transition | 3 h 24 min1,224 subs | 14 h4,895 subs | 54 h19,580 subs |
| Bortle 8City | 5 h 33 min1,997 subs | 22 h7,986 subs | 89 h31,944 subs |
| Bortle 9Inner city | 10 h3,645 subs | 40 h14,578 subs | 160+ h58,311 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 10 h of run time. That is more than one night: over 2 nights, about 5 h 15 min each. The Vespera Pro 2’s battery (rated about 11 h) should cover each night; a power bank still keeps the phone running the app alive. (Bortle 6, solid image; we allow 30% over the integration time.)
- USB-C PD power bank 20000mAh 30WExternal bank extends the 11 h battery.
- 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 Vespera Pro 2 →
How it frames
The M110 is 22′ × 11′ across. The Vespera Pro 2 frames 1.65° × 1.65° at 1.68″ per pixel, so it fills 22% of the frame’s short side.
Longer subs
10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only; CovalENS mosaic gives 3.2° × 3.2° at 50 MP. Time for a solid image by sub length:
| Sub length | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| 10 s | 3 h 14 min1,166 subs | 5 h 10 min1,860 subs | 14 h4,895 subs |
| 20 s | 2 h 39 min478 subs | 4 h 35 min825 subs | 13 h2,343 subs |
| 30 s | 2 h 27 min295 subs | 4 h 23 min527 subs | 13 h1,539 subs |
About the M110
Andromeda's larger, diffuse elliptical companion. Low surface brightness; it fades into the background in short stacks.
NGC 205 · Galaxy in Andromeda · magnitude 8.1 · 22′ × 11′ · best in Sep, Oct, Nov. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Galaxies are broadband targets: their light is mostly starlight spread across the spectrum, so a dual-band filter throws most of it away and makes things slower, not faster. Shoot without a filter (or with a plain UV/IR cut) and rely on total time and a dark sky. The core of a galaxy is usually many times brighter than its outer disc, so a short stack shows the nucleus long before the arms; the figures here are for the arms and disc, not the core.
Field rotation in Alt-Az mode crops the edges of the stack over a long session, so on a big galaxy re-centre now and then or use EQ mode where your scope supports it.
About the Vaonis Vespera Pro 2
The square-sensor 2026 Vespera with 2 µm pixels. Sharper than the Vespera 3 on small targets and correspondingly slower per pixel; the 12.5 MP square frame suits galaxies and planetaries.
10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only; CovalENS mosaic gives 3.2° × 3.2° at 50 MP. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar.
Longer subs matter most under dark skies, where read noise rather than skyglow sets the floor. From a city the difference between 10 s and 30 s subs is small; from a rural site it can halve the total time, especially with a dual-band filter in place.
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 M110 from a Vespera Pro 2? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- M110 with the ZWO Seestar S50: 3 h 46 min from Bortle 6
- M110 with the ZWO Seestar S50 Pro: 4 h 08 min from Bortle 6
- M110 with the ZWO Seestar S30: 3 h 58 min from Bortle 6
- M110 with the ZWO Seestar S30 Pro: 4 h 23 min from Bortle 6
- M110 with the DwarfLab DWARF 3: 5 h 28 min from Bortle 6
- M110 with the DwarfLab DWARF mini: 3 h 45 min from Bortle 6
- M110 with the DwarfLab Draco: 3 h 06 min from Bortle 6
- M110 with the DwarfLab DWARF II: 13 h from Bortle 6
- M110 with the Vaonis Vespera II: 3 h 46 min from Bortle 6
- M110 with the Vaonis Vespera Pro: 8 h 28 min from Bortle 6
- M110 with the Vaonis Vespera 3: 3 h 36 min from Bortle 6
- M110 with the Unistellar eQuinox 2: 3 h 28 min from Bortle 6
- M110 with the Unistellar Odyssey: 16 h from Bortle 6
- M110 with the Celestron Origin: 1 h from Bortle 6
- M110 with the Celestron Origin Mark II: 1 h 22 min from Bortle 6
All telescopes for the M110 · All targets for the Vespera Pro 2