How long to image the Sculptor Galaxy with the Vaonis Vespera Pro 2
From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 1 h 02 min (373 subs of 10 s) for a solid image of the Sculptor Galaxy. A quick look takes 16 min; a showpiece 4 h 08 min. Under a Bortle 3 rural sky the solid figure drops to 28 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 27% 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 | 6 min38 subs | 25 min151 subs | 1 h 40 min602 subs |
| Bortle 2Typical dark site | 7 min40 subs | 26 min158 subs | 1 h 45 min629 subs |
| Bortle 3Rural | 7 min43 subs | 28 min170 subs | 1 h 53 min680 subs |
| Bortle 4Rural / suburban transition | 8 min51 subs | 34 min202 subs | 2 h 14 min805 subs |
| Bortle 5Suburban | 10 min63 subs | 42 min251 subs | 2 h 47 min1,003 subs |
| Bortle 6Bright suburban | 16 min94 subs | 1 h 02 min373 subs | 4 h 08 min1,489 subs |
| Bortle 7Suburban / urban transition | 25 min151 subs | 1 h 41 min604 subs | 6 h 42 min2,414 subs |
| Bortle 8City | 40 min241 subs | 2 h 40 min963 subs | 11 h3,851 subs |
| Bortle 9Inner city | 1 h 12 min433 subs | 4 h 48 min1,729 subs | 19 h6,916 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 1 h 21 min of run time. The Vespera Pro 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 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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How it frames
The Sculptor Galaxy is 27′ × 7′ across. The Vespera Pro 2 frames 1.65° × 1.65° at 1.68″ per pixel, so it fills 27% 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 | 28 min170 subs | 42 min251 subs | 1 h 41 min604 subs |
| 20 s | 24 min73 subs | 38 min114 subs | 1 h 37 min290 subs |
| 30 s | 23 min46 subs | 36 min73 subs | 1 h 35 min191 subs |
About the Sculptor Galaxy
A big, dusty, nearly edge-on starburst galaxy, superb from the south and low but possible from mid-northern latitudes.
NGC 253, Caldwell 65, Silver Coin · Galaxy in Sculptor · magnitude 7.2 · 27′ × 7′ · 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 Sculptor Galaxy 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
- Sculptor Galaxy with the ZWO Seestar S50: 29 min from Bortle 6
- Sculptor Galaxy with the ZWO Seestar S50 Pro: 32 min from Bortle 6
- Sculptor Galaxy with the ZWO Seestar S30: 31 min from Bortle 6
- Sculptor Galaxy with the ZWO Seestar S30 Pro: 34 min from Bortle 6
- Sculptor Galaxy with the DwarfLab DWARF 3: 43 min from Bortle 6
- Sculptor Galaxy with the DwarfLab DWARF mini: 29 min from Bortle 6
- Sculptor Galaxy with the DwarfLab Draco: 24 min from Bortle 6
- Sculptor Galaxy with the DwarfLab DWARF II: 1 h 39 min from Bortle 6
- Sculptor Galaxy with the Vaonis Vespera II: 29 min from Bortle 6
- Sculptor Galaxy with the Vaonis Vespera Pro: 1 h 05 min from Bortle 6
- Sculptor Galaxy with the Vaonis Vespera 3: 28 min from Bortle 6
- Sculptor Galaxy with the Unistellar eQuinox 2: 26 min from Bortle 6
- Sculptor Galaxy with the Unistellar Odyssey: 1 h 59 min from Bortle 6
- Sculptor Galaxy with the Celestron Origin: 8 min from Bortle 6
- Sculptor Galaxy with the Celestron Origin Mark II: 11 min from Bortle 6
All telescopes for the Sculptor Galaxy · All targets for the Vespera Pro 2