How long to image the Bode's Galaxy with the Vaonis Vespera Pro 2
From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 2 h 16 min (816 subs of 10 s) for a solid image of the Bode's Galaxy. A quick look takes 34 min; a showpiece 9 h 04 min. Under a Bortle 3 rural sky the solid figure drops to 58 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 | 13 min77 subs | 51 min305 subs | 3 h 23 min1,219 subs |
| Bortle 2Typical dark site | 13 min81 subs | 53 min321 subs | 3 h 34 min1,282 subs |
| Bortle 3Rural | 15 min88 subs | 58 min351 subs | 3 h 53 min1,401 subs |
| Bortle 4Rural / suburban transition | 18 min106 subs | 1 h 10 min422 subs | 4 h 41 min1,688 subs |
| Bortle 5Suburban | 22 min134 subs | 1 h 29 min536 subs | 5 h 57 min2,144 subs |
| Bortle 6Bright suburban | 34 min204 subs | 2 h 16 min816 subs | 9 h 04 min3,262 subs |
| Bortle 7Suburban / urban transition | 56 min337 subs | 3 h 45 min1,348 subs | 15 h5,392 subs |
| Bortle 8City | 1 h 31 min544 subs | 6 h 02 min2,175 subs | 24 h8,699 subs |
| Bortle 9Inner city | 2 h 44 min985 subs | 11 h3,939 subs | 44 h15,753 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 2 h 57 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, and 30% off the battery for a February night.)
- 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.
- hand warmers long lastingAir-activated packs give hours of heat for the person; winter nights are long and you spend most of them standing still.
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How it frames
The Bode's Galaxy is 27′ × 14′ 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 | 58 min351 subs | 1 h 29 min536 subs | 3 h 45 min1,348 subs |
| 20 s | 49 min147 subs | 1 h 20 min240 subs | 3 h 35 min646 subs |
| 30 s | 46 min92 subs | 1 h 17 min154 subs | 3 h 32 min425 subs |
About the Bode's Galaxy
A big, bright grand-design spiral that circles the pole for northern imagers, so it is available all year. Shares a frame with M82.
M81, NGC 3031 · Galaxy in Ursa Major · magnitude 6.9 · 27′ × 14′ · best in Jan, Feb, Mar. 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 Bode's 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
- Bode's Galaxy with the ZWO Seestar S50: 1 h 04 min from Bortle 6
- Bode's Galaxy with the ZWO Seestar S50 Pro: 1 h 10 min from Bortle 6
- Bode's Galaxy with the ZWO Seestar S30: 1 h 07 min from Bortle 6
- Bode's Galaxy with the ZWO Seestar S30 Pro: 1 h 14 min from Bortle 6
- Bode's Galaxy with the DwarfLab DWARF 3: 1 h 33 min from Bortle 6
- Bode's Galaxy with the DwarfLab DWARF mini: 1 h 03 min from Bortle 6
- Bode's Galaxy with the DwarfLab Draco: 52 min from Bortle 6
- Bode's Galaxy with the DwarfLab DWARF II: 3 h 37 min from Bortle 6
- Bode's Galaxy with the Vaonis Vespera II: 1 h 04 min from Bortle 6
- Bode's Galaxy with the Vaonis Vespera Pro: 2 h 23 min from Bortle 6
- Bode's Galaxy with the Vaonis Vespera 3: 1 h 01 min from Bortle 6
- Bode's Galaxy with the Unistellar eQuinox 2: 58 min from Bortle 6
- Bode's Galaxy with the Unistellar Odyssey: 4 h 25 min from Bortle 6
- Bode's Galaxy with the Celestron Origin: 17 min from Bortle 6
- Bode's Galaxy with the Celestron Origin Mark II: 23 min from Bortle 6
All telescopes for the Bode's Galaxy · All targets for the Vespera Pro 2