How long to image the Helix Nebula with the Vaonis Vespera Pro
From a Bortle 6 suburban sky, the Vaonis Vespera Pro needs about 7 h 14 min (2,604 subs of 10 s) for a solid image of the Helix Nebula. A quick look takes 1 h 48 min; a showpiece 29 h. Under a Bortle 3 rural sky the solid figure drops to 2 h 57 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 26% 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 | 38 min229 subs | 2 h 32 min914 subs | 10 h3,653 subs |
| Bortle 2Typical dark site | 40 min242 subs | 2 h 41 min965 subs | 11 h3,860 subs |
| Bortle 3Rural | 44 min266 subs | 2 h 57 min1,064 subs | 12 h4,253 subs |
| Bortle 4Rural / suburban transition | 54 min326 subs | 3 h 37 min1,302 subs | 14 h5,205 subs |
| Bortle 5Suburban | 1 h 10 min420 subs | 4 h 40 min1,679 subs | 19 h6,713 subs |
| Bortle 6Bright suburban | 1 h 48 min651 subs | 7 h 14 min2,604 subs | 29 h10,413 subs |
| Bortle 7Suburban / urban transition | 3 h 02 min1,092 subs | 12 h4,366 subs | 49 h17,463 subs |
| Bortle 8City | 4 h 56 min1,776 subs | 20 h7,103 subs | 79 h28,409 subs |
| Bortle 9Inner city | 8 h 59 min3,235 subs | 36 h12,939 subs | 140+ h51,755 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 9 h 24 min of run time. That is more than one night: over 2 nights, about 4 h 42 min each. The Vespera Pro’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 30WExtends the 11 h battery; 30 W PD per Vaonis.
- 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 Helix Nebula is 25′ × 22′ across. The Vespera Pro frames 1.62° × 1.62° at 1.65″ per pixel, so it fills 26% 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, no EQ mode. Time for a solid image by sub length:
| Sub length | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| 10 s | 2 h 57 min1,064 subs | 4 h 40 min1,679 subs | 12 h4,366 subs |
| 20 s | 2 h 25 min435 subs | 4 h 07 min743 subs | 12 h2,086 subs |
| 30 s | 2 h 14 min269 subs | 3 h 57 min474 subs | 11 h1,370 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| No filter | 2 h 57 min1,064 subs | 4 h 40 min1,679 subs | 12 h4,366 subs |
| dual-band (Dual Band filter), clip-on | 3 h 49 min1,374 subs | 4 h 20 min1,562 subs | 6 h 37 min2,385 subs |
The Vespera Pro has no built-in dual-band filter. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar. On an emission target like this it is the single biggest upgrade you can make.
About the Helix Nebula
The nearest bright planetary nebula, half the Moon's width but spread thin. Low from the UK; dual-band and a couple of hours make the eye appear.
NGC 7293, Caldwell 63 · Planetary nebula in Aquarius · magnitude 7.3 · 25′ × 22′ · best in Aug, Sep, Oct. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Planetary nebulae are small but intensely bright per pixel in OIII and H-alpha, so they respond very well to a dual-band filter and do not need much time for the main shell. The faint outer halos most of them have are a different proposition and need hours. Keep subs short if the central region saturates.
About the Vaonis Vespera Pro
The square-sensor Vespera with 2 µm pixels. Higher resolution than the II, and correspondingly slower per pixel: expect around double the time for the same per-pixel SNR. Run-out in 2026 and replaced by the Vespera Pro 2.
10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only, no EQ mode. 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 Helix Nebula from a Vespera Pro? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- Helix Nebula with the ZWO Seestar S50: 2 h from Bortle 6
- Helix Nebula with the ZWO Seestar S50 Pro: 2 h 15 min from Bortle 6
- Helix Nebula with the ZWO Seestar S30: 2 h 20 min from Bortle 6
- Helix Nebula with the ZWO Seestar S30 Pro: 2 h 25 min from Bortle 6
- Helix Nebula with the DwarfLab DWARF 3: 2 h 28 min from Bortle 6
- Helix Nebula with the DwarfLab DWARF mini: 1 h 58 min from Bortle 6
- Helix Nebula with the DwarfLab Draco: 1 h 35 min from Bortle 6
- Helix Nebula with the DwarfLab DWARF II: 11 h from Bortle 6
- Helix Nebula with the Vaonis Vespera II: 3 h 13 min from Bortle 6
- Helix Nebula with the Vaonis Vespera 3: 3 h 05 min from Bortle 6
- Helix Nebula with the Vaonis Vespera Pro 2: 6 h 53 min from Bortle 6
- Helix Nebula with the Unistellar eQuinox 2: 2 h 57 min from Bortle 6
- Helix Nebula with the Unistellar Odyssey: 14 h from Bortle 6
- Helix Nebula with the Celestron Origin: 51 min from Bortle 6
- Helix Nebula with the Celestron Origin Mark II: 1 h 10 min from Bortle 6
All telescopes for the Helix Nebula · All targets for the Vespera Pro