How long to image the Horsehead Nebula with the Vaonis Vespera 3
From a Bortle 6 suburban sky, the Vaonis Vespera 3 needs about 3 h 05 min (1,109 subs of 10 s) for a solid image of the Horsehead Nebula. A quick look takes 46 min; a showpiece 12 h. Under a Bortle 3 rural sky the solid figure drops to 1 h 07 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 68% 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 | 14 min85 subs | 56 min337 subs | 3 h 44 min1,346 subs |
| Bortle 2Typical dark site | 15 min91 subs | 1 h361 subs | 4 h1,441 subs |
| Bortle 3Rural | 17 min102 subs | 1 h 07 min405 subs | 4 h 30 min1,620 subs |
| Bortle 4Rural / suburban transition | 21 min129 subs | 1 h 26 min514 subs | 5 h 42 min2,055 subs |
| Bortle 5Suburban | 29 min172 subs | 1 h 54 min686 subs | 7 h 37 min2,744 subs |
| Bortle 6Bright suburban | 46 min278 subs | 3 h 05 min1,109 subs | 12 h4,434 subs |
| Bortle 7Suburban / urban transition | 1 h 20 min479 subs | 5 h 19 min1,914 subs | 21 h7,654 subs |
| Bortle 8City | 2 h 12 min791 subs | 8 h 47 min3,164 subs | 35 h12,654 subs |
| Bortle 9Inner city | 4 h 03 min1,458 subs | 16 h5,830 subs | 65 h23,318 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 4 h of run time. The Vespera 3’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 December night.)
- USB-C PD power bank 20000mAh 30WVaonis says an external bank extends sessions; 30 W PD as for the II and Pro.
- 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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Everything that fits the Vespera 3 →
How it frames
The Horsehead Nebula is 60′ × 10′ across. The Vespera 3 frames 2.60° × 1.46° at 2.44″ per pixel, so it fills 68% 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 widens the field to 4.3° × 2.4°. Time for a solid image by sub length:
| Sub length | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| 10 s | 1 h 07 min405 subs | 1 h 54 min686 subs | 5 h 19 min1,914 subs |
| 20 s | 57 min171 subs | 1 h 44 min312 subs | 5 h 08 min926 subs |
| 30 s | 53 min107 subs | 1 h 40 min201 subs | 5 h 05 min610 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| No filter | 1 h 07 min405 subs | 1 h 54 min686 subs | 5 h 19 min1,914 subs |
| dual-band (Dual Band filter), clip-on | 1 h 17 min463 subs | 1 h 31 min549 subs | 2 h 34 min925 subs |
The Vespera 3 has no built-in dual-band filter. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar. The new optical baffle is not a substitute for a CLS filter. On an emission target like this it is the single biggest upgrade you can make.
About the Horsehead Nebula
The horse's head is a dark cloud in front of the glowing IC 434 ribbon. You image the ribbon; the head is what is missing. Dual-band, and expect a few hours from suburbia.
IC 434, Barnard 33 · Emission nebula in Orion · magnitude 7.3 · 60′ × 10′ · best in Nov, Dec, Jan. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Emission nebulae glow in a few narrow lines, mostly hydrogen-alpha (deep red) and doubly ionised oxygen (teal). A dual-band filter passes those lines and blocks most skyglow, which is why it cuts the time needed from a suburban sky so dramatically. Use it. From a genuinely dark site the gain is smaller because there is less skyglow to block, and read noise becomes the limit, which is where longer subs (EQ mode, or Expert Mode on a Vespera) earn their keep.
Stars lose colour through a dual-band filter; a short broadband stack blended in fixes that if you care.
About the Vaonis Vespera 3
The 2026 Vespera: same 50 mm quadruplet class as the II on an 8 MP IMX585, with a 24 MP mosaic mode and 11 hours of battery. Per pixel it behaves like a Seestar S50 Pro without the built-in dual-band filter.
10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only; CovalENS mosaic widens the field to 4.3° × 2.4°. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar. The new optical baffle is not a substitute for a CLS filter.
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 Horsehead Nebula from a Vespera 3? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- Horsehead Nebula with the ZWO Seestar S50: 2 h from Bortle 6
- Horsehead Nebula with the ZWO Seestar S50 Pro: 2 h 15 min from Bortle 6
- Horsehead Nebula with the ZWO Seestar S30: 2 h 20 min from Bortle 6
- Horsehead Nebula with the ZWO Seestar S30 Pro: 2 h 25 min from Bortle 6
- Horsehead Nebula with the DwarfLab DWARF 3: 2 h 28 min from Bortle 6
- Horsehead Nebula with the DwarfLab DWARF mini: 1 h 58 min from Bortle 6
- Horsehead Nebula with the DwarfLab Draco: 1 h 35 min from Bortle 6
- Horsehead Nebula with the DwarfLab DWARF II: 11 h from Bortle 6
- Horsehead Nebula with the Vaonis Vespera II: 3 h 13 min from Bortle 6
- Horsehead Nebula with the Vaonis Vespera Pro: 7 h 14 min from Bortle 6
- Horsehead Nebula with the Vaonis Vespera Pro 2: 6 h 53 min from Bortle 6
- Horsehead Nebula with the Unistellar eQuinox 2: 2 h 57 min from Bortle 6
- Horsehead Nebula with the Unistellar Odyssey: 14 h from Bortle 6
- Horsehead Nebula with the Celestron Origin: 51 min from Bortle 6
- Horsehead Nebula with the Celestron Origin Mark II: 1 h 10 min from Bortle 6
All telescopes for the Horsehead Nebula · All targets for the Vespera 3