How long to image the Soul Nebula with the Vaonis Vespera II
From a Bortle 6 suburban sky, the Vaonis Vespera II needs about 5 h 31 min (1,988 subs of 10 s) for a solid image of the Soul Nebula. A quick look takes 1 h 23 min; a showpiece 22 h. Under a Bortle 3 rural sky the solid figure drops to 1 h 59 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 70% 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 | 25 min148 subs | 1 h 38 min591 subs | 6 h 34 min2,362 subs |
| Bortle 2Typical dark site | 26 min159 subs | 1 h 46 min634 subs | 7 h 02 min2,534 subs |
| Bortle 3Rural | 30 min179 subs | 1 h 59 min715 subs | 7 h 56 min2,858 subs |
| Bortle 4Rural / suburban transition | 38 min228 subs | 2 h 32 min912 subs | 10 h3,645 subs |
| Bortle 5Suburban | 51 min306 subs | 3 h 24 min1,223 subs | 14 h4,891 subs |
| Bortle 6Bright suburban | 1 h 23 min497 subs | 5 h 31 min1,988 subs | 22 h7,949 subs |
| Bortle 7Suburban / urban transition | 2 h 24 min862 subs | 9 h 34 min3,445 subs | 38 h13,777 subs |
| Bortle 8City | 3 h 58 min1,427 subs | 16 h5,706 subs | 63 h22,824 subs |
| Bortle 9Inner city | 7 h 19 min2,633 subs | 29 h10,530 subs | 120+ h42,120 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 7 h 11 min of run time. That is more than one night: over 2 nights, about 3 h 35 min each. The Vespera II’s battery is rated at about 4 h, less near freezing, so each night needs an external power bank. (Bortle 6, solid image; we allow 30% over the integration time, and 30% off the battery for a November night.)
- USB-C PD power bank 20000mAh 30WOnly four hours inside; Vaonis specifies a 30 W PD source. C-to-C cable not included.
- Vaonis Vespera hygrometer sensorTriggers the built-in demister automatically; the correct dew accessory for the II.
- 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 II →
How it frames
The Soul Nebula is 60′ × 30′ across. The Vespera II frames 2.55° × 1.44° at 2.39″ per pixel, so it fills 70% 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 | 1 h 59 min715 subs | 3 h 24 min1,223 subs | 9 h 34 min3,445 subs |
| 20 s | 1 h 39 min298 subs | 3 h 04 min552 subs | 9 h 14 min1,663 subs |
| 30 s | 1 h 33 min186 subs | 2 h 57 min355 subs | 9 h 08 min1,096 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| No filter | 1 h 59 min715 subs | 3 h 24 min1,223 subs | 9 h 34 min3,445 subs |
| dual-band (Dual Band filter), clip-on | 2 h 16 min819 subs | 2 h 42 min974 subs | 4 h 36 min1,654 subs |
The Vespera II has no built-in dual-band filter. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar; the app detects which is fitted. On an emission target like this it is the single biggest upgrade you can make.
About the Soul Nebula
The Heart's companion, a knobbly emission cloud full of pillars. Faint overall; long dual-band integrations reward you.
IC 1848, Sh2-199 · Emission nebula in Cassiopeia · magnitude 6.5 · 60′ × 30′ · best in Oct, Nov, Dec. 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 II
A 50 mm quadruplet on an 8 MP sensor with Vaonis’s mosaic mode for wide fields. Same optics class as the Seestar S50, four times the pixels.
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; the app detects which is fitted.
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 Soul Nebula from a Vespera II? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- Soul Nebula with the ZWO Seestar S50: 3 h 21 min from Bortle 6
- Soul Nebula with the ZWO Seestar S50 Pro: 3 h 46 min from Bortle 6
- Soul Nebula with the ZWO Seestar S30: 3 h 57 min from Bortle 6
- Soul Nebula with the ZWO Seestar S30 Pro: 4 h 04 min from Bortle 6
- Soul Nebula with the DwarfLab DWARF 3: 4 h 06 min from Bortle 6
- Soul Nebula with the DwarfLab DWARF mini: 3 h 18 min from Bortle 6
- Soul Nebula with the DwarfLab Draco: 2 h 39 min from Bortle 6
- Soul Nebula with the DwarfLab DWARF II: 19 h from Bortle 6
- Soul Nebula with the Vaonis Vespera Pro: 12 h from Bortle 6
- Soul Nebula with the Vaonis Vespera 3: 5 h 16 min from Bortle 6
- Soul Nebula with the Vaonis Vespera Pro 2: 12 h from Bortle 6
- Soul Nebula with the Unistellar eQuinox 2: 5 h 05 min from Bortle 6
- Soul Nebula with the Unistellar Odyssey: 24 h from Bortle 6
- Soul Nebula with the Celestron Origin: 1 h 27 min from Bortle 6
- Soul Nebula with the Celestron Origin Mark II: 2 h from Bortle 6
All telescopes for the Soul Nebula · All targets for the Vespera II