How long to image the Tulip Nebula with the Unistellar Odyssey
From a Bortle 6 suburban sky, the Unistellar Odyssey needs about 16 h (14,795 subs of 4 s) for a solid image of the Tulip Nebula. A quick look takes 4 h 07 min; a showpiece 66 h. Under a Bortle 3 rural sky the solid figure drops to 11 h. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 48% 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 | 2 h 35 min2,329 subs | 10 h9,316 subs | 41 h37,264 subs |
| Bortle 2Typical dark site | 2 h 38 min2,372 subs | 11 h9,485 subs | 42 h37,937 subs |
| Bortle 3Rural | 2 h 43 min2,451 subs | 11 h9,803 subs | 44 h39,210 subs |
| Bortle 4Rural / suburban transition | 2 h 56 min2,644 subs | 12 h10,574 subs | 47 h42,295 subs |
| Bortle 5Suburban | 3 h 17 min2,949 subs | 13 h11,796 subs | 52 h47,183 subs |
| Bortle 6Bright suburban | 4 h 07 min3,699 subs | 16 h14,795 subs | 66 h59,178 subs |
| Bortle 7Suburban / urban transition | 5 h 42 min5,128 subs | 23 h20,509 subs | 91 h82,033 subs |
| Bortle 8City | 8 h 10 min7,345 subs | 33 h29,380 subs | 130+ h117,519 subs |
| Bortle 9Inner city | 13 h12,075 subs | 54 h48,300 subs | 210+ h193,200 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 21 h of run time. That is more than one night: over 4 nights, about 5 h 21 min each. The Odyssey’s battery is rated at about 5 h, so each night needs an external power bank. (Bortle 6, solid image; we allow 30% over the integration time.)
- USB power bank 20000mAh 5V 2.4AUnistellar says plain 5 V 2.4 A and warns against fast or adaptive chargers.
- red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
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Everything that fits the Odyssey →
How it frames
The Tulip Nebula is 16′ × 9′ across. The Odyssey frames 0.75° × 0.56° at 0.93″ per pixel, so it fills 48% of the frame’s short side.
Filters
The Tulip Nebula is an emission target, where a dual-band filter would normally cut the time several-fold from a lit sky, but the Odyssey has no dual-band option: No filter option; Unistellar says third-party filters cannot be fitted to the Odyssey. The figures above are for the No filter position, and a darker sky is the lever that remains.
About the Tulip Nebula
A compact hydrogen bloom in Cygnus near the black hole Cygnus X-1. Small and moderately faint; dual-band.
Sh2-101 · Emission nebula in Cygnus · magnitude 9.0 · 16′ × 9′ · best in Jul, Aug, Sep. 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 Unistellar Odyssey
Unistellar’s compact 85 mm with autofocus and tiny pixels. Sharp, but the fine sampling costs time on faint extended targets. The Odyssey Pro is the same telescope with an eyepiece added, so these figures apply to both.
Fixed 4 s subs in Enhanced Vision; they cannot be changed. No filter option; Unistellar says third-party filters cannot be fitted to the Odyssey.
The Odyssey uses fixed 4 s subs, so the only levers you have are the sky you shoot from, the filter, and total time.
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 Tulip Nebula from a Odyssey? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- Tulip Nebula with the ZWO Seestar S50: 2 h 22 min from Bortle 6
- Tulip Nebula with the ZWO Seestar S50 Pro: 2 h 40 min from Bortle 6
- Tulip Nebula with the ZWO Seestar S30: 2 h 47 min from Bortle 6
- Tulip Nebula with the ZWO Seestar S30 Pro: 2 h 53 min from Bortle 6
- Tulip Nebula with the DwarfLab DWARF 3: 2 h 55 min from Bortle 6
- Tulip Nebula with the DwarfLab DWARF mini: 2 h 20 min from Bortle 6
- Tulip Nebula with the DwarfLab Draco: 1 h 52 min from Bortle 6
- Tulip Nebula with the DwarfLab DWARF II: 13 h from Bortle 6
- Tulip Nebula with the Vaonis Vespera II: 3 h 51 min from Bortle 6
- Tulip Nebula with the Vaonis Vespera Pro: 8 h 39 min from Bortle 6
- Tulip Nebula with the Vaonis Vespera 3: 3 h 41 min from Bortle 6
- Tulip Nebula with the Vaonis Vespera Pro 2: 8 h 15 min from Bortle 6
- Tulip Nebula with the Unistellar eQuinox 2: 3 h 32 min from Bortle 6
- Tulip Nebula with the Celestron Origin: 1 h 01 min from Bortle 6
- Tulip Nebula with the Celestron Origin Mark II: 1 h 24 min from Bortle 6
All telescopes for the Tulip Nebula · All targets for the Odyssey