How long to image the Owl Cluster with the Celestron Origin
From a Bortle 6 suburban sky, the Celestron Origin needs about 5 min (30 subs of 10 s) for a solid image of the Owl Cluster. A quick look takes 2 min; a showpiece 15 min. Under a Bortle 3 rural sky the solid figure drops to 5 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 25% 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 min10 subs | 5 min30 subs | 15 min90 subs |
| Bortle 2Typical dark site | 2 min10 subs | 5 min30 subs | 15 min90 subs |
| Bortle 3Rural | 2 min10 subs | 5 min30 subs | 15 min90 subs |
| Bortle 4Rural / suburban transition | 2 min10 subs | 5 min30 subs | 15 min90 subs |
| Bortle 5Suburban | 2 min10 subs | 5 min30 subs | 15 min90 subs |
| Bortle 6Bright suburban | 2 min10 subs | 5 min30 subs | 15 min90 subs |
| Bortle 7Suburban / urban transition | 2 min10 subs | 5 min30 subs | 15 min90 subs |
| Bortle 8City | 2 min10 subs | 5 min30 subs | 15 min90 subs |
| Bortle 9Inner city | 2 min10 subs | 5 min30 subs | 15 min90 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 7 min of run time. The Origin’s battery (rated about 6 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.)
- portable power station 300W AC outletRuns the supplied 12 V adapter in the field; the dew shield and heater are already built in.
- 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 Origin →
How it frames
The Owl Cluster is 13′ across. The Origin frames 1.27° × 0.85° at 1.48″ per pixel, so it fills 25% of the frame’s short side.
Longer subs
10 s auto subs (15 s with the Nebula Filter); manual 1 to 30 s on the alt-az mount, longer only with the EQ wedge, and 60 s and up needs the StarSense Autoguider too. Time for a solid image by sub length:
| Sub length | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| 10 s | 5 min30 subs | 5 min30 subs | 5 min30 subs |
| 15 s | 8 min30 subs | 8 min30 subs | 8 min30 subs |
| 30 s | 15 min30 subs | 15 min30 subs | 15 min30 subs |
About the Owl Cluster
Two bright stars for eyes and outstretched arms of fainter ones. A crowd-pleaser that needs only minutes.
NGC 457, Caldwell 13, ET Cluster · Open cluster in Cassiopeia · magnitude 6.4 · 13′ · best in Sep, Oct, Nov. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Open clusters are the easiest targets in the sky. The stars are bright, so the aim is colour and tight stars rather than depth: short subs, no filter, and stop before the bright members saturate. The nominal time here gets you clean star colour; more integration only adds background stars.
About the Celestron Origin
The first-generation Origin: a 6-inch f/2.2 RASA in a smart package and the fastest system here by a wide margin. Superseded by the Mark II in late 2025 and no longer sold new; Celestron offers a camera upgrade to the Mark II sensor.
10 s auto subs (15 s with the Nebula Filter); manual 1 to 30 s on the alt-az mount, longer only with the EQ wedge, and 60 s and up needs the StarSense Autoguider too. Filter drawer takes 1.25-inch or 2-inch filters, including dual-band; Celestron sells an optional Nebula 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 Owl Cluster from a Origin? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- Owl Cluster with the ZWO Seestar S50: 5 min from Bortle 6
- Owl Cluster with the ZWO Seestar S50 Pro: 5 min from Bortle 6
- Owl Cluster with the ZWO Seestar S30: 5 min from Bortle 6
- Owl Cluster with the ZWO Seestar S30 Pro: 5 min from Bortle 6
- Owl Cluster with the DwarfLab DWARF 3: 8 min from Bortle 6
- Owl Cluster with the DwarfLab DWARF mini: 8 min from Bortle 6
- Owl Cluster with the DwarfLab Draco: 15 min from Bortle 6
- Owl Cluster with the DwarfLab DWARF II: 9 min from Bortle 6
- Owl Cluster with the Vaonis Vespera II: 5 min from Bortle 6
- Owl Cluster with the Vaonis Vespera Pro: 7 min from Bortle 6
- Owl Cluster with the Vaonis Vespera 3: 5 min from Bortle 6
- Owl Cluster with the Vaonis Vespera Pro 2: 6 min from Bortle 6
- Owl Cluster with the Unistellar eQuinox 2: 2 min from Bortle 6
- Owl Cluster with the Unistellar Odyssey: 10 min from Bortle 6
- Owl Cluster with the Celestron Origin Mark II: 5 min from Bortle 6
All telescopes for the Owl Cluster · All targets for the Origin