How long should I image the Owl Nebula with the Origin from a Bortle 6 sky?

About 14 min of total integration for a solid image, or 57 min for a showpiece. A quick look takes 4 min.

How many subs is that on the Origin?

At the default 10 s sub length, 86 subs for a solid image from Bortle 6 and 35 from Bortle 3.

Does a dual-band filter help on the Owl Nebula?

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 14 min to 9 min.

How long to image the Owl Nebula with the Celestron Origin

From a Bortle 6 suburban sky, the Celestron Origin needs about 14 min (86 subs of 10 s) for a solid image of the Owl Nebula. A quick look takes 4 min; a showpiece 57 min. Under a Bortle 3 rural sky the solid figure drops to 6 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 7% of the frame’s short side.

Owl Nebula with the Celestron Origin: 10 s subs.
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	20 min118 subs
Bortle 2Typical dark site	2 min10 subs	5 min31 subs	21 min124 subs
Bortle 3Rural	2 min10 subs	6 min35 subs	23 min138 subs
Bortle 4Rural / suburban transition	2 min11 subs	7 min43 subs	28 min169 subs
Bortle 5Suburban	2 min14 subs	9 min55 subs	36 min219 subs
Bortle 6Bright suburban	4 min22 subs	14 min86 subs	57 min343 subs
Bortle 7Suburban / urban transition	6 min37 subs	24 min145 subs	1 h 36 min577 subs
Bortle 8City	10 min59 subs	39 min236 subs	2 h 37 min942 subs
Bortle 9Inner city	18 min108 subs	1 h 12 min430 subs	4 h 46 min1,719 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 19 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.
Amazon UK Amazon US Jackery UK
red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
Amazon UK Amazon US

Affiliate links: the retailer pays us a small commission and you pay the same price. These are search links to the named product, not endorsements of a particular listing; check the listing matches your model.

Everything that fits the Origin →

How it frames

The Owl Nebula is 3.4′ × 3.3′ across. The Origin frames 1.27° × 0.85° at 1.48″ per pixel, so it fills 7% 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	6 min35 subs	9 min55 subs	24 min145 subs
15 s	8 min30 subs	9 min36 subs	24 min95 subs
30 s	15 min30 subs	15 min30 subs	23 min47 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	6 min35 subs	9 min55 subs	24 min145 subs
dual-band (Nebula Filter), drawer	6 min38 subs	7 min44 subs	12 min71 subs

The Origin has no built-in dual-band filter. Filter drawer takes 1.25-inch or 2-inch filters, including dual-band; Celestron sells an optional Nebula Filter. On an emission target like this it is the single biggest upgrade you can make.

About the Owl Nebula

A round planetary with two dark eyes. Large for its class and low in surface brightness; dual-band helps a lot.

M97, NGC 3587 · Planetary nebula in Ursa Major · magnitude 9.9 · 3.4′ × 3.3′ · best in Feb, Mar, Apr. 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 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.

Where to buy the OriginAmazon UK Amazon USAffiliate links: As an Amazon Associate I earn from qualifying purchases, at no cost to you.

Imaged the Owl Nebula with your Origin? Did the solid figure match?Anonymous, one tap. It is how the model gets calibrated.

Have an image of the Owl Nebula from a Origin? Email it with your total time and sky to [email protected] and it goes here, credited.

Same target, other telescopes

All telescopes for the Owl Nebula · All targets for the Origin