How long should I image the Pelican Nebula with the Origin Mark II from a Bortle 6 sky?

About 1 h 10 min of total integration for a solid image, or 4 h 40 min for a showpiece. A quick look takes 17 min.

How many subs is that on the Origin Mark II?

At the default 10 s sub length, 420 subs for a solid image from Bortle 6 and 121 from Bortle 3.

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

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 1 h 10 min to 30 min.

How long to image the Pelican Nebula with the Celestron Origin Mark II

From a Bortle 6 suburban sky, the Celestron Origin Mark II needs about 1 h 10 min (420 subs of 10 s) for a solid image of the Pelican Nebula. A quick look takes 17 min; a showpiece 4 h 40 min. Under a Bortle 3 rural sky the solid figure drops to 20 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 is just over the frame at 1.3×.

Pelican Nebula with the Celestron Origin Mark II: 10 s subs.
Sky	Quick lookTarget obvious, still noisy	SolidClean enough to share	ShowpieceSmooth faint detail, print-worthy
Bortle 1Excellent dark site	4 min23 subs	15 min92 subs	1 h 01 min366 subs
Bortle 2Typical dark site	4 min26 subs	17 min102 subs	1 h 08 min406 subs
Bortle 3Rural	5 min31 subs	20 min121 subs	1 h 20 min483 subs
Bortle 4Rural / suburban transition	7 min42 subs	28 min167 subs	1 h 51 min667 subs
Bortle 5Suburban	10 min60 subs	40 min240 subs	2 h 40 min960 subs
Bortle 6Bright suburban	17 min105 subs	1 h 10 min420 subs	4 h 40 min1,679 subs
Bortle 7Suburban / urban transition	32 min191 subs	2 h 07 min763 subs	8 h 28 min3,049 subs
Bortle 8City	54 min324 subs	3 h 36 min1,294 subs	14 h5,176 subs
Bortle 9Inner city	1 h 41 min607 subs	6 h 45 min2,428 subs	27 h9,712 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 1 h 31 min of run time. The Origin Mark II’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.)

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How it frames

The Pelican Nebula is 60′ × 50′ across. The Origin Mark II frames 1.32° × 0.75° at 1.23″ per pixel, so it is just over the frame at 1.3×. Point at the part you want; the edges will fall outside the frame.

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. Celestron warns the f/2.2 optics saturate quickly without the filter. Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
10 s	20 min121 subs	40 min240 subs	2 h 07 min763 subs
15 s	20 min79 subs	40 min159 subs	2 h 07 min507 subs
30 s	19 min39 subs	39 min79 subs	2 h 06 min253 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	20 min121 subs	40 min240 subs	2 h 07 min763 subs
dual-band (Nebula Filter), drawer	15 min92 subs	21 min128 subs	48 min288 subs

The Origin Mark II 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 Pelican Nebula

The North America Nebula's neighbour across a dark gulf, with pillars along its beak. Fainter than NGC 7000 and worth its own session.

IC 5070 · Emission nebula in Cygnus · magnitude 8.0 · 60′ × 50′ · 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 Celestron Origin Mark II

The Origin Mark II (late 2025): the same 6-inch f/2.2 RASA with an 8 MP IMX678 in place of the original 6 MP IMX178. Smaller pixels for finer detail, a quieter sensor, and still the fastest system here by a wide margin.

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.

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

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

Same target, other telescopes

All telescopes for the Pelican Nebula · All targets for the Origin Mark II