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

About 1 h 45 min of total integration for a solid image, or 6 h 58 min for a showpiece. A quick look takes 26 min.

How many subs is that on the Origin?

At the default 10 s sub length, 628 subs for a solid image from Bortle 6 and 194 from Bortle 3.

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

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 1 h 45 min to 52 min.

How long to image the Jellyfish Nebula with the Celestron Origin

From a Bortle 6 suburban sky, the Celestron Origin needs about 1 h 45 min (628 subs of 10 s) for a solid image of the Jellyfish Nebula. A quick look takes 26 min; a showpiece 6 h 58 min. Under a Bortle 3 rural sky the solid figure drops to 32 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 only just fits, at 98% of the short side.

Jellyfish 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	6 min38 subs	25 min151 subs	1 h 41 min604 subs
Bortle 2Typical dark site	7 min42 subs	28 min166 subs	1 h 50 min663 subs
Bortle 3Rural	8 min49 subs	32 min194 subs	2 h 09 min773 subs
Bortle 4Rural / suburban transition	11 min66 subs	43 min261 subs	2 h 54 min1,042 subs
Bortle 5Suburban	15 min92 subs	1 h 01 min367 subs	4 h 04 min1,467 subs
Bortle 6Bright suburban	26 min157 subs	1 h 45 min628 subs	6 h 58 min2,510 subs
Bortle 7Suburban / urban transition	47 min282 subs	3 h 07 min1,125 subs	12 h4,497 subs
Bortle 8City	1 h 19 min474 subs	5 h 16 min1,896 subs	21 h7,583 subs
Bortle 9Inner city	2 h 28 min886 subs	9 h 50 min3,541 subs	39 h14,164 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 2 h 16 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, and 30% off the battery for a January night.)

portable power station 300W AC outletRuns the supplied 12 V adapter in the field; the dew shield and heater are already built in.
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red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
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How it frames

The Jellyfish Nebula is 50′ × 40′ across. The Origin frames 1.27° × 0.85° at 1.48″ per pixel, so it only just fits, at 98% of the short side. Centre it carefully: there is no room to crop back afterwards.

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	32 min194 subs	1 h 01 min367 subs	3 h 07 min1,125 subs
15 s	30 min119 subs	59 min235 subs	3 h 05 min740 subs
30 s	27 min55 subs	56 min113 subs	3 h 02 min365 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	32 min194 subs	1 h 01 min367 subs	3 h 07 min1,125 subs
dual-band (Nebula Filter), drawer	30 min178 subs	38 min231 subs	1 h 17 min463 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 Jellyfish Nebula

A supernova remnant beside Propus in Gemini, with a bright rim like a jellyfish bell. Faint; dual-band and hours.

IC 443, Sh2-248 · Supernova remnant in Gemini · magnitude 12.0 · 50′ × 40′ · best in Dec, Jan, Feb. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.

Supernova remnants are emission-line objects, strong in both hydrogen-alpha and OIII, and their filaments are thin, so pixel scale matters as much as aperture. A dual-band filter is essential from any lit sky and still helps under a dark one. These are long-integration targets; plan on several sessions and stack across nights.

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.

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

Have an image of the Jellyfish 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 Jellyfish Nebula · All targets for the Origin