How long should I image the Sculptor Galaxy with the Vespera Pro from a Bortle 6 sky?

About 1 h 05 min of total integration for a solid image, or 4 h 20 min for a showpiece. A quick look takes 16 min.

How many subs is that on the Vespera Pro?

At the default 10 s sub length, 391 subs for a solid image from Bortle 6 and 180 from Bortle 3.

Does a dual-band filter help on the Sculptor Galaxy?

No. The Sculptor Galaxy is a broadband target and a dual-band filter blocks most of its light. Shoot without a filter.

How long to image the Sculptor Galaxy with the Vaonis Vespera Pro

From a Bortle 6 suburban sky, the Vaonis Vespera Pro needs about 1 h 05 min (391 subs of 10 s) for a solid image of the Sculptor Galaxy. A quick look takes 16 min; a showpiece 4 h 20 min. Under a Bortle 3 rural sky the solid figure drops to 30 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 28% of the frame’s short side.

Sculptor Galaxy with the Vaonis Vespera Pro: 10 s subs.
Sky	Quick lookTarget obvious, still noisy	SolidClean enough to share	ShowpieceSmooth faint detail, print-worthy
Bortle 1Excellent dark site	7 min40 subs	27 min160 subs	1 h 46 min637 subs
Bortle 2Typical dark site	7 min42 subs	28 min167 subs	1 h 51 min666 subs
Bortle 3Rural	7 min45 subs	30 min180 subs	2 h719 subs
Bortle 4Rural / suburban transition	9 min54 subs	35 min213 subs	2 h 21 min849 subs
Bortle 5Suburban	11 min66 subs	44 min264 subs	2 h 56 min1,056 subs
Bortle 6Bright suburban	16 min98 subs	1 h 05 min391 subs	4 h 20 min1,561 subs
Bortle 7Suburban / urban transition	26 min158 subs	1 h 45 min632 subs	7 h 01 min2,525 subs
Bortle 8City	42 min252 subs	2 h 48 min1,006 subs	11 h4,021 subs
Bortle 9Inner city	1 h 15 min451 subs	5 h1,803 subs	20 h7,212 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 1 h 25 min of run time. The Vespera Pro’s battery (rated about 11 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.)

USB-C PD power bank 20000mAh 30WExtends the 11 h battery; 30 W PD per Vaonis.
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How it frames

The Sculptor Galaxy is 27′ × 7′ across. The Vespera Pro frames 1.62° × 1.62° at 1.65″ per pixel, so it fills 28% of the frame’s short side.

Longer subs

10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only, no EQ mode. Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
10 s	30 min180 subs	44 min264 subs	1 h 45 min632 subs
20 s	26 min77 subs	40 min119 subs	1 h 41 min303 subs
30 s	24 min49 subs	38 min77 subs	1 h 39 min199 subs

About the Sculptor Galaxy

A big, dusty, nearly edge-on starburst galaxy, superb from the south and low but possible from mid-northern latitudes.

NGC 253, Caldwell 65, Silver Coin · Galaxy in Sculptor · magnitude 7.2 · 27′ × 7′ · best in Sep, Oct, Nov. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.

Galaxies are broadband targets: their light is mostly starlight spread across the spectrum, so a dual-band filter throws most of it away and makes things slower, not faster. Shoot without a filter (or with a plain UV/IR cut) and rely on total time and a dark sky. The core of a galaxy is usually many times brighter than its outer disc, so a short stack shows the nucleus long before the arms; the figures here are for the arms and disc, not the core.

Field rotation in Alt-Az mode crops the edges of the stack over a long session, so on a big galaxy re-centre now and then or use EQ mode where your scope supports it.

About the Vaonis Vespera Pro

The square-sensor Vespera with 2 µm pixels. Higher resolution than the II, and correspondingly slower per pixel: expect around double the time for the same per-pixel SNR. Run-out in 2026 and replaced by the Vespera Pro 2.

10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only, no EQ mode. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar.

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 Sculptor Galaxy with your Vespera Pro? Did the solid figure match?Anonymous, one tap. It is how the model gets calibrated.

Have an image of the Sculptor Galaxy from a Vespera Pro? Email it with your total time and sky to [email protected] and it goes here, credited.

Same target, other telescopes

All telescopes for the Sculptor Galaxy · All targets for the Vespera Pro