Cygnus

Northern Cross

Cygnus cross

common observer pattern · high confidence

The long axis of Cygnus turns into a cross flying down the Milky Way. Binoculars enrich the field around Sadr, but the cross itself is cleanly naked-eye.

Central RA: 20^h 13^m 08.3^s
Central Dec: +38° 31′ 10″
Brightest member: V 1.25
Best months from 50°N: June–September evenings
Suggested instrument: naked-eye
Approx. span: 22.3°

Finder context

This wider chart is deliberately schematic: it uses nearby bright-star context and boxes the asterism’s member-star footprint, but it does not draw official constellation boundaries or promise horizon/season precision.

Framing: Approximate member-star span: 22.3°; use at least 31.2° field for context.

Observing and imaging

Naked eye

Primary naked-eye pattern; suburban skies should show the main stars unless the description notes a low horizon or dark-sky need.

Binoculars

Binoculars are optional: use them to check colours, nearby doubles, or richer Milky Way background.

Small scope

A telescope is usually too narrow for the whole shape; use it after the pattern has guided you to a target.

Imaging

Frame as a wide-field scene in/near Cygnus; a field of view around 31° keeps context without claiming exact constellation boundaries.

Tonight from your latitude

Observability from your latitude: uses this asterism’s centroid RA/Dec with a schematic local clock from longitude, astronomical twilight (Sun below −18°), and the 2026 Moon heuristic. Month stays for the seasonal readout.

Latitude 50°NLongitude -114°Date Month Sky darkness Bortle 4 · limit V 6.1

Naked-eye visibility by sky class

Approximate limiting magnitudes: Bortle 3 ≈ V 6.6, Bortle 5 ≈ V 5.6, Bortle 7 ≈ V 4.6. The shape is counted recognisable when at least 70% of defining stars clear the limit.

Bortle 3: 5/5 stars — fully visibleBortle 5: 5/5 stars — fully visibleBortle 7: 5/5 stars — fully visible

Moon impact

Reference year 2026, Sep: 23/30 nights (77%) have a sampled ≥2 h window with Northern Cross above 20° and the Moon below the horizon. At transit the Moon is up on about 53% of nights; the average moonlight penalty is roughly 0.47 mag of naked-eye limiting magnitude. Good nights below are the deterministic 2026 best-month mini-calendar for 50°N; green means a ≥2 h sampled dark window with the Moon down.

010203040506070809101112131415161718192021222324252627282930

Member stars

Name	Bayer / Flamsteed	HR	RA J2000	Dec J2000	V mag
Deneb	50Alp Cyg	HR 7924	20^h 41^m 25.9^s	+45° 16′ 49″	1.25
Sadr	37Gam Cyg	HR 7796	20^h 22^m 13.7^s	+40° 15′ 24″	2.20
Gienah	53Eps Cyg	HR 7949	20^h 46^m 12.7^s	+33° 58′ 13″	2.46
Delta Cygni	18Del Cyg	HR 7528	19^h 44^m 58.5^s	+45° 07′ 51″	2.87
Albireo	6Bet1Cyg	HR 7417	19^h 30^m 43.3^s	+27° 57′ 35″	3.08

Source and confidence

common observer pattern; high confidence. Commonly used constellation-part or seasonal guide-pattern name, with member-star positions plotted from BSC5.

Citations

Bright Star Catalogue, 5th Revised Ed.: Hoffleit, D. & Warren, W.H. Jr. (1991). Positions, V magnitudes, Bayer/Flamsteed identifiers. source
Star Tales: Ridpath, I. Constellation and asterism notes used to cross-check common sky-pattern names. source
The Hipparcos and Tycho Catalogues: ESA SP-1200 (1997). Used as the modern astrometric reference named by the atlas; the MVP pages expose BSC5 J2000 fields for the plotted bright-star members.