Veil Nebula (Cygnus Loop / NGC 6960 & NGC 6992)
Coordinates, Gaia distance (735 pc), O-III filament structure, and visual filter guide for the Veil Nebula supernova remnant in Cygnus.
Provenance-Backed Scientific Measurements
Every measurement below preserves its unit, uncertainty interval, observational method, reference epoch, quality status, and primary catalog source. See Uncertainty & Provenance for how competing measurements are handled.
| Parameter | Value | Uncertainty | Method & Epoch | Quality Status | Source Archive |
|---|---|---|---|---|---|
| Integrated visual magnitude (V) | 7 mag | ± 0.3 mag | Integrated emission across NGC 6960 + NGC 6992/6995 | high-confidence | Revised New General Catalogue and Index Catalogue (RNGC/IC) |
| Distance (Gaia DR3 background/absorber stars) | 735 pc | ± 25 pc | Gaia DR3 parallaxes of stars showing high-velocity interstellar absorption from the SNR shell (J2016.0) | definitive | ESA Gaia Archive — Data Release 3 |
| Full Cygnus Loop angular diameter | 180 arcmin | ± 10 arcmin | Optical and soft X-ray blast wave diameter (~3.0°) | definitive | Revised New General Catalogue and Index Catalogue (RNGC/IC) |
| Remnant expansion age | 0.000015 Gyr | ± 0.000005 Gyr | Sedov-Taylor shock deceleration modeling (~10,000–20,000 yr) | model-dependent | SIMBAD Astronomical Database (CDS) |
J2000 Equatorial Sky Chart & Culmination Altitude
The chart below plots Veil Nebula (Cygnus Loop NGC 6960/6992) at RA 20h 45m 36.00s, Dec +30° 42′ 36.0″ within Cygnus, alongside peak meridian transit altitudes for 40°N and 30°S observers. Use the RA/Dec Coordinate Converter to compute exact culmination altitude for your latitude.
Astrophysical Context & Structure
The Veil Nebula (the optical arcs of the Cygnus Loop) is a vast, delicate shell-type supernova remnant spanning 3 full degrees across southern Cygnus—six times the diameter of the full Moon. Situated 735 ± 25 parsecs (2,400 light-years) away, the remnant has a physical diameter of roughly 130 light-years and originated when a 12-to-15 solar-mass star exploded 10,000 to 20,000 years ago inside a low-density wind-blown cavity.
Discovered by William Herschel in September 1784, the Veil is divided into three main visual arcs: the Western Veil (NGC 6960, or the 'Witch's Broom') passing straight across the 4.2-magnitude foreground star 52 Cygni; the brighter, broader Eastern Veil (NGC 6992, NGC 6995, and IC 1340); and Fleming's Triangular Wisp (Pickering's Triangle) between them.
The hair-thin filaments we see are actually corrugated sheets of shock-heated gas viewed edge-on, where the supernova blast wave (~170–350 km/s) slams into denser interstellar cloudlets and excites forbidden doubly ionized oxygen ([O III]) and Balmer H-alpha emission.
Practical Visual Observing Guide
- Start at Gienah (ε Cygni) in the eastern wing of Cygnus and drop 3° south to 4.2-magnitude 52 Cygni, which sits directly superimposed on the Western Veil (NGC 6960); sweep 2.5° east-northeast to reach the brighter Eastern Veil (NGC 6992/6995).
- An O-III narrowband filter is transformative on the Veil: without a filter the filaments are barely visible under suburban skies, whereas with an O-III filter in an 80–250 mm telescope at 30×–60× the braided lacework pops out against a jet-black background.
- Under dark Bortle 2–3 skies, 10×50 or 15×70 binoculars with O-III filters held over the eyepieces can frame the entire 3-degree loop at once.
Catalog Cross-Identifications & Aliases
Common Aliases: Cygnus Loop · NGC 6960 · NGC 6992 · Witch's Broom Nebula · Caldwell 33 & 34
| Catalog Authority | Identifier |
|---|---|
| NGC | NGC 6960 / NGC 6992 |
| SIMBAD | NGC 6992 |
| WIKIDATA | Q488500 |
Related Objects, Comparisons & Guides
Crab Nebula (Messier 1 Supernova Remnant)
Coordinates, Gaia DR3 distance (1.96 kpc), SN 1054 history, pulsar wind physics, and observing guide for the Crab Nebula (M1) in Taurus.
Cassiopeia A (3C 461 Young Supernova Remnant)
Coordinates, kinematic distance (3.4 kpc), JWST/Chandra ejecta knots, and high-aperture observing guide for Cassiopeia A (3C 461).
Albireo (Beta Cygni Color Double Star)
Coordinates, Gaia DR3 parallaxes of Beta Cygni A & B, 34.6″ angular separation, color contrast, and observing guide for Albireo in Cygnus.
Northern Summer Milky Way Observing Tour
Summer observing guide from the Summer Triangle (Vega, Altair, Deneb) and Hercules Keystone down the Milky Way rift to the Sagittarius Galactic Center.
Surface Brightness vs Magnitude Field Guide
Field guide to how surface brightness (mag/arcsec²) and integrated magnitude govern naked-eye, binocular, and telescope visibility of nebulae and galaxies.
Surface Brightness & Extended Objects Guide
Why surface brightness (mag/arcsec²) governs nebula and galaxy visibility more than integrated magnitude, and how exit pupil controls eyepiece contrast.
Angular Size, Separation & Field of View
How angular diameter (degrees, arcminutes, arcseconds), spherical angular separation, and small-angle physical diameter relate to telescope field of view.
NGC & Caldwell Deep-Sky Cross-Walk Catalog
Cross-reference guide to Dreyer's New General Catalogue (NGC) showpieces, including southern gems Omega Centauri, 47 Tucanae, Carina Nebula, and the Veil.
Scientific Sources & Dataset Provenance
- Revised New General Catalogue and Index Catalogue (RNGC/IC) (2024/2026 edition): Steinicke, W. 2010, Observing and Cataloguing Nebulae and Star Clusters (Cambridge Univ. Press); Verga, M. OpenNGC (CC-BY-SA 4.0 / data tables) — Wolfgang Steinicke / OpenNGC
- ESA Gaia Archive — Data Release 3 (DR3 (2022-06-13)): Gaia Collaboration, Vallenari, A., et al. 2023, A&A, 674, A1 (Gaia Data Release 3) — European Space Agency / Gaia DPAC
- SIMBAD Astronomical Database (CDS) (2026-10 release): Wenger, M., et al. 2000, A&AS, 143, 9 (The SIMBAD astronomical database) — Centre de Données astronomiques de Strasbourg