Vulpecula
“The Little Fox” · Northern · best around September evenings
Real star positions and magnitudes (HYG database via D3-Celestial, BSD-3). Lines are the conventional stick figure; north is up.
The story
Hevelius's fox (originally 'fox with goose' — the goose survives in its star name, Anser). Faint, but historic twice over: the first pulsar was discovered here in 1967 (Jocelyn Bell's 'LGM-1'), and the Dumbbell Nebula — the first planetary nebula ever found — glows within it.
How to find it
Inside the Summer Triangle, below Cygnus.
✦ What lives inside it
- Dumbbell Nebula (M27)
- First pulsar site
- The Coathanger asterism
The deep dive
Researched for the Atlas from Wikipedia — Vulpecula (4,614 characters read) · updated Sep 20, 2026
01 A constellation born in the 17th century
Vulpecula is not one of the ancient 48 constellations catalogued by Ptolemy. It was invented by the Polish-German astronomer Johannes Hevelius in the late 17th century, making it one of the newer additions to the sky's official roster. Hevelius gave it the full Latin name Vulpecula cum ansere, meaning "the little fox with the goose," and he illustrated it as a fox gripping a goose in its jaws — a vivid, almost fable-like image. For a time, later astronomers split the pattern into two separate constellations: Anser for the goose and Vulpecula for the fox. Eventually the two were merged back together under the fox's name alone. The goose was not forgotten, however. It lives on in the traditional star name Anser, given to Alpha Vulpeculae, the constellation's brightest point of light — a quiet tribute to a bird that briefly had its own place on the celestial map.
02 Why its brightest star is still named for a goose
Alpha Vulpeculae, the brightest star in the constellation, shines at magnitude 4.44 and sits roughly 291 light-years from Earth. That makes it a genuinely faint headliner — there is no star in all of Vulpecula brighter than 4th magnitude, so this is a dim corner of the sky even on the clearest nights. Alpha Vulpeculae is a red giant, its cool, expanded outer layers giving it a reddish hue visible under good conditions. It is also an optical binary: a second star appears very close to it in the sky, separated by 413.7 arcseconds, a gap wide enough to split cleanly with ordinary binoculars even though the two stars are not physically related. The traditional name Anser, Latin for "goose," was kept for this star as a direct echo of Hevelius's original illustration of a fox carrying a goose, preserving the old mythology in the modern catalogue.
03 The discovery that rewrote stellar physics Deeper
In 1967, a landmark discovery emerged from the direction of Vulpecula. Jocelyn Bell, working under the supervision of Antony Hewish at Cambridge, detected a radio signal pulsing with extraordinary regularity — once every 1.3373 seconds. The team had been searching for the scintillation, or twinkling, of radio waves from quasars passing through the solar wind, and this repeating signal was completely unexpected. A key clue ruled out an earthly source: the object reappeared on a sidereal day rather than a solar day, proving it was rotating with the stars rather than tied to any terrestrial transmitter or satellite. The signal was eventually identified as coming from a rapidly rotating neutron star — a pulsar — now catalogued as PSR B1919+21. It was the first pulsar ever discovered anywhere in the universe. Fifteen years later, the first millisecond pulsar, PSR B1937+21, was also found in Vulpecula, only a few degrees away from its famous predecessor.
04 Water vapor on a scorching alien world
Vulpecula contains HD 189733 b, an extrasolar planet notable for being one of the closest such worlds studied by the Spitzer Space Telescope before that observatory's retirement. On 11 July 2007, a team led by Giovanna Tinetti published observations from Spitzer that provided solid evidence for significant amounts of water vapor in the planet's atmosphere — a dramatic finding for planetary science. The catch is that HD 189733 b is nothing like a comfortable home: atmospheric temperatures there rise above 1,000 °C, placing it firmly in the category of a hot Jupiter rather than anything remotely habitable. Nevertheless, the detection mattered enormously because it demonstrated that water, the molecule considered essential to life as we know it, could exist in an exoplanet's atmosphere. Scientists reasoned that if water turns up even on such an extreme world, the odds improve that it will be found on a more Earth-like planet elsewhere.
05 A first radio burst from inside our galaxy Deeper
Vulpecula is also home to a rare and violent object: soft gamma repeater SGR 1935+2154, a type of neutron star known for sporadic bursts of gamma rays. In 2020 this object produced a fast radio burst — an intense, millisecond-duration flash of radio energy — that was detected as the first fast radio burst ever observed originating from within the Milky Way. Before this event, all confirmed fast radio bursts had come from other galaxies, making their origin a profound mystery. Catching one from a known source inside our own galaxy was therefore a pivotal moment for astrophysics, strongly suggesting that at least some fast radio bursts are produced by magnetars — a highly magnetized variety of neutron star. SGR 1935+2154 thus transformed Vulpecula, already famous for the first pulsar, into a constellation twice associated with groundbreaking discoveries in neutron star science.
06 The Dumbbell Nebula and what it tells us
The Dumbbell Nebula, catalogued as Messier 27, holds a genuine historical distinction: it was the very first planetary nebula ever discovered, found by the French astronomer Charles Messier in 1764. Planetary nebulae form when a dying star sheds its outer layers into space, and the Dumbbell is a large, bright example of that process. In binoculars under a dark sky it appears as a dimly glowing disk roughly 8 arcminutes across — about one quarter the apparent width of the full Moon. Bump up the magnification with a telescope and its true shape emerges: a double-lobed structure reminiscent of an hourglass, which explains the nickname. The nebula is approximately 9,800 years old, meaning the stellar material now forming its glowing shell was expelled nearly ten millennia ago. It remains one of the easiest and most rewarding planetary nebulae for amateur observers anywhere in the northern sky.
07 A galactic nursery hiding in plain sight Deeper
Vulpecula contains a dense stellar nursery known as the Vulpecula OB association, or Vul OB1. This grouping sits in the galactic plane at a distance of roughly 2,300 parsecs and spans about 100 parsecs in length — a span of some 326 light-years from one end to the other. It holds nearly 100 OB stars, which are massive, hot, and luminous, as well as over 800 young stellar objects still in the early stages of formation. The intense radiation and stellar winds pouring from those massive stars are actively sculpting the surrounding gas and dust into dramatic pillar-like structures, columns of denser material left standing as the surrounding material is blown away — similar in process to the famous Pillars of Creation. Within Vul OB1 lie three emission-line nebulae catalogued as Sh-86, Sh-87, and Sh-88, where newborn stars are still lighting up the gas clouds from which they formed.
08 A black hole anchoring a galactic collision Deeper
NGC 7052 is an elliptical galaxy in Vulpecula sitting 214 million light-years from Earth. At its center lies a supermassive black hole with a mass of 300 million solar masses — roughly 300 million times the mass of our Sun packed into a single point of no return. Surrounding that black hole is a dusty disk 3,700 light-years in diameter, and astronomers believe this disk is the remnant of a smaller galaxy that once merged with NGC 7052. The collision left behind that ring of gas and dust, now slowly feeding the central black hole. Jets of material stream outward from the nucleus, and the galaxy emits very strong radio waves, earning it the classification of a radio galaxy. It is a striking example of how galaxy mergers can dramatically transform a galaxy's appearance and activity over cosmic timescales, with evidence of the ancient collision still visible hundreds of millions of years later.
09 The largest known structure in the universe
The eastern portion of Vulpecula overlaps with something almost impossible to picture in human terms: the Hercules–Corona Borealis Great Wall, a galaxy filament stretching 3,000 megaparsecs in length. To put that in context, one megaparsec is about 3.26 million light-years, so this structure spans roughly 9.8 billion light-years from end to end — a significant fraction of the entire observable universe. It holds the title of the largest known structure in the universe, a vast web-like sheet of galaxies threaded along filaments of dark matter. Vulpecula's stars are of course nowhere near this structure; they are mere thousands of light-years away. But looking in this direction means that behind the familiar star patterns, far beyond them in depth, lies this titanic arrangement of matter that challenges cosmologists' models of how large a coherent structure can actually grow.
10 The Coathanger: a beautiful false cluster
One of the most charming binocular targets in the summer sky is Brocchi's Cluster, also catalogued as Collinder 399 and popularly known as the Coathanger. The nickname is immediately obvious once you sweep binoculars across it: a straight line of six stars forms the bar of a coathanger, while a curved hook of four more stars hangs below. The pattern is so geometrically satisfying that it looks almost artificial. For a long time it was classified as an open cluster, implying that the stars were born together from the same gas cloud and remain gravitationally related. Later analysis showed that this is actually an asterism — a chance alignment of stars at different distances that happen to form a recognizable shape from our particular vantage point. True cluster or not, the Coathanger is a reliable showpiece for binocular observers in Vulpecula and one of those objects that reliably draws gasps at star parties.