10/13/2026
The Tulip Nebula and Cygnus X-1
This is the Tulip Nebula, a star forming and ionization area which looks a bit like a tulip, (including the black stamens). I've always liked this pretty nebula. In this fairly deep view, you can see how it sits within hydrogen and dust clouds with the glow created by the stellar wind from the hot O-type super giant star HD 227018
The other area of interest ( especially to fans of the Canadian prog-rock band Rush) is Cygnus X-1
Cygnus X-1 is the most powerful source of X-rays in the nearby milky way, BTW first discoverd from a ballon in the upper atmosphere, and these x-rays are produced by the immense heat produced in the accretion disk surrounding a black hole. So, Cygnus X-1 is a black hole.
In an image like this, (in the visual spectrum) we can't see the black hole; it's tiny ( a few hundred miles across), but we can clearly see its effects on the surrounding interstellar medium.
Seen just in front of the "Tulip" is an arc, ( shown here in a blue color); this is a bow shock, similar principle of a ship sailing through the ocean pushing aside the water. In this case, the rapidly spinning accretion disk is pushing out a jet of stellar material at 90 degrees to the direction of rotation and pushing aside (and ionizing) the gas it encounters in the ISM.
It's a very cool and interesting object: The black hole is in a rapid orbit with giant star HD HDE 226868 which can be seen in this image. They orbit their center of mass very rapidly with one orbit taking 5.6 days, they are separated by about 20% of the distance the earth is from the sun !
Measurements indicate that the super-giant star is about 40 solar masses, and the black hole itself is around 18 solar masses. It's now thought that the black hole is rotating at a speed of 800 revolutions per second!
This is a modified HOO image using a custom pixel math expression to combine the Hydrogen and Oxygen data in a way that I find aesthetically pleasing, plus a blended SOO image combining Sulfur and Oxygen for the bluish ionization at the core of the Tulip
Shot from Animas , NM over many nights over the last few months with terrible weather conditions in the area prevailing for months.
I hope that you like it.
Image and words Credit: Richard Whitehead, Treasurer, VAS