Star Stars · In Scorpius
Fang
Fang, π Scorpii, is a blue-white main-sequence star in Scorpius: the 158th brightest star in the night sky.
Save the chart (SVG) Tactile chart (A4 SVG)
- Constellation
- Scorpius
- Designation
- π Scorpii
- Apparent magnitude
- 2.89 · 158th brightest star in the night sky
- Spectral class
- B1V + B2V
- Distance
- 586 light-years
- Highest at midnight
- mid May
- Position (J2000)
- RA 15h 59m · Dec −26° 07′
A blue-white main-sequence star, around 28,000 K, like Rigel and Spica. About 28× brighter than the faintest star the eye can see. Gives off about 1,900 times the Sun's visible light. The light you are seeing left around 1440.
When to see it
On the night of Wed 19 May 2027, when it is highest around midnight, on each city’s own clock:
| From | Rises | Highest | Sets |
|---|---|---|---|
| London GMT+1 | 21:44 | 01:11 · 12° | 04:37 |
| New York EDT | 20:46 | 01:06 · 23° | 05:25 |
| Singapore GMT+8 | 19:20 | 01:16 · 62° | 07:12 |
| Sydney GMT+10 | 16:51 | 00:07 · 82° | 07:23 |
Common questions
- Can I see it from 50° north?
- Yes. It rises and sets, and at its highest it stands 14° up in the south.
- Can I see it from 35° south?
- Yes, and well placed: at its highest it passes almost overhead, 81° up, above most of the air’s haze.
- When is the best time of year to see it?
- Around mid May, when it stands opposite the Sun and is highest at midnight. It comes round about two hours earlier each month, so by mid August it is highest in the early evening, and in mid February not until the hours before dawn.
- How far away is it, and how bright?
- It is 586 light-years away, and shines at magnitude 2.89 in our sky. From that far, the Sun would be a star of magnitude 11.1: too faint for anything less than a telescope.
- Naked eye, binoculars or telescope?
- The naked eye, even from a city: at magnitude 2.89 it is brighter than the faintest stars a city sky still shows, about magnitude 4.5.
Look for
Start from Dschubba: Fang is 3.5° south of it, three fingers at arm’s length.
Look for
From 50° north it climbs to 14°; from 35° north it climbs to 29°; from the equator it climbs to 64°; from 35° south it climbs to 81°.
Science
Fang’s surface is about 28,000 K, some 22,200 K hotter than the Sun’s 5,772 K, so its light is strongest at about 100 nm, in the ultraviolet, past the violet end of what the eye can see, where the Sun’s is strongest at 500 nm. Moved to 33 light-years, the distance astronomers compare stars at, it would shine at magnitude −3.4, brighter than Sirius, the brightest star in our sky.
Did you know
Against Dschubba, the brighter star the hop starts from: Dschubba looks 1.7 times as bright as Fang in our sky; Dschubba is 491 light-years away and Fang 586 light-years, so side by side they would give off about as much light.
Science
Fang is the 139th nearest to us of the 156 stars on these pages with a measured distance. Its nearest neighbour among them in space is Antares, about 75 light-years from it; on our sky the two are 6.9° apart.
Look for
Fang lies 5.5° south of the ecliptic, close enough to the Sun’s path that the Moon can pass in front of it and the planets pass near it. The Sun goes by around mid November, and for weeks either side it is lost in the glare. From 50° north it is above the horizon for about 7 hours a day, from 35° north about 9 and from 35° south about 15. It is 20° from the plane of the Milky Way.