Star profile
39 Boötis
What is 39 Boötis
39 Boötis sits in the Herdsman at 224 light-years, an F-type star hotter and whiter than the Sun. Its light departed in the late eighteenth century, when the first truly modern measuring instruments were being refined. Magnitude 5.68 — modest in brightness, yet the Hipparcos satellite pinned it precisely on the three-dimensional map of the solar neighbourhood.
Where it is and when to see it
39 Boötis lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is April, when it culminates around midnight.
- From London it never sets and culminates about 87° up.
- From New York it culminates about 82° above the horizon.
- From Sydney it culminates about 7° above the horizon.
It can be seen from anywhere north of 41° S.
It ranks no. 59 in brightness among the 88 stars of Boötes in our catalogue. To find it, start from Arcturus, the brightest: it lies about 30° away (a fist at arm's length covers about 10°).
The light you see today left it about 220 years ago.
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Astronomical data for 39 Boötis
- Constellation
- Boötes
- Apparent magnitude
- 5.68
- Distance
- 223.7 light years
- Coordinates (J2000)
- RA 222.422° · Dec 48.721°
- Catalogue
- HIP 72524 · HD 131041
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Other stars in Boötes
Boötes has 88 stars in Stelvia's catalogue. Here are a few of them.
- ArcturusAlpha Boötis-0.05
- IzarEpsilon Boötis2.35
- MuphridEta Boötis2.68
- 40 Boötis5.64
- HIP 750435.65
- 46 Boötis5.67
- 7 Boötis5.71
- HIP 664175.72