Star profile
Pi 1 Ursae Majoris
Variable starWhat is Pi 1 Ursae Majoris
Pi-1 Ursae Majoris is a discreet solar neighbour: a G0.5 yellow dwarf only 47 light-years away, with 90% of the Sun's mass and a radius nearly identical. Young —about 200 million years— it shows perceptible chromospheric activity that places it among the gentle variables of the catalogue. To look at it is to look at a Sun like ours, only much younger.
Where it is and when to see it
Pi 1 Ursae Majoris lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is January, when it culminates around midnight.
- From London it never sets and culminates about 76° up.
- From New York it never sets and culminates about 66° up.
- From Sydney it never rises above the horizon.
It can be seen from anywhere north of 25° S.
It ranks no. 76 in brightness among the 124 stars of Ursa Major in our catalogue. To find it, start from Alioth, the brightest: it lies about 31° away (a fist at arm's length covers about 10°).
The light you see today left it about 47 years ago.
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Astronomical data for Pi 1 Ursae Majoris
- Constellation
- Ursa Major
- Apparent magnitude
- 5.63
- Distance
- 46.8 light years
- Coordinates (J2000)
- RA 129.799° · Dec 65.021°
- Catalogue
- HIP 42438 · HD 72905
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Other stars in Ursa Major
Ursa Major has 124 stars in Stelvia's catalogue. Here are a few of them.
- AliothEpsilon Ursae Majoris1.76
- DubheAlpha Ursae Majoris1.81
- AlkaidEta Ursae Majoris1.85
- 42 Ursae Majoris5.57
- HIP 586545.59
- 81 Ursae Majoris5.60
- HIP 565105.63
- HIP 423725.66