About HIP 91015
HIP 91015 is a common variable star. It sits in the constellation Lyr, shines at apparent magnitude 12.01 and has spectral type FOp.
Its spectrum reads FOp — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Common variable star 21 EP
HIP 91015
RA 278.4892° · Dec 31.6400° · star
Score breakdown
· 4 badgesCommon 22 pts → Uncommon
- Strongly variable +10
- Variable star +5
- Yellow-white F-type star +3
- A named variable star +3
Total score 21
1 more point to reach Uncommon.
Badges
- Variable star · +5
- Yellow-white F-type star · +3
- Strongly variable · +10
- A named variable star · +3
Trivia
Hard to believe
- True brightness. It pours out about 134.3 thousand times as much light as the Sun. It only looks ordinary because it is so far away.
What it actually is
- Spectral class. Its spectrum reads FOp — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
- It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.
Find it in the sky
- How to spot it. At magnitude 12 it is far too faint for the eye: this one belongs to cameras and long exposures, over in Lyra.
- Northern sky. It rides the northern half of the sky — an easier target the further north you are.
- Best time of year. It stands highest in the middle of the night around June — that's when to go looking.
What's in a name
- Its catalogue. The HIP number comes from Hipparcos, the ESA satellite that between 1989 and 1993 pinned down 118,000 stars precisely enough to triangulate their distances.
How we came to know it
- Cosmic yardstick. Variable stars are how we measured the universe. In 1912 Henrietta Leavitt showed that a pulsating star's rhythm reveals its true brightness — turning these stars into distance markers.
Properties
- absmag
- -7.99
- constellation
- Lyr
- luminosity
- 136772.8826
- mag
- 12.01
- name
- HIP 91015
- spect
- FOp
- var amplitude
- 0.85
- var designation
- CC
- var max
- 11.632
- var min
- 12.482
How to see it
Look for HIP 91015 in the constellation Lyr. At apparent magnitude 12.01, it takes a larger telescope or a long-exposure image to capture.
Like any astronomical target, HIP 91015 is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.
Why HIP 91015 is a common variable star
HIP 91015 scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.
That score comes from 4 science badges — Variable star, Yellow-white F-type star, Strongly variable and A named variable star — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.