About HIP 72342
HIP 72342 is a common variable star. It sits in the constellation Boo, shines at apparent magnitude 10.61 and has spectral type F2.
Its spectrum reads F2 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Common variable star 15 EP
HIP 72342
RA 221.8969° · Dec 16.8454° · star
Score breakdown
· 4 badgesCommon 22 pts → Uncommon
- Variable star +5
- Gently variable +4
- Yellow-white F-type star +3
- A named variable star +3
Total score 15
7 more points to reach Uncommon.
Badges
- Variable star · +5
- Yellow-white F-type star · +3
- Gently variable · +4
- A named variable star · +3
Trivia
Hard to believe
- True brightness. It pours out about 487.5 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 F2 — 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 10.6 you'll want a small backyard telescope, over in Boötes.
- 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 May — that's when to go looking.
Its true colour
- Its true colour. Measured through blue and visual filters it comes out brilliant white (B−V 0.2) — hotter and whiter than the Sun, the colour of Sirius or Vega.
- Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.
Properties
- absmag
- -9.39
- bv
- 0.22
- constellation
- Boo
- luminosity
- 496592.3215
- mag
- 10.61
- name
- HIP 72342
- spect
- F2
- var amplitude
- 0.47
- var designation
- AE
- var max
- 10.43
- var min
- 10.9
How to see it
Look for HIP 72342 in the constellation Boo. At apparent magnitude 10.61, a small backyard telescope will bring it into view.
Like any astronomical target, HIP 72342 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 72342 is a common variable star
HIP 72342 scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 7 points would lift it into a rarer tier.
That score comes from 4 science badges — Variable star, Yellow-white F-type star, Gently 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.