About HD 155651
HD 155651 is a common star. It sits in the constellation Sco, shines at apparent magnitude 9.53 and has spectral type G6IV/V.
Its spectrum reads G6IV/V — a G-type star: the very same spectral class as our own Sun.
Common star 19 EP
HD 155651
RA 258.5690° · Dec -31.2085° · star
Score breakdown
· 4 badgesCommon 22 pts → Uncommon
- Sun-like G-type star +8
- Subgiant (leaving the main sequence) +5
- Star +3
- On the zodiac +3
Total score 19
3 more points to reach Uncommon.
Badges
- Star · +3
- On the zodiac · +3
- Sun-like G-type star · +8
- Subgiant (leaving the main sequence) · +5
Trivia
Hard to believe
- True brightness. It pours out about 1.3 million 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 G6IV/V — a G-type star: the very same spectral class as our own Sun.
- Where it is in life. It is a subgiant, caught in the act of leaving the main sequence as the hydrogen in its core runs out.
Find it in the sky
- How to spot it. At magnitude 9.5 you'll want a small backyard telescope, over in Scorpius.
- Southern sky. It rides the southern half of the sky — an easier target the further south you are.
- Best time of year. It stands highest in the middle of the night around June — that's when to go looking.
Its true colour
- Its true colour. Measured through blue and visual filters it comes out orange (B−V 1.1) — cooler than the Sun, and the kind of star that burns steadily for tens of billions of years.
By the numbers
- Surface temperature. Its colour puts the surface at roughly 4560 K, against the Sun's 5778 K.
Properties
- absmag
- -10.47
- bv
- 1.08
- constellation
- Sco
- luminosity
- 1342764.9611
- mag
- 9.53
- name
- HD 155651
- spect
- G6IV/V
How to see it
Look for HD 155651 in the constellation Sco. At apparent magnitude 9.53, a small backyard telescope will bring it into view.
Like any astronomical target, HD 155651 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 HD 155651 is a common star
HD 155651 scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, On the zodiac, Sun-like G-type star and Subgiant (leaving the main sequence) — 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.