About HD 184001
HD 184001 is a rare star. It sits in the constellation Sgr, shines at apparent magnitude 9.19 and has spectral type G8II.
Its spectrum reads G8II — a G-type star: the very same spectral class as our own Sun.
Rare star 34 EP
HD 184001
RA 293.5279° · Dec -43.4643° · star
Score breakdown
· 5 badgesRare 50 pts → Epic
- Bright giant +12
- Toward the galactic centre +8
- Sun-like G-type star +8
- Star +3
- On the zodiac +3
Total score 34
16 more points to reach Epic.
Badges
- Star · +3
- Toward the galactic centre · +8
- On the zodiac · +3
- Sun-like G-type star · +8
- Bright giant · +12
Trivia
Hard to believe
- True brightness. It pours out about 1.8 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 G8II — a G-type star: the very same spectral class as our own Sun.
- Where it is in life. It is a bright giant, well on its way to the largest stars there are.
Find it in the sky
- How to spot it. At magnitude 9.2 you'll want a small backyard telescope, over in Sagittarius.
- 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 July — 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) — cooler than the Sun, and the kind of star that burns steadily for tens of billions of years.
- 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
- -10.81
- bv
- 0.991
- constellation
- Sgr
- luminosity
- 1836538.3433
- mag
- 9.19
- name
- HD 184001
- spect
- G8II
How to see it
Look for HD 184001 in the constellation Sgr. At apparent magnitude 9.19, a small backyard telescope will bring it into view.
Like any astronomical target, HD 184001 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 184001 is a rare star
HD 184001 scores 34 points on Spacedle's rarity scale, which places it in the rare tier. Another 16 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Toward the galactic centre, On the zodiac, Sun-like G-type star and Bright giant — 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.