About HD 100943
HD 100943 is a trash star. It sits in the constellation Cen and shines at apparent magnitude 7.13.
Its colour puts the surface at roughly 9200 K, against the Sun's 5778 K.
Trash star 3 EP
HD 100943
RA 174.1182° · Dec -61.6651° · star
Score breakdown
· 1 badgeTrash 15 pts → Common
- Star +3
Total score 3
12 more points to reach Common.
Badges
- Star · +3
Trivia
Find it in the sky
- How to spot it. At magnitude 7.1 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Centaurus.
- Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
- Best time of year. It stands highest in the middle of the night around March — 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 0.1) — 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.
By the numbers
- Surface temperature. Its colour puts the surface at roughly 9200 K, against the Sun's 5778 K.
What's in a name
- Its catalogue. The HD number is from the Henry Draper Catalogue, in which Annie Jump Cannon personally classified the spectra of nearly 400,000 stars — still the largest such feat by one person.
Properties
- absmag
- -12.87
- bv
- 0.083
- constellation
- Cen
- luminosity
- 12246161.9927
- mag
- 7.13
- name
- HD 100943
Nearby objects
- Uncommon HD 306798 variable star · <0.1° away
- Rare HD 306799 star · <0.1° away
- Common HD 306797 variable star · <0.1° away
- Rare Pearl Cluster cluster · <0.1° away
- Rare HIP 56556 variable star · 0.1° away
- Uncommon HD 100840 star · 0.1° away
- Uncommon HR 4487 star · 0.3° away
- Common HR 4475 star · 0.4° away
How to see it
Look for HD 100943 in the constellation Cen. At apparent magnitude 7.13, it is an easy target for binoculars.
Like any astronomical target, HD 100943 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 100943 is a trash star
HD 100943 scores 3 points on Spacedle's rarity scale, which places it in the trash tier. Another 12 points would lift it into a rarer tier.
That score comes from 1 science badge — 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.