About HD 250757
HD 250757 is a trash star. It sits in the constellation Gem and shines at apparent magnitude 11.06.
Its colour puts the surface at roughly 6120 K, against the Sun's 5778 K.
Trash star 6 EP
HD 250757
RA 90.8420° · Dec 24.8233° · star
Score breakdown
· 2 badgesTrash 15 pts → Common
- Star +3
- On the zodiac +3
Total score 6
9 more points to reach Common.
Badges
- Star · +3
- On the zodiac · +3
Trivia
Hard to believe
- True brightness. It pours out about 322.1 thousand times as much light as the Sun. It only looks ordinary because it is so far away.
Find it in the sky
- How to spot it. At magnitude 11.1 you'll want a small backyard telescope, over in Gemini.
- 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 December — that's when to go looking.
Its true colour
- Its true colour. Measured through blue and visual filters it comes out yellow-white (B−V 0.6) — a shade brighter and crisper than our own Sun.
- 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 6120 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
- -8.94
- bv
- 0.561
- constellation
- Gem
- luminosity
- 328095.2931
- mag
- 11.06
- name
- HD 250757
How to see it
Look for HD 250757 in the constellation Gem. At apparent magnitude 11.06, a small backyard telescope will bring it into view.
Like any astronomical target, HD 250757 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 250757 is a trash star
HD 250757 scores 6 points on Spacedle's rarity scale, which places it in the trash tier. Another 9 points would lift it into a rarer tier.
That score comes from 2 science badges — Star and On the zodiac — 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.