About HD 145777
HD 145777 is an uncommon star. It sits in the constellation Sco, shines at apparent magnitude 10.39 and has spectral type C.
Its spectrum reads C — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
Uncommon star 30 EP
HD 145777
RA 243.3078° · Dec -15.2003° · star
Score breakdown
· 3 badgesUncommon 34 pts → Rare
- Carbon star (sooty red) +24
- Star +3
- On the zodiac +3
Total score 30
4 more points to reach Rare.
Badges
- Star · +3
- On the zodiac · +3
- Carbon star (sooty red) · +24
Trivia
Hard to believe
- True brightness. It pours out about 597 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 C — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
Find it in the sky
- How to spot it. At magnitude 10.4 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 May — that's when to go looking.
Its true colour
- Its true colour. Measured through blue and visual filters it comes out orange (B−V 1.2) — 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 4400 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
- -9.61
- bv
- 1.153
- constellation
- Sco
- luminosity
- 608135.0013
- mag
- 10.39
- name
- HD 145777
- spect
- C
How to see it
Look for HD 145777 in the constellation Sco. At apparent magnitude 10.39, a small backyard telescope will bring it into view.
Like any astronomical target, HD 145777 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 145777 is an uncommon star
HD 145777 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, On the zodiac and Carbon star (sooty red) — 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.