About HD 57884
HD 57884 is a trash star. It sits in the constellation Mon, shines at apparent magnitude 9.01 and has spectral type N0.
Its spectrum reads N0 — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
Trash star 11 EP
HD 57884
RA 110.7791° · Dec -4.2136° · star
Score breakdown
· 2 badgesTrash 15 pts → Common
- Deep red star +8
- Star +3
Total score 11
4 more points to reach Common.
Badges
- Star · +3
- Deep red star · +8
Trivia
Hard to believe
- True brightness. It pours out about 2.1 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 N0 — 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 9 you'll want a small backyard telescope, over in Monoceros.
- Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
- Best time of year. It stands highest in the middle of the night around January — that's when to go looking.
Its true colour
- Its true colour. Measured through blue and visual filters it comes out deep orange-red (B−V 2.3) — one of the coolest surfaces a star can have while still fusing.
By the numbers
- Surface temperature. Its colour puts the surface at roughly 2890 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
- -10.99
- bv
- 2.297
- constellation
- Mon
- luminosity
- 2167704.1048
- mag
- 9.01
- name
- HD 57884
- spect
- N0
How to see it
Look for HD 57884 in the constellation Mon. At apparent magnitude 9.01, a small backyard telescope will bring it into view.
Like any astronomical target, HD 57884 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 57884 is a trash star
HD 57884 scores 11 points on Spacedle's rarity scale, which places it in the trash tier. Another 4 points would lift it into a rarer tier.
That score comes from 2 science badges — Star and Deep red 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.