About HD 297731
HD 297731 is a trash star. It sits in the constellation Vel, shines at apparent magnitude 11.01 and has spectral type F2.
Its spectrum reads F2 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Trash star 6 EP
HD 297731
RA 150.4822° · Dec -49.3038° · star
Score breakdown
· 2 badgesTrash 15 pts → Common
- Star +3
- Yellow-white F-type star +3
Total score 6
9 more points to reach Common.
Badges
- Star · +3
- Yellow-white F-type star · +3
Trivia
Hard to believe
- True brightness. It pours out about 337.3 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 F2 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Find it in the sky
- How to spot it. At magnitude 11 you'll want a small backyard telescope, over in Vela.
- 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 February — 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 8750 K, against the Sun's 5778 K.
Properties
- absmag
- -8.99
- bv
- 0.13
- constellation
- Vel
- luminosity
- 343557.9479
- mag
- 11.01
- name
- HD 297731
- spect
- F2
How to see it
Look for HD 297731 in the constellation Vel. At apparent magnitude 11.01, a small backyard telescope will bring it into view.
Like any astronomical target, HD 297731 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 297731 is a trash star
HD 297731 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 Yellow-white F-type 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.