About HD 242509
HD 242509 is a trash star. It sits in the constellation Ori, shines at apparent magnitude 11.06 and has spectral type F0V.
Its spectrum reads F0V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Trash star 14 EP
HD 242509
RA 79.6975° · Dec 15.1055° · star
Score breakdown
· 4 badgesTrash 15 pts → Common
- In Orion's hunting ground +6
- Star +3
- Yellow-white F-type star +3
- Main-sequence star +2
Total score 14
1 more point to reach Common.
Badges
- Star · +3
- In Orion's hunting ground · +6
- Yellow-white F-type star · +3
- Main-sequence star · +2
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.
What it actually is
- Spectral class. Its spectrum reads F0V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
- Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
Find it in the sky
- How to spot it. At magnitude 11.1 you'll want a small backyard telescope, over in Orion.
- 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 0.5) — 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.
Properties
- absmag
- -8.94
- bv
- 0.511
- constellation
- Ori
- luminosity
- 328095.2931
- mag
- 11.06
- name
- HD 242509
- spect
- F0V
How to see it
Look for HD 242509 in the constellation Ori. At apparent magnitude 11.06, a small backyard telescope will bring it into view.
Like any astronomical target, HD 242509 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 242509 is a trash star
HD 242509 scores 14 points on Spacedle's rarity scale, which places it in the trash tier. Another 1 point would lift it into a rarer tier.
That score comes from 4 science badges — Star, In Orion's hunting ground, Yellow-white F-type star and Main-sequence 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.