About HD 245199
HD 245199 is a common star. It sits in the constellation Tau, shines at apparent magnitude 9.41 and has spectral type F8.
Its spectrum reads F8 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Common star 17 EP
HD 245199
RA 83.9402° · Dec 20.4378° · star
Score breakdown
· 4 badgesCommon 22 pts → Uncommon
- Deep red star +8
- Star +3
- On the zodiac +3
- Yellow-white F-type star +3
Total score 17
5 more points to reach Uncommon.
Badges
- Star · +3
- On the zodiac · +3
- Yellow-white F-type star · +3
- Deep red star · +8
Trivia
Hard to believe
- True brightness. It pours out about 1.5 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 F8 — 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 9.4 you'll want a small backyard telescope, over in Taurus.
- 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 deep orange-red (B−V 1.4) — one of the coolest surfaces a star can have while still fusing.
By the numbers
- Surface temperature. Its colour puts the surface at roughly 3920 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
- -10.59
- bv
- 1.42
- constellation
- Tau
- luminosity
- 1499684.8355
- mag
- 9.41
- name
- HD 245199
- spect
- F8
Nearby objects
How to see it
Look for HD 245199 in the constellation Tau. At apparent magnitude 9.41, a small backyard telescope will bring it into view.
Like any astronomical target, HD 245199 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 245199 is a common star
HD 245199 scores 17 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, On the zodiac, Yellow-white F-type 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.