About HIP 100299
HIP 100299 is an uncommon star. It sits in the constellation Sgr, shines at apparent magnitude 10.32 and has spectral type G2.
Its spectrum reads G2 — a G-type star: the very same spectral class as our own Sun.
Uncommon star 22 EP
HIP 100299
RA 305.1334° · Dec -33.3135° · star
Score breakdown
· 4 badgesUncommon 34 pts → Rare
- Toward the galactic centre +8
- Sun-like G-type star +8
- Star +3
- On the zodiac +3
Total score 22
12 more points to reach Rare.
Badges
- Star · +3
- Toward the galactic centre · +8
- On the zodiac · +3
- Sun-like G-type star · +8
Trivia
Hard to believe
- True brightness. It pours out about 636.8 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 G2 — a G-type star: the very same spectral class as our own Sun.
Find it in the sky
- How to spot it. At magnitude 10.3 you'll want a small backyard telescope, over in Sagittarius.
- 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 July — 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 4340 K, against the Sun's 5778 K.
What's in a name
- Its catalogue. The HIP number comes from Hipparcos, the ESA satellite that between 1989 and 1993 pinned down 118,000 stars precisely enough to triangulate their distances.
Properties
- absmag
- -9.68
- bv
- 1.184
- constellation
- Sgr
- luminosity
- 648634.4335
- mag
- 10.32
- name
- HIP 100299
- spect
- G2
Nearby objects
How to see it
Look for HIP 100299 in the constellation Sgr. At apparent magnitude 10.32, a small backyard telescope will bring it into view.
Like any astronomical target, HIP 100299 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 HIP 100299 is an uncommon star
HIP 100299 scores 22 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 12 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Toward the galactic centre, On the zodiac and Sun-like G-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.