About HD 33723
HD 33723 is an uncommon star. It sits in the constellation Ori, shines at apparent magnitude 8.69 and has spectral type G8III.
Its spectrum reads G8III — a G-type star: the very same spectral class as our own Sun.
Uncommon star 23 EP
HD 33723
RA 78.0759° · Dec 1.3264° · star
Score breakdown
· 4 badgesUncommon 34 pts → Rare
- Sun-like G-type star +8
- In Orion's hunting ground +6
- Giant star +6
- Star +3
Total score 23
11 more points to reach Rare.
Badges
- Star · +3
- In Orion's hunting ground · +6
- Sun-like G-type star · +8
- Giant star · +6
Trivia
Hard to believe
- True brightness. It pours out about 2.9 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 G8III — a G-type star: the very same spectral class as our own Sun.
- Where it is in life. It is a giant. It has already exhausted its core hydrogen and swollen up enormously in response.
Find it in the sky
- How to spot it. At magnitude 8.7 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Orion.
- 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 December — 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.
Properties
- absmag
- -11.31
- bv
- 1.182
- constellation
- Ori
- luminosity
- 2910717.1181
- mag
- 8.69
- name
- HD 33723
- spect
- G8III
How to see it
Look for HD 33723 in the constellation Ori. At apparent magnitude 8.69, it is an easy target for binoculars.
Like any astronomical target, HD 33723 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 33723 is an uncommon star
HD 33723 scores 23 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 11 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, In Orion's hunting ground, Sun-like G-type star and Giant 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.