About IC 4685
IC 4685 is an uncommon nebula. It sits in the constellation Sgr.
A nebula: a cloud of interstellar gas and dust, thinner than the best vacuum ever made in a laboratory yet spanning light-years.
Uncommon nebula 30 EP
IC 4685
RA 272.3229° · Dec -23.9872° · openngc
Score breakdown
· 5 badgesUncommon 34 pts → Rare
- Nebula +8
- Toward the galactic centre +8
- Diffuse nebula +6
- Big on the sky +5
- On the zodiac +3
Total score 30
4 more points to reach Rare.
Badges
- Nebula · +8
- Diffuse nebula · +6
- Toward the galactic centre · +8
- On the zodiac · +3
- Big on the sky · +5
Trivia
What it actually is
- What it actually is. A nebula: a cloud of interstellar gas and dust, thinner than the best vacuum ever made in a laboratory yet spanning light-years.
Find it in the sky
- Where to look. You'll find it in the constellation 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 June — that's when to go looking.
Its true colour
- Its true colour. Nebular colours are chemistry made visible — red for hydrogen, teal for oxygen, blue where starlight is merely scattered.
How we came to know it
- The Index Catalogue. The IC was the 1895 and 1908 supplement to the NGC — the first catalogue in history to be filled largely with objects found on photographic plates rather than by eye.
Properties
- constellation
- Sgr
- dso type
- Neb
- name
- IC 4685
- size arcmin
- 15
Nearby objects
- Rare HD 165921 variable star · <0.1° away
- Uncommon NGC 6559 nebula · 0.2° away
- Uncommon IC 1275 nebula · 0.3° away
- Rare IC 1274 nebula · 0.4° away
- Uncommon HD 314031 star · 0.4° away
- Uncommon J1809-2332 pulsar · 0.5° away
- Uncommon HD 314027 variable star · 0.5° away
- Epic J1811-2405 pulsar · 0.5° away
How to see it
Look for IC 4685 in the constellation Sgr.
Like any astronomical target, IC 4685 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 IC 4685 is an uncommon nebula
IC 4685 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.
That score comes from 5 science badges — Nebula, Diffuse nebula, Toward the galactic centre, On the zodiac and Big on the sky — 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.