← Back to dex - Centaur: adrift between the giants +20
- Has a proper name +8
- Kuiper-belt object +5
Total score 33
1 more point to reach Rare.
Badges
- ❄️ Kuiper-belt object · +5
- 🏷️ Has a proper name · +8
- 🦌 Centaur: adrift between the giants · +20
✨ Trivia
What it actually is
- 🛸 Its orbit family. A centaur, wandering between the orbits of Jupiter and Neptune on a path nothing can stabilise. Half asteroid and half comet, and gone from this orbit within a few million years.
- 🌞 Closest approach. At its nearest it comes within 6.01 AU of the Sun — inside the orbit of Saturn.
- 🔁 One lap. A single orbit around the Sun takes it about 35.4 years.
- 🥏 How far it roams. Its orbit swings between 6.01 and 15.55 AU from the Sun.
Sense of scale
- 🧱 Sense of scale. In everyday terms it is roughly 2.6× the height of Mount Everest.
- 🚶 Walk around it. Walking its equator at a steady pace, eight hours a day, would take about 1.8 days.
By the numbers
- 📐 Size. Roughly 23.2 km across.
What's in a name
- 🏷️ Named. Notable enough to have earned a proper name, not just a catalogue number.
Properties
- albedo
- 0.062
- aphelion au
- 15.56
- designation
- 346889
- diameter km
- 23.2
- eccentricity
- 0.4427
- full name
- 346889 Rhiphonos (2009 QV38)
- h mag
- 12
- inclination
- 19.9
- mean motion deg day
- 0.0278
- moid au
- 5.02
- name
- Rhiphonos
- named
- yes
- orbit class
- CEN
- perihelion au
- 6.009
- semi major au
- 10.78
About Rhiphonos
Rhiphonos is an uncommon kbo. It swings within 6.009 AU of the Sun at perihelion.
A centaur, wandering between the orbits of Jupiter and Neptune on a path nothing can stabilise. Half asteroid and half comet, and gone from this orbit within a few million years.
How to see it
Like any astronomical target, Rhiphonos 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. Because it moves against the background stars, the live position panel on this page tracks where it is right now. The visibility panel above works out tonight's viewing window for your saved location.
Why Rhiphonos is an uncommon kbo
Rhiphonos scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.
That score comes from 3 science badges — Kuiper-belt object, Has a proper name and Centaur: adrift between the giants — 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.