About HD 99706 c
HD 99706 c is a common exoplanet. It lies about 478.1 light-years from Earth, spans roughly 12.8 Earth radii, weighs about 1,808.45 Earth masses and completes an orbit every 1,278 days.
One of at least 2 planets orbiting its star.
Common exoplanet 15 EP
HD 99706 c
RA 172.1262° · Dec 43.9662° · exoplanet
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Multi-planet system +6
- Confirmed exoplanet +5
- Gas giant +4
Total score 15
9 more points to reach Uncommon.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Multi-planet system · +6
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 8.4 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 746.6 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 4781 years in a starship at a tenth of light speed.
- Distance. 478 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1548.
Saying hello
- Say hello. A radio message and its reply would take 956 years round-trip.
Standing on it
- A year here. A full year lasts about 3.5 Earth years.
By the numbers
- Size. About 12.8× the width of Earth.
- Volume. About 2097 Earths could fit inside it.
- Mass. Roughly 1808× Earth's mass — about 5.7 Jupiters.
- Your weight. You'd weigh about 11.0× your Earth weight standing here.
How we found it
- Discovery. Found by W. M. Keck Observatory using the radial velocity method.
Cosmic context
- Crowded system. One of at least 2 planets orbiting its star.
Properties
- density gcc
- 4.74
- discovery facility
- W. M. Keck Observatory
- discovery method
- Radial Velocity
- dist ly
- 478.1447
- eccentricity
- 0.411
- mass earth
- 1808.4527
- name
- HD 99706 c
- orbital period days
- 1278
- radius earth
- 12.8
- sys num planets
- 2
How to see it
Like any astronomical target, HD 99706 c 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 99706 c is a common exoplanet
HD 99706 c scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 9 points would lift it into a rarer tier.
That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Multi-planet system — 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.