About HD 99492 b
HD 99492 b is a common exoplanet. It lies about 59.4 light-years from Earth, has an equilibrium temperature near 622 K, spans roughly 5.44 Earth radii and weighs about 25.5 Earth masses.
One of at least 2 planets orbiting its star.
Common exoplanet 15 EP
HD 99492 b
RA 171.6897° · Dec 3.0071° · exoplanet
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Multi-planet system +6
- Confirmed exoplanet +5
- Neptune-like +4
Total score 15
9 more points to reach Uncommon.
Badges
- Confirmed exoplanet · +5
- Neptune-like · +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. ≈ 1 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 92.7 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 594 years in a starship at a tenth of light speed.
- Distance. 59.4 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1967.
Saying hello
- Say hello. A radio message and its reply would take 119 years round-trip.
Standing on it
- A year here. A full year lasts just 17.1 Earth days.
By the numbers
- Size. About 5.4× the width of Earth.
- Volume. About 161 Earths could fit inside it.
- Mass. About 25.5× the mass of Earth.
- Your weight. You'd weigh about 0.9× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
- Temperature. A scorching 349°C on average.
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
- 0.87
- discovery facility
- W. M. Keck Observatory
- discovery method
- Radial Velocity
- dist ly
- 59.3728
- eccentricity
- 0.034
- eq temp k
- 622.27
- insolation
- 23.2671
- mass earth
- 25.5
- name
- HD 99492 b
- orbital period days
- 17.0503
- radius earth
- 5.44
- sys num planets
- 2
How to see it
Like any astronomical target, HD 99492 b 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 99492 b is a common exoplanet
HD 99492 b 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, Neptune-like 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.