Free planetarium

 
User avatar
Watsisname
Science Officer
Science Officer
Posts: 928
Joined: 06 Sep 2016
Location: Bellingham, WA

Science and Astronomy News

27 Oct 2017 05:11

DoctorOfSpace wrote:
Source of the post Watsisname, it's on a collision course with the Earth but don't worry the shadow government sent a special team with a hyperdrive generator and it will take a path through hyperspace when it intersects the Earth.

Neat!
 
User avatar
JackDole
World Builder
World Builder
Posts: 602
Joined: 02 Nov 2016
Location: Terra

Science and Astronomy News

27 Oct 2017 06:31

It is Rama (Rendezvous with Rama).
 
User avatar
Gnargenox
Pioneer
Pioneer
Posts: 379
Joined: 11 Dec 2016
Location: 179° 56′ 39.4″ +0° 2′ 46.2″ @ 7,940 ± 420 pc

Science and Astronomy News

27 Oct 2017 11:05

DoctorOfSpace wrote:
Source of the post it's on a collision course with the Earth but don't worry the shadow government sent a special team with a hyperdrive generator and it will take a path through hyperspace when it intersects the Earth.

Just like Prometheus can travel directly through Mimas shown here:
mimas_prometheus_rings_anim.gif
CPU: AMD FX-8350 8 core processor 4GHz / GPU: GeForce GT 730 @ 1920x1080, 60Hz with 1GB adapter RAM / RAM: Patriot Signature 4GB 1600MHz 240-Pin DDR3 (only 2GB work, don't buy it) / Motherboard: MSI 970 Gaming MS-7693
 
User avatar
Gnargenox
Pioneer
Pioneer
Posts: 379
Joined: 11 Dec 2016
Location: 179° 56′ 39.4″ +0° 2′ 46.2″ @ 7,940 ± 420 pc

Science and Astronomy News

02 Nov 2017 22:03

ALMA has detected a cold debris disk around Proxima Centauri with a mass comparable to that of the Kuiper Belt in our own solar system.

The disk is 1-4 AU from the star, which given the low luminosity of Proxima Centuri, means that it's roughly the same temperature as our Kuiper Belt, and may represent a sort of "Kuiper Belt analogue." The data hints at a possible outer debris belt at ~30 AU as well as warm dust at around 0.4 AU. But these will need more data to confirm.

Interestingly, a marginally detected compact source at ~1.6 AU, assuming it's not noise or a background object, may indicate the presence of a second planet orbiting Proxima Centauri. For a single body to be producing the signal in the ALMA data, it would have to be a ~1000 K brown dwarf, which can be confidently ruled out. Alternatively, this may represent a cloud of dust trapped in the Lagrange point of an as-yet undetected planet. Another possibility is that ALMA is seeing a ring of dust around a giant planet at 1.6 AU (with an orbital period of 5.8 years). The rings would have to have a mass of ~10^-5 Earth-masses, compared to 10^-7 Earth-masses for Saturn. Since the RV data likely rules out a ~100 Earth-mass planet at 1.6 AU, we would be talking about an extremely massive planetary ring around a rather low-mass planet (compared to Saturn at least). Further observations will be necessary to confirm that this emission source even exists, and if it does, that it orbits Proxima Centauri. "At any rate, our study shows that ALMA provides already the necessary sensitivity and resolution to detect rings around exoplanets in Alpha Centauri, and perhaps in other nearby stars."

ALMA Discovery of Dust Belts Around Proxima Centauri
1.jpg


ALMA Discovery of Dust Belts Around Proxima Centauri
CPU: AMD FX-8350 8 core processor 4GHz / GPU: GeForce GT 730 @ 1920x1080, 60Hz with 1GB adapter RAM / RAM: Patriot Signature 4GB 1600MHz 240-Pin DDR3 (only 2GB work, don't buy it) / Motherboard: MSI 970 Gaming MS-7693
 
User avatar
FastFourierTransform
Space Pilot
Space Pilot
Posts: 123
Joined: 17 Nov 2016

Science and Astronomy News

03 Nov 2017 07:00

WOW!!!
This is awesome news! thank you :D

A very important thing not mentioned is that we currently don't know the mass of Proxima b because the inclination of its orbital plane is unknown and thus we only have an estimate of the minimum mass of the planet. But assuming that those belts are coplanar with Proxima b orbit (as the Kuiper and main belts are with the ecliptic) then studying them would allow to meassure the precise mass of the planet! and this would result in knowing the kind of planet we have found (rocky, gas giant, etc...). So this discovery of the belts allow for a better understanding on the habitability of Proxima b as a consequence.

Okay, now I've seen that the scientific paper mentions this. If the outer belt is real then it has an aproximate inclination of i=45º. We also know that the minimum mass estimate for Proxima b is 1.27 earth masses.

Therefore Proxima b has around 1.8 earth masses in reality. By definition this could make it a very small super-earth or an earth-like planet.
 
User avatar
Gnargenox
Pioneer
Pioneer
Posts: 379
Joined: 11 Dec 2016
Location: 179° 56′ 39.4″ +0° 2′ 46.2″ @ 7,940 ± 420 pc

Science and Astronomy News

03 Nov 2017 12:51

FastFourierTransform wrote:
Source of the post This is awesome news! thank you

My pleasure! :)

They say that the still-to-be-confirmed, outermost belt is tilted by 45 deg, but not the others. As such, and even if the sketch and the animation assume coplanarity of the three belts, it seems not to be observationally established.

Any assumptions about the true mass at this point rely on that assumption. There's no way to know for sure at this point. The confidently detected disk's inclination is unknown, just inferred by coplanarity from the uncertainly-detected outer disk. Which makes the inclination of Proxima Centauri b a lot less certain.

However, if the innermost belt (~10 times farther than Prox b) was confirmed and if the position of its inner and outer boundary were well enough constrained, we could certainly have some constraints on the planet's mass. The constraints would certainly be far weaker if we have to rely on the confidently detected, intermediate belt. Or, more exactly, we could have constraints on the (mass, inclination) parameter. If you are talking about modelling the inner disk edge from the spectral energy distribution, you have to assume the b planet is alone to assume it's mass is responsible for shaping the inner disk wall. If the latter, you can probably infer the inclination, and the HARPS/Red Dots campaign does suggest a second planet is in the system at < 100ish days.
CPU: AMD FX-8350 8 core processor 4GHz / GPU: GeForce GT 730 @ 1920x1080, 60Hz with 1GB adapter RAM / RAM: Patriot Signature 4GB 1600MHz 240-Pin DDR3 (only 2GB work, don't buy it) / Motherboard: MSI 970 Gaming MS-7693
 
alfa015
Space Tourist
Space Tourist
Posts: 23
Joined: 26 Jul 2017

NEW: Earth-like exoplanet found orbiting the star Ross 128

16 Nov 2017 13:16

Hi guys! exciting news, probably the most important discovery of the year 

Astronomers from the European Southern Observatory have found the second potentially habitable exoplanet closest to Earth, located at only 11 light years away. I made an analysis on it: https://youtu.be/QkRgGRHA4ao?list=PL3Ri ... GtUGEOankw

As if this were not enough, on May 2017, astronomers from the SETI Institute detected unusual radio signals coming from Ross 128 

What do you think? Do you think that the exoplanet Ross 128 b hosts intelligent life? If so, why?
 
User avatar
DoctorOfSpace
World Builder
World Builder
Posts: 920
Joined: 22 Aug 2016
Location: SpaceX Mars Colony
Contact:

NEW: Earth-like exoplanet found orbiting the star Ross 128

16 Nov 2017 13:19

alfa015, we have a thread dedicated to news and information like that

CPU: Intel Core i7-5820K 4.2GHz 6-Core Processor - RAM: G.Skill Ripjaws V Series 32GB (4 x 8GB) DDR4-2400 - GPU: EVGA GeForce GTX 1080 Ti SC Black Edition
Quando omni flunkus, moritati

Who is online

Users browsing this forum: No registered users and 1 guest