Linked Questions

6 votes
3 answers
2k views

What's the correct distance to Betelgeuse? [duplicate]

Reading [1], [2] and this smartphone app[3], I'm getting different answers to the question. The smartphone app is stating 427ly. [1] states approx. 700 ly, and [2] states approx. 724ly. Even if I ...
ewokx's user avatar
  • 163
1 vote
0 answers
206 views

Why does Stellarium tell such imprecise distance for Betelgeuse? [duplicate]

The newest version of Stellarium, as well as the former ones, tell that Betelgeuse would be 497.95 ly plus/minus 56 ly away. Celestia also lists Betelgeuse ~500 ly away, but Celestia is comparably old....
Ioannes's user avatar
  • 1,090
1 vote
3 answers
14k views

If Betelgeuse is exploding in 2022, why would we see the explosion in 2022?

I have heard a lot about Betelgeuse exploding in 2022. But, I had a doubt about this. Astronomers are still receiving signals from Betelgeuse. And if Betelgeuse is going to explode in 2022, then ...
Ishaan Manish's user avatar
9 votes
2 answers
3k views

What would Betelgeuse look like from Earth if it was at the edge of the Solar System

If we parked Betelgeuse just outside the Solar System, how big would it look from Earth?
Jordan's user avatar
  • 388
12 votes
3 answers
423 views

What else could the Event Horizon Telescope Observe?

The Event Horizon Telescope was made possible in order to observe the details of supermassive black holes. This took a huge amount of work installing extra telescopes and developing the hardware and ...
Steve Linton's user avatar
  • 10.3k
2 votes
2 answers
361 views

Betelgeuse in false colors, is this common?

First, take the original Betelgeuse image from ALMA and remove red and green channels. Then boost the blue channel luminosity by x10 to x20 and a lot of detail pops out. This is the resulting image ...
pid's user avatar
  • 123
10 votes
1 answer
424 views

Can New Horizons be used to measure the distance to Betelgeuse (despite its fickle photocenter)?

The New Horizons spacecraft is almost 50 AU from Earth and near-simultaneous images taken by its telescope and one on Earth have demonstrated parallax without relying on the movement of Earth in it's ...
uhoh's user avatar
  • 30.7k
6 votes
1 answer
466 views

Why can't the surfaces of stars be observed?

If I'm correctly informed, only three stars: Sol, Betelgeuse and Altair have surfaces which have been resolved by telescopes. All other stars are only point sources of light, even in the greatest of ...
LocalFluff's user avatar
  • 11.4k
3 votes
2 answers
3k views

What is the maximum distance measurable with parallax? [duplicate]

What is the furthest star or celestial object whose distance has been calculated with parallax and how does it compare to the theoretical limit using today's telescopes? And how exactly does telescope ...
technical_difficulty's user avatar
2 votes
3 answers
434 views

How far have individual stars been seen by radio telescopes?

Writing this answer got me thinking. As far as I understand it, stars themselves radiate most of their energy at optical wavelengths (near-IR through near-UV). Various types of stellar objects may ...
uhoh's user avatar
  • 30.7k
3 votes
1 answer
425 views

How are SIMBAD's parallaxes calculated?

I've been trying to figure out how to convert parallax information from SIMBAD's database into parsecs. Looking at Wikipedia as well as many other sources, parallax is calculated as follows: ...
aggregate1166877's user avatar
3 votes
1 answer
350 views

What does the Sun "look like" below 100 MHz?

Radio2space.com's The Radio Sun says: At very low frequencies (below 0.1 GHz) and therefore at very long wavelengths (> 3m) the solar disk appears much bigger and brighter in the center, and its ...
uhoh's user avatar
  • 30.7k
5 votes
1 answer
293 views

Do stars have "radio photospheres"? Are they different from their optical photospheres?

Comments below What is the maximum distance measurable with parallax? discuss challenges associated with parallax measurements of Betelgeuse and link to Wikipedia’s Betelgeuse; Distance measurements ...
uhoh's user avatar
  • 30.7k
5 votes
1 answer
225 views

Would the Event Horizon Telescope be able to produce a superior image of Betelgeuse?

Current images of Betelgeuse are already amazing, but I was wondering if the EHT could be able to make a significantly better image, given that Betelgeuse is pretty big and pretty bright?
Ags1's user avatar
  • 394
5 votes
2 answers
234 views

What can be learned by observing tumbling asteroid 319 Leona passing in front of Betelgeuse's fickle photocenter? What campaigns have been organized?

There's a lot of interest in Betelgeuse party because of it's recent fainting behavior, and despite being so close, the huge uncertainty in it's distance due to its fickle photocenter: Can New ...
uhoh's user avatar
  • 30.7k

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