Linked Questions

5
votes
3answers
860 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 ...
1
vote
0answers
139 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....
0
votes
3answers
1k 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 ...
11
votes
3answers
304 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 ...
2
votes
2answers
280 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 ...
9
votes
1answer
253 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 ...
5
votes
1answer
348 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 ...
3
votes
2answers
1k 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 ...
2
votes
3answers
368 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 ...
3
votes
1answer
305 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: ...
3
votes
1answer
271 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 ...
5
votes
1answer
223 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 ...
4
votes
1answer
126 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?
4
votes
0answers
78 views

Sun (star) spots (size)

My question is about sunspots size. Does these spots have a 'typical' size for all kinds of stars (dwarves or super giants), or are they dependent on a star size? In another words, is the statement ...