<p>The American Association of Variable Star Observers tracks observations of a number of variable stars, <a href="https://www.aavso.org/apps/webobs/results/?star=Betelgeuse" rel="noreferrer">including Betelgeuse</a>. There are typically many such observations each day, primarily at visible wavelengths. It's quite easy to <a href="https://www.aavso.org/LCGv2/" rel="noreferrer">generate a light curve</a> in the band(s) and date range of your choice.</p>

<p>I'm also aware of <a href="https://twitter.com/betelbot" rel="noreferrer">a Twitter bot</a> that tweets light curves from AAVSO data several times a day, including long-term projections, but I assume you'd be more interested in looking at the individual measurements yourself.</p>

CC BY-SA 4.0
2020-02-19T12:06:39.753Z
There's quite a bit of variation in the measurements, though, e.g. from 0.423 to 3.3151. Is this expected?
Eric Duminil
CC BY-SA 4.0
2020-02-19T14:44:54.347Z
@EricDuminil One of those is in the R band and one of those is in the B band, so it's not surprising. Different wavelength filters will give different magnitudes for a particular object.
HDE 226868
CC BY-SA 4.0
2020-02-18T05:35:58.090Z
2020-02-18T05:35:58.090Z
HDE 226868
<p>I tried searching on the internet and could not find anything, so does anyone know if there's a website which tracks and shows Betelgeuse's magnitude daily?  I just went out today and saw that it's now about the same brightness as Bellatrix.</p>

CC BY-SA 4.0
2020-02-18T15:44:49.400Z
In addition to the answer, you might also find this article interesting as it chimes with your observation: https://astronomynow.com/2020/02/14/esos-very-large-telescope-shows-dramatic-dimming-of-betelgeuse/
MartynA
CC BY-SA 4.0
2020-02-19T20:11:30.940Z
The website from the [American Association of Variable Star Observers](https://www.aavso.org/star-month-february-2020-alpha-ori) has info about the magnitude variations of Betelgeuse in its "Star of the Month" article.
Maurizio
<betelgeuse>
Daily magnitude of Betelgeuse
hamayoun
# Daily magnitude of Betelgeuse

(Asked by: username_0 on 2020-02-18)

I tried searching on the internet and could not find anything, so does anyone know if there's a website which tracks and shows Betelgeuse's magnitude daily? I just went out today and saw that it's now about the same brightness as Bellatrix.

**Tags:** betelgeuse

> **Comments:**
> **username_1**: In addition to the answer, you might also find this article interesting as it chimes with your observation: https://astronomynow.com/2020/02/14/esos-very-large-telescope-shows-dramatic-dimming-of-betelgeuse/  
> **username_2**: The website from the [American Association of Variable Star Observers](https://www.aavso.org/star-month-february-2020-alpha-ori) has info about the magnitude variations of Betelgeuse in its "Star of the Month" article.  

---

## 1 answers

### Answer by username_3 on 2020-02-18. Score: 17 | Accepted answer

The American Association of Variable Star Observers tracks observations of a number of variable stars, [including Betelgeuse](https://www.aavso.org/apps/webobs/results/?star=Betelgeuse). There are typically many such observations each day, primarily at visible wavelengths. It's quite easy to [generate a light curve](https://www.aavso.org/LCGv2/) in the band(s) and date range of your choice.

I'm also aware of [a Twitter bot](https://twitter.com/betelbot) that tweets light curves from AAVSO data several times a day, including long-term projections, but I assume you'd be more interested in looking at the individual measurements yourself.

> **Comments:**
> **username_4**: There's quite a bit of variation in the measurements, though, e.g. from 0.423 to 3.3151. Is this expected?  
> **username_3**: @EricDuminil One of those is in the R band and one of those is in the B band, so it's not surprising. Different wavelength filters will give different magnitudes for a particular object.  

---

