Update on C/2019Y4 April 7, 2020
(See all updates by clicking on the comets icon at the top of my home page)
Readers may remember that I wrote about this comet:
So, you were warned – and that last part may well be happening now. Below is a collection of all photometric (CCD) observations of Comet 2019Y4 from March 7. Below that is a graph of the distance from the comet to the Sun (orange) and from the comet to Earth (blue) for the same period. The distances are in Astronomical Units – the distance from the Earth to the Sun – about 93 Million miles
You see that:
* The comet was brightening until about April first. Then it declined rapidly until today April 7th.
* In that time, it has gotten closer to the sun, which illuminates the comet better than before and closer to the Earth – where we should see it brighter than before – even without the additional illumination by the Sun.
* See the Conclusions below the charts
- One expects a comet to lose mass as it is blown away by the solar wind – that is what makes the “tail”. That would cause a dimming due to a smaller reflective surface and smaller “gas ball” surrounding. This will be offset by brightening by being nearer to the Sun and Earth.
- In this case, the dimming is faster than the brightening due to being nearer. The comet is probably wasting away quickly – on its way to disappearing for good.
- But, I could be wrong. 🙂
- Hasta Luego, Steve
P.S. If you have any questions please use the comments section (Leave a Reply) below and I will answer for all the readers who may have had the same question. Thanks SBC