| Object : | Comet, 103P Hartley 2 |
| Coordinates/Direction : | - |
| Object size : | - |
| Object magnitude : | - |
| More to know : |
You can read more about the comet here:
http://www.aerith.net/ comet/ catalog/ 0103P/2023.html
https://en.wikipedia.org/ wiki/ 103P/Hartley
|
| Exp. time : | 60x60 seconds at ISO1600, with dithering for every third image |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | bias cal, flat cal |
| Weather : | Clouds |
| Comment : |
Weather forecast was a clear sky, but when equipment was up and running there were many clouds.
The magnitude this night was 10.4.
|
| Mount : |
SkyWatcher EQ6 controlled by Astroberry |
| Guide : | Ekos internal guider in dithering mode, QHY5 camera with 200 mm f/3.5 lens |
| Lens/telescope : |
Pentax 645 300 mm ED f/4 (medium format lens) |
| Field (FOV) : | 6.8x4.5 degree |
| Filter : | none |
| Camera : |
Canon 6D, controlled by Astroberry software |
| Exp. time : | 60x60 seconds at ISO1600, with dithering for every third image |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | bias cal, flat cal, photo metric color calibration |
| Weather : | Clear Sky |
| Comment : |
At last, the comet is now bright enough to let me align the sub images on it. The magnitude is this night 10.7, it's a bit darker this night too.
|
| Exp. time : | 30x60 seconds at ISO1600, with dithering for every third image |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | bias cal, flat cal, photo metric color calibration |
| Weather : | Clear Sky |
| Comment : |
Twelve days later there was a new clear sky and I setup the equipment to catch the comet once again.
The magnitude has increased a bit, from 12.2 to 11.4.
From the light polluted balcony it's still difficult to recognize it, a diffuse green blob in center of photo.
|
| Exp. time : | 60x30 seconds at ISO1600, with dithering for every third image |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | bias cal, flat cal, photo metric color calibration |
| Weather : | Clear Sky, +14 degrees Celsius, full Moon |
| Comment : |
This season first photo.
I had a small comet in view from our balcony, 103P Hartley.
You see the comet as a very diffuse blob in center.
One of few comets we have visited so it's very special.
A 1:1 800x800 pixel crop around the comet.
It can be seen that the comet has moved relative the stars, about 40 pixels.
About one pixel per minute, that is the comet's relative speed.
Normally this movement is compensated for when stacking the sub images, or even better if the telescope track with the comets speed.
In this case no compensation has been done for this relative speed.
There are other interesting objects too, a galaxy, NGC 891 seen on the edge.
Have a look at the plate solved image, I used Astrometry to do it.
The bright star on the right side is a double star, GAM01 Andromeda in the constellation Andromeda or the extension of Pegasus.
It's a 2.1 magnitude star.
This is the the first test of the new Chrony sync of the clocks in Raspberry and KStars.
Even if I had the equipment on the balcony I used it without internet connection as if I was out on the field on the countryside.
Everything worked perfect, even the Polar align which I had so much problem with half a year ago. It's the GPS that handle correct time, date and coordinates.
|
| Date : | 2023-08-28 |
| Time (UT) : | 22:43 to 23:40 |
| Site : | Sweden, Stockholm, Hagsätra at balcony. Bortle class 9 |
| Comment : |
A 1:1 800x800 pixel crop from the main photo around the galaxy, NGC 891 seen on the edge.
It is also known as the Silver Sliver Galaxy, it hover there in the darkness above the comet.
It was discovered by William Herschel 1784.
It has the magnitude 10.8 and it is easy to see already in a small telescope.
The angle size of it is about 1/3 of the Moon. |
English
Credit: software 'Comet for Windows' from Seiichi Yoshida
(Click on the image to get one in high resolution in a new window)
