Exploration! 25 Settembre 2017

  • Refractor PrimaLuce  Airy ED90
  • Mount Skywatcher HEQ5 Pro Synscan
  • CCD Atik Titan
  • XP 90° 31,8mm dielectric mirror diagonal

Location: Seoul, South Korea

Open Cluster Cr405 (NGC6823)



Planetary Nebula M27 (NGC6853)




Atik Titan – Gain and Read Noise Analysis

This is an analysis of gain and read noise of the CCD Atik Titan.
I used as samples, two bias frame and two photos of M27 taken with 60 seconds of exposure, even though it should be done with flat frames, as said in my documentation, probably because they have a better signal to noise ratio.

Anyway the result are in line with the official website specification so I am more than satisfied.

Here you can download the sample images I used.

STD Mean Pixel Atik Titan Specification
Bias1 21,04 1235,00
Bias2 20,95 1235,00 FWC (e-) 22500,00
Flat1 468,87 11883,83 ADC (bit) 16,00
Flat2 492,62 11798,47 Readout Noise (e-) 7,00
  FWC (e-/ADU) 2,91
Mean (Bias1 + Bias2) 2470,00
Mean (Flat1 + Flat2) 23682,30
STD (flat1 – flat2) 419,72
STD (bias1 – bias2) 29,51
Gain (ADU) 0,12
Gain (e-/ADU) 0,35 Gain Factor (e-/ADU) 0,34
Read Noise 2,53 Readout Noise (ADU) 2,40



2012 DA14 – tracking with binocular

Really beautiful day was on February 15th, 2013.
I got up at 3 am and with my binocular 20×80 and tripod I went to a schoolyard near my home. I got ready for the event until 4 am, when finally I caught the little dot.

I started with star hopping from Minkar, Epsilon Corvi, and I went down until Xi Hydrae, where at 4 am I would have seen the asteroid.
The problem was that the altitude was really low, just 15 degree and a high building would have screwed up my day, so I decided to go up a little more until the building would not have been a problem.

It wasn’t really easy because the seen in Seoul, South Korea, is REALLY BAD! anyway, no moon, sky really clear from clouds, so was kind of perfect day. So I was able to put my view between Gamma and Beta Crateris, and at 4 hour and 18 minutes I saw this little dot of mag. +7.9 running really fast on the field of my binocular.

Really Exciting! I followed the asteroid for an hour, and was really a beautiful night. At around 4:40 it passed by a beautiful and rich field of stars between Crater, Virgo, Leo and Sextans constellation, and at 5 o’clock it passed by a rich field of faint NGC galaxies that unfortunately I was unable to see.

For the accurate position of the asteroid I used SkySafari Plus on my Ipod, where I was able to see in real time the exact position with a small error in Right Ascension but totally permissible.
However I wasn’t able to use my pc software, Cartes Du Ciel, to track the path of the asteroid, where on the contrary the ephemerides were totally wrong.

UCAC4 482-078944 – high proper motion

The first image is from the US Naval Observatory’s archive, the second is a composition of three images of 20 second each, with a Newton Ziel Galazy2 8′ with SBIG ST-247 camera at f/5.

The star has a proper motion in RA of -1.15″ per year, really fast!

UCAC4 482-078944

Go to VizieR reference page
Go to Simbad reference page
Download source

This research has made use of the USNOFS Image and Catalogue Archive
operated by the United States Naval Observatory, Flagstaff Station