Contact information

Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Starry sky image - 8.9.2020 at 00.12 - 8.9.2020 at 00.45 Hyvinkää Observation number 93547

Visibility III / V

Timo Inkinen, Ursa (Etelä-Suomi)

I practiced shooting double stars again and the target was Iota Cassiopeiae for gear. The problem with these is always how to present the image, as well as the often very close partners of the two stars and, on the other hand, the immediate surroundings of that star. I’ve explored that dilemma from different angles and this time here’s a color LRGB version of my multiple star on my home page. As an example of previous filming attempts e.g. Delta Cygni and Castor Kuvani. Exercises continue ...

Iota Cassiopeiae is characterized by stars of magnitude 4.65 / 6.9 / 8.7, spaced AB between 2.7 "and AC between 8.7". So clear telescope targets and I used 2x PowerMate for this image, with which I doubled the focal length of the TMB 152/1200 lens tube to 2400mm. Finally, a few more visual observations of this object from around the world and basic information about the object:

https://www.cloudynights.com/topic/719464-iota-cas-in-small-refractors/?p=10370753

http://www.deepskywatch.com/Astrosketches/doubles/Iota-Cassiopea-sketch.html

https://theskylive.com/sky/stars/iota-cassiopeiae-star



More similar observations
Additional information
  • Observation target
    • Starry sky image
    • Keskitaso
  • Constellation
    • Cassiopeia
Technical information

The background sky was captured as an LRGB image in 30s chunks (300: 180: 180: 180) with a total exposure of 14 min. I didn’t stretch that constellation in PixInsight this time in any way very “open” to get that looser pair of stars still properly visible. The thumbnail embedded in the corner of the image area uses SharpCap video with 0.25s exposures, from which I stacked a black and white image with additional information. Thus, both images are captured through the ZWO ASI183MM Pro and the TMB 152/1200 lens tube.

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