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Ursa Astronomical Association

136199 Eris - 15.1.2021 at 22.00 Fregenal de la Sierra, Espanja Observation number 95539

Visibility I / V

Tapio Lahtinen, Tampereen Ursa

5 years ago, I photographed the Makemake dwarf planet from my home balcony.
When these domestic climates have been extremely bad again, I decided to try to see if it could get an object about 2 magnitudes dimmer than described with half the optics.
Yes, as long as you shine enough.
With a 10 minute exposure, the subject was barely visible but the other night I stacked 10 10 minute exposures and showed a little better.
The images taken every 2 hours did not show the movement of the dwarf planet but required a day difference.

Another image is a slightly rugged animation where the movement stands out.

I measured the brightness of the dwarf planet with the ASTAP program on 18.8.
This is not the object I photographed dimly , but the quasar i I photographed in 2018, whose brightness was mag 19.08, gets its honor.

Additional information
  • Observation target
    • Dwarf planet
  • Name of the observation target
    • 136199 Eris
    • Erittäin heikosti näkyvä
Technical information

Sky-Watcher Esprit 100ED, 10 Micron GM 1000 HPS, Atik 460EX, 10x10m L

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