M 110 and V1 (Andromeda)

M 110 and V1 (Andromeda)

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Date/Site: 28. and 29. November 2016, AAR-observatory in Presberg
Exposure/
Filter:
R 7 x 300 seconds
G 9 x 300 seconds
B 9 x 300 seconds (-20°C)
Camera: QSI 632 with SBIG- and Baader-filters
off-axis-guiding with Lodestar
Optics/
Instrument:
10" f4-Newton on AP1200, RCC1 coma-corrector
Focusing with RoboFocus and FocusMax,
automatic image acquisition with CCD-Commander and MaximDL 6,
calibration: MaximDL 6, processing: PixInsight 1.8



The image contains two highlights: With the large Andromeda-galaxy as a backdrop M110 shows off its dark markings and several globular clusters.
Near the second (outer) band of dark nebulae in M31 V1, the famous Cepheid is located. Measuring this star's changes in brightness Edwin Hubble in 1923 determined the distance of M31 and proved that this nebula was not part of our galaxy but is a galaxy in it's own right.

M 110 with chart for identifying V1

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The AAVSO chart for V1 was used as an overlay to aid in identifying the legendary variable. The star looks quite blue to me.

© Friedhelm Hübner, last revision:  16.01.2017