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allan_dystrup- Nova
Det kan da – observationsmæssigt – vist kun blive bedre end det forgangne år…
Her min sidste observation fra 2015 — det blev ikke til så meget Deep sky i efteråret, men åbne stjernehobe kan man da næsten altid observere, selv under middelmådige forhold…
It’s a comfortable, mild (5°C/41°F) and dry december evening, 6 PM the day after Christmas. It has been windy with a blue(ish) sky and high drifting clouds; Now the wind is abating and the seeing is good and steady, — but the transparency is pretty lousy, with much skyglow due to high haze combined with a full moon on the rise in the east.
For the evenings project, I point my red dot at Ruchbah (delta Cassiopeia), high up in the SE at 81° altitude. Just E of delta CAS is a small triangle of 7m stars, and continuing from the NE corner of this triangle, ½° up towards epsilon CAS, I get M103 in the center of my 8×50 finder. Switching to my K40mm finder eyepiece, I can hold a field of 1.6° @ 27x (3mm exit pupil) in one view, from delta CAS via the small 7m star-triangle, to M103 and further up 15′ towards the NE, to a tiny triangle of 9m stars.
The M103 cluster has a diameter of only 6’, so to better frame the cluster, I click up the magnification to the 10mm ortho, yielding 108x @ 0.4° FOV (0.7mm XP); Due to the haze and sky glow, the faintest stars I can see are just above 11.5m, and so I can only identify around 15 members of the cluster. They form a nice wedge or fan shaped pattern, with the triple Ʃ131 (Struve) at the apex of the wedge. I can resolve it at 27x using averted vision into a wide pair of around 7m and 10m, with the faint B-component at roughly 135° PA. Changing to the FFC + O25 (166x), I confirm the A-B split, but am not able to identify the C component.
Allan_Dystrup 2016-01-01 14:31:49
astrojensen- Neutron star
Sjovt nok har jeg haft en af de bedste efterårssæsoner i mange år. Alligevel skål og godt nytår og ønske om en endnu bedre sæson i 2016!
Thomas, Bornholm
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